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CO oxidation on ceria- and manganese oxide-supported gold catalysts

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Title: CO oxidation on ceria- and manganese oxide-supported gold catalysts
Authors: Chang, Li-Hsin1, Sasirekha, Natarajan1, Rajesh, Baskaran1, Chen, Yu-Wen ywchen@cc.ncu.edu.tw
Source: Separation & Purification Technology. Dec2007, Vol. 58 Issue 1, p211-218. 8p.
Subjects: Chemical inhibitors, Cerium oxides, Electron microscopy, Low temperatures
Abstract: Abstract: A comparative study on ceria- and manganese oxide-supported gold catalysts for the oxidation of carbon monoxide at low temperature was investigated. Nanostructured gold catalysts supported on CeO2 and MnO2 were prepared by deposition–precipitation method. The influence of calcination temperatures before (200°C and 400°C) and after (120°C and 180°C) gold loading on CeO2 and the effect of crystalline nature on the catalytic activity of Au/MnO2 were also studied. The structure, morphology, and electronic properties of the catalysts were analyzed by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. CeO2 prepared in this study was in nanosize range, which could confine the Au particles in nanosize range. Fine dispersion of gold nanoparticles on CeO2 and MnO2 was confirmed. Existence of Au0 and Au3+ states were noticed on Au/CeO2 catalysts, whereas only metallic gold was detected on Au/MnO2. The redox efficiency of CeO2 and MnO2 is responsible for high CO conversion at room temperature. Au/CeO2 (support was calcined at 400°C and Au catalyst was calcined at 180°C) demonstrates higher catalytic activity for CO oxidation than Au/MnO2. The co-existence of metallic and oxidized gold species on Au/CeO2 seems to be the main reason for the higher activity of Au/CeO2 with respect to Au/MnO2. [Copyright &y& Elsevier]
Copyright of Separation & Purification Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 27244745
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  Data: CO oxidation on ceria- and manganese oxide-supported gold catalysts
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  Data: <searchLink fieldCode="AR" term="%22Chang%2C+Li-Hsin%22">Chang, Li-Hsin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Sasirekha%2C+Natarajan%22">Sasirekha, Natarajan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rajesh%2C+Baskaran%22">Rajesh, Baskaran</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+Yu-Wen%22">Chen, Yu-Wen</searchLink><i> ywchen@cc.ncu.edu.tw</i>
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  Data: <searchLink fieldCode="JN" term="%22Separation+%26+Purification+Technology%22">Separation & Purification Technology</searchLink>. Dec2007, Vol. 58 Issue 1, p211-218. 8p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Chemical+inhibitors%22">Chemical inhibitors</searchLink><br /><searchLink fieldCode="DE" term="%22Cerium+oxides%22">Cerium oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+microscopy%22">Electron microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Low+temperatures%22">Low temperatures</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: A comparative study on ceria- and manganese oxide-supported gold catalysts for the oxidation of carbon monoxide at low temperature was investigated. Nanostructured gold catalysts supported on CeO2 and MnO2 were prepared by deposition–precipitation method. The influence of calcination temperatures before (200°C and 400°C) and after (120°C and 180°C) gold loading on CeO2 and the effect of crystalline nature on the catalytic activity of Au/MnO2 were also studied. The structure, morphology, and electronic properties of the catalysts were analyzed by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. CeO2 prepared in this study was in nanosize range, which could confine the Au particles in nanosize range. Fine dispersion of gold nanoparticles on CeO2 and MnO2 was confirmed. Existence of Au0 and Au3+ states were noticed on Au/CeO2 catalysts, whereas only metallic gold was detected on Au/MnO2. The redox efficiency of CeO2 and MnO2 is responsible for high CO conversion at room temperature. Au/CeO2 (support was calcined at 400°C and Au catalyst was calcined at 180°C) demonstrates higher catalytic activity for CO oxidation than Au/MnO2. The co-existence of metallic and oxidized gold species on Au/CeO2 seems to be the main reason for the higher activity of Au/CeO2 with respect to Au/MnO2. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Separation & Purification Technology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.seppur.2007.07.031
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      – Code: eng
        Text: English
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        StartPage: 211
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      – SubjectFull: Chemical inhibitors
        Type: general
      – SubjectFull: Cerium oxides
        Type: general
      – SubjectFull: Electron microscopy
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      – SubjectFull: Low temperatures
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      – TitleFull: CO oxidation on ceria- and manganese oxide-supported gold catalysts
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            NameFull: Sasirekha, Natarajan
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            NameFull: Rajesh, Baskaran
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            – D: 01
              M: 12
              Text: Dec2007
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              Y: 2007
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