Blaszkowski et al. reported activation energy barrier of 29.9 kcal mol -1 for the hydrogen exchange between methane and H-ZSM-5 based on computations. Schoofs et al. reported the activation energy barrier for H/D exchange between methane and deuterated ZSM-5 in the range of 30.8-35.4 kcal mol -1 for different Si/Al ratio using mass spectrometric data and the experiments were performed at 723-823 K. Gabrienko et al. found that the barrier for H/D exchange between deuterated methane and (Cu, and Ag)/H-ZSM-5 using solid state NMR is 29.0 kcal mol -1 , when reactions were carried out at 553-563 K. Tuma et al. reported 37.2 kcal mol -1 free energy barrier computed at 298 K using MP2:DFT calculation for proton exchange between methane and H-ZSM-5. Osuga et al. reported an activation energy barrier of 24.8 kcal mol -1 for H/D exchange between methane and deuterated ZSM-5