Stable Rh particles in hydrotalcite-derived catalysts coated on FeCrAlloy foams by electrosynthesis

Benito, Patricia; Nuyts, Gert; Monti, Marco; Nolf, Wout De; Fornasari, Giuseppe; Janssens, Koen; Scavetta, Erika; Vaccari, Angelo

doi:10.1016/j.apcatb.2015.05.035

Cited by 23 publications

(19 citation statements)

References 62 publications

(126 reference statements)

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“…Although H 2 O and NO 3 – reduction increase the pH, the former produces H 2 bubbles that detach the coating and the pH generated is low . The quality of the electrodeposited catalysts is determined by the support, including electrical conductivity, roughness, and geometrical parameters (size and shape , ); the electrochemical setup, namely, electrical contact between the working electrode and the potentiostat and type of cell; and the type and concentration of metal precursors, pH of the electrolyte, applied potential, and synthesis time. ,− …”

Section: Catalyst Preparationmentioning

confidence: 99%

FeCrAl as a Catalyst Support

et al. 2020

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The iron-chromium-aluminum alloy (FeCrAl) is an exceptional support for highly exothermic and endothermic reactions that operate above 700 °C in chemically aggressive environments, where low heat and mass transfer rates limit reaction yield. FeCrAl two-and three-dimensional structured networksmonoliths, foams, and fibersmaximize mass transfer rates, while their remarkable thermal conductivity minimizes hot spots and thermal gradients. Another advantage of the open FeCrAl structure is the low pressure drop due to the high void fraction and regularity of the internal path. The surface Al 2 O 3 layer, formed after an initial thermal oxidation, supports a wide range of metal and metal oxide active phases. The aluminum oxide that adheres to the metal surface protects it from corrosive atmospheres and carbon (carburization), thus allowing FeCrAl to operate at a higher temperature. The top applications are industrial burners, in which compact knitted metal fibers distribute heat over large surface areas, and automotive tail gas converters. Future applications include producing H 2 and syngas from remote natural gas in modular units. This Review summarizes the specific preparation techniques, details process operating conditions and catalyst performance of several classes of reactions, and highlights positive and challenging aspects of FeCrAl.

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Section: Catalyst Preparationmentioning

confidence: 99%

FeCrAl as a Catalyst Support

et al. 2020

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“…The electro-base generation method is suitable to coat 60-80 ppi metallic foams with hydroxides such as hydrotalcite-type compounds to obtain structured catalysts after thermal treatment. 23,24 CeO2 can be also easily synthesized by this method, although most of the published works report the coating of simple shaped supports such as foils (Ni), sheets (stainless steel), and disks (Pt, Au, platinized silicon wafer, stainless steel). [25][26][27][28] Coatings with tailored morphology (flaky, 28,29 compact particles, 28 nanocubes and nanowires 30 ) and thickness (from nanostructured films 26,29 to 30 μm 27 ) can be obtained on steel, whose main applications are the suppression of corrosion processes and in fuel cells.…”

Section: Introductionmentioning

confidence: 99%

One-step electrodeposition of Pd–CeO₂on high pore density foams for environmental catalytic processes

Ambrosetti

Groppi

et al. 2018

Catal. Sci. Technol.

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“…The current density recorded during the synthesis, in the absence or presence of Rh in Mg/Al electrolyte solution, and properties of the coatings were quite similar [60]. Moreover, Rh 0 species were not identified by powerful µ-XANES (X-ray absorption near edge structure) measurements of the as-deposited coating [63]. Once adjusted the pH of the initial solution, applied potential and syntheses time were optimized to deposit Rh/Mg/Al = 11/70/19 a.r.% HT precursor, starting from a 0.03 M total metal concentration and 0.3 M KNO3 [58].…”

Section: Ph Of the Electrolyte Kno 3 Supporting Electrolyte And Syntmentioning

confidence: 96%

“…In the deep study performed for the preparation of structured catalysts by electrodeposition of HT compounds we realized that the coating of complex metallic foam structures with such HT catalyst precursors faced several issues to reach a target catalytic film that included not only the metal nitrate concentration. The quality of the coating was determined by: (i) the support, including nature (electrical conductivity and roughness [57]) and geometrical parameters (size and shape [58]); (ii) electrochemical set-up (electrical contact between the working electrode and the potentiostat [59] and type of cell [60]); (iii) electrochemical parameters (precursors, concentration and pH of the electrolyte, applied potential, and synthesis time [58,[61][62][63]); (iv) the interaction of coating with the metallic support [64]. The nature of the support and geometrical parameters are usually fixed by foam suppliers or given catalytic purposes, while the electrochemical set-up and parameters can be varied to control the coating properties.…”

