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OALib Journal期刊
ISSN: 2333-9721
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沉淀方式对微波辐射老化制备cuo/zno/al2o3催化剂性能的影响
, PP. 743-749
Keywords: 微波辐射,cuo/zno/al2o3催化剂,合成甲醇,沉淀方式
Abstract:
？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。
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