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Site Competition during Coadsorption of Acetone with Methanol and Water on TiO2(110)

“…As a result of acetone’s high vapor pressure and common usage, high concentrations of this chemical have been detected in many indoor and outdoor air environments . Heterogeneous photocatalytic oxidation using TiO 2 is becoming an attractive technology for the remediation of airborne acetone (and other organic) contaminants. − Chemical and photochemical studies of acetone on model TiO 2 surfaces have provided useful fundamental insights into the gas phase photooxidation of acetone on TiO 2 , − with the rutile TiO 2 (110) surface receiving much of this effort. Acetone binds strongly to the TiO 2 (110) surface at low coverages, but its binding energy decreases significantly with increasing coverage due to strong intermolecular repulsions.…”

Photocatalytic properties of mesoporous TiO2/ZrO2 films in gas-phase oxidation of alcohols

“…We know [2,8] that photocatalytic oxidation of ethanol can occur by two mechanisms: through a step of formation of the gaseous intermediate acetaldehyde, which is desorbed as an intermediate product mainly from the sites of weak ethanol adsorption [7], or via decomposition of the adsorbed substrate with formation of gaseous and adsorbed formate and acetate structures. The first route occurs with physical adsorption of ethanol molecules on the surface of the titanium dioxide, while the second route occurs with dissociative adsorption of ethanol.…”

“…The decrease in the concentration of the starting materials and also the accumulation of their oxidation products were detected chromatographically [2]. In order to determine the intermediate photooxidation products adsorbed on the surface of the TiO 2 and TiO 2 /ZrO 2 powders, we recorded the IR spectra under diffuse reflection conditions on a Thermo Nicolet NEXUS FT-IR spectrometer in the 4000-1000 cm -1 region.…”

“…We have shown that the zirconium content changes the acidity and specific surface area of the films, determining the rate at which the studied processes occur and the relative yield of reaction products.The high activity of titanium dioxide as a photocatalyst of redox conversions for a broad range of organic and inorganic substrates, coupled with its resistance to corrosion and low toxicity, is why there is interest in searching for and developing new methods for synthesis of materials based on TiO 2 having a certain phase composition and texture [1,2]. Development of template synthesis methods has made it possible to obtain powders and films of TiO 2 with an extended surface area and a porous structure [3,4], which is especially important for carrying out photocatalytic oxidation of volatile organic compounds, in particular ethylene [5], acetone [6], and ethanol [2,7,8], which are potential air pollutants at industrial sites.…”

“…Development of template synthesis methods has made it possible to obtain powders and films of TiO 2 with an extended surface area and a porous structure [3,4], which is especially important for carrying out photocatalytic oxidation of volatile organic compounds, in particular ethylene [5], acetone [6], and ethanol [2,7,8], which are potential air pollutants at industrial sites. An effective method for increasing the photocatalytic activity of titanium dioxide is also incorporation of transition metal and noble metal ions into a titanium dioxide matrix [9].…”