Catalytic oxidation is an effective strategy for eliminating CO pollutant. Pt/TiO

2

catalyst are one of the most active catalysts as used

but facing the issue of sulfur and water deactivation. In this study

TiO

2

was synthesized using a sol-gel method

while Pt/TiO

2

was prepared by impregnation method. By varying the calcination temperature of the TiO

2

support

Pt/TiO

2

catalysts with different proportions of anatase and rutile phases were synthesized. At the calcination temperature of 500 ℃

the catalysts exhibited approximately equal proportions of anatase and rutile

resulting in exceptional catalytic activity for CO oxidation

as well as improved resistance to sulfur and water in the flue gas. Consequently

the Pt/TiO

2

-500 catalyst achieved a CO conversion of 93% at 160 ℃. Even under conditions of 8% (vol) H

2

O and 0.016% (vol) SO

2

(GHSV = 300000 ml·h

-1

·g

-1

)

the CO conversion remained above 95% at 220 ℃ for 46 h. The catalysts were characterized and analyzed using various techniques. The results indicated that anatase-phase TiO

2

exhibited weak CO adsorption capacity but strong SO

2

adsorption capacity

whereas rutile-phase TiO

2

demonstrated strong CO adsorption capacity and weak SO

2

adsorption capacity. The presence of the anatase phase mitigated the CO self-poisoning pheno

menon of the catalyst

while the biphase interface reduced the adsorption and oxidation of SO

2

on the catalyst’s surface

significantly inhibiting the deposition of TiOSO

4

. Consequently

the Pt/TiO

2

-500 catalyst displayed the highest CO catalytic activity along with superior resistance to sulfur and water.