Sunlight-Powered Reverse Water Gas Shift Reaction Catalysed by Plasmonic Au/TiO 2 Nanocatalysts: Effects of Au Particle Size on the Activity and Selectivity.
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| Title: | Sunlight-Powered Reverse Water Gas Shift Reaction Catalysed by Plasmonic Au/TiO 2 Nanocatalysts: Effects of Au Particle Size on the Activity and Selectivity. |
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| Authors: | Volders, Jordi1,2,3 (AUTHOR), Elen, Ken1,2,3 (AUTHOR), Raes, Arno4,5 (AUTHOR), Ninakanti, Rajeshreddy4,5 (AUTHOR), Kelchtermans, An-Sofie1,2,3 (AUTHOR), Sastre, Francesc6 (AUTHOR), Hardy, An1,2,3 (AUTHOR), Cool, Pegie7 (AUTHOR), Verbruggen, Sammy W.4,5 (AUTHOR), Buskens, Pascal1,6 (AUTHOR) pascal.buskens@tno.nl, Van Bael, Marlies K.1,2,3 (AUTHOR) pascal.buskens@tno.nl |
| Source: | Nanomaterials (2079-4991). Dec2022, Vol. 12 Issue 23, p4153. 13p. |
| Subjects: | Water gas shift reactions, Nanoparticles, Gold nanoparticles, Gold clusters, Plasmonics, Titanium dioxide, Photothermal effect, Catalyst selectivity |
| Abstract: | This study reports the low temperature and low pressure conversion (up to 160 °C, p = 3.5 bar) of CO2 and H2 to CO using plasmonic Au/TiO2 nanocatalysts and mildly concentrated artificial sunlight as the sole energy source (up to 13.9 kW·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 °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). [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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