Kinetic assessment of H2 production from NH3 decomposition over CoCeAlO catalyst in a microreactor: Experiments and CFD modelling

A flat-plate microreactor was designed, examined and modelled for the on-board hydrogen generation via the ammonia decomposition reaction over CoCeAlO mixed oxide catalyst. The tested catalyst was synthesised and immobilised using an inkjet printing-assisted self-assembly method. Inkjet printing tec...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-05, Vol.411, p.128595, Article 128595
Main Authors: Maleki, Hesam, Fulton, Matt, Bertola, Volfango
Format: Article
Language:English
Subjects:
Ammonia decomposition
CFD
Hydrogen production
Inkjet printing
Microreactor
Self-assembly
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Summary:A flat-plate microreactor was designed, examined and modelled for the on-board hydrogen generation via the ammonia decomposition reaction over CoCeAlO mixed oxide catalyst. The tested catalyst was synthesised and immobilised using an inkjet printing-assisted self-assembly method. Inkjet printing technology is proved to be an efficient way for the direct synthesis, deposition and rapid screening of heterogeneous catalysts. A series of kinetic experiments were performed to analyse the influence of reaction temperature and NH3 flow rate on the microreactor performance. Two kinetic rate expressions were developed based on the conversion data and implemented in the CFD model. The simulation results showed good accuracy with respect to the experimental data, and the kinetic models could effectively predict the reacting flow properties along the microchannel. The microreactor is especially designed to operate under the kinetic-control conditions with negligible mass transfer resistance. Furthermore, the proposed design eases the assemblage and disassemblage of the microreactor components, and the probing of fresh catalysts for kinetic studies. [Display omitted] •Kinetic experiments and CFD analysis are conducted on the NH3 decomposition within a microchannel.•The CoCeAlO catalyst layer is prepared using an inkjet printing-assisted self-assembly method.•Two rate expressions are developed to model the microreactor and predict the experimental data.•Mass transfer study is presented to assess the kinetics & species transport limits.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2021.128595