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Oil maturity assessment using maturity indicators based on methylated dibenzothiophenes 被引量:15
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作者 Li Meijun Wang T.-G +2 位作者 Shi Shengbao Zhu Lei Fang Ronghui 《Petroleum Science》 SCIE CAS CSCD 2014年第2期234-246,共13页
Aromatic fractions of 140 oils and condensates that originated from different types of source rocks (marine shale,terrestrial shale and marine carbonate) were analyzed using gas chromatographymass spectrometry (GC... Aromatic fractions of 140 oils and condensates that originated from different types of source rocks (marine shale,terrestrial shale and marine carbonate) were analyzed using gas chromatographymass spectrometry (GC-MS) to investigate the relative distributions of methylated dibenzothiophenes with respect to thermal maturity.The positions of methyl groups of trimethyldibenzothiophene isomers (TMDBTs) including those used in the definition of maturity indicator TMDBT index in previous studies were firmly identified by co-elution of internal standards in GC-MS analysis and by comparing with reported retention indices.A new maturity ratio related to dimethyldibenzothiophenes (DMDBTs) is proposed on the basis of the differences in thermodynamic stability among different DMDBT isomers.Another maturity index (TMDBT-I2) based on TMDBTs is also suggested on the basis of our empirical observations and presumed thermodynamic stability of TMDBT isomers.These two newly proposed (2,6 + 3,6)-/1,4-DMDBT ratio and TMDBT-I2 correlate well with MDR (4-/1-methyldibenzothiophene)and 2,4-/1,4-DMDBT ratios,suggesting their common chemical reaction mechanisms and similar behavior with increasing maturity.Therefore,they can be effectively applied for maturity assessments.Furthermore,the TMDBTs related maturity parameters are more reliable for over-mature oils and condensates due to the relatively higher concentrations of thermodynamically unstable TMDBT isomers,i.e.1,4,6-,1,4,8-and 3,4,6-TMDBT in this study than those of 1-methyldibenzothiophene (1-MDBT) or 1,4-DMDBT.In contrast with 4,6-/1,4-DMDBT,the newly proposed (2,6 + 3,6)-/1,4-DMDBT ratios for oils that originated from different types of source rocks have approximately same relationship with the oil maturity (Rc %).This suggests that the lithology and organic facies may have relatively less influence on (2,6 + 3,6)-/1,4-DMDBT ratio compared to 4,6-/1,4-DMDBT.The maturity parameters based on methylated dibenzothiophenes are particularly useful in the maturity assessments of post-and over-mature oils and condensates and can complement maturity indicators based on steranes and terpanes. 展开更多
关键词 dibenzothiophenE maturity indicator molecular thermodynamic stability sedimentaryorganic matter
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Thermodynamic Properties for Polybrominated Dibenzothiophenes by Density Functional Theory 被引量:2
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作者 李加友 柳红霞 +2 位作者 于红霞 王遵尧 王连生 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2009年第6期999-1008,共10页
The thermodynamic properties of 135 polybrominated dibenzothiophenes (PBDTs) in the gaseous state at 298.15 K and 1.013×10^5 Pa, are calculated using the density functional theory (the B3LYP/6-311G^**) wit... The thermodynamic properties of 135 polybrominated dibenzothiophenes (PBDTs) in the gaseous state at 298.15 K and 1.013×10^5 Pa, are calculated using the density functional theory (the B3LYP/6-311G^**) with Gaussian 03. Based on these data, the isodesmic reacflons are designed to calculate the standard enthalpy of formation (△fH^θ) and the standard Gibbs energy of formation (△fG^θ) of PBDTs. The relations of these thermodynamic parameters with the number and positionof bromine subsfituents (NPBS) are discussed, and it is found that there exist good correlations between othermody namic parameters (including heat capacity at constant volume, entropy, enthaipy, free energy, △fH^θ, △fG^θ) and NPBS. Thoe relative stability order of PBDT congeners is proposed theoretically based on the relative magnitude of their △fG^θ. In addition, the values of molar heat capacities at constant pressure (Cp,m) for PBDT c ongelaers are calculated. 展开更多
