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.
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)
出处
《工业催化》
CAS
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)。
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
catalyst engineering
co-precipitation
precipitan
methanol synthesis catalyst
catalytic activity
