Mo负载量对γ-MoN_xC_y/活性半焦甲烷化性能的影响  

Effect of Mo Loadings on the Catalytic Performance of Activated Semi-coke Supported γ-MoN_xC_y for Methanation

作　　者：霍晓东 陈震 房倚天[3] 

机构地区：[1]山西煤炭进出口集团科学技术研究院有限公司,太原博士工程师030006 [2]山西煤炭进出口集团博士后科研工作站,太原高级工程师030006 [3]中国科学院山西煤炭化学研究所煤转化国家重点实验室

出　　处：《煤炭转化》2018年第2期38-43,共6页Coal Conversion

基　　金：中国科学院战略性先导科技专项项目(XDA07050100)

摘　　要：将六次甲基四胺(HMT)和钼酸铵(AHM)的络合物与霍林河(HLH)脱灰煤机械混合,然后通过一步焙烧制备了不同金属负载量的钼基碳化物与活性半焦(activated semi-coke,ASC)的复合材料.采用XRD,SEM,HRTEM,XPS,H_2-TPSR及元素分析等方法对催化剂进行了表征,考察了金属负载量对催化剂形貌以及甲烷化反应性能的影响.结果表明:随着金属负载量的增加,金属活性组分Mo的分散度变差以及存在形态发生变化;CO转化率随着金属负载量的增加而逐渐增大,但是增大趋势变缓;单位质量Mo上的CO转化速率随着金属负载量的增加而逐渐减小;样品20%Mo/ASC由于具有较好的本征催化活性以及最大的催化加氢热解速率,使其具有最高的甲烷选择性.The composite materials of molybdenum carbides supported on activated semicoke with different Mo loadings were prepared by thermal decomposition of the mixture of HLH de-ashed lignite and the complex of hexamethylentetramine(HMT)and ammonium molybdate(AHM).The synthesized catalysts were characterized by XRD,SEM,HRTEM,XPS,H_2-TPSR and the effects of Mo loadings on methanation were evaluated.The results show that the dispersion of Mo decreased and the configuration of Mo changed with the increase of Mo loadings.The conversion of CO increase,while the tendency of increase is reduce with the increase of Mo loadings.The conversion rate of CO on unit mass of Mo decreases with the increase of Mo loadings.The selectivity of CH_4 is best on the sample of 20%Mo/ASC due to the better intrinsic catalytic activity and the highest rate of catalytic hydropyrolysis.

关 键 词：钼基碳化物 活性半焦 Mo负载量 甲烷化 催化加氢 

分 类 号：O643[理学—物理化学]