稀土改性甲烷分解制氢Ni-Al催化剂制备及表征  

Preparation and Characterization of Rare Earth Modified Ni-Al Catalysts for Hydrogen Production from Methane Catalytic Decomposition

作　　者：崔梅生[1] 于瀛[2] 侯永可[1] 赵娜[1] 龙志奇[1] 施用晞[2] 

机构地区：[1]北京有色金属研究总院有研稀土新材料股份有限公司,北京100088 [2]北京化工大学理学院,北京100029

出　　处：《中国稀土学报》2009年第4期483-488,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家十一五"863"(2006AA06Z347)项目资助

摘　　要：采用化学湿法共沉淀制备了Cu和不同稀土(RE=La,Ce,Nd,Y)改性的甲烷分解制氢Ni-Al催化剂,并对催化剂进行了BET,XRD,TPR,SEM,TEM等技术表征和催化制氢性能评价。研究结果表明,稀土是比铜更理想的改性剂,稀土改性对催化剂具有良好热稳定作用,并提高催化制氢高温活性,La改性效果最佳;稀土改性催化剂具有较高的制氢稳定性能,700℃下连续制氢12h后未出现失活。稀土改性可促进纳米碳管形成,大幅改善纳米碳形貌,并对固态碳有较强的抑制作用。Ni-Al catalysts modified by Cu, La, Ce, Nd, and Y for hydrogen production from methane decomposition were synthesized with a chemical wet coprecipitation. The catalysts were characterized by the means of BET, XRD, SEM, TEM and TPR techniques. And the hydrogen production performance was also tested. The results showed that the rare earth was a novel and ideal modification agent better than Cu.The hydrogen production performance of Ni-Al catalysts was enhanced by rare earth modification, especially for the thermal stability. The La modified sample was the best Ni-Al catalyst. The rare earth modified catalysts showed a stable hydrogen production capacity, which provided high performance in the duration of twelve hours for continuous hydrogen production under 700 ℃. In addition, the rare earth modification was helpful to the rich nano-tube carbons formation and resistant to the solid carbons.

关 键 词：稀土改性 催化剂 制氢 甲烷分解 

分 类 号：O643[理学—物理化学] TQ426[理学—化学]