Details
| Original language | English |
|---|---|
| Article number | 939 |
| Number of pages | 12 |
| Journal | CATALYSTS |
| Volume | 12 |
| Issue number | 9 |
| Publication status | Published - 24 Aug 2022 |
Abstract
Hydrogen peroxide (H 2O 2) is an important chemical as it is an environmentally friendly oxidant for organic synthesis and environmental remediation as well as a promising candidate for the liquid fuel. Photocatalytic generation of H 2O 2 is sustainable, and many efforts have been put into the development of new catalysts to gain high H 2O 2 yields. In this investigation, Au/ZnO, Ag/ZnO and Au-Ag/ZnO catalysts were prepared by the simultaneous impregnation of HAuCl 4 and AgNO 3 and they were used to generate H 2O 2 from a methanol/O 2 system. It was demonstrated that Au/ZnO had the best performance at generating H 2O 2. The presence of Au on ZnO accelerated the generation of H 2O 2 on ZnO and facilitated H 2O 2 adsorption onto the catalyst surface, which resulted in the reaction kinetics changing from zero-order to first-order. Ag atoms on Ag/ZnO were unstable and would strip from the surface of ZnO during irradiation, decreasing the yield of H 2O 2. The stabilization of Ag on Au-Ag/ZnO depended on the ratio of Au and Ag. Au 0.1Ag 0.2/ZnO was a stable catalyst and it showed that the presence of Ag promoted the formation and decomposition of peroxide, simultaneously.
Keywords
- Au-Ag/ZnO, Au/ZnO, hydrogen peroxide, oxygen reduction, photocatalysis
ASJC Scopus subject areas
- Environmental Science(all)
- General Environmental Science
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: CATALYSTS, Vol. 12, No. 9, 939, 24.08.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Photocatalytic H2O2 Generation Using Au-Ag Bimetallic Alloy Nanoparticles loaded on ZnO
AU - Pang, Xinzhu
AU - Skillen, Nathan
AU - Bahnemann, Detlef W.
AU - Rooney, David W.
AU - Robertson, Peter K. J.
N1 - Funding Information: X.P. is grateful to acknowledge financial support from the China Scholarship Council (No. 201806030133) for funding her PhD research.
PY - 2022/8/24
Y1 - 2022/8/24
N2 - Hydrogen peroxide (H 2O 2) is an important chemical as it is an environmentally friendly oxidant for organic synthesis and environmental remediation as well as a promising candidate for the liquid fuel. Photocatalytic generation of H 2O 2 is sustainable, and many efforts have been put into the development of new catalysts to gain high H 2O 2 yields. In this investigation, Au/ZnO, Ag/ZnO and Au-Ag/ZnO catalysts were prepared by the simultaneous impregnation of HAuCl 4 and AgNO 3 and they were used to generate H 2O 2 from a methanol/O 2 system. It was demonstrated that Au/ZnO had the best performance at generating H 2O 2. The presence of Au on ZnO accelerated the generation of H 2O 2 on ZnO and facilitated H 2O 2 adsorption onto the catalyst surface, which resulted in the reaction kinetics changing from zero-order to first-order. Ag atoms on Ag/ZnO were unstable and would strip from the surface of ZnO during irradiation, decreasing the yield of H 2O 2. The stabilization of Ag on Au-Ag/ZnO depended on the ratio of Au and Ag. Au 0.1Ag 0.2/ZnO was a stable catalyst and it showed that the presence of Ag promoted the formation and decomposition of peroxide, simultaneously.
AB - Hydrogen peroxide (H 2O 2) is an important chemical as it is an environmentally friendly oxidant for organic synthesis and environmental remediation as well as a promising candidate for the liquid fuel. Photocatalytic generation of H 2O 2 is sustainable, and many efforts have been put into the development of new catalysts to gain high H 2O 2 yields. In this investigation, Au/ZnO, Ag/ZnO and Au-Ag/ZnO catalysts were prepared by the simultaneous impregnation of HAuCl 4 and AgNO 3 and they were used to generate H 2O 2 from a methanol/O 2 system. It was demonstrated that Au/ZnO had the best performance at generating H 2O 2. The presence of Au on ZnO accelerated the generation of H 2O 2 on ZnO and facilitated H 2O 2 adsorption onto the catalyst surface, which resulted in the reaction kinetics changing from zero-order to first-order. Ag atoms on Ag/ZnO were unstable and would strip from the surface of ZnO during irradiation, decreasing the yield of H 2O 2. The stabilization of Ag on Au-Ag/ZnO depended on the ratio of Au and Ag. Au 0.1Ag 0.2/ZnO was a stable catalyst and it showed that the presence of Ag promoted the formation and decomposition of peroxide, simultaneously.
KW - Au-Ag/ZnO
KW - Au/ZnO
KW - hydrogen peroxide
KW - oxygen reduction
KW - photocatalysis
UR - http://www.scopus.com/inward/record.url?scp=85138652207&partnerID=8YFLogxK
U2 - 10.3390/catal12090939
DO - 10.3390/catal12090939
M3 - Article
VL - 12
JO - CATALYSTS
JF - CATALYSTS
SN - 2073-4344
IS - 9
M1 - 939
ER -