This study deals with the hydrogenation of CO₂ into CH₄ and H₂O on an Al₂O₃-supported Ni catalyst with Ni content of 20 wt%. CO₂ adsorbates were identified by DRIFTS and CO₂-TPD mainly showing the formation of carbonate and carboxylate species. Exposure to H₂ indicates that hydrogen carbonate present on the support as well as carbonate presumably adsorbed at the Ni-Al₂O₃ interface are reactive intermediates in the methanation. Contrary, carboxylate also adsorbed on Ni as well as formate species are acting as spectators.

中文翻译：

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Ni / Al ₂ O ₃催化剂上CO ₂甲烷化的DRIFTS和TPD研究

这与CO的氢化研究涉及₂到CH ₄和H ₂ O于的Al ₂ ö ₃ -支持镍催化剂与20重量％的Ni含量。通过DRIFTS鉴定了CO ₂吸附物，并且CO ₂ -TPD主要显示了碳酸盐和羧酸盐物质的形成。暴露于H ₂表示存在于载体上的碳酸氢盐以及可能吸附在Ni-Al ₂ O ₃界面上的碳酸盐是甲烷化中的反应性中间体。相反，也吸附在镍上的羧酸盐以及甲酸盐类起着旁观者的作用。