柠檬酸(CA)对Cu-Mn-O/γ-A1_2O_3催化燃烧苯性能的影响  

Effect of CA on the Combustion Performance of Benzene Activity of γ-A1_2O_3 Supported Cu-Mn

作　　者：李楠[1] 裴甜婕 柳来栓[1] 徐龙坤[1] 李裕[1] 

机构地区：[1]中北大学化工与环境学院,山西太原030051

出　　处：《广东化工》2015年第5期5-6,共2页Guangdong Chemical Industry

基　　金：山西省科技重大专项(20111101013);山西省自然科学基金项目(2009011011-4)

摘　　要：以大孔拟薄水铝石为原料,添加有机助剂制备了比表面积高、孔分布宽的柱状氧化铝载体。用等体积浸渍法制备了Cu-Mn-O-CA/γ-A12O3催化剂(CuO,MnOx质量分数分别为14%,7%,n(CA)∶n(CuO)=1∶1),考察了其催化燃烧苯的活性,并利用低温氮吸附、X射线衍射(XRD)对催化剂结构进行了表征。结果表明:制备的γ-A12O3载体比表面积325m2/g,孔容0.48cm3/g,主要是中孔占总孔容的90.2%;添加柠檬酸(CA)后,活性组分均匀分散在载体表面,XRD谱图无明显CuO和MnOx特征峰;在空速1800h-1,苯进料浓度2mg/m3,反应温度350℃下苯催化燃烧转化率达到95%以上。The γ-Al2O3 monolith support with high surface area and wide pore size distribution was prepared by extruding of a mixture of pseudo boehmite,organic additives.Cu-Mn-O-CA/γ-A12O3 catalyst（the mass fraction of CuO is 14 % and Mn Ox is 7 %,n（CA）∶n（CuO）=1∶1）prepared by equal volume impregnation method were tested for the catalytic combustion of benzene.The N2 adsorption-desorption,the X-ray diffraction（XRD） phase analysis revealed that the prepared γ-A12O3 surface area,pore volume and the percentage of Mesopore（2~50 nm） are 325 m2/g,0.48 cm3/g and 90.2 % and the addition of CA resulted in a high dispersion of Cu-Mn species on alumina.95 % combustion of benzene was achieved at 350 ℃,feed concentration of benzene 2mg/m3 and the space velocity of 1800 h-1 over the CA-promoted catalyst.

关 键 词：Γ-AL2O3 柠檬酸 CUO MNOX 催化燃烧 

分 类 号：TQ[化学工程]