期刊文献+
共找到43篇文章
< 1 2 3 >
每页显示 20 50 100
Synthesis and characterization of multiwall carbon nanotubes/alumina nanohybrid-supported cobalt catalyst in Fischer-Tropsch synthesis 被引量:1
1
作者 Ali Karimi Bahram Nasernejad Ali Morad Rashidi 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2013年第4期582-590,共9页
Multiwall carbon nanotubes (MWNTs) and alumina are combined to give a new type of nanohybrid for Fisher-Tropsch synthesis (FTS) catalyst support. Alumina nano-particles (10 wt%) were introduced directly on funct... Multiwall carbon nanotubes (MWNTs) and alumina are combined to give a new type of nanohybrid for Fisher-Tropsch synthesis (FTS) catalyst support. Alumina nano-particles (10 wt%) were introduced directly on functionalized MWNTs by a modified sol-gel method. Microstructure observations show that alumina particles were homogeneously dispersed on the inside and outside of modified MWNTs surfaces. 15 wt% cobalt loading catalysts were prepared with this nanohybrid and γ-alumina as a reference, using a sol-gel technique and wet impregnation method respectively. These catalysts were characterized by TEM, XRD, N2-adsorption, H2 chemisorption and TPR. The deposition of cobalt nanoparticles synthesized by sol-gel technique on the MWNTs nanohybrid shift the reduction peaks to a low temperature, indicating higher reducibility for uniform cobalt particles. Nanohybrid also aided in high dispersion of metal clusters and high stability and performance of catalyst. The proposed MWNTs nanohybrid-supported cobalt catalysts showed the improved FTS rate (gHc/(gcat.min)), CO conversion (%), and water gas shift rate (WGS)(gcoz/(gcat.h)) of 0.012, 52, and 30E-3, respectively, as compared to those of 0.007, 25, and 18E-3, respectively, on the γ-alumina-supported cobalt catalysts with the same Co loading. 展开更多
关键词 carbon nanotubes NANOHYBRID cobalt catalyst alumina FT synthesis SOL-GEL
下载PDF
Fischer-Tropsch Synthesis over Alumina- Supported Cobalt-Based Catalysts: Effect of Support Variables 被引量:1
2
作者 Yan Liu Heqin Guo +6 位作者 Litao Jia Zhancheng Ma Yong Xiao Congbiao Chen Ming Xia Bo Hou Debao Li 《Journal of Materials Science and Chemical Engineering》 2014年第12期19-27,共9页
Different kinds of aluminum precursors were obtained from precipitating ammonium bicarbonate, ammonium carbonate, and saturated ammonium bicarbonate, then, boehmite (AlO(OH)), ammonium alumina carbonate hydroxide (AAC... Different kinds of aluminum precursors were obtained from precipitating ammonium bicarbonate, ammonium carbonate, and saturated ammonium bicarbonate, then, boehmite (AlO(OH)), ammonium alumina carbonate hydroxide (AACH) and their mixture were obtained, and then, different kinds of alumina were obtained after calcination. Three catalysts supported on the different alumina were obtained via impregnating cobalt and ruthenium by incipient wetness. The effects of different precipitants on