期刊文献+
共找到15篇文章
< 1 >
每页显示 20 50 100
Effect of mesopore spatial distribution of HZSM-5 catalyst on zinc state and product distribution in 1-hexene aromatization
1
作者 Chenhao Wei Di Gao +3 位作者 Guohao Zhang Liang Zhao Jinsen Gao Chunming Xu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第3期16-26,共11页
1-hexene aromatization is a promising technology to convert excess olefin in fluid catalytic cracking(FCC)gasoline to high-value benzene(B),toluene(T),and xylene.Besides,the increasing market demand of xylene has put ... 1-hexene aromatization is a promising technology to convert excess olefin in fluid catalytic cracking(FCC)gasoline to high-value benzene(B),toluene(T),and xylene.Besides,the increasing market demand of xylene has put forward higher requirements for new generation of catalyst.For increasing xylene yield in 1-hexene aromatization,the effect of mesopore structure and spatial distribution on product distribution and Zn loading was studied.Catalysts with different mesopore spatial distribution were prepared by post-treatment of parent HZSM-5 zeolite,including NaOH treatment,tetra-propylammonium hydroxide(TPAOH)treatment,and recrystallization.It was found the evenly distributed mesopore mainly prolongs the catalyst lifetime by enhancing diffusion properties but reduces the aromatics selectivity,as a result of damage of micropores close to the catalyst surface.While the selectivity of high-value xylene can be highly promoted when the mesopore is mainly distributed interior the catalyst.Besides,the state of loaded Zn was also affected by mesopores spatial distribution.On the optimized catalyst,the xylene selectivity was enhanced by 12.4%compared with conventional Zn-loaded parent HZSM-5 catalyst at conversion over 99%.It was attributed to the synergy effect of mesopores spatial distribution and optimized acid properties.This work reveals the role of mesopores in different spatial positions of 1-hexene aromatization catalysts in the reaction process and the influence on metal distribution,as well as their synergistic effect two on the improvement of xylene selectivity,which can improve our understanding of catalyst pore structure and be helpful for the rational design of high-efficient catalyst. 展开更多
关键词 1-hexene aromatization Alkali treatment Xylene selectivity MESOPORES Zinc state
下载PDF
Measurement and Correlation of Liquid-liquid Equilibria for 1-Hexene-n-Hexane-3-Methysulfolane
2
作者 Ma Rui Tian Longsheng +2 位作者 Zhao Ming Yang Mingke Qie Siyuan 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第2期81-87,共7页
Utilizing solvent extraction to separate alkanes and olefins from catalytic light gasoline is an effective method for maximizing the utility of gasoline fractions.This study presents the determination of liquid-liquid... Utilizing solvent extraction to separate alkanes and olefins from catalytic light gasoline is an effective method for maximizing the utility of gasoline fractions.This study presents the determination of liquid-liquid equilibrium data for the ternary system of 1-hexene-n-hexane-3-methylsulfolane at 30℃,40℃,and 50℃under atmospheric pressure.The obtained data facilitated the construction of a ternary phase diagram for the system.The results showed that the extraction selectivity of 1-hexene/n-hexane exceeded 1.5 when using 3-methylsulfolane as the extraction solvent.Furthermore,the thermodynamic consistency of the experimental data was examined using Hand’s equation and the Othmer-Tobias method.The correlation coefficient,R^(2)≥0.9578,indicated the acceptable reliability of the phase equilibrium data.Subsequently,the NRTL(non-random two liquid)model was used to correlate the liquid-liquid phase equilibrium data and derive the binary interaction parameter.Notably,the results demonstrated that the root mean square deviation of the NRTL model correlation values from the experimental values did not exceed 2.5%. 展开更多
