Performance of 3%Mo/ZSM-5 catalyst in the presence of water during methane aromatization in supersonic jet expansion

Abstract

The influence of water in the CH 4 feed on the performance of 3%Mo/ZSM-5 catalyst during methane direct aromatization under supersonic jet expansion (SJE) condition was investigated. We observed that both surface Mo 2 O x C y and b-Mo 2 C species are catalytically active for methane aromatization under SJE condition. The presence of water can promote the removal of surface carbon before the generation of aromatictype and/or graphitic carbon. In appropriate amount, water can improve the stability of surface Mo 2 O x C y , and hence resulting in better catalytic performance. The study provided valuable information relevant to the direct utilization of methane hydrate.

Improved benzene production from methane dehydroaromatization over Mo/HZSM-5 catalysts via hydrogen-permselective palladium membrane reactors

“…5B), suggesting that MoO x species particularly those associated with the Brønsted acid sites are not completely reduced and carburized to Mo 2 C. 45,58 It is very likely that MoO x C y originates from the reduction of IJMo 2 O 5 ) 2+ dimers by CH 4 . 59,60 Because the Mo 3d 5/2 binding energy for MoO x C y and Mo 2 C (i.e. 227.6-228.6 eV) 40,57,61 is very close to that for Mo 4+ , it may be difficult to Catalysis Science & Technology Paper distinguish these species.…”

Recent progress in methane dehydroaromatization: From laboratory curiosities to promising technology

“…(1) Regarding that the zeolites HZSM-5 and HMCM-22 containing molybdenum exhibit higher CH 4 conversion and selectivity to benzene than other types of zeolites, improvements may be made by modifying both the zeolite and the active phase. (2) Regarding the reaction mechanism, Mo-zeolite acts as a bifunctional catalyst.…”

“…The world appears to have abundant reserves of methane, especially with the recent discoveries of significant deposits of shale gas in continental North America and methane hydrate in the sediments of the ocean floors, which are conservatively estimated to represent twice the amount of carbon in all other known fossil fuel reserves [1]. Methane, the most abundant compound in natural gas, can be converted catalytically to liquid fuels or useful chemicals.…”

High-temperature desulfurization of hot coal gas on Mo modified Mn/KIT-1 sorbents

“…6C illustrated that the peaks at 235.6 eV and 232.4 eV attributed to Mo 3d 5/2 and Mo 3d 3/2 XPS spectra for Mo 6+ , respectively [48]. After desulfurization, the maximum in peak at 232.4 eV shifted to 228.4 eV, indicating that MoO 3 is partially conversed into Mo 2 C. According to the report of Liu et al, CO disproportionation reaction (2CO = C + CO 2 ) occurs at 700°C [49].…”