Abstract
The activity and durability of phosphate-zirconia composite catalysts were examined in the decomposition of dichlorodifluoromethane (Freon 12). Combination of phosphate group with zirconia produced acid sites which were effective for decomposing Freon 12: 100% conversion of Freon 12 was attained at a temperature as low as 300 C on the phosphate-zirconia catalyst which had a superacid nature. The phosphate group also protected the surface of zirconia from poisoning by inorganic fluorides produced during the reaction. An addition of water helped maintain the activity of the catalyst by eliminating inorganic fluorides accumulated on its surface.
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