Pt/CeO2–Al2O3 catalysts with and without Gd2O3 additive were prepared by stepwise incipient wetness impregnation (IWI) method. The catalysts were tested for autothermal reforming (ATR) of retail gasoline containing 158–500 ppm sulfur under the optimal reaction conditions: 800 8C, gasoline WHSV of 0.9 h 1 and aH2O/O2/Cmolar ratio of 5/0.35/1. It is foundthat the content ofGd2O3 and impregnationprocedure for catalyst preparation significantly affected the catalyst performance. Pt catalyst supported on the Al2O3 that was pre-impregnated with Ce and Gd nitrates orderly to 15 wt% CeO2 and 1.6 wt% Gd2O3 was the best catalyst forATRof gasoline with high reactivity and excellent stability. Within 1000-h ATRof retail asoline over this catalyst, gasoline conversion was slowly decreased to 95% after 300-h run and then remained at 95% throughout the test, while H2 fraction in reformate remained at 67% with a CH4 fraction less than 0.6%. It is revealed that modification of Al2O3 with CeO2 first and Gd2O3 then endowed the produced Pt catalyst withmany advantageous effects such as significantly improved and stabilized Pt-CeO2 interaction, greatly attenuated Pt-sintering, and enhanced oxygen ion conductivity of bulk CeO2.