Browsing by Author "21876533 - Chiuta, Steven"
Now showing items 1-13 of 13
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Design and operation of an ammonia-fueled microchannel reactor for autothermal hydrogen production
Chiuta, Steven; Bessarabov, Dmitri G. (Elsevier, 2018)The present work describes the design and operation of an autothermal microchannel reactor for portable and distributed hydrogen production via ammonia decomposition. The microreactor consists of an array of alternating ... -
Experimental performance evaluation of an ammonia-fuelled microchannel reformer for hydrogen generation
Chiuta, Steven; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bessarabov, Dmitri G. (Elsevier, 2014)Microchannel reactors appear attractive as integral parts of fuel processors to generate hydrogen (H2) for portable and distributed fuel cell applications. The work described in this paper evaluates, characterizes, and ... -
Experimentation and CFD modelling of a microchannel reactor for carbon dioxide methanation
Engelbrecht, Nicolaas; Chiuta, Steven; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bessarabov, Dmitri G. (Elsevier, 2017)The methanation of carbon dioxide (CO2) via the Sabatier process is increasingly gaining interest for power-to-gas application. In this investigation, a microchannel reactor was evaluated for CO2 methanation at different ... -
A highly efficient autothermal microchannel reactor for ammonia decomposition: analysis of hydrogen production in transient and steady-state regimes
Engelbrecht, Nicolaas; Chiuta, Steven; Bessarabov, Dmitri G. (Elsevier, 2018)The experimental evaluation of an autothermal microchannel reactor for H2 production from NH3 decomposition is described. The reactor design incorporates an autothermal approach, with added NH3 oxidation, for coupled heat ... -
Hydrogen production from ammonia decomposition over a commercial Ru/Al2O3 catalyst in a microchannel reactor: experimental validation and CFD simulation
Chiuta, Steven; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bessarabov, Dmitri G. (Elsevier, 2016)In this work, an integrated experimental and CFD modelling technique was used to evaluate a microchannel reactor producing hydrogen from ammonia decomposition using a commercial Ru/Al2O3 catalyst. The microchannel reactor ... -
HySA infrastructure center of competence: a strategic collaboration platform for renewable hydrogen production and storage for fuel cell telecom applications
Bessarabov, Dmitri; Human, Gerhard; Chiuta, Steven; Van Niekerk, Frik; De Beer, Deon; Malan, Hannes; Grobler, L.J. (IEEE, 2014)The Department of Science and Technology of South Africa developed the National Hydrogen and Fuel Cells Technologies (HFCT) Research, Development and Innovation Strategy. The National Strategy was branded Hydrogen South ... -
A modelling evaluation of an ammonia-fuelled microchannel reformer for hydrogen generation
Chiuta, Steven; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bessarabov, Dmitri G.; Le Grange, Louis A. (Elsevier, 2014)Hydrogen production from an ammonia-fuelled microchannel reactor is simulated in a three-dimensional (3D) model implemented via Comsol Multiphysics™. The work described in this paper endeavours to obtain a mathematical ... -
Performance evaluation of a high-throughput microchannel reactor for ammonia decomposition over a commercial Ru-based catalyst
Chiuta, Steven; Everson, Raymond C.; Neomagus, Hein W.J.P.; Bessarabov, Dmitri G. (Elsevier, 2015)In this work, the prospect of producing hydrogen (H2) via ammonia (NH3) decomposition was evaluated in an experimental stand-alone microchannel reactor wash-coated with a commercial Ruthenium-based catalyst. The reactor ... -
A performance evaluation of a microchannel reactor for the production of hydrogen from formic acid for electrochemical energy applications
Ndlovu, Isabella M.; Everson, Raymond C.; Chiuta, Steven; Neomagus, Hein W.J.P.; Engelbrecht, Nicolaas; Bessarabov, Dmitri G. (ESG, 2018)An experimen tal evaluation of a microchannel reactor was completed to assess the reactor performance for the catalytic decomposition of vaporised formic acid (FA) for H2 production. Initially, X-ray ... -
Reactor technology options for distributed hydrogen generation via ammonia decomposition: a review
Chiuta, Steven; Everson, Raymond C.; Neomagus, Hein W.J.P.; Van der Gryp, Percy; Bessarabov, Dmitri G. (Elsevier, 2013)Hydrogen (H2) fuel obtained via thermo-catalytic ammonia (NH3) decomposition is rapidly attracting considerable interest for portable and distributed power generation systems. Consequently, a variety of reactor technologies ... -
South African hydrogen infrastructure (HySA infrastructure) for fuel cells and energy storage: overview of a projects portfolio
Bessarabov, Dmitri; Human, Gerhardus; Kruger, Andries J.; Chiuta, Steven; Modisha, Phillimon M.; Du Preez, Stephanus P.; Oelofse, Stephanus P.; Vincent, Immanuel; Van der Merwe, Jan (Elsevier, 2017)The paper provides brief introduction to the National South African Program, branded HySA (Hydrogen South Africa) as well as discusses potential business cases for deployment of hydrogen and fuel cell technology in South ... -
Techn-economic assessment of power-to-methane and power-to-syngas business models for sustainable carbon dioxide utilization in coal-to-liquid facilities
Chiuta, Steven; Engelbrecht, Nicolaas; Human, Gerhard; Bessarabov, Dmitri G. (Elsevier Sci Ltd, 2016)The work reported in this paper aimed to evaluate and assess the technical and economic prospects of implementing a renewable-energy-based technology namely power-to-gas (PtG) for sustainable utilization of CO2 emissions ... -
Techno-economic evaluation of a nuclear-assisted coal-to-liquid facility
Chiuta, Steven; Blom, Ennis (Elsevier, 2012)The production of synthetic fuels (synfuels) in Coal-to-Liquid (CTL) facilities has contributed to global warming due to the enormous carbon dioxide (CO2) emission footprint of the process. This corresponds to inefficient ...