不同方法制备的Ni修饰介孔碳负载的β-Mo2C催化CO加氢反应制备混合醇

通过浸渍法和碳热还原法制备了以K2CO3为助剂、以Ni修饰介孔碳为载体的碳化钼(β Mo2C)催化剂。在合成气原料比n〖DK〗(H2)/n〖DK〗(CO)=10、反应压力p=80 MPa、合成气气体空速GHSV=3000 h-1和反应温度T=300℃的反应条件下，进行了β Mo2C催化CO加氢反应制备混合醇的催化反应评价。评价结果表明，镍/介孔碳（Ni/NC）载体的不同制备方法对β Mo2C催化合成低碳混合醇催化性能有显著影响。由软模板一步法制备的前驱体OSM Ni/NC组成的催化剂K β Mo2C OSM Ni/NC的总醇选择性（400%）高于由软模板浸渍法制备的前驱体IM Ni/NC 组成的催化剂K β Mo2C IM Ni/NC的总醇选择性（285%），其原因是前者的活性组分分散度高且在孔道内部分布较多，并且前者中存在的Mo084Ni016相比后者中存在的MoNi4对低碳醇生成的促进作用更强。

β-Mo2C Catalysts Supported on Ni Modified Mesoporous Carbon Perpared by Different Methods and Their Application in CO Hydrogenation to Synthesize Mixed Alcohol

β Mo2C catalysts are promoted by K2CO3 and supported on nickel modified mesoporous carbon (Ni/NC) by incipient wetness impregnation and following carbothermal reduction method. At n(H2)/n(CO)=10, p=80 MPa, GHSV=3000 h-1and T=300℃, catalytic performance of the catalysts was evaluated by the synthesis of mixed alcohols from syngas. Results show that different preparation methods of ordered mesoporous carbon/nickel precursor exhibit remarkable impacts on catalytic performance for synthesizing mixed alcohols. It is found that the K β Mo2C OSM Ni/NC (400% total alcohol selectivity) catalyst comprised of OSM Ni/NC supports prepared by one pot soft template method presents higher catalytic performance in alcohols selectivity than that of K β Mo2C IM Ni/NC catalyst (285% total alcohol selectivity) consisted of IM Ni/NC supports prepared by soft template method and incipient wetness impregnation method. That is because the β Mo2C OSM Ni/NC has higher dispersion of active species on supports, making more active sites distributed inside the pores. In addition, the Mo084Ni016 phase in β Mo2C OSM Ni/NC catalyst shows better promotion effect than the MoNi4 phase in β Mo2C IM Ni/NC.