Methane dehydroaromatization over Mo-modified H-MFI forgas to liquid catalysts |
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Authors: | Hirofumi Aritani Hiromi Shibasaki Hitoshi Orihara Atsushi Nakahira |
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Affiliation: | 1. Department of Applied Chemistry,Saitama Institute of Technology,Fukaya 369-0293,Japan 2. Graduate School of Engineering,Osaka Prefecture University,Sakai,Japan |
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Abstract: | For direct gas to liquid (GTL),a novel process producing energy sources for methane dehydroaromatization is needed.Supporting MoO3 on H-MFI zeolite shows the high catalytic capacity and a selective activity for dehydroaromatization of methane to benzene at 973 K in a fixed bed reactor.On the other hand,deactivation by coke on the active sites in all the catalysts is formed during the reaction.H2 co-feed suppressed the deactivation,which is probably due to the decrease in coking amount.Mo K-edge X-ray absorption fine structure (XAFS) results showed the formation of dispersed Mo2C species with low crystallinity after dehydroaromatization.Mo L-edge XANES (X-ray absorption near-edge structure) indicated the formation of active Mo species including Mo2C and Mo-oxycarbide (MoOxCy),where the red-ox state should be independent in the absence/presence of H2.It is concluded that Mo-oxycarbide species act as highly active species,and their stability affected the durable activity in the presence of H2. |
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Keywords: | direct gas to liquid methane dehydroaromatization Mo/H-MFI L-XANES K-XAFS |
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