| 亚微米ZSM-5催化剂上乙醇脱水及积炭演变过程 |
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| 引用本文： | 王飞,罗漫,肖文德. 亚微米ZSM-5催化剂上乙醇脱水及积炭演变过程[J]. 石油学报(石油加工), 2011, 27(5): 712-718. DOI: 10.3969/j.issn.1001-8719.2011.05.009 |
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| 作者姓名： | 王飞 罗漫 肖文德 |
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| 作者单位： | 1. 华东理工大学;2. 上海交通大学; |
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| 摘 要： | 研究了固定床反应器中乙醇催化脱水过程中亚微米 ZSM-5分子筛催化剂的积炭过程。采用热重分析、氮吸附 脱附、X射线衍射和核磁共振等方法对催化剂进行了表征，考察了积炭随反应时间的演变过程及其对催化剂性质的影响。结果表明，催化剂积炭量在反应初期增长较快，之后近似呈线性缓慢增长。随着反应时间延长，积炭的不饱和度越来越高，向多环芳烃化合物演变。短期内积炭对催化剂催化乙醇脱水的活性影响很小，410 h 内乙醇转化率和乙烯选择性均达到99%以上。在乙醇催化脱水反应初期，由于积炭堵塞孔道，亚微米 ZSM-5分子筛催化剂比表面积和孔体积下降较快，之后缓慢降低。积炭也导致亚微米 ZSM-5分子筛催化剂晶系由正交晶系转变为四方晶系。催化剂脱铝随着反应时间的延长愈加严重。
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| 关 键 词： | ZSM-5分子筛 亚微米 乙醇脱水 积炭演变 |
| 收稿时间： | 2010-10-11 |
| 修稿时间： | 2010-12-24 |
Ethanol Dehydration and Coke Evolution on a Submicron ZSM-5 Zeolite |
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| WANG Fei,LUO Man,XIAO Wende. Ethanol Dehydration and Coke Evolution on a Submicron ZSM-5 Zeolite[J]. Acta Petrolei Sinica (Petroleum Processing Section), 2011, 27(5): 712-718. DOI: 10.3969/j.issn.1001-8719.2011.05.009 |
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| Authors: | WANG Fei LUO Man XIAO Wende |
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| Affiliation: | WANG Fei1,LUO Man2,XIAO Wende1,2(1.State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China,2.School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China) |
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| Abstract: | Coke deposition on a submicron ZSM-5 catalyst during ethanol catalytic dehydration in a fix-bed reactor was studied.TG,N2 adsorption-desorption,XRD and NMR techniques were employed to investigate the evolution of coke and its influence on catalyst properties.The experimental results showed that the coke content increased quickly at the beginning and linearly with time on stream afterward.The unsaturated degree of the coke increased with the reaction time and the coke evolved toward polycyclic aromatic hydro... |
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| Keywords: | ZSM-5 zeolite submicron ethanol dehydration coke evolution |
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