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Cited by 438

The DOI matches its Crossref record; 58 of the 58 references it cites were found in a registry or an index.

Conversion of Methanol to Olefins over H-ZSM-5 Zeolite: Reaction Pathway Is Related to the Framework Aluminum Siting

Open access
Liang, Tingyu, Chen, Jialing, Qin, Zhangfeng, Li, Junfen, Wang, Pengfei, Wang, Sen, Wang, Guofu, Dong, Mei, Fan, Weibin, Wang, Jianguo·2016·ACS Catalysis
DOI 10.1021/acscatal.6b01771
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Abstract

Abstract As the conversion of methanol to olefins (MTO) over a zeolite catalyst is conducted on acid sites derived from framework aluminum (AlF), it is possible to enhance the catalytic performance by altering the siting of AlF if one knows the catalytic behavior of specified AlF located at certain sites. In this work, two series of H-ZSM-5 zeolites, viz., S-HZ-m and T-HZ-m, were synthesized with silica sol and tetraethyl orthosilicate, respectively, as the silicon source. Both series of H-ZSM-5 zeolites exhibit similar acidity, morphology, and textual properties. However, they are quite different with respect to AlF siting, as determined by UV–vis–DRS of Co(II) ions and 27Al MAS NMR; AlF of S-HZ-m is enriched in the sinusoidal and straight channels, whereas AlF of T-HZ-m is concentrated in the channel intersections. When they are used as the catalyst in MTO, T-HZ-m gives higher selectivity to ethene and aromatics and a larger hydrogen transfer index (HTI) than S-HZ-m, whereas S-HZ-m exhibits higher selectivity to propene and higher olefins. Moreover, the 13C/12C-methanol-switching experiments indicate that the incorporation of 12C into pentamethylbenzene and hexamethylbenzene is faster on T-HZ-m, whereas the scramble of 12C for C3–C5 olefins is speedier on S-HZ-m. All of these illustrate that AlF in the channel intersections of H-ZSM-5 is probably more favorable to the propagation of the aromatic-based cycle, whereas AlF in the sinusoidal and straight channels is more encouraging for the alkene-based cycle. These results help to clarify the catalytic behavior of given framework acid sites of H-ZSM-5 in MTO and then bring forward an effective approach to improving the catalytic performance by regulating the framework aluminum siting.

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Metadata

Authors
Liang, T., Chen, J., Qin, Z., Li, J., Wang, P., Wang, S., Wang, G., Dong, M., Fan, W., & Wang, J.
Venue
ACS Catalysis
Publisher
American Chemical Society (ACS)
Published
2016-09-30
Volume
6
Issue
11
Pages
7311-7325
ISSN
2155-5435 (ISSN-L)
DOI
10.1021/acscatal.6b01771
OpenAlex
W2522322289
Cited by
438
References
58
FWCI
13.53
Type
journal article
Language
en
Open access
hybrid

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