Thermochemical activation of CO2 into syngas over ceria-supported niobium oxide catalyst: An integrated experimental-DFT study

Kourosh Razmgar; Toyin Shittu; Ibukun Oluwoye; Abbas Khaleel; Gamini Senanayake; Mohammednoor Altarawneh

doi:10.1016/j.jcou.2022.102339

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Thermochemical activation of CO2 into syngas over ceria-supported niobium oxide catalyst: An integrated experimental-DFT study

Journal article

Open access

Peer reviewed

Thermochemical activation of CO2 into syngas over ceria-supported niobium oxide catalyst: An integrated experimental-DFT study

Kourosh Razmgar, Toyin Shittu, Ibukun Oluwoye, Abbas Khaleel, Gamini Senanayake and Mohammednoor Altarawneh

Journal of CO2 utilization, Vol.67, 102339

2023

DOI: https://doi.org/10.1016/j.jcou.2022.102339

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Abstract

Ceria

Cerium (IV) oxide

Niobium

Water splitting

Thermochemical splitting of a mixture of CO2 and water into syngas (and methane) remains a viable approach toward an industrial-scale treatment of CO2 emission. However, most deployed catalysts encompass expensive metallic ingredients such as Pd or Pt. In an integrated experimental-modelling approach, this work reports a high conversion of CO2 over alternative and cost-effective configurations. Ceria-based catalysts are proven to be effective in numerous catalytic processes owing to the facile switch in the Ce redox cycle. Evolution of H2 and CO from thermochemical splitting of water and carbon dioxide is an important process in the production of syngas and in fuel cell applications. In this study, NbOx ceria catalysts are prepared, characterized, and applied for production of syngas via the thermochemical splitting of CO2 and gaseous water. It was observed that presence of Nb in the ceria matrix up to 12 wt%, increases the reaction yield at higher temperature (up to 79% CO2 conversion with 80% selectivity to syngas at 600 ºC). Moreover, the catalytic reaction was found to display a higher selectivity towards syngas over the ceria supported catalysts. The attained conversion is higher than other ceria-supported catalysts such as Rh-CeO2, CeO2-ZrO2, and V2O5-CeO2. Mapped-out reaction pathways by DFT calculations portray accessible routes into syngas. Results provided herein should be useful to optimize a continuous process for the valorization of CO2 into syngas over relatively affordable a catalytic formulation.

Details

Title: Thermochemical activation of CO2 into syngas over ceria-supported niobium oxide catalyst: An integrated experimental-DFT study
Authors/Creators: Kourosh Razmgar (Author/Creator) - College of Science, Health, Engineering and Education, Murdoch University, Perth, WA 6150, Australia
Toyin Shittu (Author/Creator) - United Arab Emirates University
Ibukun Oluwoye (Author/Creator) - Murdoch University
Abbas Khaleel (Author/Creator) - United Arab Emirates University
Gamini Senanayake (Author/Creator) - Murdoch University
Mohammednoor Altarawneh (Author/Creator) - United Arab Emirates University
Publication Details: Journal of CO2 utilization, Vol.67, 102339
Publisher: Elsevier Ltd
Identifiers: 991005560354107891
Copyright: © 2022 The Author(s).
Murdoch Affiliation: Centre for Water, Energy and Waste
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.41 Catalysts; 2.41.546 Catalytic Hydrogenation
Web Of Science research areas: Chemistry, Multidisciplinary; Engineering, Chemical
ESI research areas: Chemistry