关键词 liquid-liquid phase equilibrium 1-hexene N-HEXANE 3-methylsulfolane NRTL
下载PDF
Effect of H_2S on the transformation of 1-hexene over NiMoS/γ-Al_2O_3 with hydrogen 被引量:1
3
作者 Xiqiang Si Daohong Xia Yuzhi Xiang Yulu Zhou 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2010年第2期185-188,共4页
The effect of H2S contents on the transformation of 1-hexene with hydrogen over NiMoS/γ-Al2O3 catalyst was investigated.Inhibition of H2S on both hydrogenation and isomerization reactions of olefin has been demonstra... The effect of H2S contents on the transformation of 1-hexene with hydrogen over NiMoS/γ-Al2O3 catalyst was investigated.Inhibition of H2S on both hydrogenation and isomerization reactions of olefin has been demonstrated.And the promotion effect of H2S on the formation of C6 thiols and C12 thioethers has also been observed.It was found out that there was only one type of active site on the NiMoS/γ-Al2O3 for reactions which include hydrogenation reaction,isomerization reaction and sulfides formation reaction,and the formation reactions of sulfides were superior to both hydrogenation and isomerization reactions.The reaction network for the conversion of 1-hexene in the presence of H2S was proposed. 展开更多
关键词 1-hexene H2S recombination MERCAPTAN SULFIDE HYDROGEN
下载PDF
Liquid-Liquid Equilibrium for Extraction of Benzene from 1-Hexene Using Two Different Solvents 被引量:1
4
作者 Lü Yan Li Songyuan +1 位作者 Xin Kun Lin yun 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2018年第1期61-66,共6页
Two different solvents had been used to separate benzene from 1-hexene under atmosphere pressure by employing one of the following two solvents, viz.: dimethyl sulfoxide (DMSO) at 298.15 K and 318.15 K, and furfural a... Two different solvents had been used to separate benzene from 1-hexene under atmosphere pressure by employing one of the following two solvents, viz.: dimethyl sulfoxide (DMSO) at 298.15 K and 318.15 K, and furfural at 298.15 K. A series of liquid-liquid equilibrium (LLE) data had been obtained and the distribution coefficient together with the separation factor were calculated from them. Both the NRTL and the UNIQUAC models could fit in with the experimental data quite well. 展开更多
关键词 LIQUID-LIQUID EQUILIBRIA BENZENE 1-hexene FURFURAL dimethyl SULFOXIDE
下载PDF
STUDY ON 1-HEXENE POLYMERIZATION BASED ON ZIEGLER-NATTA CATALYSTS WITH DOPED SUPPORT 被引量:1
5
作者 范志强 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2004年第4期305-308,共4页
A series of Ti/Mg supported catalysts are prepared by using ball-milled mixtures of MgCl2-ethanol adducts and NaCl as supports, and 1-hexene polymerizations catalyzed by the novel catalysts are studied. It is found th... A series of Ti/Mg supported catalysts are prepared by using ball-milled mixtures of MgCl2-ethanol adducts and NaCl as supports, and 1-hexene polymerizations catalyzed by the novel catalysts are studied. It is found that the molecular weight distribution of poly(1-hexene) becomes apparently narrower when catalysts with doped supports are used, indicating that changing the structure of the support is an effective way to regulate the active center distribution of heterogeneous Ziegler-Natta catalyst. 展开更多
关键词 Ziegler-Natta catalyst Doped support 1-hexene polymerizations
下载PDF
STUDY ON THE ADDITION REACTION OF 1-IODO-4-CHLOROPERFLOROBUTANE TO 1-HEXENE UNDER REDUCTIVE CONDITIONS
6
作者 Chang Ming HU Jian CHEN 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第2期109-110,共2页
Promoted by various reductants,the addition of 1-iodo-4-chloro- perfluorobutane to 1-hexene giving 1:1 adduct is reported.Based on these facts,several new redox systems are proposed.
