Synthesis of highly thermally stable lanthanum-doped ordered mesoporous alumina

Highly thermally stable lanthanum-doped ordered mesoporous alumina has been prepared in a sol–gel system with salicylic acid and citric acid as interfacial protectors. When the molar ratio of alumina to lanthanum is 25.5, most La3+ ions in the resulting alumina structure showed tetracoordination. Moreover, the as-obtained sample exhibits a surface area of 305 m2 g−1 when calcined at 400 °C and can maintain an ordered mesostructure with a high surface area of 205 m2 g−1 even when treated at 1000 °C, demonstrating its high thermal stability.