Mg改性纳米线碳化钼在CO加氢反应中的应用  

Preparation of Mg doped nanowire β-Mo_2C and its performance for hydrogenation of carbon monoxide

作　　者：刘长城[1,2] 林明桂[1] 姜东[1] 房克功[1] 孙予罕[3] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院大学,北京100039 [3]中国科学院上海高等研究院,上海201203

出　　处：《天然气化工—C1化学与化工》2014年第3期36-41,共6页Natural Gas Chemical Industry

基　　金：国家重点基础研究发展计划(2005CB221402);国家高技术研究发展计划项目(2012AA051002);国家自然科学基金资助项目(21103217);中国科学院战略性先导技术专项(XDA01020304)

摘　　要：以1,6-己二胺和钼酸铵为前躯体，采用有机-无机杂化法及后续的程序升温碳化法制备了纳米线β-Mo2C。通过机械混合法制备了镁改性的β-Mo2C催化剂并考察了其在CO加氢反应中的催化性能。结果表明，镁的改性对纳米线碳化钼的织构性质没有明显的影响，但在CO加氢反应中显著提高了CO转化率，且提高了烷烃的选择性及其链增长能力，表现为抑制了甲烷而促进了C2-C5烷烃的生成。但是Mg的添加对醇选择性及链增长能力影响不明显。β-Mo2C nanowires were prepared by an organic-inorganic hybrid method with 1,6-hexamethylenediamine and ammonium molybdate as precursors, then modified with magnesium by mechanical mixing. The performances of the prepared Mg-doped nanostructuredβ-Mo2C catalysts for hydrogenation of CO were investigated. The results showed that the doping of MgO did not alter the textural properties of the catalysts, but increased CO conversation, improved the selectivity to hydrocarbons and promoted hydrocarbon chain growth, which resulted in that the formation of methane was inhibited and the yield of C2-C5 alkanes increased. However, the selectivity towards alcohols and the ability of alcohol chain growth almost unchanged.

关 键 词：碳化钼 纳米线 镁改性 有机-无机杂化法 CO加氢 

分 类 号：O643[理学—物理化学] TQ426[理学—化学]