大孔α-Al_2O_3载体制备及其在制备CO偶联反应催化剂中的应用  

Preparation of macroporous α-Al_2O_3 support and its application in preparing catalyst for CO coupling reaction

作　　者：唐先智[1] 李虎[1] 罗曼[1] 肖文德[1] 

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《天然气化工—C1化学与化工》2016年第3期58-61,共4页Natural Gas Chemical Industry

摘　　要：以γ-Al_2O_3为原料,经酸洗和矿化剂NH4F处理等步骤,在马弗炉里高温焙烧制备得到大孔径α-Al_2O_3,并通过热重分析、X射线衍射、扫描电镜和压汞仪等设备对其性能进行表征。结果表明,在1050℃下焙烧得到的α-Al_2O_3晶相纯度高,结晶度好,孔径分布均匀,平均孔径约为2066nm。进一步将得到的α-Al_2O_3作为活性组分Pd的载体,制得Pd/α-Al_2O_3催化剂,应用于CO偶联亚硝酸甲酯制备草酸二甲酯的反应中,反应转化率高达89.0%,选择性为97.6%。Macroporous α-Al2O3 supports were prepared by using the γ-Al2O3 as raw material, washing it with dilute nitric acid, impregnating the washed γ-Al2O3 with NH4F and then calcining it in the muffle furnace. The samples were characterized by DTG, XRD, SEM and mercury intrusion method. Results show that the sample calcinated under 1050℃ had high purity of α-Al2O3 crystal, high crystallinity, uniform pore size distribution with a average pore size of 2066nm. Furthermore, the α-Al2O3 supported Pd catalyst was prepared and used for CO coupling to produce dimethyl oxalate, over which the conversion of CO could reach 89.0% with a se-lectivity to dimethyl oxalate of 97.6%.

关 键 词：大孔α-氧化铝 载体 钯 CO偶联反应 草酸二甲酯 

分 类 号：O643.3[理学—物理化学] TQ426[理学—化学]