Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/39120
Title: | Sunlight-Powered Reverse Water Gas Shift Reaction Catalysed by Plasmonic Au/TiO2 Nanocatalysts: Effects of Au Particle Size on the Activity and Selectivity | Authors: | VOLDERS, Jordi ELEN, Ken Raes, Arno Ninakanti, Rajeshreddy KELCHTERMANS, An-Sofie Sastre, Francesc HARDY, An Cool, Pegie Verbruggen, Sammy W. BUSKENS, Pascal VAN BAEL, Marlies |
Issue Date: | 2022 | Publisher: | MDPI | Source: | Nanomaterials, 12 (23) (Art N° 4153) | Abstract: | This study reports the low temperature and low pressure conversion (up to 160 degrees C, p = 3.5 bar) of CO2 and H-2 to CO using plasmonic Au/TiO2 nanocatalysts and mildly concentrated artificial sunlight as the sole energy source (up to 13.9 kW center dot m(-2) = 13.9 suns). To distinguish between photothermal and non-thermal contributors, we investigated the impact of the Au nanoparticle size and light intensity on the activity and selectivity of the catalyst. A comparative study between P25 TiO2-supported Au nanocatalysts of a size of 6 nm and 16 nm displayed a 15 times higher activity for the smaller particles, which can only partially be attributed to the higher Au surface area. Other factors that may play a role are e.g., the electronic contact between Au and TiO2 and the ratio between plasmonic absorption and scattering. Both catalysts displayed >= 84% selectivity for CO (side product is CH4). Furthermore, we demonstrated that the catalytic activity of Au/TiO2 increases exponentially with increasing light intensity, which indicated the presence of a photothermal contributor. In dark, however, both Au/TiO2 catalysts solely produced CH4 at the same catalyst bed temperature (160 degrees C). We propose that the difference in selectivity is caused by the promotion of CO desorption through charge transfer of plasmon generated charges (as a non-thermal contributor). | Notes: | Buskens, P; Van Bael, MK (corresponding author), Hasselt Univ, Inst Mat Res, Design & Synth Inorgan Mat DESINe, Agoralaan Bldg, B-3590 Diepenbeek, Belgium.; Van Bael, MK (corresponding author), Imec Vzw, Imomec Associated Lab, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.; Van Bael, MK (corresponding author), EnergyVille, Thor Pk 8320, B-3600 Genk, Belgium.; Buskens, P (corresponding author), Netherlands Org Appl Sci Res TNO, High Tech Campus 25, NL-5656 AE Eindhoven, Netherlands. pascal.buskens@tno.nl; marlies.vanbael@uhasselt.be |
Keywords: | plasmonic;nanoparticle;gold;titania;catalysis;CCU;carbon dioxide;syngas;solar fuel | Document URI: | http://hdl.handle.net/1942/39120 | e-ISSN: | 2079-4991 | DOI: | 10.3390/nano12234153 | ISI #: | 000896093900001 | Rights: | © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2023 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Sunlight-Powered Reverse Water Gas Shift Reaction Catalysed by Plasmonic Au_TiO2 Nanocatalysts_ Effects of Au Particle Size on the Activity and Selectivity.pdf | Published version | 1.7 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.