以类水滑石为前躯体的铜镍基催化剂催化糠醛液相加氢

Furfural Liquid-phase Hydrogenation over CuNi-based Catalysts Derived from Hydrotalcite-like Precursors

摘要:

本文采用共沉淀法制备了Cu-Ni类水滑石(Cu11.2Ni4.7-MgAl)，以其为前驱体经500 oC焙烧后得到铜镍基催化剂(Cu11.2Ni4.7-MgAlO)，应用于糠醛液相加氢反应，并与相应单组分铜基或镍基催化剂的催化性能。以Cu11.2Ni4.7-MgAlO为催化剂详细考察了还原活化温度以及加氢反应温度、加氢压力、反应时间、催化剂用量等工艺条件对糠醛液相加氢反应的影响，并对其催化稳定性进行了考察。本文同时采用X-射线粉末衍射(XRD)、程序升温还原(H2-TPR)等技术对催化剂进行了表征。结果表明，铜镍基催化剂中的活性组分Cu和Ni在糠醛加氢反应中存在协同催化效应，在适宜糠醛液相加氢反应条件下，以Cu11.2Ni4.7-MgAlO为催化剂糠醛转化率和糠醇选择性均可达到90%以上，该催化剂的稳定性较好，循环使用6次后，其催化性能无明显下降。

Abstract:

The Cu, Ni-containing hydrotalcite-like precursors were synthesized by co-precipitation, and calcined at 500 oC to obtain the Cu-Ni-based catalysts for furfural (FFR) liquid-phase hydrogenation in the present work. And at the same time, their catalytic properties were also compared with the corresponding Cu-based or Ni-based catalysts, and the effects of reduction activation temperature, hydrogenation temperature, H2 pressure, reaction time and catalyst amount on furfural catalytic hydrogenation were further investigated in details. The used catalysts were also characterized by XRD and H2-TPR techniques. The results showed that Cu and Ni species in catalysts possessed synergistic effect on the furfural hydrogenation. Both furfural conversion and furfuryl alchol selectivity over Cu11.2Ni4.7-MgAlO catalyst could reach up to above 90%, and its catalytic activity had no obvious decrease after being reused 6 times.