关键词: 一氧化碳, 甲烷化, 氧化铝, 催化剂, 积炭

Abstract: Ni/ZrO2-Al2O3 catalysts were prepared by multi-step wet impregnation method and characterized by N2 physisorption，X-ray diffraction (XRD)，temperature-programmed reduction (TPR)，temperature-programmed desorption (TPD) and temperature-programmed oxidation (TPO) techniques. The influence of zirconia loading on the reactivity of alumina supported nickel catalysts for CO methanation with low H2/CO ratio has been investigated. The results revealed that the addition of an intermediate content of ZrO2 improved the reducibility and dispersion of Ni species by weakening the interaction between nickel and support，which is responsible for the enhanced catalytic performances. Furthermore，it was shown that the addition of ZrO2 in Ni/Al2O3 catalysts effectively inhibited the formation of low active C species，resulting in a better coking resistance and higher catalytic stability.

Key words: carbon monoxide, methanation, alumina, catalyst, carbon deposition