PFC (perfluorocompounds), such as CF4, C2F6 and SF6 are strong global warming gases with 6500 to 23900 times higher global warming potential than CO2. To decompose PFC over a catalyst effectively, it is necessary to promote their adsorption on the catalyst surface. We focused on the amount of acid sites and added metal oxides to gamma-Al2O3 to increase the acid sites. We found that ZnO/gamma-Al2O3 can decompose CF4 by more than 99% at about 923 K. Analysis of the catalyst showed a good relationship between the amount of strong acidic sites, which could adsorb NH3 at up to 973 K, and the rate of CF4 decomposition.