Cu-Ni/C催化剂的低温制备及其催化合成碳酸二甲酯的研究

Preparation of Cu-Ni/C Catalyst at Low Temperature for Synthesis of Dimethyl Carbonate(DMC)

采用氧化石墨(GO)作为碳素载体前驱体,金属氨配合物作为金属前驱体,用水合肼以低温液相还原的方式制备了碳负载铜镍合金催化剂(Cu-Ni/C)。通过FTIR、XRD、SEM、TEM和微反技术来研究催化剂的微观结构和反应性能。结果表明,90℃下还原得到碳负载的铜镍合金催化剂的合金粒径小于50 nm,能很好的分散于载体表面。在140℃,0.6 MPa的条件下,CH3OH和CO2在催化剂的金属活性位上发生反应,生成碳酸二甲酯(DMC),甲醇的最高转化率为4.2%,DMC的选择性达到84.5%。

Carbon supported copper-nickel alloy catalysts（Cu-Ni/C） were prepared by the low temperature hydrothermal reduction method.The Cu-Ni/C catalysts were characterized by FTIR,XRD,SEM and TEM analyses.The results indicated that the graphite oxide（GO） and metal precursors could be reduced at the same time.The TEM images showed that the alloy particles were well dispersed at the carrier surface with the size less than 50 nm for the catalyst synthesized at 90 ℃.The catalysis performances for direct syntheses of DMC form CO2 and CH3OH were investigated and the highest CH3OH conversion of 4.2% and the DMC selectivity of 84.5% could be achieved.