摘要
采用混合固相反应法制备了一系列不同焙烧温度的镁铝复合氧化物载体，并负载Co—Mo活性组分制备了Co—Mo／MgO—Al2O3催化剂；通过扫描电子显微镜、傅里叶变换红外光谱、N2吸附一脱附、X射线衍射、热分析和质量滴定等方法考察了焙烧温度对载体性能的影响，并评价了Co—Mo／MgO—Al2O3催化剂在水煤气变换反应中的活性。实验结果表明，500～800℃焙烧的镁铝复合氧化物载体以MgAl2O4·xMgO·yAl2O3无定形复合氧化物形式存在，900～1300℃焙烧的镁铝复合氧化物载体转变为MgAl2O4尖晶石；600～800℃焙烧的镁铝复合氧化物载体具有适宜的比表面积和孔结构，有较高的零电荷点，有利于Co—Mo活性组分的吸附和分散，以其为载体制备的Co—Mo／Al2O3-MgO催化剂具有很高的活性。
A series of Mg-Al composite oxide supports were prepared by solid-reaction. The relevant Co-Mo/MgO-Al2O3 catalysts were obtained by supporting Co-Mo on the supports. Effect of calcination temperature on physic-chemical properties of the supports was studied by means of SEM, XRD, BET, FTIR, thermal analysis and mass titration technique. Activities of Co-Mo/MgO-AI203 catalysts in water gas shift reaction were evaluated. Mg-Al composite oxides calcinated at 500 - 800℃ exist in amorphous state of MgAl2O4 · xMgO· yAl2O3 and transform further to MgAl2O4 spinel after being calcined at 900 - 1 300℃. The Mg-Al composite oxides calcined at 600 - 800℃ possess more feasible specific surface area, pore structure and high point of zero charge, which are favorable for adsorption and dispersion of Co-Mo active components. Thus the catalysts supported on the said Mg-Al composite oxides exhibited higher activities for water gas shift reaction than those supported on Mg-Al composite oxides calcined at 900 - 1300℃.
出处
《石油化工》
CAS
CSCD
北大核心
2009年第6期622-629,共8页
Petrochemical Technology
基金
厦门市企业创新基金项目(3502Z31082)
福建省科技厅工业科技重点项目(2007H0066)
关键词
镁铝复合氧化物载体
焙烧温度
水煤气变换
钴-钼基催化剂
magnesium-aluminum composite oxide support
calcination temperature
water-gas shift
cobalt-molybdenum catalyst
