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Article

Metal Micro-Monoliths for the Kinetic Study and the Intensification of the Water Gas Shift Reaction

1
Instituto de Ciencia de Materiales de Sevilla and Departamento de Química Inorgánica, Centro Mixto CSIC-Universidad de Sevilla, Av. Américo Vespucio 49, 41092 Sevilla, Spain
2
Laboratory of Catalysis and Catalytic Processes, Dipartimento di Energia, Politecnico di Milano, via La Masa 33, 20156 Milano, Italy
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(12), 594; https://doi.org/10.3390/catal8120594
Received: 12 November 2018 / Revised: 24 November 2018 / Accepted: 27 November 2018 / Published: 30 November 2018
(This article belongs to the Special Issue Structured Catalysts for Catalytic Processes Intensification)
A kinetic study of the water gas shift (WGS) reaction has been carried out on a Pt-based catalyst promoted by a Zr-based proton conductor. The investigation was first performed on powders with diluted feed mixtures and then extended to more severe and representative conditions by using a catalyst coated metallic micromonolith. Temperature measurements reveal that isothermal conditions were obtained along the micromonolith during the tested conditions. In addition, the very thin catalytic layer allows for the discarding of intraporous resistances, providing excellent conditions to analyse the kinetics of the WGS reaction under the integral regime. The proposed rate expression accounts for independence on CO concentration, an inhibiting effect of H2 and a promoting effect of H2O; kinetic orders on CO and H2 are in line with those reported in the literature for the Pt-based catalyst. Instead, the obtained reaction order of water (0.36) is significantly lower than that reported for unpromoted catalysts (typically 0.77–1.10) in good agreement with the proposed water-enhancer effect of the proton conductor on the rate-limiting step. Metallic micromonoliths turn out to be a powerful tool for the kinetic investigation, due to the absence of mass and heat transport limitations and represent a strategy for the intensification of the WGS unit for future applications of fuel processors in small mobile devices. View Full-Text
Keywords: WGS; proton conductor; micromonolith; kinetics; Pt-based catalyst; isothermal microreactor WGS; proton conductor; micromonolith; kinetics; Pt-based catalyst; isothermal microreactor
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MDPI and ACS Style

García-Moncada, N.; Groppi, G.; Beretta, A.; Romero-Sarria, F.; Odriozola, J.A. Metal Micro-Monoliths for the Kinetic Study and the Intensification of the Water Gas Shift Reaction. Catalysts 2018, 8, 594. https://doi.org/10.3390/catal8120594

AMA Style

García-Moncada N, Groppi G, Beretta A, Romero-Sarria F, Odriozola JA. Metal Micro-Monoliths for the Kinetic Study and the Intensification of the Water Gas Shift Reaction. Catalysts. 2018; 8(12):594. https://doi.org/10.3390/catal8120594

Chicago/Turabian Style

García-Moncada, Nuria; Groppi, Gianpiero; Beretta, Alessandra; Romero-Sarria, Francisca; Odriozola, José A. 2018. "Metal Micro-Monoliths for the Kinetic Study and the Intensification of the Water Gas Shift Reaction" Catalysts 8, no. 12: 594. https://doi.org/10.3390/catal8120594

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