铈的引入对负载钯阳极氧化膜不锈钢丝网催化剂结构和性能的影响

摘要

A new type of 0.75%Ce-0.5%Pd/stainless steel wire mesh (SSWM) catalyst was prepared,and characterized by means of SEM and TPR techniques.The catalytic properties for deep oxidation of representative volatile organic compounds such as toluene,acetone and ethyl acetate were investigated with and without addition of cerium.The results show that a porous oxides film was presented on the surface of SSWM by anodic oxidation method and which results into a strong interaction between Pd and CeO_2.After addition of cerium in the supported Pd/SSWM catalyst,a sponge-like and flattering morphological variation was appeared on the oxide film surfaces.This typical structure is crucial for the fastness of Pd active sites.The complete oxidation temperature for toluene,acetone and ethyl acetate can be lowered to 200,240 and 260 ℃,respectively.This result was related with the adding of CeO_2 by which caused the morphological variation over oxides film.%通过阳极氧化技术制备了一种新型的0.75%Ce-0.5%Pd/不锈钢丝网催化剂.采用扫描电镜(SEM)和程序升温还原技术(TPR)对催化剂进行了表征.考察了稀土铈的引入对催化剂上甲苯、丙酮和乙酸乙酯氧化活性的影响,结果显示,在不锈钢丝网载体表面处理过程中引入阳极氧化技术,使之自组织生长了一层多孔氧化膜,提供了活性组分CeO_2和Pd相互作用的平台.氧化铈的引入,使不锈钢丝网载体表面的多孔氧化膜形成了独特的海绵状蜂窝结构,有利于活性组分Pd的分散锚定.0.75%Ce-0.5%Pd/不锈钢丝网催化剂对甲苯、丙酮和乙酸乙酯的完全转化温度分别为200,240和260℃,具有良好的催化消除活性.催化剂的反应活性与稀土CeO_2的引入及其在阳极氧化膜上形成独特的形貌有关.