Effect of ZrO2 promoter on the catalytic activity for CO methanation and adsorption performance of the Ni/SiO2 catalyst

✍ Scribed by Rui-fang WU; Yin ZHANG; Yong-zhao WANG; Chun-guang GAO; Yong-xiang ZHAO

• Publisher: Elsevier
• Year: 2009
• Tongue: Chinese
• Weight: 231 KB
• Volume: 37
• Category: Article
• ISSN: 1872-5813
• DOI: 10.1016/s1872-5813(10)60009-6

✦ Synopsis

The catalytic activities for CO methanation and adsorption performances of the Ni/SiO 2 and Ni/ZrO 2 -SiO 2 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 converted at 200 C over the Ni/ZrO 2 -SiO 2 catalyst under the reaction condition of 1% of CO, GHSV of 5000 h -1 , and the atmospheric pressure. However, the CO conversion was only 35% over the Ni/SiO 2 catalyst under the same reaction condition, and CO was not completely converted until 270 C, which suggested that the catalytic activity of the Ni/ZrO 2 -SiO 2 catalyst increased with the addition of ZrO 2 promoter. Meanwhile, the addition of ZrO 2 promoter enhanced the CO adsorption capacity of the Ni/ZrO 2 -SiO 2 catalyst. In the presence of H 2 , a large number of bridged carbonyl hydrides were formed over the Ni/ZrO 2 -SiO 2 catalyst at lower temperatures, resulting in high catalytic activity for CO methanation. In CO methanation, the breaking of C-O bond over catalysts was by multihydrogen carbonyl hydride rather than by direct breaking.