Synthesis of nanostructured Pt/oxide catalyst particles by MOCVD process at ambient pressure

Faust, Matthias; Enders, Mirja; Bruns, Michael; Bräse, Stefan; Gao, Kun; Seipenbusch, Martin

doi:10.1016/j.surfcoat.2013.06.088

Cited by 17 publications

(16 citation statements)

References 20 publications

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“…Trimethyl(methylcyclopentadienyl)platinum(IV), commonly referred to as MeCpPtMe 3 (Abcr) is widely used ( [8,9,[13][14][15]), relatively volatile ( [16]), and rather expensive. The iron precursor Ethylferrocene (EF) (Abcr) is relatively affordable and volatile [17].…”

Section: Cvd Precursorsmentioning

confidence: 99%

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On the Activity Enhancing Role of Iron Oxide for Noble Metal Oxidation Catalysts: A CVD-Based Study with Differently Structured Combinations of Pt and FeOx Coatings on Al2O3

et al. 2018

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Abstract:With regard to the catalysis of oxidation reactions by noble metals, the addition of FeO x to an Al 2 O 3 -supported Pt catalyst is known to be energetically more favorable compared to only Pt. In this work, different process routes for the preparation of such Fe-promoted Pt/Al 2 O 3 catalysts via atmospheric chemical vapor deposition (CVD) in a fluidized bed were explored. Specifically, the question of whether it would be advantageous to deposit the Fe before, along with, or after the Pt was addressed, and new information was obtained about the optimum FeO x -Pt interface and mixing ratio. Vapors of Trimethyl(methylcyclopentadienyl)platinum(IV) and/or Ethyl-ferrocene were injected into the bed from the top, permitting a quasi-lossless precursor operation and a very good control of the deposited metal, and hence of the catalyst structure. Samples could be extracted from the top while CVD was ongoing to obtain time-resolved data. The catalytic activity was determined through CO oxidation. The Fe-Pt mixing ratio was then varied for the most active deposition sequence, in order to identify an activity optimum generated by the minimum amount of Pt catalyst. When compared to pure Pt/Al 2 O 3 , the optimum catalyst consistently showed superior performance even after thermal stress.

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Section: Cvd Precursorsmentioning

confidence: 99%

“…this regard, CVD offers significant potential, due to its excellent reproducibility and control over the structure of the active phase(s) [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

On the Activity Enhancing Role of Iron Oxide for Noble Metal Oxidation Catalysts: A CVD-Based Study with Differently Structured Combinations of Pt and FeOx Coatings on Al2O3

et al. 2018

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“…Through MOCVD metal oxide deposition, no solvents are used, and no further post-treatment, such as calcination, filtration, and drying is required. [45,46] This method also fabricates metal oxide layers with better uniformity and better size distributions because of its inherent characteristics. [47] During the past years, MOCVD has been mostly used in fabrication of thin-layer electronics in the semiconductors industry.…”

Section: Introductionmentioning

confidence: 99%

Strong Promoting Effect of Gold Nanoparticles on the CO Abatement Catalytic Activity of CoO_x/Clay‐Bonded SiC Catalysts Produced by AA‐MOCVD Method Using Co(acac)₂ as Precursor

et al. 2020

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Clay-bonded SiC supported cobalt oxide catalysts were produced by the aerosol-assisted metal organic chemical vapor deposition method (AA-MOCVD) using Co(acac) 2 as precursor. Deposition temperatures 270 and 300°C were the most appropriate for the synthesis of a composite catalyst of high activity for the CO conversion reaction. A cone-shaped crystal habit is the dominant morphology. The catalysts were decorated with Au nanoparticles (NPs) of sizes in the range of 5-10 nm. This substantially improved the activity of the catalysts, lowering the onset temperature of activity by about 50°C. Ambient-pressure X-ray photoelectron spectroscopy (APXPS) was used to investigate in situ the electronic state of cobalt and gold during CO oxidation. APXPS results show that while Au remains in the metallic state during the reaction, it enhances the reduction of Co 3 + to Co 2 +. Au NPs adsorb CO molecules from the gas phase and supply them to the neighbor cobalt oxide particles.

