Gas-phase fluorination of 1,1,2,3-tetrachloropropene to 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) was investigated over the fluorinated Cr 2 O 3 catalysts with and without promoters. The reaction conditions showed significantly effects on product distribution including temperature, molar ratio of reactants and contact time. The selectivity to HCFO-1233xf was favored under relative higher temperature, larger HF/1,1,2,3-tetrachloropropene ratio and shorter contact time. Based on the data of product distribution over the fluorinated Cr 2 O 3 catalyst, a possible reaction path involving complicated consecutive steps was proposed including the addition/elimination and the direct Cl/F exchange. The XRD, XPS and Raman results indicated that introducing Mg, Ca and La onto Cr 2 O 3 promoted the formation of highly dispersed CrO x F y species during the pre-fluorination process, whereas the presence of Y inhibited the formation of CrO x F y . The BET results showed that the addition of La and Y into Cr 2 O 3 enhanced the surface area of fluorinated samples. The fluorinated Cr 2 O 3 promoted by La (La/F-Cr 2 O 3 ) catalyst displayed the best activity and lifetime among the prepared catalysts, which can be attributed to its rich CrO x F y species and high surface area.