双金属NiCu/MgO催化剂上葡萄糖氢解制备高附加值C2-C4化学品（英文）

Hydrogenolysis of Glucose to Value-added C2-C4 Compounds over Bimetallic NiCu/MgO Catalysts

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.

A series of bimetallic NiCu/MgO catalysts with different Ni/Cu ratios were prepared by co-precipitation route. The structural properties of NiCu/MgO catalysts were determined by N2-physisorption, X-ray diffraction, temperature-programmed reduction and X-ray photoelectron spectroscopy. The results indicated that the synergetic effect of copper and nickel existed and the formation of NiMgO2 inhibited reduction of Ni species and formation of Cu-Ni alloy. The surface composition of the catalysts was significantly altered by adjusting Ni/Cu ratios and calcination temperatures. The hydrogenolysis of glucose was employed for evaluating the catalytic performance of the bimetallic NiCu/MgO catalysts. It was found that the bimetallic cata- lysts exhibited higher activity for the hydrogenolysis of glucose to C2-C4 products and 1,2-PD compared to the monometallic catalyst, due to the synergistic effect between Cu and Ni.