关键词 CHC STUDY ON THE ADDITION REACTION OF 1-IODO-4-CHLOROPERFLOROBUTANE TO 1-hexene UNDER REDUCTIVE CONDITIONS Free RT
下载PDF
Thermodynamic Investigation on the Pyrolysis of 1-Hexene
7
作者 程学礼 赵燕云 +1 位作者 李丽清 李震 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2013年第2期165-172,共8页
The pyrolysis of 1-hexene can act as a prototype of pyrolytic mechanism in petro- leum processing. Details of C-C bond cleavage in the 1-hexene pyrolysis were investigated at the MP2/6-31 I++G^** basis set level. ... The pyrolysis of 1-hexene can act as a prototype of pyrolytic mechanism in petro- leum processing. Details of C-C bond cleavage in the 1-hexene pyrolysis were investigated at the MP2/6-31 I++G^** basis set level. The equilibrium geometries and key thermodynamic parameters such as Gibbs free energies and thermal enthalpies were gained. Our theoretical results show that the entropy effect plays a significant role in dissociative processes. The dissociation of 1-hexene-4-yl radical into C4H6 and C2H5 is not an H-transfer and C-C rupture elementary reaction, but a process involving H-transfer and C-C rupture. 展开更多
关键词 1-hexene PYROLYSIS MP2 reaction mechanism
下载PDF
Skeletal Isomerization of 1-Hexene over MCM-22 Zeolite Catalyst
8
作者 Song Yi Shang Liyan Zhai Yuchun 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2012年第4期24-27,共4页
The performance of MCM-22 zeolite for catalytic isomerization of 1-hexene has been studied. At a n(H2)/n(1-hexene) ratio of 8, the influence of steam treatment temperature, reaction temperature and reaction pressure o... The performance of MCM-22 zeolite for catalytic isomerization of 1-hexene has been studied. At a n(H2)/n(1-hexene) ratio of 8, the influence of steam treatment temperature, reaction temperature and reaction pressure on the performance of MCM-22 zeolite for catalytic skeletal isomerization of 1-hexene was examined. The experimental results showed that at a steam treatment temperature of 500℃, a reaction temperature of 270℃, a space velocity of 1.0 h-1 and a reaction pressure of 0.2 MPa, the MCM-22 zeolite exhibited excellent performance for catalytic skeletal isomerization of 1-hexene with the i-hexene yield reaching 66.15%. Compared with other commonly used molecular sieve catalysts, the MCM-22 zeolite catalyst exhibited better catalytic performance for skeletal isomerization of 1-hexene. 展开更多
关键词 MCM-22 zeolite 1-hexene skeleton isomerization
下载PDF
Copolymerization of Ethylene/1-hexene and Polymerization of Propylene with Cp-indenyl Zirconium Complexes
9
作者 张勇 杨晓霞 +2 位作者 余亦华 钱延龙 黄吉玲 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2005年第8期1081-1084,共4页
Complexes (R^1Cp)(R^2Ind)ZrCl2, the catalysts previously reported active for ethylene polymerization showed high activity in ethylene/1-hexene copolymerization and propylene polymerization in the presence of MAO. ... Complexes (R^1Cp)(R^2Ind)ZrCl2, the catalysts previously reported active for ethylene polymerization showed high activity in ethylene/1-hexene copolymerization and propylene polymerization in the presence of MAO. The content of 1-hexene in copolymers ranged from 1.2% to 3.2%. In propylene polymerization the complex 1 showed the highest activity, up to 1.2×10^6 g of polypropylene per mol of catalyst per hour. Based on the analysis of NMR spectral data, the relationships between complex structures and polymerization results were explored. 展开更多
关键词 INDENYL CYCLOPENTADIENYL zirconium ETHYLENE 1-hexene PROPYLENE metallocene complex
原文传递
Copolymerization of 1-butene and 1-hexene with supported titanium catalyst
10
作者 ZHAO Yongxian SHAO Huafeng +2 位作者 WANG Bo YAO Wei HUANG Baochen 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2007年第3期304-309,共6页
