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A series of Co3O4 catalysts were prepared by a facile precipitation method just changing the aging time and tested for methane combustion. It was found that the activity for the reaction increased firstly and then decreased with increasing aging time in the form of a volcano curve. The Co3O4 aged for 8h (Co3O4-8) exhibited the best catalytic performance with the specific reaction rate (Rs) of 25.91nmols...
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