Details
| Original language | English |
|---|---|
| Pages (from-to) | 25-37 |
| Number of pages | 13 |
| Journal | ACS catalysis |
| Volume | 9 |
| Issue number | 1 |
| Early online date | 19 Nov 2018 |
| Publication status | Published - 4 Jan 2019 |
Abstract
This study focuses on understanding the mechanisms for optimization of the photocatalytic hydrogen peroxide production over TiO 2 (Aeroxide P25). Via precise control of the reaction parameters (pH, temperature, catalyst amount, oxygen content, sacrificial electron donor, and light intensity), it is possible to tune either the apparent quantum yield or the production rate. As a result of the optimization, apparent quantum yields of up to 19.8% and production rates of up to 83 μM min -1 were obtained. We also observed a light-dependent change of the reaction order and an interdependency of the light intensity and catalyst amount, and we developed a well-fitting kinetic model for it, which might also be applied to other reactions. Furthermore, a previously unreported inactivation of the photocatalyst in the case of water oxidation is described.
Keywords
- catalyst inactivation, hydrogen peroxide (H O ), light intensity, oxygen reduction, photocatalysis, titanium dioxide (TiO )
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
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In: ACS catalysis, Vol. 9, No. 1, 04.01.2019, p. 25-37.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Modeling and Optimization of the Photocatalytic Reduction of Molecular Oxygen to Hydrogen Peroxide over Titanium Dioxide
AU - Burek, Bastien O.
AU - Bahnemann, Detlef
AU - Bloh, Jonathan Z.
N1 - Funding information: The authors gratefully thank German Research Foundation (DFG) for funding in the grant no. BL 1425/1-1. Furthermore, we thank Dr. Dirk Holtmann, DECHEMA-Forschungsinstitut, for helpful discussions and advice and Heinrich Kopietz, Jano Bender, and Yvonne Hohmann, DECHEMA-Forschungsin-stitut machine work shop, for help with technical drawings and building of the setups.
PY - 2019/1/4
Y1 - 2019/1/4
N2 - This study focuses on understanding the mechanisms for optimization of the photocatalytic hydrogen peroxide production over TiO 2 (Aeroxide P25). Via precise control of the reaction parameters (pH, temperature, catalyst amount, oxygen content, sacrificial electron donor, and light intensity), it is possible to tune either the apparent quantum yield or the production rate. As a result of the optimization, apparent quantum yields of up to 19.8% and production rates of up to 83 μM min -1 were obtained. We also observed a light-dependent change of the reaction order and an interdependency of the light intensity and catalyst amount, and we developed a well-fitting kinetic model for it, which might also be applied to other reactions. Furthermore, a previously unreported inactivation of the photocatalyst in the case of water oxidation is described.
AB - This study focuses on understanding the mechanisms for optimization of the photocatalytic hydrogen peroxide production over TiO 2 (Aeroxide P25). Via precise control of the reaction parameters (pH, temperature, catalyst amount, oxygen content, sacrificial electron donor, and light intensity), it is possible to tune either the apparent quantum yield or the production rate. As a result of the optimization, apparent quantum yields of up to 19.8% and production rates of up to 83 μM min -1 were obtained. We also observed a light-dependent change of the reaction order and an interdependency of the light intensity and catalyst amount, and we developed a well-fitting kinetic model for it, which might also be applied to other reactions. Furthermore, a previously unreported inactivation of the photocatalyst in the case of water oxidation is described.
KW - catalyst inactivation
KW - hydrogen peroxide (H O )
KW - light intensity
KW - oxygen reduction
KW - photocatalysis
KW - titanium dioxide (TiO )
UR - http://www.scopus.com/inward/record.url?scp=85059234180&partnerID=8YFLogxK
U2 - 10.1021/acscatal.8b03638
DO - 10.1021/acscatal.8b03638
M3 - Article
VL - 9
SP - 25
EP - 37
JO - ACS catalysis
JF - ACS catalysis
SN - 2155-5435
IS - 1
ER -