composition of precursors were?studied by XRD, FTIR, and TGA. The property and structure of alumina were studied by XRD and BET. The supported catalysts were studied by characterizations of XRD and H2-TPR, and the catalytic performance for Fischer-Tropsch synthesis (FTS) were evaluated at a fix-bed reactor. The relations among the composition of precursors, the property of alumina and the catalytic performance of supported catalysts were researched thoroughly. 展开更多
关键词 cobalt-Based catalysts FISCHER-TROPSCH Synthesis alumina PRECIPITANT
下载PDF
Solvent-free synthesis of alumina supported cobalt catalysts for Fischer–Tropsch synthesis 被引量:1
3
作者 Mengnan Lu Nouria Fatah Andrei Y.Khodkov 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2016年第6期1001-1007,共7页
A novel mechano-synthesis method has been elaborated in this work for the design of efficient cobalt-based Fischer–Tropsch catalysts. The process aims to reduce the total number of steps involved in the synthesis of ... A novel mechano-synthesis method has been elaborated in this work for the design of efficient cobalt-based Fischer–Tropsch catalysts. The process aims to reduce the total number of steps involved in the synthesis of solid catalysts and thus to avoid relevant toxic solutions generated during the catalyst preparation. The mechano-synthesis of the Co/Al2O3catalyst was processed in a low-energy vibratory micro mill and high energy planetary ball mill. Porous spherical γ-aluminas (1860 µm and 71 µm mean particle diameter) were used in this work as host compounds. Co3O4(3 µm mean particle diameter) has provided guest particles for mechano-synthesis. The catalysts were characterized by textural (surface area, porosity and particle size) and structural analyses (X-ray diffraction, TPR, SEM-EDX and microprobe). The microprobe images show deposition of Co3O4on the surface of the alumina and indicated no Co3O4diffusion inside the alumina pores. SEM-EDX mapping illustrated that cobalt coating tended to occur on surface of rounded shape of cracked alumina fragments. After milling, the crystallite size of Co3O4decreased to 15 nm from 30 to 50 nm. The TPR profiles indicated very low concentrations of inactive cobalt aluminate mixed compounds which are usually produced during the catalyst preparation by impregnation. In Fischer–Tropsch synthesis, the catalysts prepared using mechano-synthesis methods showed catalytic performance comparable to the catalysts prepared by impregnation. © 2016 Science Press 展开更多
关键词 alumina Ball mills catalystS cobalt Crystallite size IMPREGNATION Particle size Particle size analysis X ray diffraction
下载PDF
An Experimental Study of the Performance of Isomorphically Zirconium-Substituted Mesoporous Alumina Supported Cobalt Catalysts in Fischer-Tropsch Synthesis
4
作者 Sabar Simanungkalit Mingming Zhu +2 位作者 Gia Hung Pham Zhezi Zhang Dongke Zhang 《Advances in Chemical Engineering and Science》 2022年第1期40-53,共14页
