Methanation of carbon dioxide is a promising approach to ameliorate greenhouse effect. Rhodium based catalysts have been intensively investigated due to its ability in cleavage of C-O bond, but the role of support in the catalysts was underestimated. In this regard, we explored the methanation of CO₂ over Rh catalysts with three metal oxide supports (TiO₂, Al₂O₃, and ZnO). It was found that Rh/TiO₂ exhibited the highest catalytic activity with product yield of 455 mmol g-1 cat h^-1 (CH₄ and CO) at 370 °C and 2 MPa, which is 2 and 14 times higher than Rh/A1₂O₃ and Rh/ZnO, respectively. Moreover, the CH₄ selectivity over Rh/TiO₂ was higher than 95%. The superior catalytic performance of Rh/TiO₂ can be mainly attributed to its unique electronic structure associated with stronger Rh-TiO₂ interaction and the existence of Ti³⁺ ions on TiO₂.

二氧化碳的甲烷化是改善温室效应的一种有前途的方法。铑基催化剂因其裂解CO键的能力而被广泛研究，但低估了载体在催化剂中的作用。在这方面，我们探索了在具有三种金属氧化物载体（TiO ₂，Al ₂ O ₃和ZnO）的Rh催化剂上CO ₂的甲烷化反应。结果表明，在370℃和2 MPa条件下，Rh / TiO ₂表现出最高的催化活性，产物收率为455 mmol g-1 cat h ^-1（CH ₄和CO），分别是Rh / TiO 2和14倍。分别为Al ₂ O ₃和Rh / ZnO。而且，CH_相对于Rh / TiO _2的4选择性高于95％。的Rh / TiO 2的优良的催化性能₂可主要归因于与更强的Rh-TIO关联其独特的电子结构₂相互作用和Ti的存在³⁺离子在TiO ₂。