沉淀剂对Cu-Zn-Al-Mg甲醇合成催化剂性能的影响  

Effect of precipitant on catalytic properties of Cu-Zn-Al-Mg methanol synthesis catalyst

作　　者：张可羡 蔡洪城 张勇 惠武卫 周菊发 孙晨 郑天平 贺安平 黄晨 赵安民 Zhang Kexian;Cai Hongcheng;Zhang Yong;Hui Wuwei;Zhou Jufa;Sun Chen;Zheng Tianping;He Anping;Huang Chen;Zhao Anmin(National Engineering Research Center for C1 Chemistry,State Key Laboratory of Industrial Vent Gas Reuse,Southwest Institude of Chemical Co.,Ltd.,Chengdu 610225,Sichuan,China)

机构地区：[1]国家碳一化学工程技术研究中心,工业排放气综合利用国家重点实验室,西南化工研究设计院有限公司,四川成都610225

出　　处：《工业催化》2021年第3期55-60,共6页Industrial Catalysis

基　　金：四川省重点研发项目(大型化甲醇合成催化剂国产化2019YFG0531)。

摘　　要：采用二步共沉淀法,选取不同沉淀剂Na_(2)CO_(3)、K_(2)CO_(3)和NaHCO_(3)制备Cu-Zn-Al-Mg合成甲醇催化剂,考察不同沉淀剂对催化剂性能的影响。采用N2低温吸附、XRD、H_(2)-TPR和TG-DTG等对样品进行分析,结果表明,K_(2)CO_(3)为沉淀剂时,催化剂前驱体中锌铝水滑石物相多且结晶好,Na_(2)CO_(3)为沉淀剂时,催化剂前驱体中有更多的Zn^(2+)发生取代生成(Cu,Zn)_(2)(OH)_(2)CO_(3)物相,有利于CuO分散,NaHCO_(3)为沉淀剂时,催化剂比表面积小,平均孔径及CuO晶粒尺寸大。A two-step co-precipitation method was used to prepare Cu-Zn-Al-Mg methanol synthesis catalysts with different precipitants,such as Na_(2)CO_(3),K_(2)CO_(3)and NaHCO_(3).The effects of precipitant on catalyst performance were investigated.The properties of catalysts were characterized by N_(2)adsorption-desorption,XRD,H_(2)-TPR,and TG-DTG.The results showed that K_(2)CO_(3)as precipitant was conductive to form well-crystallized Zn-Al hydrotalcite in catalyst precursor and Na_(2)CO_(3)as precipitant was beneficial to Zn^(2+)substitution in the precursor to form(Cu,Zn)_(2)(OH)_(2)CO_(3)phase and copper dispersion,while catalyst prepared with NaHCO3 had smaller specific surface area and larger average pore size and CuO grain.

关 键 词：催化剂工程 共沉淀 沉淀剂 合成甲醇催化剂 催化活性 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]