The Metal–Support Interaction Concerning the Particle Size Effect of Pd/Al<sub>2</sub>O<sub>3</sub> on Methane Combustion

Murata, Keiko; Mahara, Yuji; Ohyama, Junya; Yamamoto, Yuta; Arai, Shigeo; Satsuma, Atsushi

doi:10.1002/ange.201709124

Cited by 87 publications

(61 citation statements)

References 49 publications

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“…Based on our results, higher activities of Cr/Al catalysts can be related with smaller metal particle sizes and distribution of chromium on alumina. The influence of metal particle size in methane conversion was also reported by some reseachers [29][30]. Chromium is known as the most efficient catalyst in oxidation, other catalysts displayed comparable or even lower activity compared with alumina-supported chromium catalyst [31].…”

Section: Characterization Of the Catalystsmentioning

confidence: 54%

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Mardwita

Yusmartini

Wisudawati

2020

Bull. Chem. React. Eng. Catal.

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A series of alumina supported cobalt and chromium catalysts with different metal loadings were prepared by impregnation method. Six types of alumina supported cobalt and chromium catalysts contained 5 wt%, 10 wt%, and 15 wt% loadings were produced and tested in methane oxidation. The catalysts were characterized by using x-ray diffraction (XRD) and carbon monoxide chemisorption (CO chemisorption). The XRD results do not confirmed any features of cobalt and chromium metal. The metal sizes for both catalysts were larger in high loading as shown by CO chemisorption results. Methane conversion results showed that the conversion increases with increasing the metal loading, however supported chromium catalysts were higher in activities compared to supported cobalt catalysts. Thermal stability tests on 15 wt% Co/Al and 15 wt% Cr/Al catalyst showed that supported chromium catalyst is more stable and maintain the particle size due to its strong interaction with support, while supported cobalt catalyst decrease in methane conversion due to deactivation of the catalyst. Copyright © 2020 BCREC Group. All rights reserved

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Section: Characterization Of the Catalystsmentioning

confidence: 54%

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Mardwita

Yusmartini

Wisudawati

2020

Bull. Chem. React. Eng. Catal.

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“…[18 -21] Decreasing the size of those supported nanoparticles allows the enhancement of catalyst performances. [7,16,18,[22][23][24] While small particles and good dispersion can be obtained on various supports, a significant fraction of metal can be lost through its incorporation into the support through the formation of hardly reducible metal-aluminum mixed oxides in the case of alumina. [25 -27] The reduction of such metal incorporated into the support during the impregnation phase requires the use of high temperature treatment under reductive atmosphere, leading typically to severe sintering of the particles, with nanoparticle size possibly exceeding 10 nm for Cu, Ni, and Co, up to 80 nm for Fe.…”

Section: Introductionmentioning

confidence: 99%

Metal(II) Formates (M = Fe, Co, Ni, and Cu) Stabilized by Tetramethylethylenediamine (tmeda): Convenient Molecular Precursors for the Synthesis of Supported Nanoparticles

Margossian

Larmier

Allouche

et al. 2019

Helvetica Chimica Acta

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γ‐Alumina supported 3d transition‐metal nanoparticles are commonly used catalysts for several industrial reactions, such as Fischer‐Tropsch, reforming, methanation, and hydrogenation reactions. However, the activity of such catalyst is often limited by the low metal dispersion and a high content of irreducible metal, inherent to the conventional preparation methods in aqueous phase. In this context, we have recently shown that [{Ni(μ2‐OCHO)(OCHO)(tmeda)}2(μ2‐OH2)] (tmeda=tetramethylethylenediamine) is a suitable molecular precursor for the formation of 1–2 nm large nanoparticles onto alumina. Here, we explore the synthesis of the corresponding Fe, Co, and Cu molecular precursors, namely [{Fe(μ2‐OCHO)(OCHO)(tmeda)}4], [{Co(μ2‐OCHO)(OCHO)(tmeda)}2(μ2‐OH2 )], [Cu(κ2‐OCHO)2(tmeda)], which are, like the Ni precursor, soluble in a range of solvents, rendering them convenient metal precursors for the preparation of supported metallic nanoparticles on γ‐alumina. Using a specific adsorption of the molecular precursor on γ‐alumina in a suitable organic solvent, treatment under H2 provides small and narrowly distributed Fe (2.5±0.9 nm), Co (3.0±1.2 nm), Ni (1.7±0.5 nm), and Cu (2.1±1.5 nm) nanoparticles. XAS shows that the proportion of MAl2O4 (M = Co, Ni, Cu) is small, thus illustrating the advantage of using these tailor‐made molecular precursors.

