OMS-2的制备及其负载PdO对CO氧化的催化活性  

Preparation of Manganese Oxide Octahedral Molecular Sieve and Catalytic Activity of Its Supported PdO for CO Oxidation

作　　者：刘雪松[1] 鲁继青[1] 王晓霞[1] 罗孟飞[1] 

机构地区：[1]浙江师范大学物理化学研究所先进催化材料省部共建教育部重点实验室,浙江金华321004

出　　处：《催化学报》2010年第2期181-185,共5页

基　　金：国家自然科学基金(20473075)

摘　　要：以MnSO4和KMnO4为前驱体,采用回流法在酸性介质中合成了氧化锰八面体分子筛(OMS-2).以OMS-2为载体采用浸渍法制备了PdO/OMS-2催化剂,并对催化剂进行了表征和CO氧化活性测试.结果表明,OMS-2为纳米棒结构,是典型的隐钾锰矿(cryptomelane)结构.当PdO负载量≤1.0%时,PdO以高分散的形式存在,而更高负载量时形成PdO晶相.当PdO负载量为2.5%时,PdO/OMS-2催化剂上CO氧化反应活性最高,CO完全转化温度为80oC.催化剂中高分散的PdO和高价态的Pd物种是反应的活性中心.A manganese oxide octahedral molecular sieve （OMS-2） was synthesized using MnSO4 and KMnO4 as precursors by a reflux method under acidic conditions. PdO supported on OMS-2 （PdO/OMS-2） was prepared and tested for CO oxidation. The results showed that the OMS-2 molecular sieve was in the form of nano-rods and had typical structure with cryptomelane. PdO was highly dispersed when the PdO loading was lower than 1.0%, while crystalline PdO formed at higher PdO loading. The 2.5%PdO/OMS-2 catalyst was most active for CO oxidation with 100% conversion of CO at 80℃. The highly dispersed PdO species and Pd species with high oxidation state were the active sites for the reaction.

关 键 词：氧化锰八面体分子筛 氧化钯 负载型催化剂 一氧化碳 催化氧化 二氧化碳 

分 类 号：O643.36[理学—物理化学]