高岭土负载Dawson结构磷钨酸钕催化剂的制备、表征及催化合成乙酸正丁酯  

Preparation and Characterization of NdH_3P_2W_(18)O_(62)/kaolin and Its Catalytic Properties for Synthesis of n-Butyl Acetate

作　　者：曹小华[1,2] 陶春元[1,2] 邱新龙 徐常龙[2] 占昌朝[1,2] 

机构地区：[1]江西省生态化工工程技术研究中心,江西九江332005 [2]九江学院化学与环境工程学院,江西九江332005

出　　处：《稀土》2016年第3期7-12,共6页Chinese Rare Earths

基　　金：国家自然科学基金项目(21161009);江西省自然科学基金项目(20132BAB203004;20122BAB213001);江西省教育厅科技项目(GJJ13723);九江学院科技项目(2013KJ005)

摘　　要：以高岭土为载体、NdH_3P_2W_(18)O_(62)为活性组分,通过浸渍法制备出40%NdH_3P_2W_(18)O_(62)/高岭土催化剂,考察其在催化乙酸与正丁醇酯化反应中的催化活性,利用FT-IR、XRD、SEM、EDX、N2-TPD及NH3-TPD对催化剂结构进行表征。结果表明,NdH_3P_2W_(18)O_(62)较好地负载在高岭土上,且保持Dawson结构不变。当正丁醇与乙酸的摩尔比为1.5∶1.0,w(40%NdH_3P_2W_(18)O_(62)/高岭土)=2.6%(以反应物质量计),反应温度125℃,反应时间2.5 h,酯化率为94.4%。该催化剂具有良好的重复使用性能,第5次重复使用时酯化率仍可保持为81.9%。Phosphotungstic acid neodymium supported on kaolin （40% NdH3PzW18O62/ Kaolin） were prepared by im- pregnating method, the catalytic performance was evaluated by the esterification reaction of n - butanol with acetic acid. And its structural characteristics were characterized by FT- IR, XRD, SEM, EDX, N2 -TPD and NH3 -TPD. The results indi- cated that the NdH3P2WIsO62 was loaded well in kaolin and the NdH3P2W18O62 on kaolin support existed in the form of Daw- son structure. The catalyst exhibited high esterifieation reaction catalytic activity and the highest esterification rate was up to 94. 4% under the optimal reaction conditions, i. e. , the mass ratio of butanol to total reactant of 2.6% , reaction temperature of 125℃, reaction time of 2. 5 h. When the 40% NdH3P2W18O62/kaolin being used five times, the esterification rate could reach 81.9%.

关 键 词：钕 NdH3P2W18O62/高岭土 DAWSON结构 催化活性 乙酸正丁酯 

分 类 号：O614.335[理学—无机化学] TQ426.91[理学—化学]