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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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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.

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Authors and Affiliations

  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

    Bowen Yu, Caiyi Lou, Wenna Zhang, Shutao Xu, Jingfeng Han, Zhengxi Yu, Yingxu Wei & Zhongmin Liu

  2. University of Chinese Academy of Sciences, Beijing, 100039, P. R. China

    Bowen Yu & Caiyi Lou

Authors
  1. Bowen Yu
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  2. Caiyi Lou
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  3. Wenna Zhang
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  4. Shutao Xu
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  5. Jingfeng Han
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  6. Zhengxi Yu
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  7. Yingxu Wei
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  8. Zhongmin Liu
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Corresponding authors

Correspondence to Yingxu Wei or Zhongmin Liu.

Additional information

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-SSW-SLH026), 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).

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40242_2020_216_MOESM1_ESM.pdf

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

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Yu, B., Lou, C., Zhang, W. et al. Insight into the Dual Cycle Mechanism of Methanol-to-Olefins Reaction over SAPO-34 Molecular Sieve by Isotopic Tracer Studies. Chem. Res. Chin. Univ. 36, 1203–1208 (2020). https://doi.org/10.1007/s40242-020-0216-x

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  • DOI: https://doi.org/10.1007/s40242-020-0216-x

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