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“…Suitable MOCVD precursors are required to be volatile, thermally stable at vaporization, nontoxic, stable in air and easy to prepare in high yields . Pt forms volatile compounds with methyl, allyl, cyclopentadienyl (Cp) and β‐diketonato ligands . These types of Pt precursors were usually used for a definite purpose.…”

Section: Introductionmentioning

confidence: 99%

“…These types of Pt precursors were usually used for a definite purpose. For example, dimethylplatinum(II) compounds have been used for Pt nanoparticle deposition for catalysts . Trimethylplatinum(IV) compounds with Cp or its derivatives were widely used for deposition of Pt films with compact structure and low roughness for microelectronic and protective coating applications .…”

Section: Introductionmentioning

confidence: 99%

Chemical vapour deposition of platinum films on electrodes for pacemakers: Novel precursors and their thermal properties

Dorovskikh

Zharkova

Turgambaeva

et al. 2016

Applied Organom Chemis

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Air-stable trimethylplatinum(IV) β-diketonate complexes of general formula (CH 3 ) 3 Pt(L)Py (L = R 1 COCHCOR 2 ; R 1 = R 2 = CF 3 (hfac), t Bu (thd), CH 3 (acac); R 1 = CF 3 , R 2 = t Bu (ptac), CH 3 (tfac); Py = pyridine) have been synthesized in high yields. The thermal properties of (CH 3 ) 3 Pt(L)Py were investigated using thermogravimetry/differential thermal analysis and flow method to demonstrate their suitability as metal-organic chemical vapour deposition precursors. Thermolysis of vaporized (CH 3 ) 3 Pt(acac)Py in vacuum and in the presence of hydrogen or oxygen was studied under conditions of low-pressure chemical vapour deposition using an original technique. Using this precursor, Pt films were deposited on electrodes for pacemakers under various conditions. The composition, structure, morphology and electrochemical properties of the deposited films were investigated using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and cyclic voltammetry and LCR measurements. Pt films deposited in the presence of oxygen have a fractal-like morphology as a result the highest values of real surface areas (851-943 mm 2 ) and capacity (5-8.5 μF mm −2 ).

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Synthesis of nanostructured Pt/oxide catalyst particles by MOCVD process at ambient pressure

Cited by 17 publications

References 20 publications

On the Activity Enhancing Role of Iron Oxide for Noble Metal Oxidation Catalysts: A CVD-Based Study with Differently Structured Combinations of Pt and FeOx Coatings on Al2O3

On the Activity Enhancing Role of Iron Oxide for Noble Metal Oxidation Catalysts: A CVD-Based Study with Differently Structured Combinations of Pt and FeOx Coatings on Al2O3

Strong Promoting Effect of Gold Nanoparticles on the CO Abatement Catalytic Activity of CoO_x/Clay‐Bonded SiC Catalysts Produced by AA‐MOCVD Method Using Co(acac)₂ as Precursor

Chemical vapour deposition of platinum films on electrodes for pacemakers: Novel precursors and their thermal properties

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Synthesis of nanostructured Pt/oxide catalyst particles by MOCVD process at ambient pressure

Cited by 17 publications

References 20 publications

On the Activity Enhancing Role of Iron Oxide for Noble Metal Oxidation Catalysts: A CVD-Based Study with Differently Structured Combinations of Pt and FeOx Coatings on Al2O3

On the Activity Enhancing Role of Iron Oxide for Noble Metal Oxidation Catalysts: A CVD-Based Study with Differently Structured Combinations of Pt and FeOx Coatings on Al2O3

Strong Promoting Effect of Gold Nanoparticles on the CO Abatement Catalytic Activity of CoOx/Clay‐Bonded SiC Catalysts Produced by AA‐MOCVD Method Using Co(acac)2 as Precursor

Chemical vapour deposition of platinum films on electrodes for pacemakers: Novel precursors and their thermal properties

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Strong Promoting Effect of Gold Nanoparticles on the CO Abatement Catalytic Activity of CoO_x/Clay‐Bonded SiC Catalysts Produced by AA‐MOCVD Method Using Co(acac)₂ as Precursor