Details
| Original language | English |
|---|---|
| Pages (from-to) | 4753-4758 |
| Number of pages | 6 |
| Journal | ACS catalysis |
| Volume | 7 |
| Issue number | 7 |
| Early online date | 19 Jun 2017 |
| Publication status | Published - 7 Jul 2017 |
Abstract
The simultaneous photocatalytic degradation of formaldehyde and hydrogen evolution on platinized TiO 2 have been investigated employing different H 2O/D 2O mixtures under oxygen-free conditions using quadrupole mass spectrometery (QMS) and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The main reaction products obtained from the photocatalytic oxidation of 20% formaldehyde were hydrogen and carbon dioxide. The ratio of evolved H 2 to CO 2 was to 2/1. The HD gas yield was found to be dependent on the solvent and was maximized in a H 2O/D 2O mixture (20%/80%). The study of the solvent isotope effect on the degradation of formaldehyde indicates that the mineralization rate of formaldehyde (CO 2) decreases considerably when the concentration of D 2O is increased. On the basis of the ATR-FTIR data, the formaldehyde in D 2O is gradually converted to deuterated formic acid during UV irradiation, which was confirmed by different band shifting. An additional FTIR band at 2050 cm -1 assigned to CO was detected and was found to increase during UV irradiation due to the adsorption of molecular CO on Pt/TiO 2. The results of these investigations showed that the molecular hydrogen is mainly produced by the reduction of two protons originating from water and formaldehyde. A detailed mechanism for the simultaneous hydrogen production and formaldehyde oxidation in D 2O is also presented. (Chemical Equation Presented).
Keywords
- D O, Pt/TiO, formaldehyde, hydrogen production, photocatalytic reaction
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- General Chemistry
Sustainable Development Goals
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In: ACS catalysis, Vol. 7, No. 7, 07.07.2017, p. 4753-4758.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Mechanisms of Simultaneous Hydrogen Production and Formaldehyde Oxidation in H2O and D2O over Platinized TiO2
AU - Belhadj, H.
AU - Hamid, S.
AU - Robertson, P.K.J.
AU - Bahnemann, D.W.
N1 - Publisher Copyright: © 2017 American Chemical Society. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/7/7
Y1 - 2017/7/7
N2 - The simultaneous photocatalytic degradation of formaldehyde and hydrogen evolution on platinized TiO 2 have been investigated employing different H 2O/D 2O mixtures under oxygen-free conditions using quadrupole mass spectrometery (QMS) and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The main reaction products obtained from the photocatalytic oxidation of 20% formaldehyde were hydrogen and carbon dioxide. The ratio of evolved H 2 to CO 2 was to 2/1. The HD gas yield was found to be dependent on the solvent and was maximized in a H 2O/D 2O mixture (20%/80%). The study of the solvent isotope effect on the degradation of formaldehyde indicates that the mineralization rate of formaldehyde (CO 2) decreases considerably when the concentration of D 2O is increased. On the basis of the ATR-FTIR data, the formaldehyde in D 2O is gradually converted to deuterated formic acid during UV irradiation, which was confirmed by different band shifting. An additional FTIR band at 2050 cm -1 assigned to CO was detected and was found to increase during UV irradiation due to the adsorption of molecular CO on Pt/TiO 2. The results of these investigations showed that the molecular hydrogen is mainly produced by the reduction of two protons originating from water and formaldehyde. A detailed mechanism for the simultaneous hydrogen production and formaldehyde oxidation in D 2O is also presented. (Chemical Equation Presented).
AB - The simultaneous photocatalytic degradation of formaldehyde and hydrogen evolution on platinized TiO 2 have been investigated employing different H 2O/D 2O mixtures under oxygen-free conditions using quadrupole mass spectrometery (QMS) and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The main reaction products obtained from the photocatalytic oxidation of 20% formaldehyde were hydrogen and carbon dioxide. The ratio of evolved H 2 to CO 2 was to 2/1. The HD gas yield was found to be dependent on the solvent and was maximized in a H 2O/D 2O mixture (20%/80%). The study of the solvent isotope effect on the degradation of formaldehyde indicates that the mineralization rate of formaldehyde (CO 2) decreases considerably when the concentration of D 2O is increased. On the basis of the ATR-FTIR data, the formaldehyde in D 2O is gradually converted to deuterated formic acid during UV irradiation, which was confirmed by different band shifting. An additional FTIR band at 2050 cm -1 assigned to CO was detected and was found to increase during UV irradiation due to the adsorption of molecular CO on Pt/TiO 2. The results of these investigations showed that the molecular hydrogen is mainly produced by the reduction of two protons originating from water and formaldehyde. A detailed mechanism for the simultaneous hydrogen production and formaldehyde oxidation in D 2O is also presented. (Chemical Equation Presented).
KW - D O
KW - Pt/TiO
KW - formaldehyde
KW - hydrogen production
KW - photocatalytic reaction
UR - http://www.scopus.com/inward/record.url?scp=85023768766&partnerID=8YFLogxK
U2 - 10.1021/acscatal.7b01312
DO - 10.1021/acscatal.7b01312
M3 - Article
VL - 7
SP - 4753
EP - 4758
JO - ACS catalysis
JF - ACS catalysis
SN - 2155-5435
IS - 7
ER -