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Sunlight-Powered Reverse Water Gas Shift Reaction Catalysed by Plasmonic Au/TiO2 Nanocatalysts: Effects of Au Particle Size on the Activity and 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).

SUBMITTER: Volders J 

PROVIDER: S-EPMC9738324 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature

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Sunlight-Powered Reverse Water Gas Shift Reaction Catalysed by Plasmonic Au/TiO<sub>2</sub> Nanocatalysts: Effects of Au Particle Size on the Activity and Selectivity.

Volders Jordi J   Elen Ken K   Raes Arno A   Ninakanti Rajeshreddy R   Kelchtermans An-Sofie AS   Sastre Francesc F   Hardy An A   Cool Pegie P   Verbruggen Sammy W SW   Buskens Pascal P   Van Bael Marlies K MK  

Nanomaterials (Basel, Switzerland) 20221123 23


This study reports the low temperature and low pressure conversion (up to 160 °C, <i>p</i> = 3.5 bar) of CO<sub>2</sub> and H<sub>2</sub> to CO using plasmonic Au/TiO<sub>2</sub> nanocatalysts and mildly concentrated artificial sunlight as the sole energy source (up to 13.9 kW·m<sup>-2</sup> = 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 c  ...[more]

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