采用溶胶凝胶法及程序升温碳化法制备了K改性的Ni/β-Mo2C催化剂，通过XRD、N2吸附-脱附分析和TEM等手段表征了催化剂的织构特征。考察了K含量对Ni/β-Mo2C催化剂CO加氢合成低碳醇反应性能的影响。实验结果表明：K改性Ni/β-Mo2C具有较高的CO加氢反应活性，产物以C1-4烷烃为主；适量K助剂的引入能大大提高催化剂的比表面积，有利于提高催化剂的合成低碳醇能力；过量K助剂的引入降低了催化剂的比表面积且与Mo形成了惰性的K2MoO4，降低了催化剂的活性。%K doped Ni/β-Mo2C catalysts were prepared by sol-gel method and temperature programmed carburization method, and their structure and morphology were characterized by XRD, BET and TEM. The effect of K amount on the catalytic behavior of the catalysts for hydrogenation of CO to higher alcohols was investigated in a fixed bed reactor. The results showed that the K doped Ni/β-Mo2C catalysts exhibited high activity for CO hydrogenation reaction and C1-4 alkanes were the main products. The addition of an appropriate amount of K could greatly increased the surface area of the Ni/β-Mo2C catalysts and enhanced both activity and selectivity towards C2 + alcohols. However, when an excessive amount of K was added, the surface area of the catalysts decreased and inert K2MoO4 was formed, which resulted in the decrease of the catalytic activity.
展开▼
