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Catalyst regeneration using CO 2 as reactant through reverse‐Boudouard reaction with coke

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  • Sérgio Castro Pereira
  • M. Filipa Ribeiro
  • Nuno Batalha
  • Marcelo Maciel Pereira

Abstract

The possibility of CO 2 recycling into standard refinery can largely mitigate greenhouse gas emissions. It was previously demonstrated that alumina modified by either potassium or lithium in the presence of vanadium was able to promote the reaction of CO 2 with coke in the presence of O 2 during the regeneration step of a spent catalyst. Herein, vanadium‐sodium and vanadium‐calcium on alumina were used to achieve that reaction. These catalysts showed slightly lower conversion compared to previously catalysts. However, regardless of the type of group I and II elements, all catalysts showed very similar apparent activation energy (Ea app ) for the coke oxidation with CO 2 reaction ( C O 2 + c o k e t o 2.6 p c → E a a p p C O + c o k e − O ), i.e., in the range of 188–193 kJ.mol-super-−1. In contrast without vanadium, Ea app was in the range of 242–253 kJ.mol-super-−1. Therefore, CO 2 is activated in a site composed of V‐O‐(group I or II) in the coke proximity. Moreover, these results clearly support that vanadium plays the main role in the type of activation complex, independently of the group I and II metal used and most probably in the dissociative step of CO 2 . © 2017 Society of Chemical Industry and John Wiley & Sons, Ltd.

Suggested Citation

  • Sérgio Castro Pereira & M. Filipa Ribeiro & Nuno Batalha & Marcelo Maciel Pereira, 2017. "Catalyst regeneration using CO 2 as reactant through reverse‐Boudouard reaction with coke," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 7(5), pages 843-851, October.
    • Handle: RePEc:wly:greenh:v:7:y:2017:i:5:p:843-851
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    File URL: http://hdl.handle.net/10.1002/ghg.1692
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    1. Lahijani, Pooya & Zainal, Zainal Alimuddin & Mohammadi, Maedeh & Mohamed, Abdul Rahman, 2015. "Conversion of the greenhouse gas CO2 to the fuel gas CO via the Boudouard reaction: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 41(C), pages 615-632.
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    1. Jalid, Fatima & Khan, Tuhin Suvra & Haider, M. Ali, 2021. "Exploring bimetallic alloy catalysts of Co, Pd and Cu for CO2 reduction combined with ethane dehydrogenation," Applied Energy, Elsevier, vol. 299(C).

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