Photocatalytic decomposition of formic acid and methyl formate on TiO₂ doped with N and promoted with Au. Production of H₂

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• 作者：Andrea Gazsi ; Gá ; bor Schubert ; Pé ; ter Pusztai ; Frigyes Solymosi ; ^{fsolym@chem.u-szeged.hu}
• 关键词：Photolysis ; Formic acid ; Methyl formate ; Au/TiO2 catalyst ; Effect of N-doping
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：27 June, 2013
• 年：2013
• 卷：38
• 期：19
• 页码：7756-7766
• 全文大小：2186 K

文摘

The photo-induced vapor-phase decompositions of formic acid and methyl formate were investigated on pure, N-doped and Au-promoted TiO₂. Infrared (IR) spectroscopic studies revealed that illumination initiated the decomposition of adsorbed formate formed in the dissociation of formic acid and located mainly on TiO₂. The photocatalytic decompositions of formic acid and methyl formate vapor on pure TiO₂ occurred to only a limited extent. The deposition of Au on pure or doped TiO₂ markedly enhanced the extent of photocatalytic decomposition of formic acid. The main process was dehydrogenation to give H₂ and CO₂. The formation of CO occurred to only a very small extent. Addition of O₂ or H₂O to the formic acid decreased the CO level from ¡«0.8 % to ¡«0.088 % . Similar features were experienced in the photocatalytic decomposition of methyl formate, which dissociated in part to give surface formate. Experiments over Au deposited on N-doped TiO₂ revealed that the photo-induced decomposition of both compounds occurs even in visible light.