With TiCl4/MgCl2(Ti)and Al(i-Bu)3(Al)as catalysts,the thermoplastic copolymer of 1-butene(Bt)and 1-hexene(He)was synthesized successfully.The effects of Bt/He,Ti/(He+Bt),Al/Ti,temperature and reaction time on conversi... With TiCl4/MgCl2(Ti)and Al(i-Bu)3(Al)as catalysts,the thermoplastic copolymer of 1-butene(Bt)and 1-hexene(He)was synthesized successfully.The effects of Bt/He,Ti/(He+Bt),Al/Ti,temperature and reaction time on conversion,catalyst efficiency(CE),intrinsic viscosity([g])and insoluble content were studied.The copolymer was analyzed with Fourier transform-infrared(FTIR)and nuclear magnetic resonance(1H-NMR).Results showed that the optimal polymerization conditions were:He/Bt=0.25,temperature 40℃–50℃,Al/Ti=400–500,Ti/(Bt+He)=3x10-5-4x10-5,time 4 h.Intrinsic viscosity was found to increase with increasing Ti/(Bt+He)and decreasing Al/Ti and polymerization temperature.When the molar content of He,Al/Ti and polymerization temperature increased,the insoluble content in CH2Cl2 of copolymers decreased.When Ti/(Bt+He)and reaction time increased,the insoluble con-tent in CH2Cl2 of copolymers also increased.The crystal-lization and stereoregularity of poly(1-butene)decreased with the addition of He. 展开更多
关键词 1-BUTENE 1-hexene supported titanium catalyst COPOLYMERIZATION thermoplastic elastomer
原文传递
采用GC-MS技术分析合成己烯-1中间产品组成 被引量:1
11
作者 田炳全 衣学飞 +1 位作者 王枫 孙代秋 《分析测试学报》 CAS CSCD 北大核心 2004年第z1期293-294,共2页
  己烯-1是重要的化工原料,应用范围非常广,利用乙烯作为原料合成己烯-1是一种在国内同行业中处于领先地位的新技术.为了全面了解合成中各个环节的情况,需要对各部分的中间产品的组成进行分析,以便确定最佳的工艺参数.……
关键词 1-hexene COMPONENTS GC - MS
下载PDF
Amino acid-assisted synthesis of TS-1 zeolites containing highly catalytically active TiO_(6)species 被引量:2
12
作者 Yuyao Wang Li Li +4 位作者 Risheng Bai Shiqin Gao Zhaochi Feng Qiang Zhang Jihong Yu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第12期2189-2196,共8页
Tailoring the Ti coordination states in titanosilicate zeolites to simultaneously improve feedstock conversion and maximize the target product selectivity remains a challenge in the pursuit of high-performance catalys... Tailoring the Ti coordination states in titanosilicate zeolites to simultaneously improve feedstock conversion and maximize the target product selectivity remains a challenge in the pursuit of high-performance catalysts for selective oxidation reactions.Herein,we provide a facile strategy to synthesize hierarchical anatase-free TS-1(MFI-type)zeolites with tetrahedrally coordinated(TiO_(4))and octahedrally coordinated Ti species(TiO_(6)).The TiO_(4)species provide high epoxide selectivity,while the TiO_(6)species afford improved alkene conversion.This strategy is achieved by synergistically using an L-lysine-assisted approach and a two-step crystallization;the two-step crystallization approach prevents the formation of anatase TiO_(2),while L-lysine stabilizes the TiO_(6)species and ensures efficient incorporation of TiO_(6)into the anatase-free TS-1 zeolites.Compared with their conventional counterparts,which only contain TiO_(4)species,the as-prepared TS-1 zeolites(Si/Ti=36.9)result in a higher 1-hexene conversion(33%),higher TON value(153),and comparable epoxide selectivity(95%).This synthetic strategy provides avenues to tailor the amount and distribution of Ti species in titanosilicate zeolites to achieve high catalytic performances in various processes. 展开更多
关键词 TS-1 zeolites Ti species L-Lysine-assisted approach 1-hexene epoxidation
下载PDF
EFFECTS OF EXTERNAL DONOR ON ACTIVE CENTER DISTRIBUTION OF SUPPORTED ZIEGLER-NATTA CATALYST 被引量:1
13
作者 范志强 M.CarmelaSacchi PaoloLocatelli 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1997年第3期217-225,共9页
The composition distribution (CD) and microisotacticity distribution (ID) of propene/1-hexene copolymer synthesized by MgCl2/DIBP/TiCl4 (DIBP: diisobutyl phthalate) were determined by fractionating the copolymers acco... The composition distribution (CD) and microisotacticity distribution (ID) of propene/1-hexene copolymer synthesized by MgCl2/DIBP/TiCl4 (DIBP: diisobutyl phthalate) were determined by fractionating the copolymers according to crystallinity and characterizing the fractions by (CNMR)-C-13. The effects of two alkoxysilane donors, triethoxyphenylsilane (PTES) and dimethoxydi-tert-butylsilane (TBMS), on CD and ID of the copolymers were compared. Three main parts in the CD diagram of each copolymer were distinguished, which