关键词 polybrominated dibenzothiophenes density functional theory method of position of substituted Br atom thermodynamic parameters relative stability
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Quantitative Structure-chromatographic Retention Relationship for Polychlorinated Dibenzothiophenes and Their Corresponding Sulfones
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作者 ZHU Jian-Qing WANG Wei +2 位作者 XU Hui-Ying XU Xiao-Lu ZOU Jian-Wei 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2019年第11期1835-1844,共10页
Polychlorinated dibenzothiophenes(PCDTs)and their corresponding sulfone(PCDTO2)compounds are a group of important persistent organic pollutants.In the present study,geometrical optimization and subsequent calculat... Polychlorinated dibenzothiophenes(PCDTs)and their corresponding sulfone(PCDTO2)compounds are a group of important persistent organic pollutants.In the present study,geometrical optimization and subsequent calculations of electrostatic potentials(ESPs)on molecular surface have been performed for all 135 PCDTs and 135 PCDTO2 congeners at the HF/6-31G*level of theory.A number of statistically-based parameters have been extracted.Linear relationship between gas-chromatographic retention index(RI)and the structural descriptors have been established by multiple linear regression.The result shows that two descriptors derived from positive electrostatic potential on molecular surface, ■ and π,together with the molecular volume(Vmc)and the energy of the lowest unoccupied molecular orbital(ELUMO)can be well used to express the quantitative structure-retention relationship(QSRR)of PCDTs and PCDTO2.Predictive capability of the two models has been demonstrated by leave-one-out cross-validation with the cross-validated correlation coefficient(RCV)of 0.996 and 0.997,respectively.Furthermore,the predictive power of the models is further examined for the external test set.Correlation coefficients(R)between the observed and predicted RI values for the external test set are 0.997 and0.998,respectively,validating the robustness and good prediction of our model.The QSRR model established may provide again a powerful method for predicting chromatographic properties of aromatic organosulfur compounds. 展开更多
关键词 POLYCHLORINATED dibenzothiophene(PCDTs) polychlorodibenzothiophene sulfone(PCDTO2) molecular electrostatic potential(ESP) quantitative structure-retention relationship(QSRR)
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A comparison of the distributions of carbazoles and dibenzothiophenes in western Qaidam Basin, Northwest China
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作者 GUAN Mingming ZHANG Chunming 《Chinese Journal Of Geochemistry》 EI CAS CSCD 2014年第2期194-200,共7页
Variations in the distributions of carbazoles and dibenzothiophenes were investigated in a set of source rocks, which differ mainly in their maturity levels during immature-mature stages. A comparison of the distribut... Variations in the distributions of carbazoles and dibenzothiophenes were investigated in a set of source rocks, which differ mainly in their maturity levels during immature-mature stages. A comparison of the distributions of carbazoles and dibenzothiophenes has revealed the main results as follows: variations in the relative amounts ①of C0-, C1-, C2-dibenzothiophenes show a low correlation with that of the corresponding carbazoles, with the former's being much higher than the latter's; variations in the relative amounts of methyldibe② nzothiophene isomers also display a low correlation with that of the corresponding methylcarbazoles, with 4-/4- +1-methyldibenzothiophene ratio ranging from 0.52 to 0.96, while the corresponding carbazole ratio of 1-/1- +4-methylcarbazole only being 0.71±0.05; the mat③ urity parameter for 4,6-/4,6- +1,4-dimethyldibenzothiohene, ranging from 0.34 to 0.75, shows a remarkable linear correlation with the corresponding ratio of 1,8-/1,8- +1,4-dimethylcarbazole(R2>0.84). The un-correlation may indicate some different geological-geochemical fates for some isomers of dibenzothiophenes and carbazoles. The high correlation may reveal a strong maturation dependence on the dimethylcarbazole distributions, indicating that attention should be paid when 1,8-/1,8- +1,4-dimethylcarbazole is used as a petroleum migration indicator. 展开更多
