不同前驱体制备的Pt/CuO室温催化氧化甲醛性能的研究

Catalytic oxidation of formaldehyde at room temperature over Pt/CuO catalyst prepared from different precursors

本文采用浸渍-还原法制备了纳米CuO负载贵金属Pt复合催化剂(Pt/CuO),并探讨了其在室温催化氧化甲醛方面的应用。运用X射线衍射(XRD)、扫描电镜(SEM),傅里叶变换红外光谱仪(FTIR)和热重(TG)等手段对所制备的Pt/CuO催化剂进行了表征和分析。研究表明前驱体对Pt/CuO催化剂室温去除甲醛性能影响很大,其中以CuCl2·2H2O和聚乙二醇20000为前驱体制备的Pt/CuO具有最好的室温去除甲醛活性,这可能与其纳米片结构和丰富的表面羟基等有关。原位红外结果表明甲酸盐和DOM是Pt/CuO催化剂催化分解甲醛的主要产物。

CuO supported Pt catalysts (Pt/CuO) were prepared via an impregnation-reduction method and characterized by means of X-ray diffraction (XRD),SEM,Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TG).The results showed that the precursors had a significant influence on the performance of the catalysts toward HCHO oxidation at room temperature.Pt/CuO prepared from CuCl 2·2H 2O and polyethylene glycol 20000 exhibited the highest activity,mainly due to its nanoflake structure and abundance of surface hydroxyls.Moreover,the in situ DRIFTS result revealed that formate and DOM species were the major intermediates during the catalytic decomposition of HCHO over the Pt/CuO catalyst at room temperature.