CO对CuO/ZnO/AlO催化剂前体老化及催化性能的影响

被引：3

作者：

陈雄

郑华艳

杨浩

李忠

机构：

[1] 太原理工大学煤科学与技术教育部和山西省重点实验室

来源：

化工进展 | 2013年 / 11期

关键词：

CO2辅助老化; 浆态床; CuO/ZnO/Al2O3催化剂; 甲醇合成;

D O I：

暂无

中图分类号：

TQ426 [催化剂（触媒）];

学科分类号：

080502 ; 081705 ;

摘要：

采用并流共沉淀法制备CuO/ZnO/Al2O3甲醇合成催化剂前体,在通入CO2条件下老化,采用XRD、FT-IR、DTG、H2-TPR、XPS等表征手段对制备的前体及焙烧后的催化剂进行表征,研究不同CO2通入量对前体晶相转变、微观结构及其焙烧后催化性能的影响。研究结果表明,老化阶段通入CO2后,沉淀母液的pH值趋于7,产生CO32离子,进而影响Zn2+的沉淀,促进Cu2+进入Zn5(CO3)2(OH)6晶格中取代Zn2+形成绿铜锌矿(Zn,Cu)5(CO3)2(OH)6物相,有助于增强焙烧后催化剂的Cu-Zn之间协同作用,增加活性组分Cu分散度。CO2通入量为40 mL/min时,制备的催化剂在浆态床合成甲醇过程中表现出良好的催化活性和稳定性,甲醇时空收率(STY)达到301.78 g/(kg h),失活率仅为0.15%/d,与未通入CO2辅助老化制备的催化剂相比,时空收率提高了9.72%,平均失活率降低了33.33%。

引用

页码：2644 / 2649+2660 +2660

页数：7

共 29 条

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