Unique structure of fibrous ZSM-5 catalyst expedited prolonged hydrogen atom restoration for selective production of propylene from methanol

被引：29

作者：

Hambali, H. U. ^{[1
,4
]}

Jalil, A. A. ^{[1
,2
]}

Triwahyono, S. ^{[3
]}

Jamian, S. F. ^{[3
]}

Fatah, N. A. A. ^{[1
]}

Abdulrasheed, A. A. ^{[1
]}

Siang, T. J. ^{[1
]}

机构：

[1] Univ Teknol Malaysia, Fac Engn, Sch Chem & Energy Engn, Utm Johor Bahru 81310, Johor, Malaysia

[2] Univ Teknol Malaysia, Inst Future Energy, Ctr Hydrogen Energy, Utm Johor Bahru 81310, Johor, Malaysia

[3] Univ Teknol Malaysia, Fac Sci, Utm Johor Bahru 81310, Johor, Malaysia

[4] Univ Ilorin, Dept Chem Engn, PMB 1515, Ilorin, Nigeria

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2021年 / 46卷 / 48期

关键词：

Fibrous HSi@ZSM-5; Methanol dehydration; Propylene; Surface methoxy species; REACTION-MECHANISM; ZEOLITE H-ZSM-5; CONVERSION; OLEFINS; PERFORMANCE; HYDROCARBONS; TRANSFORMATION; DESILICATION; INSIGHTS; CRYSTALS;

D O I：

10.1016/j.ijhydene.2019.11.236

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 ; 081704 ;

摘要：

A unique mesostructured fibrous silica@ZSM-5 (HSi@ZSM-5) catalyst was synthesized via microemulsion ZSM-5 zeolite seed assisted synthesis method and successfully applied in enhanced propylene formation in methanol to olefin (MTO) process. Characterization of the catalysts were carried out by FESEM, TEM, XRD, TGA, N-2 adsorption-desorption, NH3 and KBr probed FTIR. Catalytic performance of as-synthesized catalyst was examined using a micro-pulse reactor and compared with the commercial HZSM-5. The reaction mechanism was elucidated by in-situ methanol FTIR spectroscopy. It was found that HSi@ZSM-5 produced higher propylene selectivity (56%) and was stable for long time on stream (80 h), nearly three-fold higher than that of commercial HZSM-5. In addition, HSi@ZSM-5 displayed higher rate of methanol dehydration, surface methoxy species generation and olefin methylation, indicating that alkene catalytic cycle is the dominant reaction mechanism. The higher selectivity towards propylene was correlated to the existence of moderate acidity which impeded the formation of paraffins and polymethylbenzene intermediates. These observations are further supported by KBr probed FTIR findings which revealed negligible paraffinic carbon species on HSi@ZSM-5. Thus, the unique fibrous silica@ZSM-5 retarded coke deposition due to suppression of undesired side reactions thereby signifying intensified propylene formation, which is highly desirable in commercial MTO processes. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：24652 / 24665

页数：14

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