This study designed catalytic corrugated plates to enhance the hydrogen removal efficiency of a passive autocatalytic recombiner (PAR) facility using a nuclear power plant. After validating computational fluid dynamics (CFD) modeling and simulation with the experimental data of the reported REKO-3 facility using flat-type plates, the treated H2 mole fraction and catalytic plate efficiency of the REKO-3 facility was evaluated as a comparison reference. New corrugated plates, to improve the contact between the catalytic plate and gas, were designed by considering the angle and number of corrugated plates (90-Type A, 90-Type B, 120-Type A, and 120-Type B). Under identical boundary conditions, we evaluated the H₂mole fraction, pressure drop, velocity, and temperature. The 120-Type A corrugated plate significantly enhanced the overall performance. Examining the diverse catalytic plate shapes yielded a significant parametric correlation with the reduction in the effluent H2 mole fraction. This study emphasizes the importance of catalytic plate design and efficiency through a comparative analysis of results under the identical boundary conditions of the REKO-3 facility. Additionally, it provides insights into facility design and maintenance for H2 treatment in an emission gas.