负载在介孔AlO-CeO上的镍纳米催化剂用于低温CO甲烷化反应。
Ni nanocatalysts supported on mesoporous AlO-CeO for CO methanation at low temperature.
作者信息
Wu Yushan, Lin Jianghui, Ma Guangyuan, Xu Yanfei, Zhang Jianli, Samart Chanatip, Ding Mingyue
机构信息
School of Power and Mechanical Engineering, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Hubei Province Key Laboratory of Accoutrement Technique in Fluid Machinery & Power Engineering, Wuhan University Wuhan 430072 China
State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University Yinchuan 750021 China.
出版信息
RSC Adv. 2020 Jan 10;10(4):2067-2072. doi: 10.1039/c9ra08967e. eCollection 2020 Jan 8.
The selectivity and activity of a nickel catalyst for the hydrogenation of carbon dioxide to form methane at low temperatures could be enhanced by mesoporous AlO-CeO synthesized through a one-pot sol-gel method. The performances of the as-prepared Ni/AlO-CeO catalysts exceeded those of their single AlO counterpart giving a conversion of 78% carbon dioxide with 100% selectivity for methane during 100 h testing, without any deactivation, at the low temperature of 320 °C. The influence of CeO doping on the structure of the catalysts, the interactions between the mesoporous support and nickel species, and the reduction behaviors of Ni ions were investigated in detail. In this work, the addition of CeO to the composites increased the oxygen vacancies and active metallic nickel sites, and also decreased the size of the nickel particles, thus improving the low temperature catalytic activity and selectivity significantly.
通过一锅法溶胶 - 凝胶法合成的介孔AlO - CeO可提高镍催化剂在低温下将二氧化碳加氢生成甲烷的选择性和活性。所制备的Ni/AlO - CeO催化剂的性能超过了单一AlO催化剂，在320℃的低温下进行100小时测试时，二氧化碳转化率为78%，对甲烷的选择性为100%，且没有任何失活现象。详细研究了CeO掺杂对催化剂结构、介孔载体与镍物种之间的相互作用以及Ni离子还原行为的影响。在这项工作中，向复合材料中添加CeO增加了氧空位和活性金属镍位点，同时减小了镍颗粒的尺寸，从而显著提高了低温催化活性和选择性。
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