Characterization of surface carbon formed during the conversion of methane to benzene over Mo/H-ZSM-5 catalysts
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During the conversion of methane to benzene in the absence of oxygen over a 2 wt% Mo/H-ZSM-5 catalyst at 700C, three different types of surface carbon have been observed by X-ray photoelectron spectroscopy: adventitious or graphitic-like C (284.6 eV), carbidic-like C (282.7 eV), and hydrogen-poor sp-type C (283.2 eV), where the C 1s binding energies for the respective forms of carbon are given in parentheses. Pretreatment of the catalyst at 700C in CO also resulted in a strong signal at 283.2 eV; thus, the species responsible for this signal appears to be different from the usual aromatic-type coke. The coke with dominantly sp hybridization is concentrated on the external surface of the zeolite and is responsible for the gradual deactivation of the catalyst.
author list (cited authors)
Weckhuysen, B. M., Rosynek, M. P., & Lunsford, J. H.
complete list of authors
Weckhuysen, BM||Rosynek, MP||Lunsford, JH