Effects of metal loading and support for supported cobalt catalyst

Das, Taraknath; Deo, Goutam

doi:10.1016/j.cattod.2012.04.028

Cited by 44 publications

(20 citation statements)

References 35 publications

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“…As shown in Figure 1 and 2, with an increase in metal loading, the presence of surface metal species increase and the methane conversion gradually increases, though not detected by XRD. These results are agreed well with the results described by other reseachers [8,28].…”

Section: Characterization Of the Catalystssupporting

confidence: 93%

“…This is similiar for Cr/Al catalysts, the chromium metal size increased from 1.09 nm to 1.6 nm and to 2.1 nm for 5 wt% Cr/Al, 10 wt% Cr/Al, and 15 wt% Cr/Al, respectively. This suggests that with an increase in loading the metal size also increase [28]. However, Co/Al catalysts metal sizes were larger than those observed for Cr/Al catalysts.…”

Section: Characterization Of the Catalystsmentioning

confidence: 83%

“…With an increase in loading the metal crystallite size and the number of surface metal sites increase. The larger number of suface active sites formed with increasing metal loading were able to convert more methane [28]. Thus the metal crystallite size inversely related to the conversion for the supported catalysts containing high cobalt and chromium loadings.…”

Section: Characterization Of the Catalystsmentioning

confidence: 97%

“…Thus the metal crystallite size inversely related to the conversion for the supported catalysts containing high cobalt and chromium loadings. Interaction between cobalt and alumina was also studied by Das and Deo [28], they found that the cobalt metal crystallite size increased with the increasing cobalt loading and the formation of cobalt metal could not be confirmed by the XRD. These results are agreed well with our results.…”

Section: Characterization Of the Catalystsmentioning

confidence: 99%

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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 Catalystssupporting

confidence: 93%

Section: Characterization Of the Catalystsmentioning

confidence: 83%

Section: Characterization Of the Catalystsmentioning

confidence: 97%

Section: Characterization Of the Catalystsmentioning

confidence: 99%

See 2 more Smart Citations

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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“…With all other conditions held equal, cobalt impregnation and further calcination at 450 °C resulted in reduction of S BET and V meso . The decrease of approximately 50 % of pore volume of the catalyst prepared with poly(ethylene oxide) (PEO) (Al‐PEO6 and Al‐PEO8) was related to the partial blockage of the pores . Accordingly, for the Co/Al‐PEO8 sample the average mesopore diameters significantly decrease (≈37 %) after those processes.…”

Section: Resultsmentioning

confidence: 93%

Correlation of Sol–Gel Alumina‐Supported Cobalt Catalyst Processing to Cobalt Speciation, Ethanol Steam Reforming Activity, and Stability

et al. 2017

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The effect of sol–gel alumina characteristics on the supported Co catalyst properties was investigated at the different steps of catalyst preparation. Porous alumina with variable surface reactivity were prepared from the sol–gel transition and the spinodal decomposition induced by polymers. The hydrophobicity of polymer or the calcination temperature controls the amount of the hydroxyl groups. The dried catalysts are composed of cobalt alumina hydrotalcite‐like compounds up to 64 %. After calcination, higher proportions of CoAl2O4 are observed in the alumina presenting a greater content of hydroxyl and hydrotalcite. The Co speciation during activation investigated by Quick X‐ray absorption spectroscopy evidences that both Co3O4 and CoAl2O4 are first fully reduced to CoO and then partially transformed into point‐like Co0 nucleus. The catalysts were highly active in the ethanol steam reforming reaction; however, coke deposition leads to deactivation. This deleterious effect was minimized for catalysts operating with a CoO/Co0 ratio close to 1:3.

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Application of GO in Environmental Science

Zhao

Liu

2014

SpringerBriefs in Physics

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Effects of metal loading and support for supported cobalt catalyst

Cited by 44 publications

References 35 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

Correlation of Sol–Gel Alumina‐Supported Cobalt Catalyst Processing to Cobalt Speciation, Ethanol Steam Reforming Activity, and Stability

Application of GO in Environmental Science

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