A series of mesoporous alumina (MA) supported cobalt (Co/MA) catalysts with MA isomorphically substituted by zirconium (Zr) were synthesised and evaluated for their performance in the Fischer</span><span styl... A series of mesoporous alumina (MA) supported cobalt (Co/MA) catalysts with MA isomorphically substituted by zirconium (Zr) were synthesised and evaluated for their performance in the Fischer</span><span style="font-family:Verdana;">-</span><span style="font-family:""><span style="font-family:Verdana;">Tropsch synthesis. The Zr/(Zr + Al) atomic ratios varied from 1% - 15%. A zirconium-impregnated Co/MA catalyst prepared by wet impregnation with a Zr/(Zr + Al) atomic ratio of 5% was also evaluated to examine Zr incorporation’s effect method. The catalysts synthesised were characterised using N</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;"> adsorption-desorption, X-ray Powder Diffraction (XRD), Transmission Electron Microscopy (TEM), and X-Ray Photoelectron Spectroscopy (XPS). It was found that Zr</span><sup><span style="font-family:Verdana;">4+</span></sup><span style="font-family:Verdana;"> ions were incorporated into the framework of MA and kept intact up to a Zr/(Zr + Al) atomic ratio of 5%. The cobalt dispersion and reducibility were improved as the Zr/(Zr + Al) atomic ratio increased to 50%. The performance of these catalysts for Fischer</span></span><span style="font-family:Verdana;">-</span><span style="font-family:""><span style="font-family:Verdana;">Tropsch synthesis was evaluated using a fixed bed reactor at temperature and pressure of 493 K and 20 bar, respectively. The feed syngas </span><span><span style="font-family:Verdana;">had an H</span><sub><span style="font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">/CO ratio of 2, diluted with 10% Ar. For isomorphically</span></span><span style="font-family:Verdana;"> Zr-substituted Co/MA, the CO conversion and selectivity of diesel (C</span><sub><span style="font-family:Verdana;">10</span></sub><span style="font-family:Verdana;"> - C</span><sub><span style="font-family:Verdana;">20</span></sub><span style="font-family:Verdana;">) increased first and then decreased with increasing the Zr/(Zr + Al) atomic ratio. The maximum 38.9% CO conversion and 34.6% diesel (C</span><sub><span style="font-family:Verdana;">10</span></sub><span style="font-family:Verdana;"> - C</span><sub><span style="font-family:Verdana;">20</span></sub><span style="font-family:Verdana;">) selectivity were obtained at Zr/(Zr + Al) atomic ratio of 5%. The isomorphic substitution method was better than the wet impregnation method in CO conversion and diesel selectivity. 展开更多
关键词 cobalt catalyst Fischer-Tropsch Synthesis Isomorphic Substitution Mesoporous alumina ZIRCONIUM
下载PDF
Effect of cobalt loading on reducibility, dispersion and crystallite size of Co/Al_2O_3 Fischer-Tropsch catalyst 被引量:1
