Co-impregnation and sequential impregnation were used to prepare a series of Ni–Ru/γ-Al 2 O 3 catalysts for CO 2 methanation. By comparing the structure, surface species and catalytic performances, we uncovered the surface species segregation of Ru in Ni–Ru catalysts, and its effect on catalytic properties.
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Zhen et al. (2014) studied this question.
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