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Issue 21, 2018
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On the dynamic nature of Mo sites for methane dehydroaromatization

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Abstract

The mechanism of methane activation on Mo/HZSM-5 is not yet fully understood, despite the great interest in methane dehydroaromatization (MDA) to replace aromatics production in oil refineries. It is difficult to assess the exact nature of the active site due to fast coking. By pre-carburizing Mo/HZSM-5 with carbon monoxide (CO), the MDA active site formation was isolated from coke formation. With this a clear 13C NMR signal solely from the active site and not obscured by coke was obtained, and it revealed two types of likely molecular Mo (oxy-)carbidic species in addition to the β-Mo2C nanoparticles often mentioned in the literature. Furthermore, separating the active site formation from coking by pre-carburization helped us examine how methane is activated on the catalytic site by carrying out MDA using isotopically labelled methane (13CH4). Carbon originating from the pre-formed carbide was incorporated into the main products of the reaction, ethylene and benzene, demonstrating the dynamic behavior of the (oxy-)carbidic active sites.

Graphical abstract: On the dynamic nature of Mo sites for methane dehydroaromatization

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Supplementary files

Article information


Submitted
18 Mar 2018
Accepted
29 Apr 2018
First published
30 Apr 2018

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2018,9, 4801-4807
Article type
Edge Article

On the dynamic nature of Mo sites for methane dehydroaromatization

I. Vollmer, B. van der Linden, S. Ould-Chikh, A. Aguilar-Tapia, I. Yarulina, E. Abou-Hamad, Y. G. Sneider, A. I. Olivos Suarez, J. Hazemann, F. Kapteijn and J. Gascon, Chem. Sci., 2018, 9, 4801
DOI: 10.1039/C8SC01263F

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