贵金属纤维催化剂的CH_4催化燃烧活性

为了得到活性高、成本低的CH4催化燃烧催化剂,制备了一种Pt、Pd负载在硅铝纤维棉载体上的催化剂,考察了CH4催化燃烧的活性及抗老化性能,研究了载体的组成、预处理方法及贵金属负载量对催化剂活性的影响.结果表明:利用淄博华岩耐火纤维公司生产的高铝型纤维棉作为载体制备的催化剂的活性最好;载体预处理方法影响催化剂活性,其中用质量分数为1%的盐酸常温浸泡30 min得到的纤维载体最佳;当负载的Pt的质量分数为1.5%,负载的Pd的质量分数为2%时,催化剂活性最好,1.5%Pt/Z3催化剂的CH4完全转化温度为600℃,2%Pd/Z3催化剂的CH4完全转化温度为450℃;2%Pd/Z3催化剂在800℃经过100 h老化后,其t50仅提高了50℃,该催化剂具有良好的抗老化性能.

Catalytic Combustion of Methane Over Noble Metals Supported on Fibers Catalysts

To get the high activity and low price methane combustion catalyst,a fiber-supported Pd or Pt combustion catalyst has been developed.The influences of fiber composition,pre-treatment process of support,and noble metal loading on the catalyst activity have been investigated.The thermal stability of catalysts has also been investigated.The experiment results have revealed as follows: 1) the catalytic activities of the Pt and Pd supported on the high alumina fiber of Huayan catalysts are higher than that supported on other fibers.2) The catalytic activity depends on the pre-treatment process,such as temperature,treatment time and concentration of HCl solution,and the best treatment condition is impregnation in HCl solution that the mass fraction is 1% for 30?min at room temperature.3) 1.5%Pt/Z3 and(2.0%Pd/Z3) catalysts possessed more activities than those with other loadings.The methane completed conversion has been obtained over 1.5%Pt/Z3 and 2.0%Pd/Z3 catalysts at temperatures of 600?℃ and 450?℃,respectively.4) 2.0%Pd/Z3 catalyst has high thermal stability,t_(50) only increases 50?℃ when 2.0%Pd/Z3 catalyst has been aged for 100?h at 800?℃.