Mechanisms of Brönsted and Lewis acids of zeolite on pentenes conversion by <i>in situ</i> DRIFTS

YI Feng-jiao; CHEN Hui-min; YANG Yong; CAO Jing-pei

doi:10.19906/j.cnki.JFCT.2022083

Volume 51 Issue 5

May 2023

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Article Navigation > Journal of Fuel Chemistry and Technology > 2023 > 51(5): 625-634

YI Feng-jiao, CHEN Hui-min, YANG Yong, CAO Jing-pei. Mechanisms of Brönsted and Lewis acids of zeolite on pentenes conversion by in situ DRIFTS[J]. Journal of Fuel Chemistry and Technology, 2023, 51(5): 625-634. doi: 10.19906/j.cnki.JFCT.2022083

Citation:

YI Feng-jiao, CHEN Hui-min, YANG Yong, CAO Jing-pei. Mechanisms of Brönsted and Lewis acids of zeolite on pentenes conversion by in situ DRIFTS[J]. Journal of Fuel Chemistry and Technology, 2023, 51(5): 625-634. doi: 10.19906/j.cnki.JFCT.2022083

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Mechanisms of Brönsted and Lewis acids of zeolite on pentenes conversion by in situ DRIFTS

doi: 10.19906/j.cnki.JFCT.2022083

1.
Jiangsu Province Engineering Research Center of Fine Utilization of Carbon Resources, China University of Mining & Technology, Xuzhou 221116, China
2.
Chemistry and Chemical Engineering Guangdong Laboratory, Shantou 515031, China
3.
National Energy Center for Coal to Liquids, Synfuels China Co. Ltd, Beijing 101407, China

Funds: The project was supported by the National Natural Science Foundation of China (22208370), China Postdoctoral Science Foundation (2021M703500) and Jiangsu Funding Program for Excellent Postdoctoral Talent (2022ZB514).

Received Date: 2022-10-09
Accepted Date: 2022-11-08
Rev Recd Date: 2022-10-30

Available Online: 2022-11-16

Publish Date: 2023-05-15

Abstract

Abstract

Zeolites have been extensively used in the chemical and petrochemical industries owing to their tunable acidities and unique pore structures. Beta zeolite with Brönsted and Lewis acids and AlCl₃@Si-Beta with only Lewis acid were prepared by hydrothermal synthesis and gas-phase impregnation methods, respectively. Mechanisms differences of Brönsted and Lewis acids on four pentene isomers transformation were investigated by in situ diffraction infrared Fourier transform spectrum (DRIFTS). The results suggested that Brönsted in Beta played a main role in isomerization and oligomerization reactions which all followed classical carbenium ion mechanisms. On the contrary, Lewis acid in AlCl₃@Si-Beta without hydrogen proton or hydroxyl catalyzed α-pentene double-bond migration to produce β-pentene and cis-trans isomerization reaction of 2-pentene by AB-AD mechanism with allyl-like species as intermediates, and could not catalyze pentenes skeletal isomerization and oligomerization reactions.
- zeolite,
- Brönsted acid,
- lewis acid,
- pentene isomers,
- mechanism

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References(33)

References

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