Abstract
The preparation of carburized CoMo with alumina, potassium or zirconium added and their activity for the water–gas shift reaction at 453 K were investigated on the basis of XRD, temperature-programmed desorption (TPD) after H 2 18O adsorption, transmission electron microscopy, and X-ray photoelectron spectroscopy. The carburized 5 wt% Al 2O 3/Co 46.5Mo 46.5K 2Zr 5 catalyst exhibited the highest CO conversion and TOF. The TPD experiment after H 2 18O adsorption showed that the Zr-containing catalysts produced Co 6Mo 6C 1 from β-Mo 2C and Co metal, but the catalyst without zirconium produced MoO 2 and Co 3Mo. The presence of potassium significantly promotes water dissociation while zirconia prevented the oxidation of β-Mo 2C. The Al 2O 3KZr-promoted CoMo catalyst exhibited a higher distribution of Co 0 and Co 2+ than the catalysts containing either zirconium or potassium in the presence of the Co 3+ ions. The Al 2O 3KZr-promoted CoMo catalyst contained β-Mo 2C, small Co metal particles and Co 6Mo 6C 1 along with zirconia, potassium and alumina.
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