Effect of Pt on stability of nano-scale ZSM-5 catalyst for toluene alkylation with methanol into p-xylene
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Zhao, Yan
- 通讯作者：
- Guo, XW (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Dept Catalysis Chem & Engn, Sch Chem Engn, POB 39,158 Zhongshan Rd, Dalian 116012, Liaoning, Peoples R China.
- 合写作者：
- Tan, Wei,Wu, Hongyu,Zhang, Anfeng,Liu, Min,Li, Guimin,Wang, Xiangsheng,Song, Chunshan,Guo, Xinwen
- 发表时间：
- 2011-02-02
- 发表刊物：
- CATALYSIS TODAY
- 收录刊物：
- Scopus、SCIE、EI
- 文献类型：
- J
- 卷号：
- 160
- 期号：
- 1
- 页面范围：
- 179-183
- ISSN号：
- 0920-5861
- 关键字：
- Shape-selective; Nano-scale HZSM-5; Pt; Hydrogenation; Stability
- 摘要：
- Shape-selective methylation of toluene (T) with methanol (M) was carried out in continuous flow fixed-bed reactor over Pt-modified nano-scale HZSM-5 catalysts, and excellent stability was obtained. Even after 500 h on stream, toluene conversion of 22.0-23.0% was achieved simultaneously with the para-selectivity of >98%. The presence of Pt on the modified nano-scale HZSM-5 solves the apparent paradox of high para-selectivity and low stability. Catalysts were characterized by using X-ray diffraction (XRD), temperature programmed desorption of ammonia (NH(3)-TPD), Pyridine IR (Py-IR), TG-SDTA, scanning electron microscope (SEM), etc. The results show that significant enhancement in stability over Pt-modified nano-scale HZSM-5 catalysts is mainly due to good hydrogenation properties of Pt particles. (C) 2010 Elsevier B.V. All rights reserved.
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