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A group of Ni/SiO 2 catalysts was prepared via the complexed-impregnation method with different amounts of citric acid (Ni−C/SiO 2 ). The Ni−C/SiO 2 and Ni/SiO 2 prepared by the conventional impregnation method were respectively tested for carbon dioxide reforming of methane (CDR) at CO 2 /CH 4 = 1.0, a gas hourly space velocity of 60 000 mL•g −1 •h −1 , and a reaction temperature of 750 °C. The characterization results indicated that Ni−C/SiO 2 showed higher Ni dispersion and stronger Ni−support interaction than Ni/SiO 2 . As a result, superior anti-coke and anti-sintering of Ni were obtained over the Ni−C/SiO 2 during the period of CDR operation. Importantly, a highly active and stable catalyst was obtained by optimizing the amount of citric acid added, and an unobservable deactivation was exhibited over Ni−C/SiO 2 with a molar ratio of citric acid to Ni of 2.0 for the CDR testing within the time on stream of 100 h.

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