were correlated to active center distribution (ACD) based on three groups of different active centers. By studying the changes in l-hexene content, microisotacticity and reactivity ratio product of three typical fractions, the effects of external donor on ACD were better elucidated. It was found that TBMS shows much stronger effects on ACD than PTES. In the former system, most fractions were produced on active centers with relatively lower r(1)r(2), higher reactivity to I-hexene, and higher stereospecificity as compared to the system without external donor. It is concluded that the observed very extensive changes in ACD are mainly resulted by the formation of new types of active centers, possibly by coordination of external donor to certain positions on the catalyst. 展开更多
关键词 supported Ziegler-Natta catalyst propene/1-hexene copolymer external donor active center distribution
下载PDF
Aromatic compounds-mediated synthesis of anatase-free hierarchical TS-1 zeolite:Exploring design strategies via machine learning and enhanced catalytic performance 被引量:1
14
作者 Chang’an Wang Guoqing An +9 位作者 Jing Lin Xiaowei Zhang Zhiyuan Liu Yibin Luo Siqi Liu Zhixiang Cheng Tingting Guo Hongyi Gao Ge Wang Xingtian Shu 《Aggregate》 2023年第4期138-151,共14页
Simultaneous achievement of constructing mesopores and eliminating anatase is a long-term pursuit for enhancing the catalytic performance of TS-1.Here,we developed an aromatic compounds-mediated synthesis method to pr... Simultaneous achievement of constructing mesopores and eliminating anatase is a long-term pursuit for enhancing the catalytic performance of TS-1.Here,we developed an aromatic compounds-mediated synthesis method to prepare anatase-free and hierarchical TS-1 for olefin epoxidation.A series of hierarchical TS-1 zeolites were prepared by introducing aromatic compounds containing different functional groups via the crystallization process.The formation of intercrystalline mesopores and insertion of titanium into framework were facilitated at different extent.The synergistic coordination of carboxyl and hydroxyl in aromatic compounds with Ti(OH)4 realizes the uniform distribution of titanium species and eliminates the generation of anatase.Noteworthily,eight machine learning models were trained to reveal the mechanism of additive functional groups and preparation conditions on anatase formation and microstructure optimization.The prediction accuracy of most models can reach more than 80%.Benefiting from the larger mesopore volumes(0.37 cm3⋅g−1)and higher content of framework Ti species,TS-DHBDC-48h samples exhibit a higher catalytic performance than other zeolites,giving 1-hexene conversion of 49.3%and 1,2-epoxyhenane selectivity of 99.9%.The paper provides a facile aromatic compounds-mediated synthesis strategy and promotes the application of machine learning toward the design and optimization of new zeolites. 展开更多
关键词 1-hexene epoxidation aromatic compounds machine learning SELECTIVITY TS-1 zeolites
原文传递
Enantiomeric Binaphtyl-brided SALEN Zirconium Complexes as Catalysts for Stereoselective Polymerization of Chiral Olefins
15
作者 M.Strianese M.Lamberti +1 位作者 M.Mazzeo C.Pellecchia 《复旦学报(自然科学版)》 CAS CSCD 北大核心 2007年第5期807-,共1页
1 Results Chiral Schiff-base complexes have been used as catalysts for several stereoselective organic transformations,but they have never been tested for the polymerization of chiral olefins.The preferential polymeri... 1 Results Chiral Schiff-base complexes have been used as catalysts for several stereoselective organic transformations,but they have never been tested for the polymerization of chiral olefins.The preferential polymerization of a single monomeric enantiomer (stereoselective polymerization) pursues two intriguing goals: i) the development of polymeric materials with peculiar optical or physical properties and ii) the kinetic resolution of racemic alkenes. 展开更多
关键词 4-methyl-1-hexene ENANTIOSELECTIVITY Schiff-base complex stereospecific polymers
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部