Effect of Rutile Content on the Catalytic Performance of Ru/TiO2 Catalyst for Low-Temperature CO2 Methanation
Effect of Rutile Content on the Catalytic Performance of Ru/TiO2 Catalyst for Low-Temperature CO2 Methanation
复制标题
金红石含量对Ru/TiO2催化剂低温CO2甲烷化催化性能的影响
DOI：
10.1021/acssuschemeng.1c05565
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发表时间：
2021-10
影响因子：
8.4
通讯作者：
Xie Zhaoxiong
中科院分区：
文献类型：
--
作者：
Zhao Zhiying;Jiang Qiaorong;Wang Qiuxiang;Wang Mingzhi;Zuo Jiachang;Chen Hanming;Kuang Qin;Xie Zhaoxiong
CO2加氢制甲烷（CH 4）不仅可以减少CO2的过量排放，而且可以生产可直接利用的清洁能源。然而，由于CO2的活化需要较高的反应温度，因此需要开发一种在较低反应温度下具有高活性和高CH 4选择性的CO2甲烷化催化剂。本研究采用焙烧法制备了不同金红石含量的二氧化钛（TiO 2）载体，考察了Ru/TiO 2催化剂中TiO 2载体金红石含量与低温CO2甲烷化反应性能的关系。表征结果表明，Ru物种优先在载体TiO 2的金红石相上生长，且Ru物种与TiO 2之间的相互作用随金红石相含量的增加而增强。此外，载体上的氧空位浓度，这将提供更多的CO2吸附位，随着金红石含量的减少而增加。金红石含量在15%和30%之间时，反应性最好。研究了金红石含量对低温CO2甲烷化反应性能的影响，为制备高活性Ru/TiO 2催化剂提供了指导。
Hydrogenation of carbon dioxide (CO2) to methane (CH4) bears the potential not only to alleviate excessive emission of CO2but 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 CH4selectivity at low reaction temperature for CO2methanation. In this study, we synthesized titanium dioxide (TiO2) supports with different rutile contents by calcination and investigated the relationship between the rutile content of TiO2supports in Ru/TiO2catalysts and their performance for low-temperature CO2methanation. The characterization results indicated that Ru species grew preferentially on the rutile phase of the support TiO2, and the interaction between Ru species and TiO2became 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 CO2methanation and provided guidance for the preparation of Ru/TiO2catalyst with high activity.
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