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• W2318368420 abstract "The interaction of acetaldehyde with TiO(2) nanorods has been studied under low pressures (acetaldehyde partial pressure range 10(-4)-10(-8) Torr) using chemical ionization mass spectrometry (CIMS). We quantitatively separate irreversible adsorption, reversible adsorption, and an uptake of acetaldehyde assigned to a thermally activated surface reaction. We find that, at room temperature and 1.2 Torr total pressure, 2.1 ± 0.4 molecules/nm(2) adsorb irreversibly, but this value exhibits a sharp decrease as the analyte partial pressure is lowered below 4 × 10(-4) Torr, regardless of exposure time. The number of reversible binding sites at saturation amounts to 0.09 ± 0.02 molecules/nm(2) with a free energy of adsorption of 43.8 ± 0.2 kJ/mol. We complement our measurements with FTIR spectroscopy and identify the thermal dark reaction as a combination of an aldol condensation and an oxidative adsorption that converts acetaldehyde to acetate or formate and CO, at a measured combined initial rate of 7 ± 1 × 10(-4) molecules/nm(2) s. By characterizing binding to different types of sites under dark conditions in the absence of oxygen and gas phase water, we set the stage to analyze site-specific photoefficiencies involved in the light-assisted mineralization of acetaldehyde to CO(2)." @default.
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• W2318368420 date "2011-11-23" @default.
• W2318368420 modified "2023-09-23" @default.
• W2318368420 title "Identification of Binding Sites for Acetaldehyde Adsorption on Titania Nanorod Surfaces Using CIMS" @default.
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• W2318368420 doi "https://doi.org/10.1021/la2025457" @default.
• W2318368420 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22040122" @default.
• W2318368420 hasPublicationYear "2011" @default.
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