Effect of Rutile Content on the Catalytic Performance of Ru/TiO₂ Catalyst for Low-Temperature CO₂ Methanation
2021
Zhao, Zhiying | Jiang, Qiaorong | Wang, Qiuxiang | Wang, Mingzhi | Zuo, Jiachang | Chen, Hanming | Kuang, Qin | Xie, Zhaoxiong
Hydrogenation of carbon dioxide (CO₂) to methane (CH₄) bears the potential not only to alleviate excessive emission of CO₂ but to produce clean energy for direct use. However, due to the high temperature required for the activation of CO₂, it is necessary to develop a catalyst with high activity and high CH₄ selectivity at low reaction temperature for CO₂ methanation. In this study, we synthesized titanium dioxide (TiO₂) supports with different rutile contents by calcination and investigated the relationship between the rutile content of TiO₂ supports in Ru/TiO₂ catalysts and their performance for low-temperature CO₂ methanation. The characterization results indicated that Ru species grew preferentially on the rutile phase of the support TiO₂, and the interaction between Ru species and TiO₂ became stronger with increasing rutile content. In addition, the concentration of oxygen vacancies on the support, which would provide more adsorption sites for CO₂, increased with the decreasing rutile content. The best reactivity was achieved with a rutile content between 15% and 30%. This work included a thorough investigation on the effect of rutile content on the performance of low-temperature CO₂ methanation and provided guidance for the preparation of Ru/TiO₂ catalyst with high activity.
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