Li Xiaochen, Gao Hongwei
Key Laboratory of Plant Resources and Chemistry in Arid Regions, Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences Urumqi 830011 China
RSC Adv. 2018 Mar 27;8(21):11778-11784. doi: 10.1039/c8ra00456k. eCollection 2018 Mar 21.
Lanthanum-based perovskite-type oxides represented by LaBO (B = Co, Fe, Mn) have been thought to present strong limitations for practical application although they are active for catalytic removal of NO. Cerium (Ce) substitution has been extensively studied to modify the properties of perovskites. It is noted that a new phase of ceria (CeO) can be separated from perovskites when the doping ratio exceeds the solution limit ( > S). This review outlines the relationship between the existence of CeO phase and catalytic activity. CeO dispersing on the lattice surface or small particles are beneficial for catalytic activity, but larger particles are adverse. Ce-doped LaBO perovskites exhibiting the best activity must contain additional CeO phases. In addition, CeO-supported LaBO perovskite catalysts are discussed.
以LaBO（B = Co、Fe、Mn）为代表的镧基钙钛矿型氧化物，尽管对催化去除NO具有活性，但被认为在实际应用中存在很大局限性。人们对铈（Ce）取代进行了广泛研究，以改变钙钛矿的性能。值得注意的是，当掺杂比超过固溶极限（> S）时，氧化铈（CeO）的新相可从钙钛矿中分离出来。本综述概述了CeO相的存在与催化活性之间的关系。分散在晶格表面或小颗粒中的CeO有利于催化活性，但较大颗粒则不利。表现出最佳活性的Ce掺杂LaBO钙钛矿必须含有额外的CeO相。此外，还讨论了CeO负载的LaBO钙钛矿催化剂。
