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科学通报  2014 

介孔铁硅复合氧化物负载金对一氧化碳的低温催化氧化

DOI: 10.1360/csb2014-59-26-2615, PP. 2615-2620

Keywords: 介孔铁硅复合,氧化物,纳米金,一氧化碳,催化氧化,室内空气净化

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Abstract:

用水热法合成了含硅量高的介孔铁硅复合氧化物,通过碱液处理,除去部分氧化硅,得到含铁量高的复合材料.采用沉积-沉淀法制备了两种复合材料负载的Au催化剂,用于对一氧化碳(CO)的低温催化氧化.通过BET比表面积测定、X射线衍射(XRD)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)等技术对材料进行了表征.两种载体均具有很高的比表面积,且都为无定形结构.Au主要以单质态分散于无定形的介孔载体表面.高含硅量的载体不利于Au的负载,且其负载的Au催化剂活性差.但Au容易负载在高含铁量的载体上,且催化剂能在低温下实现CO的完全氧化.考察了不同的沉积-沉淀pH对负载量及活性的影响,结果表明,pH8条件下合成的催化剂Au负载量最高,且活性最好.

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