In a previous study, we developed an integrated reaction system combining NH decomposition and CO methanation within a membrane reactor, significantly enhancing reactor performance through efficient H separation. Ru/Ba/γ-AlO and Ru/ZrO were employed as catalysts for each reaction. To ensure the accuracy and reliability of our results, they were validated through 1D models using FlexPDE Professional Version 7.21/W64 software. Key parameters such as reactor arrangement, catalyst bed positioning, overall heat transfer coefficient, rate constants, and H permeance were investigated to optimize system efficiency. The study revealed that positioning the NH decomposition on the shell side and CO methanation on the tube side resulted in a better performance. Additionally, shifting the methanation catalyst bed downward by approximately one-eighth (10 mm from 80 mm) achieves the highest CO conversion. A sensitivity analysis identified the rate constant of the NH decomposition catalyst and the H permeance of the membrane as the most influential factors in enhancing CO conversion. This highlights the priority of improving membrane H permeance and catalytic activity for NH decomposition to maximize system efficiency.