关键词 二苯并噻吩 中国西北地区 柴达木盆地 咔唑 西部地区 成熟度参数 比值范围 线性相关性
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Optimization of dendritic TS-1/Silica micro–mesoporous composites for efficient hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene
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作者 Cheng-Kun Xiao Yu-Tong Zou +6 位作者 Dong-Ze Li En-Hua Wang Ao-Cheng Wang Dao-Wei Gao Ai-Jun Duan Peng Zheng Xi-Long Wang 《Petroleum Science》 SCIE EI CAS CSCD 2023年第4期2521-2530,共10页
A novel composite material(TD)composed of TS-1 microcrystalline and dendritic mesoporous silica nanospheres(DMSNs)was successfully prepared.The TD composite material had open pore structure and large specific surface ... A novel composite material(TD)composed of TS-1 microcrystalline and dendritic mesoporous silica nanospheres(DMSNs)was successfully prepared.The TD composite material had open pore structure and large specific surface area,which was conducive to the mass transfer of reactants and products.The Ti element in TS-1 could be used as an electron assistant,and the spillover d-electrons were conducive to the improvement of the sulfidation and dispersion of MoS_(2),thereby forming more type II MoS_(2) active phases.The incorporation of Ti could bring more Brønsted(B)and Lewis(L)acid,which was conducive to the hydrogenation pathway(HYD)selectivity(41.2%)of dibenzothiophene(DBT)hydrodesulfurization(HDS)and isomerization(ISO)route selectivity(21.9%)of 4,6-dimethyldibenzothiophene(4,6-DMDBT)HDS,thus improve the HDS activity of DBT and 4,6-DMDBT.NiMo/TD-70(Aging temperature=70℃)had the best HDS activities of DBT(99.0%)and 4,6-DMDBT(93.7%)due to its large open pore structure,good acidity,suitable metal-support interaction(MSI)and perfect dispersion of the metallic active sites. 展开更多
关键词 Dendritic TS-1-DMSNs composites NiMo/TD catalysts dibenzothiophene4 6-Dimethyldibenzothiophene HYDRODESULFURIZATION
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基于蒽核深蓝光材料的合成及电致发光性能
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作者 张越华 邢龙江 +7 位作者 聂飞 陈文铖 穆英啸 彭少洪 何念 孙宇曦 曾庆明 霍延平 《发光学报》 EI CAS CSCD 北大核心 2024年第2期269-279,共11页
以蒽作为三线态‐三线态湮灭(TTA)型蓝光材料的基元,通过在蒽的9和10位分别引入弱给电子基团二苯并噻吩和弱吸电子基团苯氰,设计合成了两个给体‐受体型深蓝光TTA材料4‐(10‐(二苯并[b,d]噻吩‐4‐基)蒽‐9‐基)苯腈(2)和4‐(10‐(二苯... 以蒽作为三线态‐三线态湮灭(TTA)型蓝光材料的基元,通过在蒽的9和10位分别引入弱给电子基团二苯并噻吩和弱吸电子基团苯氰,设计合成了两个给体‐受体型深蓝光TTA材料4‐(10‐(二苯并[b,d]噻吩‐4‐基)蒽‐9‐基)苯腈(2)和4‐(10‐(二苯并[b,d]噻吩‐2‐基)蒽‐9‐基)苯腈(3),并对它们的热稳定性、电化学性质、光物理性质及电致发光性质进行了系统表征。在纯膜状态下,两个化合物的光致发光峰分别位于445 nm和451 nm处,光致发光量子产率分别为40.2%和57.9%。基于化合物2和3的非掺杂器件的电致发光峰分别位于448 nm和458 nm处,实现了深蓝光发射。两个器件获得了较好的发光效率,其最大电流效率分别为4.2 cd·A^(-1)和6.9 cd·A^(-1),最大功率效率分别为2.3 lm·W^(-1)和3.6 lm·W^(-1),最大外量子效率分别为3.8%和5.6%。即使在1 000 cd·m^(-2)亮度下,两个器件的外量子效率依然保持在3.7%和5.4%,表现出极低的效率滚降。 展开更多
关键词 二苯并噻吩 苯氰 深蓝光TTA材料
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Al_(2)O_(3)基材作载体制备MoP加氢脱硫催化剂的研究
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作者 邹洁 李翔 +2 位作者 盛强 尚森森 王伟 《现代化工》 CAS CSCD 北大核心 2024年第6期101-106,共6页
采用低温燃烧法和溶剂热法分别合成了富含五配位Al^(3+)物种的氧化铈改性Al_(2)O_(3)(Ce-Al_(2)O_(3))和介孔-大孔Al_(2)O_(3)(M-Al_(2)O_(3));通过程序升温还原浸渍法负载的Mo的磷酸盐前驱体制备了MoP催化剂。以二苯并噻吩(DBT)为模型... 采用低温燃烧法和溶剂热法分别合成了富含五配位Al^(3+)物种的氧化铈改性Al_(2)O_(3)(Ce-Al_(2)O_(3))和介孔-大孔Al_(2)O_(3)(M-Al_(2)O_(3));通过程序升温还原浸渍法负载的Mo的磷酸盐前驱体制备了MoP催化剂。以二苯并噻吩(DBT)为模型含硫化合物评价了其加氢脱硫(HDS)性能。结果表明,M-Al_(2)O_(3)上制备纯相MoP所需磷酸盐前驱体的P/Mo摩尔比在1~1.2之间。DBT在MoP催化剂上转化率大小为MoP(1)/SiO_(2)>MoP(1)/Ce-Al_(2)O_(3)>MoP(1.2)/M-Al_(2)O_(3)。动力学研究表明,DBT在MoP(1)/Ce-Al_(2)O_(3)和MoP(1.2)/M-Al_(2)O_(3)上的HDS反应活化能几乎相同,显著小于MoP(1)/SiO_(2)上的活化能。在MoP催化剂上,直接脱硫(DDS)路径选择性随温度的增加而增加。在较低的温度下(如280℃),DBT主要通过加氢(HYD)反应路径脱硫;在较高的温度下(如360℃),DDS和HYD两条反应路径并重。 展开更多
关键词 MOP 磷酸盐前驱体 程序升温还原 Al_(2)O_(3) 加氢脱硫 二苯并噻吩
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Fe基催化剂的酸性调控及其对加氢脱硫反应路径选择性的影响 被引量:1
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作者 李国省 李昆鸿 +6 位作者 李晓涵 尹馨蕊 邵嘉欣 郭荣 任申勇 郭巧霞 申宝剑 《燃料化学学报(中英文)》 EI CAS CSCD 北大核心 2024年第2期234-248,共15页
