Details
| Original language | English |
|---|---|
| Article number | 417 |
| Journal | CATALYSTS |
| Volume | 8 |
| Issue number | 10 |
| Early online date | 25 Sept 2018 |
| Publication status | Published - Oct 2018 |
Abstract
The effect of H 2O and O 2 on the adsorption and degradation of gaseous acetaldehyde on the anatase TiO 2 surface has been studied, in the dark and upon UV illumination, at ambient temperatures. The processes occurring at the surface have been elucidated by means of in situ ATR–FTIR (Attenuated Total Reflection—Fourier Transform Infrared) spectroscopy, while gas detectors allowed the analysis of the adducts and products in the gas phase. In the dark and under dry conditions acetaldehyde reacts independently of the atmosphere, upon aldol condensation to crotonaldehyde. However, under humid conditions, this reaction was prevented due to the replacement of the adsorbed acetaldehyde molecules, by water molecules. Upon UV illumination under oxygenic conditions, acetaldehyde was decomposed to acetate and formate. Under an N 2 atmosphere, the formation of acetate and formate was observed during the first hour of illumination, until all adsorbed oxygen had been consumed. In the absence of molecular oxygen acetate, methane, and CO 2 were detected, the formation of which most likely involved the participation of the bridging O atoms, within the TiO 2 lattice.
Keywords
- ATR-FTIR, Acetaldehyde, Adsorption, Anatase, Degradation, Oxygen, TiO
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: CATALYSTS, Vol. 8, No. 10, 417, 10.2018.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of H2O and O2 on the adsorption and degradation of acetaldehyde on anatase surfaces—An in situ ATR-FTIR study
AU - Melchers, Stephanie
AU - Schneider, Jenny
AU - Emeline, Alexei V.
AU - Bahnemann, Detlef W.
N1 - Funding information: This work was funded by the German Federal Ministry of Education and Research (contract No. 13N13350, PureBau—Untersuchung von Werkstoffsystemen für photokatalytisch hocheffiziente Baustoffe-Teilvorhaben: Oberflächenchemie der Photokatalysatoren und der Werkstoffe). A.V.E. and D.W.B. acknowledge the support by a Mega-grant of the Government of the Russian Federation within the Project “Establishment of the Laboratory ‘Photoactive Nanocomposite Materials’” No. 14Z50.31.0016. The publication of this article was funded by the Open Access fund of Leibniz Universität Hannover.
PY - 2018/10
Y1 - 2018/10
N2 - The effect of H 2O and O 2 on the adsorption and degradation of gaseous acetaldehyde on the anatase TiO 2 surface has been studied, in the dark and upon UV illumination, at ambient temperatures. The processes occurring at the surface have been elucidated by means of in situ ATR–FTIR (Attenuated Total Reflection—Fourier Transform Infrared) spectroscopy, while gas detectors allowed the analysis of the adducts and products in the gas phase. In the dark and under dry conditions acetaldehyde reacts independently of the atmosphere, upon aldol condensation to crotonaldehyde. However, under humid conditions, this reaction was prevented due to the replacement of the adsorbed acetaldehyde molecules, by water molecules. Upon UV illumination under oxygenic conditions, acetaldehyde was decomposed to acetate and formate. Under an N 2 atmosphere, the formation of acetate and formate was observed during the first hour of illumination, until all adsorbed oxygen had been consumed. In the absence of molecular oxygen acetate, methane, and CO 2 were detected, the formation of which most likely involved the participation of the bridging O atoms, within the TiO 2 lattice.
AB - The effect of H 2O and O 2 on the adsorption and degradation of gaseous acetaldehyde on the anatase TiO 2 surface has been studied, in the dark and upon UV illumination, at ambient temperatures. The processes occurring at the surface have been elucidated by means of in situ ATR–FTIR (Attenuated Total Reflection—Fourier Transform Infrared) spectroscopy, while gas detectors allowed the analysis of the adducts and products in the gas phase. In the dark and under dry conditions acetaldehyde reacts independently of the atmosphere, upon aldol condensation to crotonaldehyde. However, under humid conditions, this reaction was prevented due to the replacement of the adsorbed acetaldehyde molecules, by water molecules. Upon UV illumination under oxygenic conditions, acetaldehyde was decomposed to acetate and formate. Under an N 2 atmosphere, the formation of acetate and formate was observed during the first hour of illumination, until all adsorbed oxygen had been consumed. In the absence of molecular oxygen acetate, methane, and CO 2 were detected, the formation of which most likely involved the participation of the bridging O atoms, within the TiO 2 lattice.
KW - ATR-FTIR
KW - Acetaldehyde
KW - Adsorption
KW - Anatase
KW - Degradation
KW - Oxygen
KW - TiO
UR - http://www.scopus.com/inward/record.url?scp=85054128548&partnerID=8YFLogxK
U2 - 10.3390/catal8100417
DO - 10.3390/catal8100417
M3 - Article
VL - 8
JO - CATALYSTS
JF - CATALYSTS
SN - 2073-4344
IS - 10
M1 - 417
ER -