WU Rui-Fang, Zhang-Yin, Wang-Yong-Zhao, Gao-Chun-Guang, Diao-Yong-Xiang. Effect of ZrO2 promoter on the catalytic activity for CO methanation and its adsorption performance of the Ni/SiO2 catalyst[J]. Journal of Fuel Chemistry and Technology, 2009, 37(05): 578-582.
Citation:
WU Rui-Fang, Zhang-Yin, Wang-Yong-Zhao, Gao-Chun-Guang, Diao-Yong-Xiang. Effect of ZrO2 promoter on the catalytic activity for CO methanation and its adsorption performance of the Ni/SiO2 catalyst[J]. Journal of Fuel Chemistry and Technology, 2009, 37(05): 578-582.
WU Rui-Fang, Zhang-Yin, Wang-Yong-Zhao, Gao-Chun-Guang, Diao-Yong-Xiang. Effect of ZrO2 promoter on the catalytic activity for CO methanation and its adsorption performance of the Ni/SiO2 catalyst[J]. Journal of Fuel Chemistry and Technology, 2009, 37(05): 578-582.
Citation:
WU Rui-Fang, Zhang-Yin, Wang-Yong-Zhao, Gao-Chun-Guang, Diao-Yong-Xiang. Effect of ZrO2 promoter on the catalytic activity for CO methanation and its adsorption performance of the Ni/SiO2 catalyst[J]. Journal of Fuel Chemistry and Technology, 2009, 37(05): 578-582.
School of Chemistry and Chemical Engineering, Engineering Research Center of Ministry of Education for Fine Chemicals, Shanxi University, Taiyuan 030006, China
The catalytic activities for CO methanation and adsorption performances of the Ni/SiO2 and Ni/ZrO2-SiO2 catalysts were investigated by a continuous flowing microreactor apparatus and in-situ diffuse reflectance fourier transform infrared spectroscopy. The results showed that CO was completely transformed at 200℃ under the reaction conditions: CO 1%、GHSV 5000h-1 and an atmosphere pressure over the Ni/ZrO2-SiO2 catalyst, while under the same reaction conditions the CO conversion was only 35% and CO was not completely transformed until 270℃ over the Ni/SiO2 catalyst, which suggested the catalytic activity of the Ni/ZrO2SiO2 catalyst increased with the addition of ZrO2 promoter. Meanwhile, the addition of ZrO2 promoter enhanced the adsorption capacity of the Ni/ZrO2-SiO2 catalyst for CO, and that in the presence of H2 a larger amount of bridged carbonyl hydride formed over the Ni/ZrO2-SiO2 catalyst at lower temperature, resulting in the increase of its catalytic activity. In CO methanation reaction, the breaking of C—O bond over those catalysts was via multi-hydrogen carbonyl hydride rather than via direct breaking.