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The catalysts can be recycled and reused in many gas\u2010 and solution\u2010phase reactions, and their high catalytic activity can be fully recovered by high\u2010temperature regeneration, should they be deactivated by feedstock poisoning. In addition to the large surface area provided by the graphene support, the enhanced catalytic performance is also attributed to the mesoporous SiO<jats:sub>2<\/jats:sub> layers, which not only stabilize the ultrafine metal nanoparticles, but also prevent the aggregation of the graphene nanosheets. 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