K改性Ni/β-Mo_2C催化剂用于CO加氢反应研究  

Preparation of K doped Ni/β-Mo_2C and its performance for CO hydrogenation

作　　者：赵立红 闫捷 魏灵朝 蒋元力 房克功[2] 孙予罕[3] 

机构地区：[1]河南能源化工集团研究院有限公司,河南郑州450046 [2]中国科学院山西煤炭化学研究所,山西太原030001 [3]中国科学院上海高等研究院,上海201210

出　　处：《天然气化工—C1化学与化工》2015年第4期19-23,共5页Natural Gas Chemical Industry

基　　金：国家自然科学基金重大项目(20590363)

摘　　要：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K2Mo O4,降低了催化剂的活性。K doped Ni/β-M02C 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-M02C catalysts exhibited high activity for CO hydrogenation reaction and Ci-4 alkanes were the main products. The addition of an appropriate amount of K could greatly increased the surface area of the Ni/β-M02C 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.

关 键 词：Ni/β-Mo2C催化剂 K改性 溶胶-凝胶法 CO加氢 低碳醇 

分 类 号：TQ426[化学工程] TQ223.12