5
作者 熊海峰 张煜华 +1 位作者 李金林 古映莹 《Journal of Central South University of Technology》 2004年第4期414-418,共5页
Co/Al2O3 Fischer-Tropsch synthesis catalysts with different cobalt loadings were prepared using incipient wetness impregnation method. The effects of cobalt loading on the properties of catalysts were studied by means... Co/Al2O3 Fischer-Tropsch synthesis catalysts with different cobalt loadings were prepared using incipient wetness impregnation method. The effects of cobalt loading on the properties of catalysts were studied by means of X-ray diffraction (XRD), temperature programmed reduction (TPR), hydrogen temperature programmed desorption (H2-TPD) and O2 titration. Co-support compound formation can be detected in catalyst system by XRD. For the Co/Al2O3 catalysts with low cobalt loading, CoAl2O4 phase appears visibly. Two different reduction regions can be presented for Co/Al2O3 catalysts, which belong to Co3O4 crystallites (reduction at 320 ℃) and cobalt oxide-alumina interaction species (reduction at above 400 ℃). Increasing Co loading results in the increase of Co3O4 crystallite size. The reduced Co/Al2O3 catalysts have two adsorption sites, and cobalt loading greatly influences the adsorption behavior. With the increase of cobalt loading, the amount of low temperature adsorption is increased, the amount of high temperature adsorption is decreased, and the percentage reduction and cobalt crystallite size are increased. 展开更多
关键词 Fischer-Tropsch synthesis cobalt/alumina catalyst temperature programmed reduction hydrogen temperature programmed desorption
下载PDF
Effects of the Different Supports on the Activity and Selectivity of Iron-Cobalt Bimetallic Catalyst for Fischer-Tropsch Synthesis 被引量:3
6
作者 Xiangdong Ma Qiwen Sun +2 位作者 Fahai Cao Weiyong Ying Dingye Fang 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2006年第4期335-339,共5页
Silica, alumina, and activated carbon supported iron-cobalt catalysts were prepared by incipient wetness impregnation. These catalysts have been characterized by BET, X-ray diffraction (XRD), and temperature-program... Silica, alumina, and activated carbon supported iron-cobalt catalysts were prepared by incipient wetness impregnation. These catalysts have been characterized by BET, X-ray diffraction (XRD), and temperature-programmed reduction (TPR). Activity and selectivity of iron-cobalt supported on different carriers for CO hydrogenation were studied under the conditions of 1.5 MPa, 493 K, 630 h^-1, and H2/CO ratio of 1.6. The results indicate that the activity, C4 olefin/(C4 olefin+C4 paraffin) ratio, and C5 olefin/(C5 olefin+C5 paraffin) decrease in the order of Fe-Co/SiO2, Fe-Co/AC1, Fe-Co/Al2O3 and Fe- Co/AC2. The activity of Fe-Co/SiO2 reached a maximum. The results of TPR show that the Fe-Co/SiO2 catalyst is to some extent different. XRD patterns show that the Fe-Co/SiO2 catalyst differs significantly from the others; it has two diffraction peaks. The active spinel phase is correlated with the supports. 展开更多
