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Effect of rare earth and other cationic promoters on properties of CoMoN_x/CNTs catalysts for ammonia decomposition

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【作者】 赵朝晖； 邹汉波； 林维明；

【Author】 ZHAO Zhaohui 1,2,*,ZOU Hanbo 1,LIN Weiming 1,2(1.School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,China;2.School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510641,China)

【机构】 School of Chemistry and Chemical Engineering,Guangzhou University； School of Chemistry and Chemical Engineering,South China University of Technology；

【摘要】 Carbon nanotubes(CNTs)supported Co-Mo nitride catalysts were prepared by incipient-wetness impregnation method and temperature-programmed reaction in N2-H2 mixed gases.The effects of cationic promoters(K,Ba,La,Ce and Zr)on the catalytic performance and surface properties were investigated.All samples were characterized by N2 physical adsorption,X-ray diffraction,and temperature-programmed reduction of H2.The results showed that the addition of promoters reduced the crystallite size of Mo2N and Co3Mo3N species and increased their surface area and dispersion.Among the catalysts,the La promoted CoMoNx/CNTs catalyst had the highest ammonia conversion which could reach 97.63% at 600 oC.

【Abstract】 Carbon nanotubes(CNTs)supported Co-Mo nitride catalysts were prepared by incipient-wetness impregnation method and temperature-programmed reaction in N2-H2 mixed gases.The effects of cationic promoters(K,Ba,La,Ce and Zr)on the catalytic performance and surface properties were investigated.All samples were characterized by N2 physical adsorption,X-ray diffraction,and temperature-programmed reduction of H2.The results showed that the addition of promoters reduced the crystallite size of Mo2N and Co3Mo3N species and increased their surface area and dispersion.Among the catalysts,the La promoted CoMoNx/CNTs catalyst had the highest ammonia conversion which could reach 97.63% at 600 oC.

【关键词】 promoters； Co-Mo nitride； carbon nanotubes； ammonia decomposition； rare earths；
【Key words】 promoters； Co-Mo nitride； carbon nanotubes； ammonia decomposition； rare earths；
【基金】 Project supported by National Natural Science Foundation of China (20806017);Natural Science Foundation of Guangdong Province (10151009101000009)
  • 【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2013年03期
  • 【分类号】O643.36
  • 【被引频次】10
  • 【下载频次】49
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