摘要
以硝酸为溶剂,氢氧化钠为沉淀剂,采用共沉淀法,制备了一系列不同M O含量的Cu-M O O3-ZrO2催化剂,并采用X射线粉末衍射(XRD)、N2吸脱附(BET)以及程序升温还原(TPR)对催化剂结构进行了表征.研究该催化剂在二乙醇胺脱氢合成亚氨基二乙酸反应中的催化性能,考察Cu-M O O3-ZrO2的反应条件对二乙醇胺脱氢反应性能的影响.结果表明,共沉淀制备的Cu-M O O3-ZrO2催化剂(摩尔比为Cu∶M O∶Zr=3∶5∶2),具有优良的催化性能:在温度165℃、压力0.5 MPa,反应4 h条件下,二乙醇胺转化率达到100%,亚氨基二乙酸的选择性为96.3%,催化剂重复使用12次活性无明显下降.表征结果表明,添加适量的M O助剂有利于促进催化剂中CuO的还原,增大催化剂的比表面积和孔容,降低催化剂的还原温度,并显著提高催化剂的催化活性.
Cu-MoO3-ZrO2 Catalysts with different content of Mo promoter were directly prepared by coprecipitation method, using nitric acid as solvent, and sodium hydroxide as precipitator. Characterization method including X- ray diffraction, N2-physisorption and H2-temperature-programmed reduction were carried out elucidate the structure character of the catalyst with the catalytic performance. Catalysts for iminodiacetie acid synthesis from dehydrogena- tion of diethanolamine were studied. The dehydrogenation reaction conditions, including reaction temperature, re- action pressure, and reaction time, were studied in detail to obtain the optimal Cu-MoO3-ZrO2 catalytic perform- ance. The results show that Cu-MoO3-ZrO2 catalysts （the mole ratio was Cu ： Mo ： Zr=3 ： 5 ： 2） were exhibited excellent catalytic activity. The optimal reaction conditions were as follows： reaction temperature 165 ℃, reaction time 4 h, and reaction pressure 0.5 MPa. Under these conditions, the conversion of diethanolamine reached 100%, and the selectivity of iminodiacetie acid reached 96.3%, and the catalyst could be repeated for twelve times with no obvious activity decline. The characterization results indicated moderate Mo content promoted the reduction of CuO, and increased the surface area and pore volume of the catalysts, and significantly decreased the reduction temperature of the catalysts, and improved the catalytic performance of catalysts.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2013年第6期515-521,共7页
Journal of Molecular Catalysis(China)
基金
湖南省科技厅项目(2011GK3199)
作者简介
伍君（1988-），男，硕士生．wujun880416@126．com
通讯联系人，E-mail：dzk0607@163．com．