关键词 Fischer-Tropsch synthesis bimetallic catalyst iron cobalt support silica alumina active carbon SYNGAS
下载PDF
Methane Dry Reforming over Alumina Supported Co Catalysts
7
作者 Sergio L. González Cortés Malcolm L. H. Green 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2004年第4期457-461,共5页
A series of Co/γ-Al_2O_3 catalysts were prepared with the impregnation method and characterized by means of the BET specific surface area, X-ray diffraction(XRD), thermogravimetric analysis(TGA) and Laser Raman spect... A series of Co/γ-Al_2O_3 catalysts were prepared with the impregnation method and characterized by means of the BET specific surface area, X-ray diffraction(XRD), thermogravimetric analysis(TGA) and Laser Raman spectroscopy. The Co/γ-Al_2O_3 catalysts were activated by using H_2, 20%CH_4/H_2 or CH_4, respectively. There was no obvious difference between the activities of the Co/γ-Al_2O_3 catalyst activated by using the different activation methods for methane dry reforming. The catalytic properties of the Co/γ-Al_2O_3 catalysts with different Co loadings were also investigated. The optimized Co loading for the Co/γ-Al_2O_3 catalyst pretreated with 20% CH_4/H_2 is around 12%(mass fraction). 展开更多
关键词 Methane dry reforming alumina supported cobalt catalysts Catalytic deactivation
下载PDF
Promotion Effects of Ceria on Fischer-Tropsch Synthesis Performance of Co/Al_2O_3 Catalyst
8
作者 代小平 余长春 沈师孔 《Petroleum Science》 SCIE CAS CSCD 2004年第3期82-86,共5页
The addition of small amounts of ceria to Co/Al2O3 catalysts increases the turnover rate of the catalyst and C5+ selectivity in the Fischer-Tropsch synthesis. In this work, the amounts of ceria, the calcination tempe... The addition of small amounts of ceria to Co/Al2O3 catalysts increases the turnover rate of the catalyst and C5+ selectivity in the Fischer-Tropsch synthesis. In this work, the amounts of ceria, the calcination temperature, the temperature-programmed reduction (TPR), the temperature-programmed oxidation (TPO), and XRD are investigated. The results show that the addition of small amounts of ceria to Co/Al2O3 catalyst (Ce/Co≈1∶ 10 ~1∶ 7, atom) can increase the CO conversion and liquid yield, while the calcination temperature can control both the chain growth probability and CO conversion in a reverse trend. The TPR and TPO experiments show that small amounts of Ceria can improve the reducibility, but the amounts of carbon deposit increase, and two-type carbon deposition is found in the short-term reaction catalyst. 展开更多
关键词 Fischer-Tropsch synthesis cobalt catalyst alumina CERIUM TP carbon deposition
下载PDF
Influence of Gas Components on the Formation of Carbonyl Sulfide over Water-Gas Shift Catalyst B303Q
9
作者 Ju Shangguan Litong Liang Huiling Fan Fang Shen 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2007年第1期53-59,共7页
