PdO/纳米Ce_(0.6)Zr_(0.35)Y_(0.05)O_2上甲烷催化氧化性能研究  

Investigation on Catalytic Behaviors of PdO/Nano-Ce_(0.6)Zr_(0.35)Y_(0.05)O_2 in Methane Oxidation

作　　者：张玉娟[1] 牛建荣[1] 王国志[1] 李冬[1] 戴洪兴[1] 何洪[1] 邱文革[1] 

机构地区：[1]北京工业大学环境与能源工程学院化学化工系催化化学与纳米科学研究室,北京100022

出　　处：《中国稀土学报》2006年第z2期1-5,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家人事部与北京市高层次留学回国人员科技活动择优资助项目(国人部发[2004]99号和京人发[2004]111号);北京工业大学博士科研启动基金项目(KZ0502200301)

摘　　要：采用以十六烷基三甲基溴化铵(CTAB)为模板剂的改进共沉淀法合成了高比表面积(129 m2.g-1)立方相Ce0.6Zr0.35Y0.05O2(CZY(CTAB)固溶体“菜花”状纳米粒子,并以此为载体利用浸渍法制备了PdO含量为4%~10%的催化剂,考察了其对甲烷氧化反应的催化活性。结果表明,4%~10%PdO/CZY(CTAB表现出很好的催化活性:在CH4/O2摩尔比1/4,空速50000 h-1和温度360℃的反应条件下,甲烷完全氧化成二氧化碳和水。以CZY-CTAB固溶体纳米粒子作载体担载PdO,可大大地减小甲烷转化率随温度变化的“滞后回线”现象。根据表征结果,认为这一优良催化性能与铈锆钇固溶体对活性相PdO的稳定作用及其较大的比表面积有关。High-surface-area(129 m^2·g^(-1)) cubic-structured cauliflower-shaped Ce_(0.6)Zr_(0.35)Y_(0.05)O_2(CZY-CTAB) solid solution nanoparticle were synthesized by using a modified co-precipitation strategy with hexadecyltrimethylammonium bromide as template,and the CZY-CTAB-loaded 4%～10% PdO catalysts were prepared using the impregnation method.The catalytic activities of these materials were examined for the oxidation of methane.It is found that 4%～10% PdO/CZY-CTAB exhibits good catalytic performance: under the conditions of CH_4/O_2 molar ratio 1/4,space velocity 50000 h^(-1) and reaction temperature 360 ℃,methane can be oxidized to CO_2 and H_2O.With the ceria-zirconia-yttria solid solution as a support for PdO,one can considerably decrease the hysteresis phenomenon of methane conversion versus temperature.The characterization results indicate that such a good catalytic performance is associated with the effect of the ceria-zirconia-yttria solid solution to the stabilization of active phase PdO and larger surface area.

关 键 词：甲烷氧化反应 铈锆钇固溶体 贵金属氧化物催化剂 滞后回线 稀土 

分 类 号：O643[理学—物理化学]