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以溶胶-凝胶法以及湿式浸渍法制备了Pt/TiO2催化剂,采用了XRD、BET、UV-vis、TEM、XPS等方法进行表征,并进行了对NO的催化氧化性能测试.结果表明铂的负载能显著提高TiO2光催化剂对NO的氧化转化能力和去除率.0.5%Pt/TiO2对NO的氧化率与去除率分别为45.0%和38.1%,与纯锐钛矿TiO2(13.6%,10.7%)相比,氧化效率提高3.3倍,去除效率提高3.6倍.通过比较不同方法制备的负载Pt催化剂的活性,初步讨论了催化剂表面发生的反应机理:铂氧化物以及催化剂表面吸附的O2分子通过与光生电子和光生空穴结合,产生了强氧化性自由基,将NO氧化得到NO2.
The Pt / TiO2 catalysts were prepared by sol-gel method and wet impregnation method. The catalysts were characterized by XRD, BET, UV-vis, TEM and XPS. The catalytic oxidation of NO was tested. The oxidative conversion and removal rates of NO (superscript 2 +) by TiO2 photocatalyst were significantly increased with the loading of 0.5% Pt / TiO2 at 45.0% and 38.1%, respectively, compared with pure anatase TiO2 (13.6% and 10.7% The oxidation efficiency increased by 3.3 times and the removal efficiency increased by 3.6 times.By comparing the activity of supported Pt catalysts prepared by different methods, the reaction mechanism of the catalyst surface was discussed preliminarily: platinum oxide and O2 molecules adsorbed on the surface of the catalyst by Photoelectrons and photo-generated holes together, resulting in strong oxidizing free radicals, the NO oxidation NO2.