HYDROGEN PRODUCTION FROM METHANOL STEAM REFORMING OVER CuZnAl CATALYSTS

Abstract

Abstract: A series of CuZn and CuZnAl catalysts were prepared by co-precipitation method. The catalytic performance of these catalysts for methanol steam reforming was investigated. The catalysts were characterized by BET, XRD, H2-TPR and N2O chemisorptions to explore the effect of the introduction of Al into CuZn catalyst. The results show that with the moderate ratio of Cu/Zn, the addition of Al can enlarge the specific surface area of CuZn catalyst and promote the dispersion and stability of Cu species on the catalyst surface and that the Cu50Zn40Al10 catalyst exhibits the highest catalytic activity for methanol steam reforming in the tested CuZnAl catalysts. The methanol conversion reaches 100% and the hydrogen yield is up to 97.7% under the reaction conditions: T=250 oC and P=1.0 MPa, H2O/CH3OH=1.5 molar ratio, VHSV=0.56 h-1. The Cu50Zn40Al10 catalyst has the excellent catalytic stability for methanol steam reforming during 200 h on stream and the methanol conversion has been kept at around 97%, much better than that of Cu50Zn40.

References

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