Water-gas shift reaction catalyst at lower temperature (200-400 ℃) may improve the conversion of carbon monoxide. But carbonyl sulfide was found to be present over the sulfided cobaltmolybdenum/alumina catalyst for... Water-gas shift reaction catalyst at lower temperature (200-400 ℃) may improve the conversion of carbon monoxide. But carbonyl sulfide was found to be present over the sulfided cobaltmolybdenum/alumina catalyst for water-gas shift reaction. The influences of temperature, space velocity, and gas components on the formation of carbonyl sulfide over sulfided cobalt-molybdenum/alumina catalyst B303Q at 200-400 ℃ were studied in a tubular fixed-bed quartz-glass reactor under simulated water-gas shift conditions. The experimental results showed that the yield of carbonyl sulfide over B303Q catalyst reached a maximum at 220 ℃ with the increase in temperature, sharply decreased with the increase in space velocity and the content of water vapor, increased with the increase in the content of carbon monoxide and carbon dioxide, and its yield increased and then reached a stable value with the increase in the content of hydrogen and hydrogen sulfide. The formation mechanism of carbonyl sulfide over B303Q catalyst at 200-400 ℃ was discussed on the basis of how these factors influence the formation of COS. The yield of carbonyl sulfide over B303Q catalyst at 200-400 ℃ was the combined result of two reactions, that is, COS was first produced by the reaction of carbon monoxide with hydrogen sulfide, and then the as-produced COS was converted to hydrogen sulfide and carbon dioxide by hydrolysis. The mechanism of COS formation is assumed as follows: sulfur atoms in the Co9Ss-MoS2/Al2O3 crystal lattice were easily removed and formed carbonyl sulfide with CO, and then hydrogen sulfide in the water-gas shift gas reacted with the crystal lattice oxygen atoms in CoO-MoOa/Al2O3 to form Co9S8-MoS2/Al2O3. This mechanism for the formation of COS over water-gas shift catalyst B303Q is in accordance with the Mars-Van Krevelen's redox mechanism over metal sulfide. 展开更多
关键词 FORMATION carbonyl sulfide sulfided cobalt-molybdenum/alumina catalyst water-gas shift
下载PDF
不同方法制备的CoMo/Al_2O_3加氢脱硫催化剂的表征 被引量:15
10
作者 张孔远 刘爱华 +2 位作者 燕京 郭建学 刘晨光 《催化学报》 SCIE CAS CSCD 北大核心 2005年第8期639-644,共6页
采用干混法、湿混法和浸渍法制备了CoMo/Al2O3加氢脱硫催化剂.物理性质分析、X射线光电子能谱、X射线能量色散谱和程序升温硫化表征结果表明,干混法和湿混法催化剂的孔容和比表面积相当,均大于浸渍法催化剂.浸渍法催化剂的表面粒子明显... 采用干混法、湿混法和浸渍法制备了CoMo/Al2O3加氢脱硫催化剂.物理性质分析、X射线光电子能谱、X射线能量色散谱和程序升温硫化表征结果表明,干混法和湿混法催化剂的孔容和比表面积相当,均大于浸渍法催化剂.浸渍法催化剂的表面粒子明显大于两种混捏法.两种混捏法催化剂可以在低温区硫化,浸渍法催化剂的硫化可分别在低温区和高温区进行.干混法催化剂中Co和Mo在微区内分布不均匀,浸渍法催化剂中Co和Mo在催化剂表面的分散量明显高于催化剂内部,湿混法催化剂中Co和Mo在微区内呈均匀分布.湿混法催化剂的Co和Mo在催化剂表面的分散状态好于干混法和浸渍法,制备方法对催化剂中Co和Mo的存在环境及价态没有影响.石脑油加氢脱硫反应评价结果表明,湿混法催化剂的加氢脱硫活性高于浸渍法和干混法催化剂. 展开更多
关键词 氧化铝 负载型催化剂 湿混法 石脑油 加氢脱硫
下载PDF
锆改性钴基费-托合成催化剂催化性能的研究 被引量:11
11
