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中文摘要：
由于Pt/Ba/Al2O3型NOx储存-还原(NSR)催化剂抗硫性能差，因此有必要研发新的催化剂。本项目采用酸性复合氧化物为载体，以碱金属K代替Ba作为储存剂，制备了多个系列的NSR催化剂。首先研发了负载型NSR催化剂Pt/K/TiO2-ZrO2，考察了载体焙烧温度、K负载量、储存剂种类和载体效应等对催化剂储存、抗硫和再生性能的影响，并对储存机制进行了探讨，结果表明，800oC焙烧时催化剂具有最大的NOx储存量，储存能力与载体的表面性能和K物种形态密切相关，NOx主要是硝酸盐以及少量亚硝酸盐物种储存，不同K物种形成的硝酸盐的稳定性为K2CO3>氧化物>－OK基团，抗硫性能次序与此相反。助剂Co或Ce的加入能增强Pt/K/TiO2-ZrO2催化剂的氧化能力，从而显著提高其对NOx的储存能力，但抗硫性能略有下降。当在载体中添加Al2O3时NOx储存量和抗硫性能均明显提高，Al2O3的最佳掺杂量为Al/(Ti+Zr)原子比为3/1。此外，考察了TiO2-Al2O3-La2O3负载的NSR催化剂，发现掺杂少量La2O3能显著提高催化剂热稳定性，储存及抗硫性能，La2O3最佳掺杂量为3wt%。
结论摘要：
英文主题词nitrogen oxides; storage and reduction; acidic complex oxides; sulfur resistance
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期刊论文
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