Well‐dispersed spherical lanthanum oxycarbonate (La 2 O 2 CO 3 ) and La 2 O 3 particles with a flower‐like morphology were synthesized via a simultaneous polymerization–precipitate reaction, metamorphic reconstruction, and mineralization under a hydrothermal condition as well as subsequent calcination. The La 2 O 2 CO 3 and La 2 O 3 microspheres obtained consist of about 20 or 40 nm thick nanosheets as petals, respectively. They have an open three‐dimensional mesoporous and hollow structure and possess a high surface area, large pore volume, and marked thermal stability. These novel porous structural lanthanum‐based materials could be used as catalyst supports for many reactions.
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Sun et al. (2007) studied this question.
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