Relevance of the Mo-precursor State in H-ZSM-5 for the Methane Dehydroaromatization

by 2. I. Vollmer, G. Li, I. Yarulina, N. Kosinov, E. Hensen, K. Houben, D. Mance, M. Baldus, J. Gascon, F. Kapteijn
Year: 2018 ISSN: DOI: 10.1039/C7CY01789H

Bibliography

I. Vollmer, G. Li, I. Yarulina, N. Kosinov, E. Hensen, K. Houben, D. Mance, M. Baldus, J. Gascon, F. Kapteijn, Catal. Sci. Technol., 8 (2018) 916 - 922, Relevance of the Mo-precursor State in H-ZSM-5 for the Methane Dehydroaromatization

Abstract

​While the local geometry of Mo in Mo/HZSM-5 has been characterized before, we present a systematic way to manipulate the configuration of Mo and link it to its catalytic properties. The location and geometry of cationic Mo-complexes , the precursor of the active metal site for Methane Dehydroaromatization, is altered by directing the way they anchor to the framework of the zeolite. The handle used to direct the anchoring of Mo is the location of Al in the zeolite framework. According to DFT calculations, the local geometry of Mo should change, while UV-Vis and Pyridine FTIR indicated differences in the dispersion of Mo. Both aspects, however, did not influence the catalytic behavior of Mo/HZSM-5, indicating that as long as enough isolated Mo species are present inside the pores of the zeolite, catalytic behavior is unaffected. This paves the way to better understand how the Mo oxo precursor transforms to the active phase at reaction conditions

Keywords

Methane dehydroaromatization ZSM-5 Acid Catalysis Al distribution