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Insight into the effect of incorporation of boron in ZSM-11 on its catalytic performance for conversion of methanol to olefins

Abstract

A series of ZSM-11 zeolites was synthesized by adding different amounts of boron in the synthesis gel for the purpose of improving its catalytic performance for conversion of methanol to olefins (MTO). It was found that boron has marginal effects on the crystal structure, texture properties and acid site strength of ZSM-11, but it significantly increases catalytic stability and hydride transfer activity that results in an increase in the amounts of aromatics and alkane in products. DFT calculations revealed that aluminum and boron atoms competitively insert in the ZSM-11 framework. In combination with 27Al MAS NMR, GC-MS, m-xylene isomerization and Co2+-exchanged ZSM-11 diffuse reflectance UV-vis spectroscopy results, it can be deduced that incorporation of boron compels some aluminum atoms to the intersection T sites, which can greatly alleviate coking process although it allows forming more bulky molecules. This shows that the MTO catalytic performance of ZSM-11 can be largely adjusted by changing the amount of incorporated boron through regulation of aluminum or acid site locations in the framework.

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Publication details

The article was received on 16 Jul 2017, accepted on 11 Sep 2017 and first published on 12 Sep 2017


Article type: Paper
DOI: 10.1039/C7CY01428G
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Insight into the effect of incorporation of boron in ZSM-11 on its catalytic performance for conversion of methanol to olefins

    S. Wang, S. Li, L. Zhang, Z. Qin, M. Dong, J. Li, J. Wang and W. Fan, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY01428G

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