以MnSO_4和KMnO_4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完伞转化温度为80℃.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 MnSO_4 and KMnO_4 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.
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