添加水蒸气对CH_4-CO_2重整催化剂Ni/CeO_2-ZrO_2-Al_2O_3中Ni组分结构影响的EXAFS研究  

EXAFS study of the influence on structures of Ni in Ni/CeO_2-ZrO_2-Al_2O_3 catalyst for CO_2 reforming of CH_4 reaction by adding vapor

作　　者：李春林[1] 伏义路[1] 孟明[1] 卞国柱[1] 谢亚宁[2] 胡天斗[2] 张静[2] 

机构地区：[1]中国科学技术大学化学物理系,合肥230026 [2]中国科学院高能物理研究所,北京100039

出　　处：《核技术》2002年第10期879-882,共4页Nuclear Techniques

摘　　要：采用水热合成法制备了Ni/CeO2 -ZrO2 -Al2 O3催化剂。进行了添加和不添加水蒸气的CH4 -CO2 催化重整反应 ,测量了积碳量 ,并用EXAFS手段测试了催化剂Ni的K吸收边。结果表明 ,反应前后最近邻Ni-Ni配位距离无明显变化 ,而配位数却变化明显。无水蒸气反应后Ni-Ni配位数有较大幅度的减少 ;而添加了水蒸气 ,Ni-Ni配位数比反应前减少幅度小。水蒸气的添加能减少积碳量 ,稳定催化剂中Ni的结构 。Ni/CeO 2-ZrO 2-Al 2O 3 catalysts were prepared using hydro-thermal method. CO 2 reforming of CH 4 reactions were carried out with or without vapor. The amount of carbon deposit and the EXAFS of K-edge of Ni were measured. The result shows that the nearest Ni-Ni coordination distances do not change obviously, but the coordination numbers of the nearest Ni-Ni shell change obviously. The nearest Ni-Ni coordination number reduces largely after reaction without vapor. For the condition of accession of vapor, the nearest Ni-Ni coordination numbers reduce much smaller than that of without vapor. The accession of vapor can reduce the amount of carbon deposit, stabilize the Ni structure, and thereby increase the stability of CO 2 reforming of CH 4 reaction.

关 键 词：CH4 CO2 CEO2 ZRO2 Al2O3 Ni组分 水热合成法 铈锆固熔体 催化剂 EXAFS 水蒸汽 合成气 氧化铝 镍 二氧化铈 甲烷 二氧化碳 氧化锆 

分 类 号：TE665.3[石油与天然气工程—油气加工工程] O643.36[理学—物理化学]