晶化温度对Cs/SBA-15催化乙酸乙酯羟醛缩合反应的影响  

Effect of crystallization temperature on performances of Cs/SBA-15 in catalyzing aldol condensation of ethyl acetate

作　　者：田翔 田恒水[1] TIAN Xiang;TIAN Heng-shui(School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化工学院,上海200237

出　　处：《现代化工》2021年第4期181-184,共4页Modern Chemical Industry

摘　　要：采用水热合成法于不同晶化温度制备SBA-15载体,并用浸渍法制备铯负载型催化剂,通过XRD、N2吸附-脱附、ATR-FTIR和NH3/CO2-TPD等手段对载体和催化剂的结构和性能进行表征。结果表明,晶化温度为373 K时,载体具有较致密的孔壁结构和合适的比表面积,使催化剂含有较多的碱位数量及合适的孔径,进而展示出较优的催化性能。当反应温度为663 K、空速为20 mL/[h·g(cat)]、n(乙酸乙酯)∶n(甲醛)=2.5∶1时,丙烯酸乙酯和丙烯酸的总收率为67%,总空时收率为69.2 h^(-1)。SBA-15 supports are prepared by hydrothermal method at different crystallization temperatures,and used to fabricate cesium-supported catalysts through impregnation method.The structure and acid-base properties of the supports and the catalysts are characterized by XRD,N2 adsorption-desorption,ATR-FTIR and NH3/CO2-TPD.As the crystallization temperature remains at 373 K,the prepared SBA-15 support has denser silica wall structure and proper specific surface area,which makes the catalysts have more basic sites and proper pore diameter,exhibiting a better catalytic performance.Total yield of main products reaches 67%and the correlating summed space-time yield reaches 69.2 h^(-1) when reaction temperature remains at 663 K,space velocity is 20 mL/(h·g^(-1)(cat)),and n(ethyl acetate)∶n(formaldehyde)=2.5∶1.

关 键 词：晶化温度 Cs/SBA-15 羟醛缩合 丙烯酸乙酯 丙烯酸 

分 类 号：TH3[机械工程—机械制造及自动化]