(1. 昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室,昆明 650106;
2. 昆明贵研催化剂有限责任公司 云南省贵金属催化材料工程技术研究中心,昆明 650106)
摘 要: 储氧材料是汽车尾气净化三效催化剂的关键材料之一,决定了催化剂的性能及使用寿命。随着欧V排放法规的实施,对铈基储氧材料的性能提出了更严格的要求。CeO2是汽车尾气净化催化剂的一个重要组分,稀土、过渡金属、贵金属的掺杂都能在一定程度上提高CeO2的热稳定性、储氧能力和催化活性。综述了用于三效催化剂中的储氧材料铈基氧化物近年来的研究状况,阐述了Zr、La、Pr、Sn和Ti等非贵金属的掺杂、Pd、Ru、Pt等贵金属的掺杂对CeO2储氧性能的影响,总结了金属掺杂的CeZr基多元氧化物和CeZrAl的研究现状。
关键字: CeO2-ZrO2;非贵金属;贵金属;储氧能力
(1. State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,
Kunming Institute of Precious Metals, Kunming 650106, China;
2. Precious Metal Catalytic Materials Engineering Technology Research Center in Yunnan Province,
Kunming Sino-platinum Metals Catalysts Co., Ltd., Kunming 650106, China)
Abstract:Oxygen storage material is one of the key materials in automobile exhaust catalyst which determines the catalytic performance and life of three-way catalyst. With the implementation of Euro V emission regulations, more strict requirements are presented for the performance of ceria-based material. As an important component in the catalyst, its thermal stability, oxygen storage capacity and catalytic activity can be improved by doping of rare earth, transition metals and precious metals to some extent. The recent research status about ceria-based oxygen storage materials which used in three-way catalyst were reviewed, the effects of non-noble metal doping such as Zr, La, Pr, Sn, Ti, precious metals doping such as Pt, Pd, Ru on the properties of CeO2 oxygen storage capacity were expounded, and the current research situation about metal modification ternary CeZr-based composite oxides and CeZrAl were also introduced.
Key words: CeO2-ZrO2; non-noble metals; precious metals; oxygen storage capacity