AQUEOUS-PHASE REFORMING OF METHANOL FOR HYDROGEN PRODUCTION OVER SUPPORTED METAL CATALYST

Abstract

Abstract: Aqueous-phase reforming (APR) of the water solution with methanol mass fraction of 5 % over catalysts with Pt, Ru, Ni as active metals was studied. Pt-based catalysts exhibited good reaction performance at suitable temperature and LHSV. The conversion rate of methanol reached 99%, the selectivity of hydrogen was over 98%, and CO volume fraction in the product was below 0.01%. The conversion rate of methanol over Ni/Al2O3 was > 98%, however, the hydrogen selectivity decreased with the increase of the conversion rate but it was still above 80%. The methanol conversion rate on Ru/Al2O3 was over 98%, but the hydrogen selectivity decreased rapidly from 68% to 20% with the increase of methanol conversion rate. The reaction mechanism was obviously different from that of Pt and Ni. According to the reaction conditions and the product composition, the reaction path of methanol APR was further discussed. When the ratio of H2 to methane (CH4) in the product was higher than 2/3, the main reaction path was mainly hydrogen production. When the ratio was lower than 2/3, the reaction path was dominated by methanation.

Key words: methanol, Liquid-phase, catalytic reforming, hydrogen production

CLC Number:

References

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