作　　者： ; ; ; ; ; ;

机构地区： 华东理工大学化学与分子工程学院结构可控先进功能材料及其制备教育部重点实验室

出　　处： 《无机化学学报》 2006年第7期1210-1214,共5页

摘　　要： 本文以蜂窝状堇青石陶瓷为催化剂载体,用分步浸渍法制备了挥发性有机废气(VOCs)净化用Pd-Ni/La-Ce-Zr-Al2O3/堇青石催化剂,考察了Ni助催化剂对单钯型VOCs净化催化剂性能的影响,并用H2-TPR、比表面、XRD、SEM等手段对催化剂进行了表征。研究表明,Ni的加入明显提高了催化剂的低温活性和热稳定性,经过800℃焙烧的Pd-Ni/La-Ce-Zr-Al2O3/堇青石(mPd∶mNi=3∶20)催化剂的催化性能明显优于Pd/La-Ce-Zr-Al2O3/堇青石催化剂,甲苯起燃温度下降约25℃,经1000℃高温处理后,仍能保持优良的催化性能。Ni的加入使Pd催化剂性能提高的原因应归结于活性组分分散度的提高和钯、镍与载体之间存在的强相互作用。 Pd-Ni / La-Ce-Zr-Al2O3 cordierite monolith catalyst for destractive removal of volatile organic gases was prepared by the step-impregnation method and characterized by H2-TPR, automatic N2 adsorption and desorption, XRD and SEM technologies, and the promotion of Ni on the performance of Pd-only combustion catalyst was investigated. The results show that the presence of Ni improves obviously the catalytic activity and thermal stability of the Pd-only combustion catalyst. The Pd-Ni/La-Ce-Zr-Al2O3/cordierite monolith catalyst （mpdmNi=3：20） calcined at 800 ℃ performed much better than Pd/La-Ce-Zr-Al2O3/cordierite monolith catalyst for the deep oxidation of toluene, for example, the light-off temperature of toluene over Pd-Ni catalyst is lower -25 ℃ than that over Pdonly catalyst, and it has high thermal stability even after pre-treated at 1 000℃. Addition of Ni promotes the catalytic activity and thermal stability of the supported Pd-only catalyst by active components highly dispersed on the surface of catalyst and strong metal-support interactions between palladium, nickel and the support.

关 键 词： 钯 镍催化剂 废气净化 甲苯氧化 高温稳定性

领　　域： [理学] [理学] [理学] [理学]