Abstract
The selective modification of the external surface of HZSM-5 by large organometallic complexes was used to reduce the densities of external acid sites and MoO x species retained at external surfaces during the exchange process. The amounts of acid sites and the catalytic properties for non-oxidative aromatization of methane over modified and unmodified samples were studied by NH 3-TPD, FT-IR of d 3-acetonitrile adsorption, and TGA measurements. It was found that acid sites and active MoO x species mainly located within the channels of the modified zeolites, and these modified Mo/HZSM-5 catalysts showed higher shape-selectivity to major product benzene and lower formation rates and selectivities for large hydrocarbons that normally cause the deactivation of catalysts.
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