作者 张俊岭 赵红霞 +5 位作者 陈建刚 任杰 孙予罕 谢亚宁 胡天斗 刘涛 《催化学报》 SCIE CAS CSCD 北大核心 2002年第6期530-534,共5页
考察了助剂锆和金属钴负载量对锆改性Co/Al2 O3 催化剂催化性能的影响 .结果表明 ,锆助剂能够高度分散在氧化铝载体上 ,而活性组分钴以一定尺寸存在 ;锆的添加能够明显地提高Co/Al2 O3 催化剂的催化活性和C5+ 烃选择性 ,但助剂锆含量对... 考察了助剂锆和金属钴负载量对锆改性Co/Al2 O3 催化剂催化性能的影响 .结果表明 ,锆助剂能够高度分散在氧化铝载体上 ,而活性组分钴以一定尺寸存在 ;锆的添加能够明显地提高Co/Al2 O3 催化剂的催化活性和C5+ 烃选择性 ,但助剂锆含量对催化剂催化性能的影响不大 ;在锆存在下 ,催化剂的催化活性随金属钴含量先升高后降低 .进一步的研究表明 ,催化剂上烃形成速率的提高可能是由于锆助剂能够增加催化剂的活性位数目 ,增强桥式CO吸附的强度 ,在Co ZrO2 展开更多
关键词 改性 催化性能 钴基催化剂 氧化铝 锆助剂 费-托合成 天然气 间接液化
下载PDF
Co-Ru/γ-Al2O3催化剂的F-T合成性能 被引量:7
12
作者 李晨 马向东 +1 位作者 应卫勇 房鼎业 《石油化工》 EI CAS CSCD 北大核心 2008年第1期34-38,共5页
以NH_4NO_3水溶液预处理的γ-Al_2O_3为载体,采用浸渍法制备了Co/γ-Al_2O_3催化剂,考察了添加少量贵金属Ru对Co/γ-Al_2O_3催化剂F-T合成性能的影响。实验结果表明,添加Ru可作为氢溢流源促进Co物种的还原,另外,Ru与Co相互作用形成易还... 以NH_4NO_3水溶液预处理的γ-Al_2O_3为载体,采用浸渍法制备了Co/γ-Al_2O_3催化剂,考察了添加少量贵金属Ru对Co/γ-Al_2O_3催化剂F-T合成性能的影响。实验结果表明,添加Ru可作为氢溢流源促进Co物种的还原,另外,Ru与Co相互作用形成易还原的Co-Ru物种,导致催化剂表面Co物种的还原温度降低,Co物种容易还原,反应过程中可利用的表面金属Co原子数增加;Ru可增加Co/γ-Al_2O_3催化剂表面桥式CO吸附的强度,使CO便于离解;添加少量Ru能明显提高Co/γ-Al_2O_3催化剂的活性和重质烃C_5^+的选择性。在原料气n(H_2):n(CO)=2.0、反应温度493K、压力1.5 MPa、气态空速500 h^(-1)下,15.0%Co-0.4% Ru/γ-Al_2O_3催化剂上CO的转化率和C_5^+的选择性分别为85.39%和84.28%。 展开更多
关键词 钴/γ-氧化铝催化剂 钌助催化剂 F-T合成 合成气
下载PDF
贵金属对钴基催化剂上肉桂醛选择加氢反应的影响 被引量:9
13
作者 刘百军 熊国兴 +2 位作者 潘秀莲 盛世善 杨维慎 《催化学报》 SCIE CAS CSCD 北大核心 2002年第5期481-484,共4页
研究了贵金属改性的Co/γ Al2 O3 催化剂上的肉桂醛选择加氢反应 .结果表明 ,通过Pt,Pd和Ru贵金属改性 ,提高了催化剂的活性 ,但只有Pt改性的催化剂具有较高的选择性 .w(Pt) <0 5 %时 ,催化剂的活性随着Pt含量的增加呈直线升高 ,当w... 研究了贵金属改性的Co/γ Al2 O3 催化剂上的肉桂醛选择加氢反应 .结果表明 ,通过Pt,Pd和Ru贵金属改性 ,提高了催化剂的活性 ,但只有Pt改性的催化剂具有较高的选择性 .w(Pt) <0 5 %时 ,催化剂的活性随着Pt含量的增加呈直线升高 ,当w(Pt) =0 5 %时 ,催化剂活性可提高近 5倍 ,但催化剂的选择性变化很小 .XRD结果表明 ,催化剂经还原后 ,γ Al2 O3 上的钴主要为α Co0 .TPR结果表明 ,Pt的加入提高了Co3 O4 的还原性能 ,且Pt含量越高 ,Co3 O4 的还原温度越低 .XPS结果表明 ,Pt改性的催化剂样品 ,其Co3 O4 大部分被还原为Co0 .由于Pt与Co具有协同效应 ,故Pt改性的Co/γ Al2 O3 催化剂既具有较高的活性 。 展开更多
关键词 氧化铝 钴基催化剂 肉桂醛 选择加氢 肉桂醇 催化活性
下载PDF
Cu-Ru-Co/γ-Al2O3催化剂费托合成生物质合成气性能研究 被引量:3
14
作者 李顺清 雷廷宙 +3 位作者 朱金陵 何晓峰 杨延涛 徐海燕 《太阳能学报》 EI CAS CSCD 北大核心 2016年第8期2129-2133,共5页
采用浸渍法制备Cu-Ru-Co/γ-Al_2O_3催化剂,对模拟生物质空气气化生物质合成气费托合成的性能进行研究,考察催化剂活性组分含量对催化剂性能的影响,并对催化剂进行BET、XRD、H_2-TPR以及SEM表征。结果表明Cu-Ru-Co/γ-Al_2O_3催化剂具... 采用浸渍法制备Cu-Ru-Co/γ-Al_2O_3催化剂,对模拟生物质空气气化生物质合成气费托合成的性能进行研究,考察催化剂活性组分含量对催化剂性能的影响,并对催化剂进行BET、XRD、H_2-TPR以及SEM表征。结果表明Cu-Ru-Co/γ-Al_2O_3催化剂具有较高的活性和C_(5+)选择性,这主要是由于催化剂具有高表面积、适宜的孔分布以及高分散的活性组分。 展开更多
关键词 生物质合成气 费托合成 钴氧化铝催化剂 生物质气化
下载PDF
Co-Mo加氢脱硫催化剂的TEM表征 被引量:10
15
作者 孙淑玲 石亚华 +1 位作者 徐广通 王锦业 《石油炼制与化工》 CAS CSCD 北大核心 2006年第11期1-6,共6页
采用透射电子显微镜(TEM)研究了氧化铝负载的硫化态Co-Mo加氢脱硫催化剂的分散度。用TEM半定量法的表征数据得到了MoS_2上棱边位、角位、平面位的Mo原子数目。结果表明,催化剂的加氢脱硫活性不仅与催化剂上可接近的棱边位和角位上的Mo... 采用透射电子显微镜(TEM)研究了氧化铝负载的硫化态Co-Mo加氢脱硫催化剂的分散度。用TEM半定量法的表征数据得到了MoS_2上棱边位、角位、平面位的Mo原子数目。结果表明,催化剂的加氢脱硫活性不仅与催化剂上可接近的棱边位和角位上的Mo原子数目有关,还与活性位的本征活性有关,化学处理可以使催化剂上的活性相类型发生变化,Co-Mo-S-Ⅱ类活性相的本征活性要高于Co-Mo-S-Ⅰ类活性相的本征活性。 展开更多
关键词 加氢脱硫 催化剂 氧化铝
下载PDF
CoMo/γ-Al_2O_3催化剂的制备及其加氢脱氧性能 被引量:6
16
作者 包建国 龚建议 +2 位作者 杨运泉 陈卓 蒋新民 《石油化工》 CAS CSCD 北大核心 2010年第1期42-46,共5页
