1. Influence of pretreatment temperature on catalytic performance of rutile TiO2-supported ruthenium catalyst in CO2 methanation.
- Author
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Xu, Jinghua, Su, Xiong, Duan, Hongmin, Hou, Baolin, Lin, Qingquan, Liu, Xiaoyan, Pan, Xiaoli, Pei, Guangxian, Geng, Haoran, Huang, Yanqiang, and Zhang, Tao
- Subjects
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TEMPERATURE effect , *CATALYTIC activity , *RUTILE , *TITANIUM dioxide , *RUTHENIUM catalysts , *CARBON dioxide , *METHANATION - Abstract
Catalytic hydrogenation of CO 2 to methane was investigated over Ru/rutile TiO 2 , focusing on the influence of the pretreatment temperature on the activity. Rutile TiO 2 stabilized Ru nanoparticles even after pretreatment at 800 °C; therefore it was possible to establish the structure–activity relationship without considering the particle size effect. The CO 2 turnover frequency initially increased with increasing pretreatment temperature from 300 to 800 °C, and reached a maximum value of 1.59 s −1 on Ru/rutile TiO 2 pretreated at 600 °C; it decreased to 1.16 s −1 for the sample pretreated at 800 °C. The characterization results indicated that the activity depended on both the extent of encapsulation of Ru particles by TiO x layers and the number of hydroxyl groups on the TiO x surface. The mechanism of CO 2 methanation was discussed based on in situ diffuse-reflectance infrared Fourier-transform spectroscopy results. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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