以Fe作为主活性金属、Zn作为助活性金属,制备了Y型分子筛改性的Fe基加氢脱硫(HDS)催化剂。采用低温氮气物理吸附、X射线衍射(XRD)、氢气程序升温还原(H_(2)-TPR)、氨气程序升温脱附(NH_(3)-TPD)、扫描电子显微镜(SEM)、X射线光电子能谱(... 以Fe作为主活性金属、Zn作为助活性金属,制备了Y型分子筛改性的Fe基加氢脱硫(HDS)催化剂。采用低温氮气物理吸附、X射线衍射(XRD)、氢气程序升温还原(H_(2)-TPR)、氨气程序升温脱附(NH_(3)-TPD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和吡啶红外(Py-IR)等表征方法对改性前后Fe基催化剂的形貌、孔结构、分散性、还原性、电子缺陷结构以及酸性等变化进行了研究,并使用固定床反应器对Fe基催化剂的HDS性能进行了评价。结果表明,Y型分子筛的引入提供了Bronsted(B)酸中心,使得Fe基催化剂的脱硫率提高了10.7%-34.1%。同时,B酸中心提高了催化剂的直接脱硫(DDS)反应路径的选择性。此外,B酸中心在促进DDS反应路径选择性增加的同时,抑制了预加氢脱硫(HYD)反应路径中四氢二苯并噻吩(THDBT)和六氢二苯并噻吩(HHDBT)更进一步的深度加氢,从而在保证脱硫率提升的同时又降低了氢耗。其根本原因可能是Y型分子筛的引入增强了催化剂的酸性,特别是B酸中心和活性金属之间的相互作用促进了电子转移,从而调节了Fe物种的电子缺陷结构,进而提升了催化剂的HDS性能。 展开更多
关键词 Fe基催化剂 酸性 Y型分子筛 电子缺陷结构 加氢脱硫 二苯并噻吩
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Preparation of highly dispersed desulfurization catalysts and their catalytic performance in hydrodesulfurization of dibenzothiophene 被引量:22
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作者 郝靓 熊光 +3 位作者 刘丽萍 龙化云 靳凤英 王祥生 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第3期412-419,共8页
Micro-mesoporous ZK-1 molecular sieves with different Si/Al ratios were used as supports for binary Co-Mo hydrodesulfurization(HDS) catalysts.The CoMo/ZK-1 catalysts were prepared using an over-loading impregnation ... Micro-mesoporous ZK-1 molecular sieves with different Si/Al ratios were used as supports for binary Co-Mo hydrodesulfurization(HDS) catalysts.The CoMo/ZK-1 catalysts were prepared using an over-loading impregnation method,and characterized using N2 physisorption,X-ray diffraction,temperature-programmed NH3 desorption,temperature-programmed reduction(TPR),ultraviolet-visible diffuse reflectance spectroscopy,and high-resolution transmission electron microscopy(HRTEM).The results show that the CoMo/ZK-1 catalysts have high surface areas(~700 m^2/g),large pore volumes,and hierarchical porous structures,which promote the dispersion of Co and Mo oxide phases on the ZK-1 supports.The TPR results show that the interactions between the Co and Mo oxide phases and the ZK-1 support are weaker than those in the CoMo/γ-Al2O3 catalyst.The HRTEM results show that the CoMo/ZK-1 catalysts have better MoS2 dispersion and more active edge sites.The catalysts were tested in HDS of dibenzothiophene.Under mild reaction conditions,the activity of Co and Mo sulfides supported on ZK-1 was higher than those of Co and Mo sulfides supported on ZSM-5,A1KIT-1,and γ-Al2O3. 展开更多
关键词 Micro-mesoporous molecular sieve ZK-1 HYDRODESULFURIZATION dibenzothiophenE
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光催化二苯并噻吩的Thia-Baeyer-Villiger氧化重排反应
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作者 胡晓芳 张建刚 +1 位作者 赵晋忠 马小锋 《合成化学》 CAS 2024年第10期881-886,共6页
二苯并噻吩(DBT)是石油深度脱硫过程中最顽固的成分。随着可持续发展的推广,急需经济绿色的方法实现DBT的脱硫过程。以金属卟啉络合物为催化剂,绿色、廉价的H_(2)O_(2)为氧化剂,发展了光催化的二苯并噻吩的Thia-Baeyer-Villiger氧化重... 二苯并噻吩(DBT)是石油深度脱硫过程中最顽固的成分。随着可持续发展的推广,急需经济绿色的方法实现DBT的脱硫过程。以金属卟啉络合物为催化剂,绿色、廉价的H_(2)O_(2)为氧化剂,发展了光催化的二苯并噻吩的Thia-Baeyer-Villiger氧化重排反应,顺利地将二苯并噻吩以83.6%的收率转化为二苯并亚磺酰内酯(BPS)。所形成的BPS在碱性条件下加热,脱除SO_(2),可以68%的收率形成2-羟基联苯(2-HBP)。该方法成功模拟了生物催化脱硫过程。 展开更多
关键词 二苯并噻吩 拜耳-维立格氧化 光催化 卟啉 脱硫
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Few-layered hexagonal boron nitride nanosheets stabilized Pt NPs for oxidation promoted adsorptive desulfurization of fuel oil
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作者 Peiwen Wu Xin Song +9 位作者 Linlin Chen Lianwen He Yingcheng Wu Duanjian Tao Jing He Chang Deng Linjie Lu Yanhong Chao Mingqing Hua Wenshuai Zhu 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第3期495-506,共12页
