Caswell, Thomas, Dlamini, Mbongiseni W., Miedziak, Peter J., Pattisson, Samuel, Davies, Philip R., Taylor, Stuart H. and Hutchings, Graham J.
2020.
Enhancement in the rate of nitrate degradation on Au- and Ag-decorated TiO2 photocatalysts.
Catalysis Science and Technology
10
(7)
, pp. 2083-2091.
10.1039/C9CY02473E
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Abstract
The solar-driven reduction of nitrate to nitrogen has been studied in the presence of a formate hole scavenger, over a series of Au- and Ag-decorated TiO2 catalysts. In this study, the catalyst preparation protocol was found to influence the nitrate transformation in the order: incipient wetness impregnation > stabilizer-free sol immobilization > sol immobilization. However, the sequence of performing specific treatment steps such as drying, calcination and sieving had a less pronounced effect. Low-conversion conditions were utilized to study the photo-degradation of nitrate over a range of monometallic and bimetallic catalysts with metal concentrations in the range M = 0–1 wt% (M: Au, Ag, Pd, AuAg). Our findings demonstrate that selectively degrading nitrate to N2 over these co-catalysts is non-trivial and is metal content dependent. For Au-doped TiO2 catalysts, the highest activity was measured over 0.2 wt% Au/TiO2 while a higher metal loading of 0.4 wt% was required for the Ag/TiO2 photocatalyst. Product selectivity was also demonstrated to be dependent on metal and metal loading: approximately 22% nitrite selectivity was determined over a 0.1 wt% Ag-doped catalysts, however this product was not detected when utilising Au-doped catalysts. Total selectivity to dinitrogen was shown to be possible on both Au and Ag doped catalysts, and again this was dependent on the concentration of the metal (Ag > 0.3 wt%; 0.2 < Au ≥ 0.4 wt%).
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Chemistry Cardiff Catalysis Institute (CCI) |
Publisher: | Royal Society of Chemistry |
ISSN: | 2044-4753 |
Funders: | EPSRC |
Date of First Compliant Deposit: | 13 March 2020 |
Date of Acceptance: | 3 March 2020 |
Last Modified: | 10 Feb 2021 02:20 |
URI: | http://orca.cf.ac.uk/id/eprint/130395 |
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