Ruthenium catalyst on carbon nanofiber support layers for use in silicon-based structured microreactors, Part I: Preparation and characterization

Thakur, D.B.; Tiggelaar, Roald M.; Hoang, Thi Minh Chau; Gardeniers, Han; Lefferts, Leon; Seshan, Kulathuiyer

doi:10.1016/j.apcatb.2010.12.003

Cited by 21 publications

(28 citation statements)

References 53 publications

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“…Sample 2 was treated with nitric acid with a concentration of 69 wt % for 2 h and sample 1 was treated also with nitric acid for 2 h but with a lower concentration of 32.5 wt %. Thakur et al 28 carried out the treatment with 69 % nitric acid at 90 °C, but in this work the treatment was tested at room temperature (21 °C) according to safety issues to avoid acid fumes.…”

Section: Resultsmentioning

confidence: 99%

“…Pittmann et al 27 showed that after an oxidation time of 30 min the density of the functional groups does not grow further but only the specific surface area becomes larger. Thakur et al 28 carried out the oxidation at 90 °C. The acid treatment (oxidation) was performed at room temperature because of safety issues.…”

Section: Methodsmentioning

confidence: 99%

“…The average PZC for foam samples was before treatment 7.62 ± 0.2 and after treatment 4.66 ± 0.2. Thakur et al 28 reported for the pristine carbon nano fibers (CNFs) a pH value of 6.22 and for the pretreated CNFs with nitric acid a pH value of 4.87.…”

Section: Methodsmentioning

confidence: 99%

“…The catalytically active foam stirrers were mounted in a stirred tank (Parr Instrument autoclave 5100) with a volume of 600 mL. The foam catalysts were activated ex situ at 500 °C with hydrogen according to the procedure proposed by Thakur et al 28 in order to reduce almost all the ruthenium hydroxide and oxide. Two 30‐PPI foam catalysts (samples 3 and 6 from Tab.…”

Section: Methodsmentioning

confidence: 99%

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Preparation Method for Ruthenium Catalysts Supported by Carbon‐Coated Aluminum Foams

et al. 2015

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A preparation method is proposed for coating aluminum and aluminum alloy foams with a porous carbon layer for application as a catalyst support. The polymerization of furfuryl alcohol with diluted oxalic acid was used as precursor for the carbon layer. The polymer layer was distributed by applying centrifugal forces via spinning foam substrates during the polymerization process to prevent clogging and for homogeneous growth of the polymer layer. A homogeneous deposition precipitation method was applied for incorporation of ruthenium on carboncoated foam substrates. The carbon coating was characterized by X-ray tomography to measure the thickness distribution. The specific surface and pore volume distribution were determined by gas adsorption (BET) and mercury porosimetry. The prepared Ru/C foam catalysts were adopted as a stirrer in a rotating foam reactor for hydrogenation of glucose, a simple biomass model substance.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Preparation Method for Ruthenium Catalysts Supported by Carbon‐Coated Aluminum Foams

et al. 2015

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“…Pt-Co/CNTs [9], Ni-MgOPt/CNTs [10], Pt-Na/CNTs [11] and Ru-CNTs [12]), their use in microreactors for this process has not been reported, which can be probably attributed to the inherent difficulties in achieving a homogeneous and reproducible coating on the microchannels. The work of Thakur et al [13] is helpful to picture the complexities involved in the preparation of a carbon nanofiber layer as catalyst support in microreactors. These authors used Ru/CNFs on the channels of a silicon microreactor for the catalytic reduction of bromate contaminants in aqueous phase.…”

Section: Introductionmentioning

confidence: 99%

In-situ preparation of a highly accessible Pt/CNF catalytic layer on metallic microchannel reactors. Application to the SELOX reaction

Ramírez

Sebastián

Mallada

et al. 2015

Applied Catalysis A: General

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Please cite this article as: Adrián Ramírez, Víctor Sebastián, Reyes Mallada, Jesús Santamaría, Antonio Monzón, In-situ preparation of a highly accessible Pt/CNF catalytic layer on metallic microchannel reactors.Application to the SELOX reaction, Applied Catalysis A, General http://dx. Graphical abstractHighlights  CNFs were directly grown on the channels of a stainless steel microreactor.  CNFs were selectively grown on the channels and no outside them.  in situ method to prepare highly accessible Pt catalyst on a carbon nanofiber support.  Pt NP`s highly dispersed, homogeneous Pt distribution on the carbon nanofibers. ABSTRACTA general method to prepare a catalytic coating on the surface of stainless steel microreactors has been developed. The catalytic support consists of a layer of randomly oriented, highly accessible carbon nanofibers (CNFs), directly grown on the surface of the channels by chemical vapor deposition (CVD) of ethanol. These CNFs are functionalized to acquire a positive charge before a solution containing metallic nanoparticles (Pt) is flown through the channels. The nanoparticles adhere to the surface of the CNFs thanks to electrostatic interactions. This process is carried out in-situ and the method can be easily adapted to larger scale production. These catalystcoated microchannel reactors have been tested in the selective oxidation (SELOX) of CO in the 2 presence of H2. The results were compared to those obtained in a conventional fixed bed reactor packed with Pt/CNTs. The microreactor clearly outperformed the fixed bed reactor at the same space velocity (WSHV = 2220 l/h gPt),), achieving total CO conversion at temperatures 50 ºC lower.

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Properties and Use of Microreactors

Barrow¹,

Taylor²,

and³

et al. 2013

Microreactors in Organic Chemistry and Catalysis

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Ruthenium catalyst on carbon nanofiber support layers for use in silicon-based structured microreactors, Part I: Preparation and characterization

Cited by 21 publications

References 53 publications

Preparation Method for Ruthenium Catalysts Supported by Carbon‐Coated Aluminum Foams

Preparation Method for Ruthenium Catalysts Supported by Carbon‐Coated Aluminum Foams

In-situ preparation of a highly accessible Pt/CNF catalytic layer on metallic microchannel reactors. Application to the SELOX reaction

Properties and Use of Microreactors

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