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Issue 14, 2016
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The nature of the selective species in Fe-HZSM-5 for non-oxidative methane dehydroaromatization

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Abstract

Conversion of natural gas to aromatics via non-oxidative dehydroaromatization (DHA) is a promising route to replace oil with a cheap and abundant domestic resource as feed-stock for the petrochemical industry. However, the reaction is still lacking a suitable catalyst system to-date. We present results from a study into the nature of the active species in Fe-containing HZSM-5 catalysts through the preparation of Fe-HZSM-5 via three different synthetic approaches: isomorphous substitution, wet ion exchange, and core–shell synthesis. By carefully investigating the impact of the preparation methods on the distribution of Fe species, and studying the catalytic performance of the resulting materials in methane DHA, we show that coking is reduced with increasing Fe dispersion and that highly (atomically) dispersed Fe2+ inside the zeolite micropores constitutes the selective species for DHA. However, the presence of Brønsted acid sites in the zeolite micropores results in continued coke formation due to secondary reactions of the aromatic product. Further optimization of the catalyst hence requires careful adjustment of this acidity.

Graphical abstract: The nature of the selective species in Fe-HZSM-5 for non-oxidative methane dehydroaromatization

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Supplementary files

Article information


Submitted
24 Dec 2015
Accepted
29 Mar 2016
First published
30 Mar 2016

Catal. Sci. Technol., 2016,6, 5440-5452
Article type
Paper

The nature of the selective species in Fe-HZSM-5 for non-oxidative methane dehydroaromatization

Y. Lai and G. Veser, Catal. Sci. Technol., 2016, 6, 5440
DOI: 10.1039/C5CY02258D

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