铂、钯负载型活性催化剂的制备及其对一氧化碳的催化氧化活性

用浸渍法分别将铂、钯负载在铝柱撑蒙脱石载体上,制备了铂、钯负载铝柱撑蒙脱石催化剂。运用X射线衍射(XRD)、原子吸收光谱(AAS)、透射电镜(TEM)等分析方法对样品的性能和结构进行了表征,并考察了不同铂、钯负载量的催化剂对一氧化碳的催化氧化性能。结果表明,铂、钯均以高度分散的纳米粒子状态均匀分布在载体表面,并表现出良好的CO催化氧化活性。铂、钯在铝柱撑蒙脱石载体表面的有效负载率在70%~76%之间,在相同的设计负载量条件下,铂的实际负载量和有效负载率均略大于钯。CO催化氧化试验结果表明,相对于负载前,负载后催化剂的催化活性明显增加,且其催化活性随着铂、钯负载量的增加而不断增强。在相同温度和负载量条件下,钯负载型催化剂的催化活性明显高于铂负载型催化剂。

Preparation of Platinum or Palladium Supported Active Catalyst and Catalytic Activity to CO Oxidation

Pt-supported Al Pillared Montmorillonite and Pd-supported Al Pillared Montmorillonite were prepared by impregnation method. By using X-ray diffraction （XRD）, atomic absorption spectroscopy （AAS）, and transmission electron microscopy （TEM）, properties and structure of samples were characterized. CO catalytic oxidation performance of different deposition of Pt or Pd were investigated. The results showed that Pt or Pd showed good catalytic activity on CO oxidation in a highly dispersed state of uniform distribution on Al Pillared Montmorillonite carrier. Platinum or palladium on Al Pillared Montmorillonite carrier had effective load rate of 70%-76%. Under the same amount of design load conditions, the actual load amount and effective load rate of platinum was slightly more than that of palladium. By experimental results of CO catalytic oxidation compared with that before-loading, catalytic activity of the after-loading catalysts was significantly inproved and increased. Under the condition of same temperature and deposition, catalytic activity of Pd-supported catalyst was significantly higher than that of Pt-supported catalyst.