A few-layered hexagonal boron nitride nanosheets stabilized platinum nanoparticles(Pt/h-BNNS)is engineered for oxidation-promoted adsorptive desulfurization(OPADS)of fuel oil.It was found that the few-layered structur... A few-layered hexagonal boron nitride nanosheets stabilized platinum nanoparticles(Pt/h-BNNS)is engineered for oxidation-promoted adsorptive desulfurization(OPADS)of fuel oil.It was found that the few-layered structure and the defective sites of h-BNNS not only are beneficial to the stabilization of Pt NPs but also favor the adsorption of aromatic sulfides.By employing Pt/h-BNNS with a Pt loading amount of 1.19 wt%as the active adsorbent and air as an oxidant,a 98.0%sulfur removal over dibenzothiophene(DBT)is achieved along with a total conversion of the DBT to the corresponding sulfones(DBTO_(2)).Detailed experiments show that the excellent desulfurization activity originates from the few-layered structure of h-BNNS and the high catalytic activity of Pt NPs.In addition,the OPADS system with Pt/h-BNNS as the active adsorbent shows remarkable stability in desulfurization performance with the existence of different interferents such as olefin,and aromatic hydrocarbons.Besides,the Pt/h-BNNS can be recycled 12 times without a significant decrease in desulfurization performance.Also,a process flow diagram is proposed for deep desulfurization of fuel oil and recovery of high value-added products,which would promote the industrial application of such OPADS strategy. 展开更多
关键词 DESULFURIZATION Adsorption Catalytic oxidation Active adsorbent dibenzothiophenE
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Photocatalytic Oxidative Desulfurization of Dibenzothiophene on TiO2 Modified Bimodal Mesoporous Silica 被引量:7
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作者 Xu Meizhen Yang Lina Li Jian 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2017年第3期59-67,共9页
By using the bimodal mesoporous silica(BMMS) as the carrier and butyl titanate as the titanium source, the TiO_2/BMMS catalyst was prepared. The samples were characterized by XRD, XRF, N_2 adsorption and desorption, F... By using the bimodal mesoporous silica(BMMS) as the carrier and butyl titanate as the titanium source, the TiO_2/BMMS catalyst was prepared. The samples were characterized by XRD, XRF, N_2 adsorption and desorption, FTIR, UVvis,SEM, EDS, and TEM techniques. The test results showed that TiO_2 was amorphous, the TiO_2/BMMS catalyst had an ordered bimodal mesoporous structure, and the chemical interaction existed between BMMS and TiO_2. Since the TiO_2/BMMS had a lower band gap, its photocatalytic activity was better than TiO_2. Under UV irradiation a one-pot PODS system was set up, using TiO_2/BMMS as the catalyst, H_2O_2 as the oxidant, and methanol as the solvent. The TiO_2/BMMS catalyst showed better photocatalytic activity than the mono-modal mesoporous TiO_2/SBA-15 catalyst, and the desulfurization rate of dibenzothiophene(DBT) over TiO_2/BMMS catalyst could reach 99._2%. The TiO_2/BMMS catalyst also had so good stability that the desulfurization rate of DBT did not drop apparently after 8 cycles of reusing, and could still be close to 90%. 展开更多
关键词 BIMODAL MESOPOROUS silica amorphous TIO2 PHOTOCATALYTIC activity UV irradiation dibenzothiophenE
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Desulfurization of dibenzothiophene by a newly isolated Corynebacterium sp. ZD-1 in aqueous phase 被引量:4
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作者 WANGMiao-dong LIWei WANGDa-hui SHIYao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2004年第6期1011-1015,共5页
Sulfur emission through fuel combustion is a global problem because it is a major cause of acid rain. Crud oil contains many heterocyclic organic sulfur compounds, among which dibenzothiophene(DBT) and DBTs bearing al... Sulfur emission through fuel combustion is a global problem because it is a major cause of acid rain. Crud oil contains many heterocyclic organic sulfur compounds, among which dibenzothiophene(DBT) and DBTs bearing alkyl substitutions usually are representative compounds. A strain was isolated from refinery sludge and identified as Corynebacterium ZD-1. The behavior of DBT degradation by ZD-1 in aqueous phase was investigated. Corynebacterium ZD-1 could metabolize DBT to 2-hydroxybiphenyl(2-HBP) as the dead-end metabolite through a sulfur-specific pathway. In shake flask culture, ZD-1 had its maximal desulfurization activity in the late exponential growth phase and the specific production rate of 2-HBP was about 0.14(mmol·kg dry cell -1·min -1, mmol·KDC -1·min -1). Active resting cells for desulfurization should be prepared only in this period. 2-HBP inhibited the growth of strain ZD-1, the production of DBT degradation enzymes, and the activity of enzymes. Sulfate inhibited the production of dibenzothiophene(DBT) degradation enzymes but had no effect on the enzymes' activity. The production rates of 2-HBP at lower cell densities were higher and the maximum amount conversion of DBT to 2-HBP(0.067 mmol/L) after 8 h was gained at 9.2 g dry cell/L rather higher cell density. The results indicated that this newly isolated strain could be a promising biocatalyst for DBT desulfurization. 展开更多
