Methane dehydroaromatization over Mo-modified H-MFI forgas to liquid catalysts
Hirofumi Aritani , Hiromi Shibasaki , Hitoshi Orihara , Atsushi Nakahira
DOI:
Received ,Revised , Accepted , Available online
Volume 21,2009,Pages 736-740
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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 LIIIedge
XANES (X-ray absorption near-edge structure) indicated the formation of active Mo species including Mo2C and Mo-oxycarbide
(MoOxCy), where the redox 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 a ected the durable activity in the presence of H2.
