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 -