Hydrogen purification for fuel cells through CO preferential oxidation using PtCu/Al2O3 structured catalysts

Gómez, Leticia Ester; Sollier, Brenda Maria del Valle; Lacoste, Albano M.; Miró, Eduardo Ernesto; Boix, Alicia Viviana

doi:10.1016/j.jece.2019.103376

Cited by 16 publications

(7 citation statements)

References 47 publications

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“…Landi et al [30] proposed that washcoated monoliths prevent the intra-particle mass transfer limitation (typically observed in powder samples), favoring CO oxidation during CO-PROX. Consequently, structured monoliths promote improvements in mass and heat transfer favoring an increase in activity, which match with previous reports [29,30,34,64]. Then, stability of structured catalysts (i.e., monoliths based on AuCu/Ce and AuCu/CeSi-75 catalysts) was evaluated in intermittent operation tests.…”

Section: Cfd Modelsupporting

confidence: 80%

Monoliths washcoated with AuCu catalysts for CO removal in an ethanol fuel processor: Effect of CeO2–SiO2 dual support on the catalytic performance and reactor cost

Cifuentes

Bustamante

et al. 2021

International Journal of Hydrogen Energy

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Section: Cfd Modelsupporting

confidence: 80%

Monoliths washcoated with AuCu catalysts for CO removal in an ethanol fuel processor: Effect of CeO2–SiO2 dual support on the catalytic performance and reactor cost

Cifuentes

Bustamante

et al. 2021

International Journal of Hydrogen Energy

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“…So far, various technologies have been developed for hydrogen purification. − CO preferential oxidation (COPrOx) in H 2 -rich gas is considered as one of the most efficient and straightforward methods for CO elimination. Apart from precious metals (e.g., Pt and Au) that are typically used as catalysts, non-noble metal oxides (e.g., Cu and Co oxides), pure or combined with other elements, have shown excellent activity of CO oxidation in the presence of H 2 . − Among them, cobalt oxide has attracted wide attention due to its high intrinsic activity toward CO oxidation. , …”

Section: Introductionmentioning

confidence: 99%

Improving the Catalytic Performance of Cobalt for CO Preferential Oxidation by Stabilizing the Active Phase through Vanadium Promotion

et al. 2021

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Preferential oxidation of CO (COPrOx) is a catalytic reaction targeting the removal of trace amounts of CO from hydrogen-rich gas mixtures. Non-noble metal catalysts, such as Cu and Co, can be equally active to Pt for the reaction; however, their commercialization is limited by their poor stability. We have recently shown that CoO is the most active state of cobalt for COPrOx, but under certain reaction conditions, it is readily oxidized to Co3O4 and deactivates. Here, we report a simple method to stabilize the Co 2+ state by vanadium addition. The V promoted cobalt catalyst exhibits considerably higher activity and stability than pure cobalt. The nature of the catalytic active sites during COPrOx was established by operando NAP-XPS and NEXAFS, while the stability of the Co 2+ state on the surface was verified by in situ NEXAFS at 1 bar pressure. The active phase consists of an ultra-thin cobalt-vanadate surface layer, containing tetrahedral V 5+ and octahedral Co 2+ cations, with an electronic and geometric structure that is deviating from the standard mixed bulk oxides. In addition, V addition helps to maintain the population of Co 2+ species involved in the reaction, inhibiting carbonate species formation that are responsible for the deactivation. The promoting effect of V is discussed in terms of enhancement of CoO redox stability on the surface induced by electronic and structural modifications. These results demonstrate that V-promoted cobalt is a promising COPrOx catalyst and validate the application of in situ spectroscopy to provide the concept for designing better performing catalysts.

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“…In our CFD simulations, a two-dimensional axisymmetric model has been developed to simulate the behavior of the enzymatic reaction in a single channel of cordierite monolith [ 30 ].…”

Section: Model Descriptionmentioning

confidence: 99%

CFD Simulations of Microreactors for the Hydrolysis of Cellobiose to Glucose by β-Glucosidase Enzyme

et al. 2020

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The enzymatic hydrolysis of lignocellulosic biomass-derived compounds represents a valid strategy to reduce the dependence on fossil fuels, with geopolitical and environmental benefits. In particular, β-glucosidase (BG) enzyme is the bottleneck in the degradation of cellulose because it catalyzes the hydrolysis of cellobiose, a known inhibitor of the other cellulolytic enzymes. However, free enzymes are unstable, expensive and difficult to recover. For this reason, the immobilization of BG on a suitable support is crucial to improve its catalytic performance. In this paper, computational fluid dynamics (CFD) simulations were performed to test the hydrolysis reaction in a monolith channel coated by BG adsorbed on a wrinkled silica nanoparticles (WSNs) washcoat. We initially defined the physical properties of the mixture, the parameters related to kinetics and mass transfers and the initial and boundary conditions thanks to our preliminary experimental tests. Numerical simulation results have shown great similarity with the experimental ones, demonstrating the validity of this model. Following this, it was possible to explore in real time the behavior of the system, varying other specified parameters (i.e., the mixture inlet velocity or the enzymatic load on the reactor surface) without carrying out other experimental analyses.

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Hydrogen purification for fuel cells through CO preferential oxidation using PtCu/Al2O3 structured catalysts

Cited by 16 publications

References 47 publications

Monoliths washcoated with AuCu catalysts for CO removal in an ethanol fuel processor: Effect of CeO2–SiO2 dual support on the catalytic performance and reactor cost

Monoliths washcoated with AuCu catalysts for CO removal in an ethanol fuel processor: Effect of CeO2–SiO2 dual support on the catalytic performance and reactor cost

Improving the Catalytic Performance of Cobalt for CO Preferential Oxidation by Stabilizing the Active Phase through Vanadium Promotion

CFD Simulations of Microreactors for the Hydrolysis of Cellobiose to Glucose by β-Glucosidase Enzyme

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