A series of CeO₂-SiO₂ (CS) mixed oxides with different textural properties were prepared by sol-gel methodology using different synthesis temperatures (STemps) in order to investigate the influence of the CS mixed oxide support on the NH₃-SCO activity for Pt/CS catalysts. The results showed that the support material had a significant effect on catalytic activity. A Pt/CS catalyst, CS material synthesized at 40 °C (CS40) with a core-shell structure, high dispersion and good CeO₂ crystallinity, showed excellent NH₃ oxidation activity at low temperatures which was superior to the traditional Pt/Al₂O₃ tested. Characterization results showed that highly dispersed CeO₂ on SiO₂ with good CeO₂ crystallinity was favorable towards the formation of surface /lattice oxygen and medium strong acid both of which were important for the NH₃ oxidation reaction. This work suggests that the Pt/CS40 catalyst is a more suitable alternative to traditional lower layer Pt/Al₂O₃ catalyst for dual ammonia slip catalyst (ASC).

为了研究CS混合氧化物载体对NH ₃ -SCO活性的影响，采用溶胶-凝胶法用不同的合成温度（STemps）制备了一系列具有不同结构性质的CeO ₂ -SiO ₂（CS）复合氧化物。用于Pt / CS催化剂。结果表明，载体材料对催化活性具有显着影响。Pt / CS催化剂是在40°C合成的CS材料（CS40），具有核-壳结构，高分散性和良好的CeO ₂结晶度，在低温下表现出优异的NH ₃氧化活性，优于传统的Pt / Al ₂ Ø ₃经过测试。表征结果表明，高度分散的CeO ₂在SiO ₂具有良好的CeO ₂的结晶度是朝着表面/晶格氧和中等强酸的形成这两者都是重要的是，NH有利₃氧化反应。这项工作表明，Pt / CS40催化剂是传统的用于双氨逃逸催化剂（ASC）的下层Pt / Al ₂ O ₃催化剂的更合适替代品。