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The effect of coke lay-down on n-heptane reforming on Pt and Pt-Sn catalysts

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Title: The effect of coke lay-down on n-heptane reforming on Pt and Pt-Sn catalysts
Authors: Bowker, M.1, Aslam, T.1, Roebuck, M.1, Moser, M.1,2
Source: Applied Catalysis A: General. Jan2004, Vol. 257 Issue 1, p57. 9p.
Subjects: Heptane, Catalysts, Platinum compounds, Strontium
Abstract: In this paper, we report detailed studies regarding the reforming of n-heptane and related molecules carried out under near-industrial conditions on supported Pt and Pt-Sn catalysts of the type used in industry. We have correlated the performance of these catalysts with the level of coke laid down on the surface measured by TGA. The results indicate that the presence of coke reduces hydrogenolysis/cracking and favours aromatisation. The presence of tin in the catalyst produces much faster coke lay-down, and, in turn, this gives higher selectivity to the desired products in a much shorter time on stream. The initial rate of coke lay-down is very rapid, but it slows to a near-zero rate after this initial period, when 2% of the catalyst weight of carbon has been deposited on the surface; we propose that this is a near-monolayer passivating layer which promotes toluene production. The presence of chlorine on the support increases the activity, the cracking and the coking. Consideration is given to the nature of the species responsible for the coking of the catalyst. [Copyright &y& Elsevier]
Copyright of Applied Catalysis A: General 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.)
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DbLabel: Engineering Source
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PubTypeId: academicJournal
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  Data: The effect of coke lay-down on n-heptane reforming on Pt and Pt-Sn catalysts
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  Data: <searchLink fieldCode="AR" term="%22Bowker%2C+M%2E%22">Bowker, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Aslam%2C+T%2E%22">Aslam, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Roebuck%2C+M%2E%22">Roebuck, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Moser%2C+M%2E%22">Moser, M.</searchLink><relatesTo>1,2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Catalysis+A%3A+General%22">Applied Catalysis A: General</searchLink>. Jan2004, Vol. 257 Issue 1, p57. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Heptane%22">Heptane</searchLink><br /><searchLink fieldCode="DE" term="%22Catalysts%22">Catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Platinum+compounds%22">Platinum compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Strontium%22">Strontium</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: In this paper, we report detailed studies regarding the reforming of n-heptane and related molecules carried out under near-industrial conditions on supported Pt and Pt-Sn catalysts of the type used in industry. We have correlated the performance of these catalysts with the level of coke laid down on the surface measured by TGA. The results indicate that the presence of coke reduces hydrogenolysis/cracking and favours aromatisation. The presence of tin in the catalyst produces much faster coke lay-down, and, in turn, this gives higher selectivity to the desired products in a much shorter time on stream. The initial rate of coke lay-down is very rapid, but it slows to a near-zero rate after this initial period, when 2% of the catalyst weight of carbon has been deposited on the surface; we propose that this is a near-monolayer passivating layer which promotes toluene production. The presence of chlorine on the support increases the activity, the cracking and the coking. Consideration is given to the nature of the species responsible for the coking of the catalyst. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Catalysis A: General 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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      – Type: doi
        Value: 10.1016/S0926-860X(03)00613-6
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 57
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      – SubjectFull: Heptane
        Type: general
      – SubjectFull: Catalysts
        Type: general
      – SubjectFull: Platinum compounds
        Type: general
      – SubjectFull: Strontium
        Type: general
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      – TitleFull: The effect of coke lay-down on n-heptane reforming on Pt and Pt-Sn catalysts
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            NameFull: Aslam, T.
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              M: 01
              Text: Jan2004
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              Y: 2004
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            – TitleFull: Applied Catalysis A: General
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