Understanding the enhancement of catalytic performance for olefin cracking: Hydrothermally stable acids in P/HZSM-5

被引：331

作者：

Xue, Nianhua

Chen, Xiangke

Nie, Lei

Guo, Xuefeng

Ding, Weiping ^{[1
]}

Chen, Yi

Gu, Min

Xie, Zaiku

机构：

[1] Nanjing Univ, Sch Chem & Chem Engn, Lab Mesoscop Chem, Nanjing 210093, Peoples R China

[2] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China

[3] Shanghai Res Inst Petrochem Technol, Shanghai 201208, Peoples R China

来源：

JOURNAL OF CATALYSIS | 2007年 / 248卷 / 01期

基金：

中国国家自然科学基金;

关键词：

P/HZSM-5; hydrothermal stability; D-2/OH exchange; olefin cracking;

D O I：

10.1016/j.jcat.2007.02.022

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 [物理化学]; 081704 [应用化学];

摘要：

Enhanced catalytic performance for C-4 olefin cracking to propene and ethene was observed on phosphorus-modified HZSM-5 treated in steam at 1073 K. Combining the results of P-31 and Al-27 MAS NMR, D-2/OH exchange, NH3-TPD, and catalytic performance of the catalysts, it seems reasonable to conclude that new and hydrothernially stable acid sites are formed during the steam treatment through the interaction of phosphorus species with silanol nests exposed on the zeolite due to dealumination. It is tentatively suggested that the incorporated phosphorous species stabilized by some nonframework aluminum species are responsible for both the enhanced acid stability and the significantly improved catalytic performance for the cracking of C-4 olefin. (C) 2007 Elsevier Inc. All rights reserved.

引用

页码：20 / 28

页数：9

共 44 条

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