Photocatalytic degradation of volatile organic compounds (VOCs) with Pt-loaded TiO 2 was analyzed at elevated temperatures in the laboratory experiments (40-190 o C) and in the field experiments (30-230 o C). The temperature of catalyst coated on the sunlight receiver was easily elevated to around 200 o C by parabolic trough concentrator (1 mx1 m). When gaseous toluene (15 ppm) or acetaldehyde (400 ppm) was passed through the reactor, 79% of toluene or 93% of acetaldehyde was removed continuously. In the similar condition, bare TiO 2 was rapidly deactivated by the formation of byproducts. The combination of sunlight concentrator and Pt-TiO 2 catalyst exhibited the enhancement of complete degradation of VOCs, the inhibition of deactivation, and the reactivation of photocatalyst. The contributions of photocatalytic and catalytic activities of Pt-TiO 2 were analyzed by using UV lamp and electric heater. Acetaldehyde is thermocatalytically degraded by photodeposited Pt on TiO 2 at 70-190 o C without UV irradiation, however the UV irradiation is necessary for the complete oxidation of acetaldehyde into CO 2 . It is inferred that the degradation of VOCs is enhanced by the combined effect of Pt thermocatalyst and Pt-TiO 2 photocatalyst.