Structuring Pt/CeO2/Al2O3 WGS catalyst: Introduction of buffer layer

González‐Castaño, Miriam; Ivanova, Svetlana; Laguna, Óscar H.; T., L.M. Martínez; Odriozola, J.A.

doi:10.1016/j.apcatb.2016.07.039

Cited by 32 publications

(23 citation statements)

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“…As reported by several Authors [88][89][90][91], the thickness of the coated layer strongly affects both the heat and reactants diffusion through the catalyst pores. Indeed, the resistance to internal diffusion increased with increasing the coating thickness, leading to higher Anderson criterion values (heat transfer limitations), as well as higher Da-III and W-P numbers (mass transfer limitations) [31,38,69,79].…”

Section: Discussionmentioning

confidence: 82%

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

et al. 2018

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: The application of ceramic foams as structured catalyst supports is clearly expanding due to faster mass/heat transfer and higher contact efficiency than honeycomb monoliths and, mainly, packed beds. In this paper, alumina open-cell foams (OCFs) with different pore density (20, 30 and 40 ppi) were coated with Rh/CeO2 catalyst via a two steps synthesis method involving: (i) the solution combustion synthesis (SCS) to in-situ deposit the CeO2 carrier and (ii) the wet impregnation (WI) of the Rh active phase. The catalytic coatings were characterized in terms of morphology and adhesion properties by SEM/EDX analysis and ultrasounds test. Permeability and form coefficient were derived from pressure drop data. Catalytic performance was evaluated towards biogas Steam Reforming (SR) and Oxy-Steam Reforming (OSR) processes at atmospheric pressure by varying temperature (800–900 °C) and space velocity (35,000–140,000 NmL·g−1·h−1). Characteristics time analysis and dimensionless numbers were calculated to identify the controlling regime. Stability tests were performed for both SR and OSR over 200 h of time-on-stream (TOS) through consecutive start-up and shut-down cycles. As a result, homogenous, thin and high-resistance catalytic layers were in situ deposited on foam struts. All structured catalysts showed high activity, following the order 20 ppi < 30 ppi ≈ 40 ppi. External interphase (gas-solid) and external diffusion can be improved by reducing the pore diameter of the OCF structures. Anderson criterion revealed the absence of internal heat transfer resistances, as well as Damköhler and Weisz-Prater numbers excluded any internal mass transfer controlling regime, mainly due to thin coating thickness provided by the SCS method. Good stability was observed over 200 h of TOS for both SR and OSR processes.

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Section: Discussionmentioning

confidence: 82%

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

et al. 2018

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“…Three main processes involving water in catalytic processes may be considered: (i) a promotional role of molecular water including the solvation-like effect and water-mediated Htransfer, (ii) a promotional role of OH/OH − and H/H + species, and (iii) miscellaneous effects of water, such as water-assisted carbon removal, surface reconstruction, and active sites blocking [19]. Concretely, the rate limiting step in the water gas shift (WGS) reaction involves the activation of water species on the catalyst surface that may occur either at the active metal sites or at the support surface [20][21][22][23][24][25]. The adsorption and activation of water molecules is being a subject of intensive interest in order to clarify the role of metals and supports and the catalytic activity of the WGS catalysts.…”

Section: Introductionmentioning

confidence: 99%

A direct in situ observation of water-enhanced proton conductivity of Eu-doped ZrO2: Effect on WGS reaction

García-Moncada

Bobadilla

Poyato

et al. 2018

Applied Catalysis B: Environmental

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Eu-doped ZrO2 solid solutions have been synthesized in order to prepare proton conductors as water-enhancer additives for the WGS reaction. Elemental characterization has been carried out revealing homogeneous dopant distribution resulting in fluorite-type solid solutions for Eu2O3 contents up to ~9 mol.%. Representative samples of the Eu-doped ZrO2 series have been analysed by Impedance Spectroscopy (IS) in inert, oxygen and wet conditions. The solid solution with 5 mol.% of Eu2O3 has presented the highest conductivity values for all tested conditions indicating an optimal amount of dopant. Moreover, the presence of vapour pressure results in an increment of the conductivity at temperatures lower than 300 ºC, meanwhile at higher temperatures the conductivity is the same than that in inert

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“…The water gas shift reaction (WGS, CO + H 2 O ↔ CO 2 + H 2 ) is a well-known reaction implied, among others, in the hydrogen clean-up process for its subsequent use as feed for polymer electrolyte membrane fuel cells (PEMFCs) [1][2][3][4][5]. The advantages concerning the use of supported noble metals catalysts have motivated a deep study of these materials over the years, regarding both the employed metal phase and the support [4,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Pt/CePO₄catalysts for the WGS reaction: influence of the water-supplier role of the support on the catalytic performance

2018

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Structuring Pt/CeO2/Al2O3 WGS catalyst: Introduction of buffer layer

Cited by 32 publications

References 60 publications

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

A direct in situ observation of water-enhanced proton conductivity of Eu-doped ZrO2: Effect on WGS reaction

Pt/CePO₄catalysts for the WGS reaction: influence of the water-supplier role of the support on the catalytic performance

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Structuring Pt/CeO2/Al2O3 WGS catalyst: Introduction of buffer layer

Cited by 32 publications

References 60 publications

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

Rh/CeO2 Thin Catalytic Layer Deposition on Alumina Foams: Catalytic Performance and Controlling Regimes in Biogas Reforming Processes

A direct in situ observation of water-enhanced proton conductivity of Eu-doped ZrO2: Effect on WGS reaction

Pt/CePO4catalysts for the WGS reaction: influence of the water-supplier role of the support on the catalytic performance

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Pt/CePO₄catalysts for the WGS reaction: influence of the water-supplier role of the support on the catalytic performance