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题名: Effects of steam treatment on acidity of ZSM-5 and its catalytic performance in butene cracking
作者: Zhu, XX;  Zhang, SB;  Qian, XH;  Niu, XL;  Song, YQ;  Liu, SL;  Xu, LY
关键词: ZSM-5 zeolite ;  steam treatment ;  butene cracking ;  propylene ;  ethylene
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2004-07-01
卷: 25, 期:7, 页:571-576
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Propylene is one of the fastest growing petrochemicals, driven primarily by the high growth rate of polypropylene. The traditional methods to produce propylene cannot satisfy its demand. To increase the production of propylene, the catalytic cracking of low value C4+ hydrocarbons, by-products of petrochemical industry, to propylene and ethylene was investigated. The ZSM-5 zeolite was modified by steam treatment at different temperatures and for different time, and its acidity was measured by NH3-TPD technique. With increasing treatment temperature and time, the acid density and the acid strength of ZSM-5 decreased. When used as a catalyst for butene cracking, the ZSM-5 with low acid density and weak acid strength was favorable to enhance the yield of propylene plus ethylene, besides decreased the production of aromatics and low carbon paraffins. By leaching out the non-skeletal Al produced by the steam treatment with citric acid, the pore volume of ZSM-5 was enlarged and had a better capacity of accommodating the carbon deposit so that the catalyst life was prolonged. The yield of propylene plus ethylene could be enhanced if the reaction conditions were properly selected, as well as the yield of aromatics and paraffins could be decreased. The optimum conditions were as follows: WHSV = 3.5similar to8.8 h(-1), p = 0.06similar to0.1 MPa and theta = 600similar to620 degreesC.
语种: 英语
WOS记录号: WOS:000223181200014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138453
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Liaoning, Peoples R China
2.CNPC, Fushun Petrochem Co, Fushun 113008, Liaoning, Peoples R China

Recommended Citation:
Zhu, XX,Zhang, SB,Qian, XH,et al. Effects of steam treatment on acidity of ZSM-5 and its catalytic performance in butene cracking[J]. CHINESE JOURNAL OF CATALYSIS,2004,25(7):571-576.
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