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Article

Plasma-Induced Catalyst Support Defects for the Photothermal Methanation of Carbon Dioxide

Particles and Catalysis Research Group, School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia
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Authors to whom correspondence should be addressed.
Academic Editor: Kai Yan
Materials 2021, 14(15), 4195; https://doi.org/10.3390/ma14154195
Received: 4 June 2021 / Revised: 16 July 2021 / Accepted: 20 July 2021 / Published: 28 July 2021
(This article belongs to the Special Issue Materials for Light-Assisted Catalytic Reactions)
The presence of defects in a catalyst support is known to benefit catalytic activity. In this work, a He-plasma treatment-based strategy for introducing and stabilising defects on a Ni/TiO2 catalyst for photothermal CO2 hydrogenation was established. The impact of pretreatment step sequence—which comprised He-plasma treatment and reduction/passivation—on defect generation and stabilisation within the support was evaluated. Characterisation of the Ni/TiO2 catalysts indicated that defects created in the TiO2 support during the initial plasma treatment stage were then stabilised by the reduction/passivation process, (P-R)Ni/TiO2. Conversely, performing reduction/passivation first, (R-P)Ni/TiO2, invoked a resistance to subsequent defect formation upon plasma treatment and consequently, poorer photothermal catalytic activity. The plasma treatment altered the metal-support interaction and ease of catalyst reduction. Under photothermal conditions, (P-R)Ni/TiO2 reached the highest methane production in 75 min, while (R-P)Ni/TiO2 required 165 min. Decoupling the impacts of light and heat indicated thermal dominance of the reaction with CO2 conversion observed from 200 °C onwards. Methane was the primary product with carbon monoxide detected at 350 °C (~2%) and 400 °C (~5%). Overall, the findings demonstrate the importance of pretreatment step sequence when utilising plasma treatment to generate active defect sites in a catalyst support. View Full-Text
Keywords: photothermal carbon dioxide methanation; plasma treatment; helium plasma; nickel catalyst; titania; defects photothermal carbon dioxide methanation; plasma treatment; helium plasma; nickel catalyst; titania; defects
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MDPI and ACS Style

Jantarang, S.; Ligori, S.; Horlyck, J.; Lovell, E.C.; Tan, T.H.; Xie, B.; Amal, R.; Scott, J. Plasma-Induced Catalyst Support Defects for the Photothermal Methanation of Carbon Dioxide. Materials 2021, 14, 4195. https://doi.org/10.3390/ma14154195

AMA Style

Jantarang S, Ligori S, Horlyck J, Lovell EC, Tan TH, Xie B, Amal R, Scott J. Plasma-Induced Catalyst Support Defects for the Photothermal Methanation of Carbon Dioxide. Materials. 2021; 14(15):4195. https://doi.org/10.3390/ma14154195

Chicago/Turabian Style

Jantarang, Salina, Simone Ligori, Jonathan Horlyck, Emma C. Lovell, Tze Hao Tan, Bingqiao Xie, Rose Amal, and Jason Scott. 2021. "Plasma-Induced Catalyst Support Defects for the Photothermal Methanation of Carbon Dioxide" Materials 14, no. 15: 4195. https://doi.org/10.3390/ma14154195

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