XPS AND FTIR STUDIES OF Mo/ZSM-5 CATALYSTS FOR NONOXIDATIVE CONVERSION OF METHANE TO AROMATICS

H. Y. Chen, S. Tang, Z. Y. Zhong, J. Lin () and K. L. Tan
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H. Y. Chen: Surface Science Centre, Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
S. Tang: Surface Science Centre, Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
Z. Y. Zhong: Surface Science Centre, Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
J. Lin: Surface Science Centre, Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
K. L. Tan: Surface Science Centre, Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore

Surface Review and Letters (SRL), 2001, vol. 08, issue 06, 627-632

Abstract: In this investigation, several Mo/ZSM-5 catalysts with various Mo loadings and various reaction times were prepared, and methane conversion to aromatics without the presence of oxygen was studied by microreactor evaluation, FTIR and XPS. It was found, for the first time, that oxygen treatment before the reaction could shorten the induction period of this reaction.In situFTIR study indicated the formation of${\rm O}_2^{2-}$species (888 cm-1) and O–Al (670 cm-1) on the surface of the catalyst as a result of the oxygen treatment. The two IR bands shifted to 854 and659 cm-1respectively when18O2was used. These oxygen species may take part in the initial reaction and shorten the induction time. The XPS study revealed the coexistence ofMo2CandMoO3species on working catalyst surfaces, and a properMo2C/MoO3ratio (~0.38) was identified for the best aromatization Mo/ZSM-5 catalyst. The active sites for methane conversion to aromatics should include Mo oxide as well as Mo carbide.

Date: 2001
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DOI: 10.1142/S0218625X0100152X

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