采用共沸蒸馏-均匀沉淀法辅以超声波分散技术制备了纳米γ-Al2O3(γ-Al2O3(Ⅰ)),并以γ-Al2O3(Ⅰ)与商品γ-Al2O3(γ-Al2O3(Ⅱ))为载体,采用等体积浸渍法制得了Co与Mo负载量(分别以CoO与MoO3的质量分数计)分别为6%和16%的CoMo/γ-Al2O3(... 采用共沸蒸馏-均匀沉淀法辅以超声波分散技术制备了纳米γ-Al2O3(γ-Al2O3(Ⅰ)),并以γ-Al2O3(Ⅰ)与商品γ-Al2O3(γ-Al2O3(Ⅱ))为载体,采用等体积浸渍法制得了Co与Mo负载量(分别以CoO与MoO3的质量分数计)分别为6%和16%的CoMo/γ-Al2O3(Ⅰ)与CoMo/γ-A12O3(Ⅱ)催化剂,采用间歇搅拌釜考察了催化剂的苯酚加氢脱氧性能。BET,SEM,XRD,H2-TPR,NH3-TPD表征结果表明,γ-Al2O3(Ⅰ)载体呈纤维介孔状,具有较大的比表面积、孔体积及适宜的孔分布。相对于CoMo/γ-A12O3(Ⅱ)催化剂,CoMo/γ-Al2O3(Ⅰ)催化剂的活性组分高度分散于γ-Al2O3(Ⅰ)载体表面,还原性能较高,酸中心较多。苯酚加氢脱氧反应结果表明,CoMo/γ-A12O3(Ⅰ)催化剂具有较高的加氢脱氧活性,苯酚转化率为79.2%,苯选择性为89.3%。 展开更多
关键词 Γ-氧化铝 钴钼催化剂 苯酚 加氢脱氧
下载PDF
湿混捏法CoMo/Al_2O_3催化剂用于Claus反应尾气加氢转化反应 被引量:5
17
作者 张孔远 刘爱华 +1 位作者 郝国阳 刘晨光 《石油化工》 EI CAS CSCD 北大核心 2005年第11期1095-1098,共4页
采用湿混捏法制备了Claus反应尾气加氢CoMo/Al2O3催化剂;以SO2的加氢反应和CS2的水解反应为指标反应,考察了CoMo/Al2O3催化剂对Claus反应尾气的加氢转化活性,并与浸渍法CoMo/Al2O3催化剂进行对比;考察了湿混捏法CoMo/Al2O3催化剂的Co和M... 采用湿混捏法制备了Claus反应尾气加氢CoMo/Al2O3催化剂;以SO2的加氢反应和CS2的水解反应为指标反应,考察了CoMo/Al2O3催化剂对Claus反应尾气的加氢转化活性,并与浸渍法CoMo/Al2O3催化剂进行对比;考察了湿混捏法CoMo/Al2O3催化剂的Co和Mo含量及反应条件对Claus反应尾气加氢转化活性的影响.实验结果表明,在同等金属含量的条件下,湿混捏法CoMo/Al2O3催化剂的SO2加氢和CS2水解活性比浸渍法CoMo/Al2O3催化剂的活性高;湿混捏法CoMo/Al2O3催化剂较适宜的MoO3的质量分数为10.0%、CoO的质量分数为2.0%;较适宜的Claus反应尾气加氢转化反应温度为260~300℃,空速为1 250~1 750 h-1.在此条件下,SO2加氢和CS2水解转化率可达100%. 展开更多
关键词 Claus反应 湿混捏法 钴钼/氧化铝催化剂 加氢 水解 硫磺 二氧化硫 二硫化碳
下载PDF
助剂CeO_2对Co/Al_2O_3催化剂上F-T合成反应性能的影响 被引量:19
18
作者 代小平 余长春 沈师孔 《催化学报》 SCIE CAS CSCD 北大核心 2001年第2期104-108,共5页
在用于F T合成的Co/Al2 O3 催化剂中加入少量助剂 ,能够提高CO转化率和C5+ 烃选择性 .主要考察了助剂CeO2 添加量和催化剂焙烧温度等因素对F T合成反应的影响 ,并通过程序升温还原、程序升温氧化及X射线衍射等手段对催化剂进行了表征 .... 在用于F T合成的Co/Al2 O3 催化剂中加入少量助剂 ,能够提高CO转化率和C5+ 烃选择性 .主要考察了助剂CeO2 添加量和催化剂焙烧温度等因素对F T合成反应的影响 ,并通过程序升温还原、程序升温氧化及X射线衍射等手段对催化剂进行了表征 .结果表明 ,在Co/Al2 O3 催化剂中加入少量CeO2 (n(Ce) /n(Co) =0 1~ 0 14) ,能够有效提高催化剂的催化活性和C5+ 烃选择性 ;焙烧温度则以相反的趋势控制F T反应活性和链增长几率 ;助剂的加入降低了催化剂的起始还原温度 ,改善了催化剂的还原性能 .但是 ,催化剂的积碳量有所增加 ,经 10h反应后 ,催化剂上存在两种类型的积碳 . 展开更多
关键词 费-托合成 钴催化剂 氧化铝 程序升温还原 程序升温氧化 积碳 二氧化铈助剂 催化活性
下载PDF
Co-Mo/γ-Al_2O_3催化剂上煤焦油加氢裂化工艺 被引量:7
19
作者 潘海涛 高歌 +1 位作者 雷振 陆江银 《石油化工》 CAS CSCD 北大核心 2014年第5期517-522,共6页
以γ-Al2O3为载体,通过浸渍法制备了Co-Mo/γ-Al2O3催化剂,并用硫代硫酸铵对催化剂进行预硫化,在连续固定床反应器上考察了反应温度、重时空速和Mo负载量对低温煤焦油加氢裂化性能的影响.采用XRD,NH3-TPD,H2-TPR等手段对催化剂进行了表... 以γ-Al2O3为载体,通过浸渍法制备了Co-Mo/γ-Al2O3催化剂,并用硫代硫酸铵对催化剂进行预硫化,在连续固定床反应器上考察了反应温度、重时空速和Mo负载量对低温煤焦油加氢裂化性能的影响.采用XRD,NH3-TPD,H2-TPR等手段对催化剂进行了表征,并对加氢裂化轻质油进行了密度、黏度、元素分析、馏程和FTIR等测试.实验结果表明,煤焦油经加氢后,油品品质明显改善.在反应温度为450℃、重时空速为0.4 ~ 0.6 h-1、Mo负载量(w)为10%~ 12%的优化条件下,加氢裂化效果最为显著,轻质油(汽油馏分和柴油馏分)收率约为80%.煤焦油加氢裂化后,烯烃、芳烃和氧含量显著降低. 展开更多
关键词 煤焦油 加氢裂化 钴-钼 γ-氧化铝催化剂 预硫化
下载PDF
钴基F-T合成重质烃催化剂载体效应的研究 被引量:22
20
作者 张俊岭 陈建刚 +1 位作者 任杰 孙予罕 《催化学报》 SCIE CAS CSCD 北大核心 2001年第3期275-278,共4页
考察了ZrO2 ,Al2 O3 和SiO2 等载体对Co基催化剂上CO加氢反应性能的影响 .结果表明 ,载体的特性明显影响CO转化率、产物分布及链增长几率 .氧化态催化剂上的钴主要以Co3O4 形态存在 ,其晶粒大小的顺序为Co/ZrO2 <Co/SiO2 <Co/Al2 ... 考察了ZrO2 ,Al2 O3 和SiO2 等载体对Co基催化剂上CO加氢反应性能的影响 .结果表明 ,载体的特性明显影响CO转化率、产物分布及链增长几率 .氧化态催化剂上的钴主要以Co3O4 形态存在 ,其晶粒大小的顺序为Co/ZrO2 <Co/SiO2 <Co/Al2 O3.XPS测试结果表明 。 展开更多
关键词 费-托合成 钴基催化剂 氧化锆 氧化铝 氧化硅 载体 结构 重质烃 燃料 催化活性 天然气 加氢 一氧化碳
下载PDF
上一页 1 2 3 下一页 到第
使用帮助 返回顶部