文献类型：期刊文献

英文题名：Effect of iron and phosphorus on HZSM-5 in catalytic cracking of 1-butene

作者：Li, Jianwen[1];Ma, Hongfang[1];Sun, Qiwen[2];Ying, Weiyong[1];Fang, Dingye[1]

机构：[1]E China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, State Key Lab Chem Engn, Minist Educ, Shanghai 200237, Peoples R China;[2]State Key Lab Coal Liquefact & Coal Chem Technol, Shanghai 201203, Peoples R China

年份：2015

卷号：134

起止页码：32

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：20150600503344);WOS:【SCI-EXPANDED(收录号:WOS:000353739200005)】；

语种：英文

外文关键词：Butene; Catalytic cracking; Propylene; Modification; HZSM-5

摘要：HZSM-5 zeolites modified by phosphorus and/or iron were prepared. The physicochemical features of catalysts were characterized by XRD, N-2 adsorption, Al-27 MAS NMR, UV-vis, NH3-TPD, FTIR of adsorbed pyridine and CO2-TPD, and their performance for the cracking of 1-butene was measured. It was found that phosphorus modification significantly reduced the concentration of acid sites, especially strong ones. This suppressed hydrogen transfer reactions and enhanced the selectivity to propylene, while decreasing the butene conversion. Phosphorus modification also promoted the stability of the catalyst. Iron modification led to relatively little change on the acidity of the catalyst. However, the basicity increased after the introduction of iron. Accordingly, iron modification also suppressed hydrogen transfer reactions. After adding iron into phosphorus modified HZSM-5, the interaction between iron and phosphorus released some Bronsted acid sites which were previously neutralized by phosphate, increasing butene conversion and propylene selectivity compared with phosphorus modified HZSM-5. The presence of phosphorus promoted the dispersion of iron cations. Highest selectivity to propylene was observed on the catalyst co-modified by iron and phosphorus. (C) 2014 Elsevier B.V. All rights reserved.