Synthesis of Mesoporous Ce_(1-x)SmxO2 Solid Solution Materials and its Catalytic Performancet

摘要

Novel mesoporous structural Ce_(1-x)SmxO2 solid solution materials have been synthesized via a facile approach of evaporation-induced self-assembly (EISA) in the presence of nitrate as inorganic species and triblock copolymers P_(123) as template. The detailed charaterization by power X-ray diffraction, transmission electron microscope, selected electron diffraction revealed the samples possessing fluorite-structure with the average grain size of 7 nm. Furthermore, N2 adsorption-desorption measurement illustrated the particular hierarchical porous textural Ce_(1-x)Sm_xO2 solid solution with the pores size in diameter between 2 to 4 nm and the maximun surface area of 106 m~2/g. The lemperature-programmed reduction of H2 (H2-TPR) result confirmed that the ceria-samarium solid solution owned more vacancies than pure CeO2, hence the double level pores textural Ce_(1-x)Sm_xO2 seem to be potential candidates for catalytic aspect.