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向CeO2中引入Ln3+离子后形成的CeO2－LnO1.5（Ln=La，Nd，Sm，Gd）固溶体（n（Ce）：n（Ln）=1：1）是一种无贵金属的新型高效甲烷燃烧催化剂．比表面、XRD、Raman、TEM等分析证实，这类固溶体具有部分畸变的萤石结构，Ln3+进入晶格后诱发的结构变化使得团溶体的表面和本体能同时参与氧化还原反应．实验表明，该固态溶液体系是甲烷催化燃烧的良好催化剂．
CeO2-LnO1.5 (Ln = La, Nd, Sm, Gd) solid solution (n (Ce): n (Ln) = 1: 1) formed after the introduction of Ln3 + ions into CeO2 is a new kind of noble metal- Burning catalyst. The analysis of surface area, XRD, Raman and TEM shows that these solid solutions have partially deformed fluorite structure. The structural changes induced by Ln3 + entering the crystal lattice make the surface and bulk of the lumps dissolve in the redox reaction. Experiments show that the solid solution system is a good catalyst for catalytic combustion of methane.