Abstract :
Photocatalytic degradation of volatile organic compounds (VOCs) with Pt-loaded TiO2 was analyzed at elevated
temperatures in the laboratory experiments (40–190 C) and in the field experiments (30–230 C). The temperature of
catalyst coated on the sunlight receiver was easily elevated to around 200 C by parabolic trough concentrator (1 m· 1
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 TiO2 was rapidly deactivated by the formation
of byproducts. The combination of sunlight concentrator and Pt–TiO2 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–TiO2 were analyzed by using UV lamp and electric heater. Acetaldehyde
is thermocatalytically degraded by photodeposited Pt on TiO2 at 70–190 C without UV irradiation, however the UV
irradiation is necessary for the complete oxidation of acetaldehyde into CO2. It is inferred that the degradation of VOCs
is enhanced by the combined effect of Pt thermocatalyst and Pt–TiO2 photocatalyst.
2004 Elsevier Ltd. All rights reserved.
