沉淀方式对微波辐射老化制备CuO／ZnO／Al2O3催化剂性能的影响  

Effects of precipitation manner on catalytic performance of CuO/ZnO/Al_2O_3 catalyst aging under microwave irradiation

作　　者：郑华艳[1] 李博昱[2] 刘岩[1] 陈雄[1] 李忠[1] 

机构地区：[1]太原理工大学煤化工研究所煤科学与技术教育部和山西省重点实验室,山西太原030024 [2]北京化工大学化学化工学院,北京100029

出　　处：《燃料化学学报》2012年第6期743-749,共7页Journal of Fuel Chemistry and Technology

基　　金：国家重点基础研究发展规划(973计划,2012CB723105);国家自然科学基金青年项目(21106092)

摘　　要：采用微波辐射老化沉淀母液的方法,着重考察了沉淀方式对制备的CuO/ZnO/Al2O3催化剂及其前驱体的结构和催化性能的影响。实验结果表明,沉淀方式对催化剂的活性和稳定性影响较大,其活性顺序为分步沉淀法二>并流共沉淀法>分步沉淀法一>反加法>正加法。通过XRD、DTG、H2-TPR等表征分析表明,先并流沉淀Al(NO3)3溶液和Na2CO3溶液,再并流沉淀Cu(NO3)2-Zn(NO3)2混合溶液与剩下的Na2CO3溶液,然后微波辐射老化所制备前驱体中含有更多的绿铜锌矿(Cu,Zn)5(CO3)2(OH)6物相,焙烧后形成的CuO-ZnO协同作用强,且CuO分散性好,H2还原温度较低,催化活性和稳定性也较高。CuO/ZnO/Al2O3 precursors were prepared by different precipitation manner; microwave irradiation was introduced in aging process. The effects of precipitation manner on composition of precursor, micro structure and performance of catalyst were characterized by means of XRD, DTG, HE-TPR. The reaction results indicated that the order of catalytic activity was Stepwise II 〉 Parallel-flow 〉 Stepwise I 〉 Reversed 〉 Forward. When AI（ NO3 ） 3 solution and NaECO3 solution were precipitated first and then Cu （ NO3 ） 2-Zn （ NO3 ） 2 solution were precipitated with remaining Na2CO3, the prepared precursor contained more （Cu, Zn）^（ CO3 ）2（ OH）6, which possessed well-dispersed CuO, strong synergy in CuO-ZnO and low H2-reduction temperature after calcination.

关 键 词：微波辐射 CuO/ZnO/Al2O3 催化剂 合成甲醇 沉淀方式 

分 类 号：O614.121[理学—无机化学] O614.24[理学—化学]