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“…In a high temperature catalytic reaction, a strong metal-support interaction may leads to the formation of a large metal particle. It is a known fact that the presence of a large metal particle on a support surface may serve as an inactive phase [10], therefore, it is necessary to make the metal particle as small as possible that leads to the high dispersion of active phase. Khangale et al [11] studied the effect of activation with carbon monoxide (CO) for Co/-Al2O3 catalyst, they found that CO can activates Co/-Al2O3 catalyst at low temperature and improves catalyst reduction which is produced a higher number of active sites in the catalyst, hence increased the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Effects of Calcination Temperatures on The Catalytic Activities of Alumina Supported Cobalt and Chromium Catalysts

Mardwita

Yusmartini

Wisudawati

2019

Bull. Chem. React. Eng. Catal.

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Catalysts properties are important for catalytic reactions. The interaction between support and metal in a catalyst is resulted from catalyst preparation. In this study, gamma-alumina (Al2O3) supported cobalt (Co) and chromium (Cr) catalysts were prepared by impregnation method and calcined at two different temperatures, they are 400 °C for 4 hours and 800 °C for 4 hours. The resulted catalysts contained 10 wt.% of metal and denoted as Co/Al2O3(400), Co/Al2O33(800), Cr/Al2O3(400), and Cr/Al2O3(800) catalysts. The surface and state of the catalysts were examined by using x-ray diffraction (XRD), x-ray photoelectron spectrometer (XPS) and transmission electron microscopy (TEM). The XRD result reveals that strong interaction between Co and Al2O3 due to a formation of higher cobalt oxide. The XRD result further indicates aggregation and strong support metal interaction between Co and Al2O3 during calcination. On the other hand, TEM result showed that large Co particle was observed on Al2O3. The Cr/Al2O3 catalysts were characterized by using XPS. The XPS results showed that Cr/Al2O3(800) catalyst was dominated by Cr 6+ species at binding energy 579.04 eV, indicating high dispersion of Cr on Al2O3. Moreover, Cr metal particle was not observed on XRD and TEM image. All the characterization results provide information that the impregnated metal on Al2O3 showed different properties. Co metal particle tends to be more oxidized and formed large particle, however it was not observed on Cr metal particle.A catalyst contains two or more important compositions; they are a metal, a promoter, and a support. The metal is usually dispersed on a support to obtain a high surface area of an active metal. The catalytic property of the metal mainly depends on the interaction between metal and support. Therefore, metal-support interaction is important for the final catalysts properties. Some supports such as alumina (Al2O3),

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The Metal–Support Interaction Concerning the Particle Size Effect of Pd/Al₂O₃ on Methane Combustion

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 87 publications

References 49 publications

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Metal(II) Formates (M = Fe, Co, Ni, and Cu) Stabilized by Tetramethylethylenediamine (tmeda): Convenient Molecular Precursors for the Synthesis of Supported Nanoparticles

Effects of Calcination Temperatures on The Catalytic Activities of Alumina Supported Cobalt and Chromium Catalysts

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The Metal–Support Interaction Concerning the Particle Size Effect of Pd/Al2O3 on Methane Combustion

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 87 publications

References 49 publications

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Metal(II) Formates (M = Fe, Co, Ni, and Cu) Stabilized by Tetramethylethylenediamine (tmeda): Convenient Molecular Precursors for the Synthesis of Supported Nanoparticles

Effects of Calcination Temperatures on The Catalytic Activities of Alumina Supported Cobalt and Chromium Catalysts

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The Metal–Support Interaction Concerning the Particle Size Effect of Pd/Al₂O₃ on Methane Combustion