メタンからベンゼンと水素をつくるMTB触媒技術と工業化にむけて(<総説特集>実用化されつつある天然ガス利用プロセスの最前線)

概要

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Novel MTB catalytic technology to produce benzene and hydrogen from methane and its industrial application was reviewed in terms of the advanced utilization of methane resources such as natural gas, COG, CBM, methane hydrates (MH) and biogas for petrochemical feed-stocks. High activity and over 85% selectivity of benzene formation has been achieved in the dehydroaromatization of methane using Mo and Re supported catalysts with the selected zeolites such as ZSM-5 and MCM-22 having the microporous apertures of 5.5 Å diameter at 750℃ and 1-3 atm. The MTB catalytic performances are kept stable for long time-on-stream by addition of a few % of CC_2 (CO) and H_2 in the methane feed due to the effective removal of coke on the catalyst surface. The pilot demonstration study of the MTB technology has been conducted by NEDO consortium project using natural gas and NLCE project at Bekkai, Hokkaido using biogas-derived methane. The advantageous economic evaluation of the industrial MTB process has been discussed using COG-derived methane and off-site natural gas to produce benzene as the plastics and commodity feed stocks over the conventional oil refinery, particularly due to the recent drastic oil cost-inflation.
2007-04-20