A series of Pt/CeO₂-TiO₂ catalysts (0.5 wt.% Pt) with size-controllable Pt nanoparticles were prepared by a modified ethylene glycol reduction method and the Pt particle size effect of Pt/CeO₂-TiO₂ catalysts on benzene and 1,2-dichloroethane (DCE) degradation was investigated. It reveals that the metal-support interaction of PtO_x species and CeO₂-TiO₂ mixed oxides is enhanced by the reduced Pt particle sizes. The formation of more Pt²⁺ species and stronger redox properties at low-temperature resulted by the enhanced metal-support interaction of Pt/CeO₂-TiO₂ catalysts both greatly promotes the deep oxidation for benzene and C₂H₃Cl byproduct during DCE degradation at low temperature. Pt/CeTi-11 with the smallest average Pt particle size (1.53 nm) exhibits the highest activity among all the catalysts for benzene degradation, with T_90% of only 152 °C (1000 ppm, GHSV=15000 h^-1). However, more acidic sites (especially the strong acid) were formed on the Pt/CeO₂-TiO₂ catalysts with bigger Pt nanoparticle (>2.95 nm), contributing to activate and convert DCE to C₂H₃Cl. More importantly, Pt/CeO₂-TiO₂ catalysts are extremely stable in DCE degradation reaction, and have been scarcely influenced by the presence of benzene and water in the feed gases.

通过改进的乙二醇还原法制备了一系列具有可控制尺寸的Pt纳米颗粒的Pt / CeO ₂ -TiO ₂催化剂（0.5 wt。％Pt），并且Pt / CeO ₂ -TiO ₂催化剂对苯的Pt粒径效应研究了1,2-二氯乙烷（DCE）的降解。结果表明，PtO _x物种与CeO ₂ -TiO ₂混合氧化物的金属-载体相互作用通过减小Pt粒径而得到增强。Pt / CeO ₂ -TiO _2的金属-载体相互作用增强，在低温下形成更多的Pt ²⁺物种并具有较强的氧化还原性能。催化剂在低温下DCE降解过程中都极大地促进了苯和C ₂ H ₃ Cl副产物的深度氧化。在所有的苯降解催化剂中，具有最小平均Pt粒径（1.53 nm）的Pt / CeTi-11表现出最高的活性，T _90％仅为152°C（1000 ppm，GHSV = 15000 h ^-1）。但是，在具有更大Pt纳米颗粒（> 2.95 nm）的Pt / CeO ₂ -TiO ₂催化剂上，形成了更多的酸性位点（尤其是强酸），有助于活化DCE并将其转化为C ₂ H ₃ Cl。更重要的是，Pt / CeO ₂ -TiO ₂ 催化剂在DCE降解反应中非常稳定，几乎不受原料气中苯和水的影响。