复合氧化物载体对镍基催化剂上CO甲烷化反应性能的影响(英文)  

Effects of composite oxide supports on catalytic performance of Ni-based catalysts for CO methanation

作　　者：张罕[1] 董云芸 方维平[2] 连奕新[2] 

机构地区：[1]厦门大学化学化工学院化学工程与生物工程系,福建厦门361005 [2]厦门大学化学化工学院化学系 醇醚酯化工清洁生产国家工程实验室,福建厦门361005

出　　处：《催化学报》2013年第2期330-335,共6页

基　　金：supported by the National Basic Research Program of China(973 Program,2010CB226903)~~

摘　　要：采用改良的粉末混合法制备了系列经过其它金属氧化物改性的NiO/Al2O3催化剂,并运用X射线衍射、透射电子显微镜、N2低温物理吸附-脱附、程序升温还原、程序升温脱附、拉曼以及X射线光电子能谱对催化剂进行了表征.结果显示,在300~700oC经MgO修饰的NiO/Al2O3催化剂上CO甲烷化反应活性比NiO/ZrO2-Al2O3和NiO/SiO2-Al2O3的高.另一金属氧化物的加入削弱了NiO/Al2O3催化剂中Ni-Al间相互作用,形成更多的活性Ni物种,从而促进了反应的进行.Metal-oxide-modified NiO/Al2O3 catalysts for methanation of CO were prepared using a modified grinding-mixing method and characterized using X-ray diffraction, transmission electron microscopy, N2 adsorption-desorption isotherms, temperature-programmed reduction by H2, temperature-programmed desorption by H2, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results show that the activity of an MgO-modified NiO/Al2O3 catalyst is better than those of NiO/ZrO2-Al2O3 and NiO/SiO2-Al2O3 in the reaction temperature range 300–700 °C. The incorporation of a metal oxide into NiO/Al2O3 was found to weaken Ni–Al interactions, leading to generation of large numbers of active Ni species, and this was confirmed to be responsible for the improvement in the performances of the catalysts in the methanation reaction.

关 键 词：一氧化碳 甲烷化 镍基催化剂 合成气 复合氧化物载体 

分 类 号：O643.32[理学—物理化学]