Section: Effect Of Electrosynthesis Parameters In the Preparation Of mentioning

confidence: 99%

“…To reduce the metal particle size and the sintering, the Rh/Mg/Al a.r.% in the electrolytic solution was decreased from 11/70/19 to 5/70/25 and 2/70/28 (Figure 7) [63]. A change of Rh amount in the electrolytic solution did not alter the typical features of electrodeposited precursors and catalysts, but did determine the Rh dispersion.…”

Section: Rh Loading Electrolyte Concentration and Bimetallic Catalystsmentioning

confidence: 99%

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Hydrotalcite-Type Materials Electrodeposited on Open-Cell Metallic Foams as Structured Catalysts

Ho¹,

Scavetta²,

Tonelli³

et al. 2018

Inorganics

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Structured catalysts based on hydrotalcite-derived coatings on open-cell metallic foams combine tailored basic/acidic sites, relatively high specific surface area and/or metal dispersion of the coating as well as low pressure drop and enhanced heat and mass transfer of the 3D metallic support. The properties of the resulting structured catalysts depend on the coating procedure. We have proposed the electro-base generation method for in situ and fast precipitation of Ni/Al and Rh/Mg/Al hydrotalcite-type materials on FeCrAlloy foams, which after calcination at high temperature give rise to structured catalysts for syngas (CO + H 2 ) production through Steam Reforming and Catalytic Partial Oxidation of CH 4 . The fundamental understanding of the electrochemical-chemical reactions relevant for the electrodeposition and the influence of electrosynthesis parameters on the properties of the as-deposited coatings as well the resulting structured catalysts and, hence, on their catalytic performance, were summarized.Inorganics 2018, 6, 74 2 of 18 electrode, which is the substrate that must be coated. For the deposition of metallic particles, the applied potential and the bath solution must be chosen so that the direct electrochemical reduction of the metal precursors occurs. On the contrary, in the deposition of hydroxides or oxides the electro-base generation method is applied. The basic medium at the electrode-electrolyte interface provokes the chemical precipitation of the cations in the solution directly on the electrode surface. The reduction of some electroactive species, e.g., dissolved oxygen, water, and nitrate consumes H + or generates OH − , thus being responsible of the pH increase. The electrodeposition of hydroxides was originally developed for the modification of small and simple-shaped electrodes with Ni(OH) 2 [33,34] and it was later extended to the deposition of more complex hydrotalcite-type (HT) compounds, also called layered double hydroxides, with general formulaand Co/Al or Co/Cr HTs [36] were initially synthesized onto a Pt-foil cathode then Ni/Co, Ni/Fe, and Co/Fe formulations were applied as sensors [37], redox supercapacitors [38,39] and, more recently, as electrocatalysts, mainly for oxygen evolution reaction [40][41][42]. In these two latter fields, there is a growing interest in replacing conventional 2D by 3D supports such as fibers [43,44] and open-cell foams [45][46][47].In this context, we reported for the first time in 2008 the electro-base generation method to coat FeCrAlloy foams with HT compounds for the preparation of H 2 production structured catalysts [48]. Later, electrodeposition has been used to coat FeCrAlloy foams by Rh [49], Pt [50] and Pt-CeO 2 [51], as gas-phase structured catalysts. The integration of HT compounds on metallic open-cell foams results in structured catalysts that take advantage of both the above commented properties of open-cell foams and the intrinsic properties of HT materials, e.g., high specific surface area and/or metal dispersion, basicity, thermal stab...

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Stable Rh particles in hydrotalcite-derived catalysts coated on FeCrAlloy foams by electrosynthesis

Cited by 23 publications

References 62 publications

FeCrAl as a Catalyst Support

FeCrAl as a Catalyst Support

One-step electrodeposition of Pd–CeO₂on high pore density foams for environmental catalytic processes

Hydrotalcite-Type Materials Electrodeposited on Open-Cell Metallic Foams as Structured Catalysts

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Stable Rh particles in hydrotalcite-derived catalysts coated on FeCrAlloy foams by electrosynthesis

Cited by 23 publications

References 62 publications

FeCrAl as a Catalyst Support

FeCrAl as a Catalyst Support

One-step electrodeposition of Pd–CeO2on high pore density foams for environmental catalytic processes

Hydrotalcite-Type Materials Electrodeposited on Open-Cell Metallic Foams as Structured Catalysts

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One-step electrodeposition of Pd–CeO₂on high pore density foams for environmental catalytic processes