关键词 BIODESULFURIZATION dibenzothiophenE Corynebacterium
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Effects of nicotinamide and riboflavin on the biodesulfurization activity of dibenzothiophene by Rhodococcus erythropolis USTB-03 被引量:4
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作者 YAN Hai SUN Xudong +3 位作者 XU Qianqian MA Zhao XIAO Chengbin Ning Jun 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第5期613-618,共6页
Rhodococcus erythropolis USTB-03 is a promising bacterial strain for the biodesulfurization of dibenzothiophene (DBT) via a sulfurspecific pathway in which DBT is converted to 2-hydroxybiphenyl (2HBP) as an end pr... Rhodococcus erythropolis USTB-03 is a promising bacterial strain for the biodesulfurization of dibenzothiophene (DBT) via a sulfurspecific pathway in which DBT is converted to 2-hydroxybiphenyl (2HBP) as an end product. The effects of nicotinamide and riboflavin on the sulfur specific activity (SA) of DBT biodesulfurization by R. erythropolis USTB-03 were investigated. Both nicotinamide and riboflavin were found to enhance the expression of SA, which was not previously reported. When R. erythropolis USTB-03 was grown on a medium containing nicotinamide of 10.0 mmol or riboflavin of 50.0 μmol, SA was raised from 68.0 or so to more than 130 mmol 2HBP/(kg dry cells.h). When R. erythropolis USTB-03 was grown in the presence of both nicotinamide of 5.0 mmol and riboflavin of 25.0 μmol, SA was further increased to 159.0 mmol 2HBP/(kg dry cells.h). It is suggested that the biological synthesis of reduced form of flavin mononucleotide (FMNH2), an essential coenzyme for the activities of biodesulfurization enzyme Dsz C and A, might be enhanced by nicotinamide and riboflavin, which was responsible for the increased SA of R. erythropolis USTB-03. 展开更多
关键词 BIODESULFURIZATION dibenzothiophenE NICOTINAMIDE Rhodococcus erythropolis USTB-03 RIBOFLAVIN
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Optimization for Microbial Degradation of Dibenzothiophene by Pseudomonas sp. LKY-5 Using Response Surface Methodology 被引量:5
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作者 Li Lin Zhao Chaocheng +3 位作者 Liu Qiyou Zhang Yunbo Liu Chunshuang Xue Jianliang 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2014年第1期19-26,共8页
In this research, the degradation of dibenzothiophene(DBT) was investigated by using Pseudomonas sp. LKY-5 isolated from oil contaminated soil. The response surface methodology(RSM) based on the Box-Behnken design(BBD... In this research, the degradation of dibenzothiophene(DBT) was investigated by using Pseudomonas sp. LKY-5 isolated from oil contaminated soil. The response surface methodology(RSM) based on the Box-Behnken design(BBD) was applied for evaluating the interactive effects of four independent variables including substrate concentration, temperature, pH and agitation rate on the DBT removal response. A total of 29 experiments for four factors at three levels were conducted in present study. A second-order regression model was then developed, and the analysis of variance(ANOVA) illustrated that the proposed quadratic model could be utilized to navigate the design space. The value of determination coefficient(R2=0.953 4) indicated a satisfactory agreement between the quadratic model and the experimental data. It was found that DBT removal was more significantly affected(P<0.000 1) by substrate concentration compared with other three parameters. An 100% degradation of DBT could be obtained by Pseudomonas sp. LKY-5 at a substrate concentration of 100 mg/L. 展开更多
关键词 DEGRADATION dibenzothiophenE Pseudomonas sp. response surface methodology Box–Behnken design
