采用共沉淀法制备了不同NiO负载量的NiO/A12O3催化剂,并用于NOx储存还原技术去除NOx反应中.结果表明,当Ni/Al摩尔比为0.3时,NiO/A12O3样品的NOx吸附量最大;随着Ni含量的增加,NiAl2O4晶相减少.沉淀物在高温煅烧前利用低温等离子体处理后,所得催化剂吸附NOx的能力明显增强,当Ni/Al摩尔比为0.3的催化剂,NOx吸附量由未处理时的345μmol/g增至经处理后的477μmol/g.研究发现,经低温等离子体处理后,催化剂上粒子更加分散,比表面积增大.另外,利用原位红外光谱分析了催化剂吸附NOx的机理.结果表明,吸附的NO首先在催化剂表面以桥式亚硝酸盐形式存在,然后转变成不同形式的硝酸盐.
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