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Gold catalysts on TiO2 support for preferential oxidation of CO in H2 stream: Effect of base agent

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Title: Gold catalysts on TiO2 support for preferential oxidation of CO in H2 stream: Effect of base agent
Authors: Sangeetha, Palanivelu1, Chang, Li-Hsin1, Chen, Yu-Wen ywchen@cc.ncu.edu.tw
Source: Materials Chemistry & Physics. Nov2009, Vol. 118 Issue 1, p181-186. 6p.
Subjects: Metal catalysts, Gold, Titanium dioxide, Catalyst supports, Carbon monoxide, Hydrogen, Oxidation, X-ray diffraction
Abstract: Abstract: Au/TiO2 catalysts were prepared by deposition–precipitation method using various bases such as NaOH, NH4OH and urea. The catalysts were characterized by ICP-MS, XRD, TEM and XPS. The catalytic activity of these catalysts has been investigated for preferential oxidation of carbon monoxide in hydrogen stream. A high gold dispersion and narrow size distribution was obtained for Au/TiO2 catalysts by using different precipitating reagents, such as NaOH, NH4OH and urea. Au/TiO2 catalyst prepared by using NaOH as base agent shows higher deposition of gold on the TiO2 support when compared with other base agents. The uptake of gold on TiO2 decreased as the pH value increased from 5 to 9. The catalytic activity of CO oxidation increases as the metal loading increases and CO selectivity decreased with increasing reaction temperature on all catalysts. Au/TiO2 catalyst prepared by using NaOH as the base agent at low pH ∼6 is found to be the better catalyst, henceforth the catalytic activity is found to be higher for preferential oxidation of CO in H2 stream at 80°C. [Copyright &y& Elsevier]
Copyright of Materials Chemistry & Physics 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: 44580742
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  Data: Gold catalysts on TiO<subscript>2</subscript> support for preferential oxidation of CO in H<subscript>2</subscript> stream: Effect of base agent
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  Data: <searchLink fieldCode="AR" term="%22Sangeetha%2C+Palanivelu%22">Sangeetha, Palanivelu</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chang%2C+Li-Hsin%22">Chang, Li-Hsin</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="%22Materials+Chemistry+%26+Physics%22">Materials Chemistry & Physics</searchLink>. Nov2009, Vol. 118 Issue 1, p181-186. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Metal+catalysts%22">Metal catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Gold%22">Gold</searchLink><br /><searchLink fieldCode="DE" term="%22Titanium+dioxide%22">Titanium dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Catalyst+supports%22">Catalyst supports</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+monoxide%22">Carbon monoxide</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen%22">Hydrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation%22">Oxidation</searchLink><br /><searchLink fieldCode="DE" term="%22X-ray+diffraction%22">X-ray diffraction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract: Au/TiO2 catalysts were prepared by deposition–precipitation method using various bases such as NaOH, NH4OH and urea. The catalysts were characterized by ICP-MS, XRD, TEM and XPS. The catalytic activity of these catalysts has been investigated for preferential oxidation of carbon monoxide in hydrogen stream. A high gold dispersion and narrow size distribution was obtained for Au/TiO2 catalysts by using different precipitating reagents, such as NaOH, NH4OH and urea. Au/TiO2 catalyst prepared by using NaOH as base agent shows higher deposition of gold on the TiO2 support when compared with other base agents. The uptake of gold on TiO2 decreased as the pH value increased from 5 to 9. The catalytic activity of CO oxidation increases as the metal loading increases and CO selectivity decreased with increasing reaction temperature on all catalysts. Au/TiO2 catalyst prepared by using NaOH as the base agent at low pH ∼6 is found to be the better catalyst, henceforth the catalytic activity is found to be higher for preferential oxidation of CO in H2 stream at 80°C. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials Chemistry & Physics 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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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.matchemphys.2009.07.022
    Languages:
      – Code: eng
        Text: English
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      Pagination:
        PageCount: 6
        StartPage: 181
    Subjects:
      – SubjectFull: Metal catalysts
        Type: general
      – SubjectFull: Gold
        Type: general
      – SubjectFull: Titanium dioxide
        Type: general
      – SubjectFull: Catalyst supports
        Type: general
      – SubjectFull: Carbon monoxide
        Type: general
      – SubjectFull: Hydrogen
        Type: general
      – SubjectFull: Oxidation
        Type: general
      – SubjectFull: X-ray diffraction
        Type: general
    Titles:
      – TitleFull: Gold catalysts on TiO2 support for preferential oxidation of CO in H2 stream: Effect of base agent
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            NameFull: Sangeetha, Palanivelu
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            NameFull: Chang, Li-Hsin
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            NameFull: Chen, Yu-Wen
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              Text: Nov2009
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              Y: 2009
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              Value: 118
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