熱分解に誘起される相分離を利用した多孔質セラミックス多面体粒子の作製

抄録

A new synthetic strategy to produce porous ceramic particles with well-defined polyhedral particle morphology and three-dimensionally interconnected mesoporous structure has been developed by means of the combination of topotactic conversion of polyhedral crystal precursors and pyrolysis-induced phase separation. The crystal morphology of precursors is controlled by the liquid-phase synthesis, while the mesoporous structure in each polyhedral particle is tailored by the selective removal of a phase-separated phase preserving the other phase. In this review, two examples of porous polyhedral metal oxides prepared from hydrogarnet precursors: mesoporous and mesocrystalline 12CaO • 7Al₂O₃ mayenite microcubes and porous SrFeO_3-δ perovskite polyhedral particles. The synthesis and characterization of these porous materials as well as their applications in catalysis are overviewed.