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The catalytic reaction is a heterogeneous process that involved gas and solid phases. To figure out the effects of changing the direction flow in alternating-Reverse Flow Reactor (RFR), the performance analysis on catalytic reaction rate must be considered the effect of interparticle diffusion. RFR is a fixed bed reactor where the direction flow was changed based time periodic. The dynamics flow caused the tortuosity behaves dynamically. It affected interparticle diffusion and eventually influenced the reaction rate. To interpret the influences of interparticle diffusion to reaction rate, it is approached by the effectiveness factors. The procedure was used to estimate the effectiveness factors by reaction rate simulation model, where the barrier of interparticle diffusion was considered in any point of reactor without numerical integration of diffusion equations in the pellet. The equation model was solved by software FlexPDE version 6, where arising of the direction flow was resolved by spatial measurements. The conversion of reaction from simulation method was compared by experimental data. The main parameter that contributed of simulation rate is effectiveness factor. The results indicated that the reverse flow operation in the fixed bed reactor produced the effectiveness factor that behaved dynamic. In particular, it can improve the performance of reactor if it is compared by steady-state conditions. The mathematical model that describes the dynamics of the oxidation of methane in RFR has been well validated