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以硝酸铜和硝酸铈为原料,采用共沉淀法制备系列Cu/CeO_2催化剂。并用物理吸附(BET)、X射线衍射(XRD)、H2程序升温还原(H2-TPR)对催化剂的结构和还原性进行了表征,考察了其在二乙醇胺脱氢制亚氨基二乙酸反应中的催化性能。结果表明,经500℃焙烧、铜铈物质的量比为3∶1的Cu_3Ce_1催化剂还原温度最低,为230℃,且Cu_3Ce_1还原后表面有适量Cu活性中心,Cu_3Ce_1催化剂在二乙醇胺(DEA)脱氢制亚氨基二乙酸的反应中具有较好催化活性。该催化剂最适宜的反应条件为:m(DEA)∶m(Na OH)∶m(H2O)=1.15∶1.00∶2.42,催化剂用量6 g,反应温度180℃,反应压力1.1 MPa,反应时间4 h,搅拌转速600 r/min,Cu_3Ce_1催化剂上二乙醇胺的转化率为99.63%,亚氨基二乙酸选择性为95.73%,Cu_3Ce_1催化剂重复使用9次,无明显失活。
A series of Cu / CeO_2 catalysts were prepared by coprecipitation method using copper nitrate and cerium nitrate as raw materials. The structure and reducibility of the catalyst were characterized by means of physical adsorption (BET), X-ray diffraction (XRD) and temperature programmed reduction with H2 (H2-TPR). The effects of the catalyst on the dehydration of diethanolamine to iminodiacetic acid Catalytic properties. The results show that the Cu 3 Ce 1 catalyst has the lowest Cu reduction temperature of 230 ℃ and the Cu 3 Cu reduction catalyst surface after Cu 3 Ce 1 reduction at 500 ℃, and the Cu 3 Ce 1 catalyst has the lowest Cu reduction rate in DEA dehydrogenation Iminodiacetic acid reaction has better catalytic activity. The optimal reaction conditions of the catalyst are: m (DEA): m (OHOH): m (H2O) = 1.15:1.00:2.42, catalyst dosage 6 g, reaction temperature 180 ℃, reaction pressure 1.1 MPa and reaction time 4 h , The stirring speed was 600 r / min, the conversion of diethanolamine on Cu_3Ce_1 catalyst was 99.63%, the selectivity of iminodiacetic acid was 95.73%, and that of Cu_3Ce_1 catalyst was repeated 9 times without significant inactivation.