Pd/ZSM-5/堇青石整体式催化剂对甲苯的催化降解性能研究  

Study on catalytic performance of Pd/ZSM-5/cordierite monolithic catalyst for degradation of toluene

作　　者：杨玉玲 周家斌 陈东 刘速 YANG Yu-ling;ZHOU Jia-bin;CHEN Dong;LIU Su(College of Chemistry&Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China;Sichuan Academy of Environmental Sciences,Chengdu 610041,China)

机构地区：[1]西南石油大学化学化工学院,四川成都610500 [2]四川省生态环境科学研究院,四川成都610041

出　　处：《现代化工》2021年第7期169-173,共5页Modern Chemical Industry

基　　金：四川省科技厅重大科技专项(2019YFS0495)。

摘　　要：以蜂窝状堇青石为载体,采用聚乙烯醇(PVA)溶液辅助涂覆法制备Pd/ZSM-5/堇青石整体式催化剂,利用XRD、N2吸附-脱附、SEM等方法对催化剂结构和性质进行表征。通过气相色谱分析催化剂对甲苯降解效果,考察了Pd的质量分数、堇青石煅烧时间及浆料涂覆次数对催化降解甲苯性能的影响。结果表明,ZSM-5分子筛具有较大比表面积,能有效负载Pd,在粘结剂的作用下与堇青石载体有效结合;制备的5%Pd/ZSM-5/堇青石对甲苯的催化降解效果最好,T_(50)和T_(90)分别为275℃和313℃;堇青石焙烧时间4 h的催化效果最好;负载5%Pd质量分数的分子筛对堇青石涂覆6次时性能最优,制备的Pd/ZSM-5/堇青石整体式催化剂显示出良好的催化氧化甲苯活性。Pd/ZSM-5/cordierite monolithic catalyst is prepared with honeycomb cordierite as carrier via PVA solution assisted coating method. The structure and properties of the catalyst are characterized by XRD,N2 adsorptionadsorption and SEM. The performance of the catalyst for toluene degradation is investigated by means of gas chromatography.Effects of mass fraction of Pd,calcination time of cordierite and times of slurry coating on degradation of toluene over the catalyst are studied. Results show that ZSM-5 molecular sieve has a large specific surface area to load effectively Pd and bond with cordierite carrier under the action of binder.The prepared 5%Pd/ZSM-5/cordierite catalyst has the optimal catalytic activity for degradation of toluene.T_(50) and T_(90) are 275℃ and 313℃,respectively.It is shown that the catalyst has the best catalytic performance if cordierite has been calcined for 4 h. The catalyst with the optimal performance can be obtained if cordierite has been coated by ZSM-5 molecular sieve loaded with 5% Pd for 6 times.The prepared Pd/ZSM-5/cordierite monolithic catalyst shows a favorable catalytic activity for oxidation of toluene.

关 键 词：堇青石蜂窝陶瓷 Pd/ZSM-5分子筛 催化氧化 甲苯 

分 类 号：X511[环境科学与工程—环境工程]