Nanocrystalline La2Sn2O7 and La2Sn1.8Co0.2O7 with a phase-pure pyrochlore structure were synthesized by a hydrothermal\nmethod, and their catalytic activity was investigated for soot combustion. The as-synthesized catalysts presented relatively larger\nsurface area, and pore volume, which was benefit to the gas molecule diffusion in the reaction. A uniform spherical structure with\nparticle size of 200ââ?¬â??500 nm was found in SEM.The samples via hydrothermal route are more active for catalytic soot combustion,\nascribing to the spherical morphology, high surface area and improved oxygen mobility. After Co, the reducibility was improved\nand surface oxygen vacancy was produced, resulting in the enhanced activity and selectivity to CO2 formation.
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