Four kinds of Bi2-xCexMo3O12 nanosheet catalysts are prepared by rapid microwave assisted hydrothermal method.The surface area of catalysts is successfully increased through adjusting the doped amount of cerium to change the morphology and structure of the synthesized catalysts.It is shown by the results that Bi2-xCexMo3O12 nanosheet catalyst prepared at a calcination temperature of 500℃,a pH of 3 and a doping amount of 0.05 exhibits the highest performance for selective oxidation of propylene,delivering a propylene conversion of 42.1%and an acrolein selectivity of 88.3%.The performance of the catalyst is negatively correlated with its crystallinity,because higher crystallinity will inhibit the flow of lattice oxygen between the lattices,thus inhibiting the selective oxidation and reducing the conversion rate of the reaction.The oxygen mobility of Bi2-xCexMo3O12 is characterized by XPS.The catalytic performance of Bi2-xCexMo3O12 is positively correlated with its oxygen fluidity.
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