Abstract: The Pt-Sn/γ-Al2O3 catalyst with different content of Fluorine was prepared, and the influence of F on the performance of reforming catalysts was investigated. The results of BET, Py-IR, NH3-TPD tests showed that the introduction of F has no significant effect on specific surface area and pore volume of catalyst. But the catalyst acidity is significantly improved. Both Lewis and Bronsted acid sites exist on the F-modified γ-Al2O3 carrier surface, and the acid amount increases with increasing F content. The reaction performance of n-heptane and naphtha showed that LPG yield increases significantly with the increase of fluorine content, the yield of C5+ and aromatics decrease, while coking rate on the catalyst increases. When the fluorine content is greater than 1%, the catalysts exhibit a high selectivity of LPG（C3+C4）.

Key words: Fluorine, Pt-Sn reforming catalyst, Liquefied petroleum gas