Effects of steam and TEOS modification on HZSM-5 zeolite for 2,6-dimethylnaphthalene synthesis by methylation of 2-methylnaphthalene with methanol
发表时间：2019-03-11
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- 论文类型：
- 期刊论文
- 第一作者：
- Zhang, Chen
- 通讯作者：
- Guo, XW (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Sch Chem Engn, POB 39,158 Zhongshan Rd, Dalian 116012, Peoples R China.
- 合写作者：
- Guo, Xinwen,Song, Chunshan,Zhao, Shuqi,Wang, Xiangsheng
- 发表时间：
- 2010-01-15
- 发表刊物：
- International Symposium on Catalysis
- 收录刊物：
- SCIE、EI、CPCI-S
- 文献类型：
- J
- 卷号：
- 149
- 期号：
- 1-2
- 页面范围：
- 196-201
- ISSN号：
- 0920-5861
- 关键字：
- 2,6-Dimethylnaphthalene; HZSM-5; TEOS; Steam; Modification
- 摘要：
- Shape-selective methylation of 2-methylnaphthalene (2-MN) over HZSM-5 catalysts modified by steam and tetraethoxysilane (TEOS) treatments was carried out in a fixed-bed reactor Catalysis were characterized by XRD, NH(3)-TPD, BEL FT-IR spectra of pyndine adsorbed, and by adsorption of hexane and cyclohexane. The results show that the TEOS treatment can effectively passivate external active site and narrow pore mouth of catalyst. but it has less effect on I he internal surface than steam modification. Hydrothermal treatment can effectively reduce both external and internal acid sites, and adjust channel of catalyst Steam treatment can effectively increase the ratio of 2.6/2,7-DMN, but the ratio has no increasing trend on TEOS modified catalyst. So adjusting acidity property is more useful to increase the selectivity to 2,6-DMN and the ratio of 2,6/2,7-DMN than narrowing catalyst pore mouth. Tailoring acidic characteristics is more important than spatial control for distinguishing between 2,6-DMN and 2,7-DMN. (C) 2009 Elsevier B.V. All rights reserved.
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- 否
