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Diffusion is the key in heterogeneous catalysis.In liquid-solid interfacial reactions, the diffusion of reaction species through surface to the active sites is as important as the active sites.Mesoporous catalysts, especially those with ordered mesopores are ideal for diffusion control.The size of the mesopore, the length of the mesopores, the opening of the mesopores can all be used to control the diffusion within the mesopores.In addition,the spatial location of the active within the mesopores can be controlled to suit the diffusion path of the multi-step reactions for optimal catalysis results.