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/Al2O3 catalyst aging under microwave irradiation

    摘要
  • 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。

     

    Abstract: 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.

     

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