Insight into the Dual Cycle Mechanism of Methanol-to-Olefins Reaction over SAPO-34 Molecular Sieve by Isotopic Tracer Studies

doi:10.1007/s40242-020-0216-x

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (6): 1203-1208.doi: 10.1007/s40242-020-0216-x

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Insight into the Dual Cycle Mechanism of Methanol-to-Olefins Reaction over SAPO-34 Molecular Sieve by Isotopic Tracer Studies

YU Bowen^1,2, LOU Caiyi^1,2, ZHANG Wenna¹, XU Shutao¹, HAN Jingfeng¹, YU Zhengxi¹, WEI Yingxu¹, LIU Zhongmin¹

1. National Engineering Laboratory for Methanol to Olefins, Dalian National Laboratory for Clean Energy, iChEM(Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China;
2. University of Chinese Academy of Sciences, Beijing 100039, P. R. China

Received:2020-06-29 Revised:2020-08-03 Online:2020-12-01 Published:2020-12-03
Contact: WEI Yingxu, LIU Zhongmin E-mail:weiyx@dicp.ac.cn;liuzm@dicp.ac.cn
Supported by:
Supported by the National Key R&D Program of China(No.2018YFB0604901), the National Natural Science Foundation of China(Nos.21991090, 21991092, 21972142, 91834302, 91745109), the Liaoning Revitalization Talents Program, China(Nos. XLYC1808014, XLYC1807227), the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2014165), the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(Nos.QYZDY-SSW-JSC024, QYZDB-SSWSLH026), the International Partnership Program of the Chinese Academy of Sciences(No.121421KYSB20180007) and the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA21030200).

Abstract

Abstract: Methanol-to-olefins(MTO) reaction is one of the important non-petroleum routes to produce light olefins over acidic molecular sieves. In this study, the complete reaction course of MTO on SAPO-34 molecular sieve with retained organics evolution from induction period to deactivation period was investigated systematically at different weight hourly space velocities(WHSV) of methanol. By the aid of ¹²C/¹³C-methanol isotopic switch experiment, the dual cycle mechanism involving aromatics-based cycle and alkenes-based cycle was evaluated during the whole reaction process. The detailed reaction route varied with the evolution of the retained organics in the catalyst at different reaction stages. The aromatics-based cycle and alkenes-based cycle alternately dominate the reaction process. In the efficient reaction period, aromatics-based cycle is the main reaction mechanism, while in the induction and deactivation periods, the contribution of alkenes-based cycle mechanism will become more important.

Key words: SAPO-34, Methanol-to-olefin(MTO), Polymethylbenzene, Dual-cycle mechanism, Isotopic tracer

YU Bowen, LOU Caiyi, ZHANG Wenna, XU Shutao, HAN Jingfeng, YU Zhengxi, WEI Yingxu, LIU Zhongmin. Insight into the Dual Cycle Mechanism of Methanol-to-Olefins Reaction over SAPO-34 Molecular Sieve by Isotopic Tracer Studies[J]. Chemical Research in Chinese Universities, 2020, 36(6): 1203-1208.

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Insight into the Dual Cycle Mechanism of Methanol-to-Olefins Reaction over SAPO-34 Molecular Sieve by Isotopic Tracer Studies

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