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Urea indirect electrooxidation by nickel(III) in alkaline medium: from kinetics and mechanisms to reactor modeling
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  • Guillaume Hopsort,
  • Laure Latapie,
  • Karine Groenen-Serrano,
  • Karine Loubiere,
  • Theo Tzedakis
Guillaume Hopsort
Laboratoire de GĂ©nie Chimique
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Laure Latapie
CNRS Delegation Occitanie Ouest
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Karine Groenen-Serrano
Paul Sabatier University Faculty of Science and Engineering
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Karine Loubiere
CNRS Delegation Occitanie Ouest
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Theo Tzedakis
Paul Sabatier University Faculty of Science and Engineering

Corresponding Author:theodore.tzedakis@univ-tlse3.fr

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Abstract

This paper presents an innovative approach to determine and model the kinetics of the catalytic oxidation of urea in alkaline medium on nickel(III) sites. Firstly, the kinetic law is established by considering two types of active sites, either from a chemically synthesized Ni-based powder or from a massive nickel electrode. Thus, the electrochemical regeneration kinetics of nickel(III) can be differentiated from the kinetics of the purely chemical pathway of NiOOH solid particles consumption by urea. Secondly, a mechanism for the urea indirect oxidation mediated by the nickel(III)/nickel(II) system is proposed to predict the formation of all the by-products, contained in the liquid phase that have been experimentally identified in our previous work. Finally, a model combining kinetic laws with diffusive and convective transport phenomena is constructed. The robustness and relevance of the latter are proven by comparing the experimental results obtained during laboratory-scale electrolyzes with those predicted by the model.
21 Dec 2022Submitted to AIChE Journal
22 Dec 2022Submission Checks Completed
22 Dec 2022Assigned to Editor
22 Dec 2022Review(s) Completed, Editorial Evaluation Pending
05 Jan 2023Reviewer(s) Assigned
12 Feb 2023Editorial Decision: Revise Major
09 Mar 20231st Revision Received
12 Mar 2023Submission Checks Completed
12 Mar 2023Assigned to Editor
12 Mar 2023Review(s) Completed, Editorial Evaluation Pending
14 Mar 2023Reviewer(s) Assigned