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Amorphous TiO_2-supported Keggin-type ionic liquid catalyst catalytic oxidation of dibenzothiophene in diesel 被引量:3
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作者 Zhendong Yu Donghui Wang +6 位作者 Suhang Xun Minqiang He Ruliang Ma Wei Jiang Hongping Li Wenshuai Zhu Huaming Li 《Petroleum Science》 SCIE CAS CSCD 2018年第4期870-881,共12页
Supported ionic liquid(IL) catalysts [Cmim]PMoO/Am TiO(amorphous TiO) were synthesized through a one-step method for extraction coupled catalytic oxidative desulfurization(ECODS) system. Characterizations such as FTIR... Supported ionic liquid(IL) catalysts [Cmim]PMoO/Am TiO(amorphous TiO) were synthesized through a one-step method for extraction coupled catalytic oxidative desulfurization(ECODS) system. Characterizations such as FTIR, DRS,wide-angle XRD, Nadsorption–desorption and XPS were applied to analyze the morphology and Keggin structure of the catalysts. In ECODS with hydrogen peroxide as the oxidant, it was found that ILs with longer alkyl chains in the cationic moiety had a better effect on the removal of dibenzothiophene. The desulfurization could reach 100% under optimal conditions, and GC–MS analysis was employed to detect the oxidized product after the reaction. Factors affecting the desulfurization efficiencies were discussed, and a possible mechanism was proposed. In addition, cyclic experiments were also conducted to investigate the recyclability of the supported catalyst. The catalytic activity of [Cmim]PMoO/Am TiOonly dropped from 100% to 92.9% after ten cycles, demonstrating the good recycling performance of the catalyst and its potential industrial application. 展开更多
关键词 Supported ionic liquid catalyst POLYOXOMETALLATE Oxidative desulfurization Amorphous TiO_2 dibenzothiophenE
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Solvothermal Synthesis of V_2O_3 Catalysts for Oxidative Desulfurization of Dibenzothiophene 被引量:6
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作者 Liu Ni Zhang Minghui Wang Danhong 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2014年第3期26-32,共7页
V2O3 nanoparticles with high surface area have been successfully prepared by a new solvothermal method without using any surfactant and template. The size of V2O3 nanoparticles is mostly equal to 10 nm-30 nm. The high... V2O3 nanoparticles with high surface area have been successfully prepared by a new solvothermal method without using any surfactant and template. The size of V2O3 nanoparticles is mostly equal to 10 nm-30 nm. The highest surface area of obtained V2O3 nanoparticles reaches 49 m2/g. Several kinds of V2O3 catalysts were prepared by different methods. All these V2O3 catalysts obtained thereby showed high catalytic activity for oxidative desulfurization(ODS) reaction by using tert-butyl hydroperoxide as the oxidant. The V2O3 catalyst with a highest ODS activity was obtained under the following conditions: The catalyst was prepared upon using V2O5 as the vanadium source, methanol as the solvent, and oxalic acid as the complexing reagent at a V2O5/oxalic acid molar ratio of 1:2. The process for ODS of dibenzothiophene was carried out under mild conditions(under atmospheric pressure and at a relatively low temperature). The highest ODS activity of the obtained V2O3 nanoparticles can be attributed to their highest surface area. 展开更多
关键词 vanadium sesquioxide NANOPARTICLES oxidative desulfurization SOLVOTHERMAL dibenzothiophenE
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Study of Dibenzothiophene Adsorption Over Carbon Nanotube Supported CoMo HDS Catalysts 被引量:1
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作者 HaiyangChen XichenZhou +3 位作者 HongyanShang ChenguangLiu JieshanQiu FeiWei 《Journal of Natural Gas Chemistry》 CAS CSCD 2004年第4期209-217,共9页
