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采用共沉淀法制备了不同Ni/Cu比的NiCu/MgO双金属催化剂,并通过N_2物理吸附、X射线衍射(XRD)、X射线光电子能谱(XPS)和程序升温还原等方法对NiCu/MgO催化剂结构进行表征.表征结果表明,Cu和Ni之间存在协同相互作用,NiMgO_2的存在抑制了镍物种的还原和Cu-Ni合金的形成,催化剂的Ni/Cu比和焙烧温度对其表面金属组成有非常重要的影响.以葡萄糖氢解反应为探针反应,考察了Ni/Cu比、焙烧温度、H_2压力、反应温度、反应时间等因素对NiCu/MgO催化性能的影响.研究表明相对于单金属催化剂,双金属催化剂对葡萄糖氢解生成C2-C4和1,2-PD具有较高的催化活性,这与铜镍之间的协同作用有关.
NiCu / MgO bimetallic catalysts with different Ni / Cu ratios were prepared by co-precipitation method. The NiCu / MgO bimetallic catalysts were characterized by N 2 physical adsorption, X-ray diffraction, X-ray photoelectron spectroscopy and temperature programmed reduction. The results show that there is a synergistic interaction between Cu and Ni, the presence of NiMgO_2 inhibits the reduction of nickel species and the formation of Cu-Ni alloy, the Ni / Cu ratio of catalyst and the calcination temperature on the surface metal composition Has a very important influence on the catalytic performance of NiCu / MgO catalyzed by hydrogenolysis reaction of glucose.It is found that the Ni / Cu ratio, the calcination temperature, the H 2 pressure, the reaction temperature and the reaction time on the catalytic performance of NiCu / Metal catalysts and bimetallic catalysts have high catalytic activity for the hydrogenolysis of glucose to C2-C4 and 1,2-PD, which is related to the synergistic effect between copper and nickel.