Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 21, Issue 6, Pages 736-740Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(08)62333-5
Keywords
direct gas to liquid; methane dehydroaromatization; Mo/H-MFI; L-XANES; K-XAFS
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Funding
- UVSOR-IMS, Japan [18-502, 19-501]
- KEK-PF, Japan [2000G274, 2004G110]
- Grants-in-Aid for Scientific Research [21560803] Funding Source: KAKEN
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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. H-2 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-III-edge 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 H-2. It is concluded that Mo-oxycarbide species act as highly active species, and their stability affected the durable activity in the presence of H-2.
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