Adsorption properties of dibenzothiophene (DBT) on a CNT (carbon nanotube) support as well as on CoMoS/CNT and CoMoO/CNT catalysts have been studied. Consecutive desorption of adsorbates was measured by TGA. The commo... Adsorption properties of dibenzothiophene (DBT) on a CNT (carbon nanotube) support as well as on CoMoS/CNT and CoMoO/CNT catalysts have been studied. Consecutive desorption of adsorbates was measured by TGA. The commonly used carriers AC (activated carbon), γ-Al_2O_3, and their supported catalysts (CoMoO/AC, CoMoS/AC, CoMoO/γ-Al_2O_3, CoMoS/γ-Al_2O_3)were also subjected to analysis for comparison. The acidic properties of the samples were characterized using the NH_3-TPD technique. Correlation between the adsorption of DBT and the acidic properties of the catalysts has been established. It was found that the Co-Mo catalysts in the sulfide state adsorbed much more DBT molecules than the corresponding Co-Mo catalysts in the oxide state. The CoMoS/CNT catalyst exhibited very high HDS activity and selectivity, as compared with the CoMoS/γ-Al)_2O_3 catalysts. Based on the BET data and the high hydrogenolysis/hydrogenation selectivity of the CoMoS/CNT, it was deduced that more than 90% of the DBT molecules adsorbed on the CoMoS/CNT with an end-on mode, and the surface of the CoMoS/CNT catalyst was almost fully covered with DBT molecules. Although the AC support had very high surface area and high loading ability, the AC supported CoMoS catalyst showed lower HDS activity, as compared with the CoMoS/γ-Al_2O_3 catalyst. 展开更多
关键词 carbon nanotubes adsorption properties dibenzothiophenE hydrodesufurtzation network
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Oxidation of Dibenzothiophene in Model Diesel Using Hydroperoxide Generated via In-Situ Reaction of Octane with Oxygen 被引量:1
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作者 Guo Erliang Li Jianxin +4 位作者 Huang Xiaoqiao Duan Yongshen Zhang Lingcong Yan Lijun Lu Shuxiang 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2018年第1期116-122,共7页
The potential of carrying out oxidative desulfurization(ODS) using oxygen as an oxidant was explored in this work. n-Octane firstly reacted with oxygen to produce hydroperoxides in-situ, which were then used as oxidan... The potential of carrying out oxidative desulfurization(ODS) using oxygen as an oxidant was explored in this work. n-Octane firstly reacted with oxygen to produce hydroperoxides in-situ, which were then used as oxidants to oxidize the dibenzothiophene(DBT) in the absence of catalysts. The hydroperoxides generated in-situ were effective in oxidizing DBT to its corresponding dibenzothiophene sulfone(DBTO_2) which was characterized by FT-IR and ~1H-NMR. The removal rate of DBT could reached 98.4% under conditions covering a temperaure of 140℃, a rection duration of 4 h, and an oxygen partial pressure of 0.4 MPa. The influences of different hydrocarbon components in diesel on DBT removal were investigated. The results showed that cyclohexane and n-dodecane had no effect on the removal of DBT, but xylene had a slight negative effect on DBT removal. A possible oxidation mechanism was proposed and the concentration of hydroperoxides in both O_2-oxidized octane and model diesel were detected. 展开更多
关键词 oxidative desulfurization OXYGEN dibenzothiophenE HYDROPEROXIDES GENERATED in-situ
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Isolation of Soil Bacteria Species for Degrading Dibenzothiophene 被引量:2
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作者 姜成英 刘会洲 +1 位作者 谢渝春 陈家镛 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2002年第4期420-426,共7页
Five bacterial strains, which are able to grow and to disintegratedibenzothiophene (DBT) and diben- zothiophene sulfone (DBTO_2) infossil fuels, are isolated. Analysis of products of DBT metabolizedby these strains sh... Five bacterial strains, which are able to grow and to disintegratedibenzothiophene (DBT) and diben- zothiophene sulfone (DBTO_2) infossil fuels, are isolated. Analysis of products of DBT metabolizedby these strains shows that different bacteria strains oxidized DBTby different pathways. The isolated strains R-6, $-16, $-9 and R-8can metabolize DBT to DBTO_2 and 3-hydroxybiphenyl (HBP), which areidentified as Bacillus brevis, Bacillus Sphaericus, Nocardiagloberula and Pseudomonas delafieldii respectively. 展开更多
关键词 BIODEGRADATION biodesulfurzation dibenzothiophenE bacteria strain
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