To clarify the relationship between microscopic pore structure and coke distribution during the coke removal and regeneration process of porous catalytic particles, the lattice Boltzmann method coupled with the solid-phase renewal method is developed and the pore-scale model of carbon removal is established to investigate the dynamic evolution of pore structures owing to carbon removal behavior at the pore-scale. Meanwhile, the effects of pore size and coke removal rate on the coke removal reaction characteristics and mass transfer properties are evaluated. The results reveal that the coke removal reaction leads to the axial expanding pore structure and the contribution of viscous flow becomes more significant. The coke removal process weakens the gas rarefaction effect and reduces the mass transfer rate and reaction rate. The coke in the large pore and small pore is easier for the uniform elimination. In contrast, the entrance effect is more significant in the medium pore. Under the condition of high rarefaction effect and high reaction rate, the coke removal reaction impact on viscous flow is more significant in contrast to the Knudsen diffusion. The entrance effect also exists for complex random pore structure and coke removal enhances the uniformity of pore size distribution.