Characterization and catalytic alkylation of hydrothermally dealuminated nanoscale ZSM-5 zeolite catalyst
发表时间：2019-03-10
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- 论文类型：
- 期刊论文
- 第一作者：
- Ding, Chunhua
- 通讯作者：
- Wang, XS (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116012, Peoples R China.
- 合写作者：
- Wang, Xiangsheng,Guo, Xinwen,Zhang, Shuguang
- 发表时间：
- 2008-03-15
- 发表刊物：
- CATALYSIS COMMUNICATIONS
- 收录刊物：
- SCIE、EI
- 文献类型：
- J
- 卷号：
- 9
- 期号：
- 4
- 页面范围：
- 487-493
- ISSN号：
- 1566-7367
- 关键字：
- nanoscale ZSM-5 zeolite; hydrothermal treatment; toluene alkylation with methanol; para-Xylene
- 摘要：
- The acidity and pore structure of nanoscale ZSM-5 zeolite catalysts with both alumina and rare earth as binders and treated by pure steam were studied by various techniques, including X-ray diffraction (XRD), Ammonia Temperature Programmed Desorption (NH3-TPD), Fourier-transform infrared spectroscopy (FT-IR) of adsorbed pyridine, modified Hammett indicator, Al-27 MAS NMR spectroscopy, low temperature NZ adsorption and adsorption of hexane and cyclohexane. The catalytic performance of the catalysts was investigated using alkylation of toluene with methanol and ethylbenzene with ethanol as probe reactions. The results indicated that the nanoscale ZSM-5 catalysts treated at temperatures up to 800 degrees C maintained good crystallinity. Both the amount of the tetrahedrally coordinated framework aluminum and that of the octahedrally coordinated nonframework aluminum decreased; the average pore diameter increased; and the adsorption capacities for normal hexane and cyclohexane declined on the dealuminated nanoscale ZSM-5 catalyst samples. For the catalyst treated at 700 degrees C, not only the catalytic activity for the alkylation of toluene with methanol was improved, but was the selectivity of para-xylene, although the total acid amount decreased significantly and strong acid sites almost disappeared. The alkylation activity was very low when the hydrothermal treatment temperature was 800 degrees C. Correspondingly, the activity of the catalysts for the alkylation of ethylbenzene with ethanol decreased with elevated treatment temperatures. (C) 2007 Elsevier B.V. All rights reserved.
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