Internal mass transfer involves the diffusion of reactants within the catalyst pores. To improve internal mass transfer: 1. Increasing Pore Size: Larger pores can reduce diffusion limitations, allowing reactants to access active sites more easily. 2. Using Hierarchical Porous Structures: Catalysts with multiple levels of porosity can facilitate better diffusion within the catalyst. 3. Optimizing Catalyst Shape: Certain shapes, like hollow structures, can enhance internal mass transfer by providing shorter diffusion paths.
