ZnO/Al_2O_3催化对苯二甲酸脱羧反应性能及失活  

Reaction Performance and Deactivation of ZnO/Al_2O_3 During the Decarboxylation of Terepthalic Acid

作　　者：蒋斌波[1] 陆飞鹏[1] 庄岩[1] 廖祖维[1] 王靖岱[1] 阳永荣[1] 黄正梁[1] 

机构地区：[1]浙江大学化学工程与生物工程学院化学工程联合国家重点实验室,浙江杭州310027

出　　处：《石油学报（石油加工）》2015年第3期603-610,共8页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21176208);国家高技术研究发展计划项目(2012AA030304)资助

摘　　要：采用共沉淀法制备了ZnO/Al2O3催化剂,并将其应用于对苯二甲酸(TPA)脱羧反应中,采用XRD、TG-DTA、N2吸附-脱附等方法表征制备的催化剂,分别考察了焙烧温度、ZnO负载量、质量空速以及水/TPA摩尔比对TPA脱羧反应的影响,并研究了ZnO/Al2O3催化剂的反应稳定性以及失活机理。结果表明,采用焙烧温度为600℃制备的ZnO负载量(质量分数)为30%的ZnO/Al2O3催化剂,在质量空速0.5h-1、无水条件下,TPA脱羧的转化率最高,苯收率可达到86%。催化剂表面积炭和尖晶石相晶粒的增长均会导致脱羧催化剂失活。ZnO/A12O3 catalyst was prepared by chemical co-precipitation method and then applied in the decarboxylation of terephthalic acid（TPA）. The prepared ZnO/A12O3 catalyst was characterized by XRD, TG-DTA and N2 adsorption-desorption. The influences of ZnO loading amount, calcination temperature, space velocity and molar ratio of water to TPA on the decarboxylation performance of ZnO/A12O3 were investigated, respectively. The activity stability and deactivation mechanism of the as-prepared ZnO/A12O3 catalyst were also discussed. The results showed that over the ZnO/A1203 catalyst with ZnO loading amount of 30% and calcined at 600℃ under the MHSV of 0.5 h-1 and without water, the highest conversion of the TPA decarboxylation was obtained with the benzene yield of 86%. The carbonaceous deposition and growth of spinel phase would both cause the deactivation of ZnO/A12O3 deearboxylation catalyst.

关 键 词：脱羧 催化 氧化锌 失活 积炭 

分 类 号：TQ032[化学工程]