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

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,H2-TPR.The reaction results indicated that the order of catalytic activity was Stepwise II Parallel-flow Stepwise I Reversed Forward.When Al(NO3)3 solution and Na2CO3 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)5(CO3)2(OH)6,which possessed well-dispersed CuO,strong synergy in CuO-ZnO and low H2-reduction temperature after calcination.