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Impact of reducing the channel diameter on heterogeneous gas reactions in an isothermal monolith

Abstract : The benefits and drawbacks of micro-monoliths with respect to conventional monoliths, for heterogeneous reactions in a gaseous phase, have been described experimentally in numerous studies. In this work, the interest of using a micro-monolith is demonstrated by achieving a preliminary analysis and by solving an isothermal model of the monolith. Ethanol steam reforming to produce hydrogen is considered as a case study to evaluate the performances of three different devices (having different channel diameters) used in an experimental study of Casanovas et al. [1]. To get a better understanding of the experimental results, simulations are performed in a new way, more suitable for a clearer comparison between the different devices. In kinetic regime, the better performance of a micro-monolith with respect to other devices is due to a higher catalyst amount per unit of reactor volume. The main interest of using a micro-monolith is a high compactness for a quite slow chemical reaction, while for a very fast one, the main interest is to avoid mass transfer limitations. Finally, a map representing the Damkholer number for a first order chemical reaction provides information to wisely choose the channel diameter of a monolith.
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Airy Tilland, Jean-François Portha, Laurent Falk, Caroline Tardivat. Impact of reducing the channel diameter on heterogeneous gas reactions in an isothermal monolith. Chemical Engineering and Processing: Process Intensification, Elsevier, 2015, 95, pp.317-326. ⟨10.1016/j.cep.2015.07.003⟩. ⟨hal-01266244⟩



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