The surface electronic distribution and geometric construction of catalysts can be regulated by confined pore canals, which will affect the activity, selectivity and stability of catalysts. Combined with theoretical calculations and experimental methods, from the perspectives of thermodynamics, kinetics, geometric effect and electron transfer, this review illustrates the differences of the active components of catalysts and the characteristics of reaction molecules in different confined systems, and reveals the influence of confined pore canals on the diffusion, adsorption and reaction of reaction species. It aims to provide a reference for the microstructure design and performance control of catalysts.

Contents
1 Introduction
2 Pore confinement effects on diffusion
3 Pore confinement effects on adsorption
4 Pore confinement effects on catalytic reaction
5 Conclusion