以类水滑石为前躯体的铜镍基催化剂催化糠醛液相加氢

该文以类水滑石为前驱体经500℃焙烧得到铜镍基催化剂(Cu11.2Ni4.7-MgAlO)及相应的单组分铜基(Cu11.2-MgAlO)或镍基催化剂(Ni4.7-MgAlO),并采用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.以糠醛液相加氢为探针反应,考察了3种催化剂的催化性能,并详细研究了催化剂还原活化温度、加氢反应温度、加氢压力、反应时间及催化剂用量等工艺条件对Cu11.2Ni4.7-MgAlO催化糠醛液相加氢反应的影响.结果表明,Cu11.2Ni4.7-MgAlO的催化性能均优于Cu11.2-MgAlO和Ni4.7-MgAlO;在最佳反应条件下,以Cu11.2Ni4.7-MgAlO为催化剂的糠醛转化率和糠醇选择性均可分别达到95.6%和93.1%,Cu11.2Ni4.7-MgAlO循环使用6次后,催化性能无明显下降,具有较好的稳定性.

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

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.