Cu/CeO2催化剂催化二乙醇胺脱氢制亚氨基二乙酸

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。

Dehydrogenation of Diethanolamine to Iminodiacetic Acid over Cu/CeO2 Catalysts

A series Cu/CeO2 catalysts were prepared by co-precipitation method. The structure and reduction properties of the catalysts were characterized by physical adsorption(BET), X-ray diffraction(XRD) and H2 temperature programmed reduction(H2-TPR). The catalytic performance of Cu/CeO2 catalysts was investigated for diethanolamine dehydrogenation to iminodiacetic acid. The results showed that Cu3Ce1 catalyst calcined at 500oC with Cu:Ce mole ratio of 3:1 had low reduction temperature, appropriate Cu0 active centers and high catalytic performance for diethanolamine dehydrogenation of iminodiacetic acid. Under the reaction condition of m(DEA):m(NaOH):m(H2O)=1.15:1:2.42, 6g CuO/CeO2 used,reaction temperature of 180oC, reaction pressure of 1.1MPa, reaction time of 4h and rotational speed of 600r/min, the conversion of diethanolamine reached 99.63% and the selectivity of iminodiacetic acid was 95.73%.