Open cell foam catalysts for CO 2 methanation: Presentation of coating procedures and in situ exothermicity reaction study by infrared thermography

Frey, Myriam; Romero, Thierry; Roger, Anne‐Cécile; Édouard, David

doi:10.1016/j.cattod.2016.03.016

Cited by 61 publications

(36 citation statements)

References 31 publications

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“…The procedure was repeated n times until the desired amount of washcoat was obtained. After optimization, the amount of Ce 2 Zr 2 0 8 to be deposited on the foam was fixed at 45 mg cm foam −3 . The samples were then impregnated in one step with 20 mg cm foam −3 of nickel (active phase) with a solution of nickel nitrate hexahydrate in ethanol .…”

Section: Methodsmentioning

confidence: 99%

“…After adjusting the coating procedure previously reported [26,27] to aluminum foams by defining an adequate pretreatment, the foams were dipped into as toichiometric CZ propionate precursor solution prepared according to the procedure presented previously and summarized in Figure 9. Excess precursor solution was removed and the foams were dried and calcined under air at 500 8Cf or 6h to crystallize the CZ mixed oxide.T he samples were placed in an ultrasound bath to remove poorly anchored washcoat.…”

Section: Ocf Coating Proceduresmentioning

confidence: 99%

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Aluminum Open Cell Foams as Efficient Supports for Carbon Dioxide Methanation Catalysts: Pilot‐Scale Reaction Results

et al. 2017

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To control the highly exothermal nature of carbon dioxide methanation (ΔRH=−165 kJ mol−1), a reactor capable of efficiently evacuating the heat generated is essential. A pilot‐scale (≈75 cm3) structured bed filled with an aluminum open cell foam (OCF) was chosen for the many advantages of this kind of reactor (high surface/volume ratio, low pressure drop, intensification of mass and heat transfer). A coating procedure for aluminum OCF was first developed. Different catalytic test conditions allowed a low temperature increase with a maximal value of 25 °C, as well as the influence of reaction temperature, pressure and flow rate on the axial temperature profile along the bed, to be shown. Finally, a comparison of the data collected herein for a powder fixed bed shows that the methane productivity obtained is similar to that obtained for the same catalyst in the powder form, but a much lower temperature increase due to the reaction and a lower pressure drop where clearly observed when using the aluminum OCF‐supported catalyst.

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Section: Methodsmentioning

confidence: 99%

Section: Ocf Coating Proceduresmentioning

confidence: 99%

Aluminum Open Cell Foams as Efficient Supports for Carbon Dioxide Methanation Catalysts: Pilot‐Scale Reaction Results

et al. 2017

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“…Metallic foams have been coated by the same procedures used to coat their honeycomb monoliths counterparts: (i) the deposition of catalyst slurries [7][8][9][10]; (ii) the deposition of catalyst supports followed by impregnation of the active phase [11][12][13]; and (iii) the in situ synthesis of the catalyst [14][15][16][17]. Washcoating may show some drawbacks such as the modification of the catalyst properties [9] or the pore blockage, indeed medium or large pore foams have been coated [18,19]. On the other hand, the synthesis and deposition of the catalytic species by hydrothermal treatment offers some advantages such as the absence of additives and binders, and the simpler and faster procedure [14,20,21].…”

Section: Introductionmentioning

confidence: 99%

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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“…In den letzten Jahren wurden hierzu einige Arbeiten veröffentlich, deren Augenmerk vor allem auf der Analyse der Temperaturverteilung in Festbetten aus katalytisch aktiven Formkörpern [27,28], Schäumen [29], Monolithen [30,31] oder auch bei überströmten Plattenkatalysatoren [32,33] Hierbei wird Infrarotstrahlung verwendet um die Temperatur im Reaktor messen zu können.…”

Section: Introductionunclassified

Entwicklung eines optisch zugänglichen Reaktors zur Thermographiemessung in einer Katalysatorschüttung

Schüler

Hinrichsen

2016

Chemie Ingenieur Technik

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Um die intrinsische Kinetik bei heterogen-katalysierten stark exothermen Gasphasenreaktionen messen zu können, sollten sowohl Stoff-als auch Wärmetransportlimitierungen vermieden werden. Auch eine Ungleichverteilung der Temperatur im Katalysatorbett, wie sie durch Hotspots verursacht wird, wirkt sich verfälschend auf diese Ergebnisse aus. Eine vielversprechende Technik zur kontaktlosen Temperaturmessung ist die Thermographie. Im Rahmen dieser Arbeit wurde diese Technik verwendet, um die Temperaturentwicklung und -verteilung während der stark exothermen CO 2 -Methanisierung in Abhängigkeit der Bett-und Feedgasverdünnung sowie der Katalysatorbelastung zu untersuchen.To measure the microkinetics in heterogeneously catalyzed strongly exothermic gas phase reaction heat and mass transfer limitations should be excluded. Also an unequal distribution of temperature in the catalyst fixed bed, like a hot spot, distorts the results of microkinetic investigations. A promising approach to measure the temperature contactless is thermography. For this work, an optically accessible reactor is developed to measure the temperature in a catalytically powder fixed bed. In the scope of this work, this technique is used to investigate the temperature development and distribution during the exothermal CO 2 methanation depending on the bed and gas dilution and the reactor performance.

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Open cell foam catalysts for CO 2 methanation: Presentation of coating procedures and in situ exothermicity reaction study by infrared thermography

Cited by 61 publications

References 31 publications

Aluminum Open Cell Foams as Efficient Supports for Carbon Dioxide Methanation Catalysts: Pilot‐Scale Reaction Results

Aluminum Open Cell Foams as Efficient Supports for Carbon Dioxide Methanation Catalysts: Pilot‐Scale Reaction Results

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

Entwicklung eines optisch zugänglichen Reaktors zur Thermographiemessung in einer Katalysatorschüttung

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