在型腔周围均衡的配置冷却孔道。
介孔允许大分子进入孔道同时具有较小的扩散限制，微孔则作为小分子的吸附场所，使小分子能够很好的择型催化。
The mesoscale pores are benefit to the diffusion of larger molecules with low resistance, while the micro-scale pores can provide effective catalytic sites of small molecules with high selectivity.
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