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Study of n-octane hydrocracking and hydroisomerization over Pt/HY zeolites using the reactors of different configurations

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Title: Study of n-octane hydrocracking and hydroisomerization over Pt/HY zeolites using the reactors of different configurations
Authors: Kuznetsov, Peter N.1 kuzpn@krsk.info
Source: Journal of Catalysis. Aug2003, Vol. 218 Issue 1, p12. 12p.
Subjects: Diffusion, Zeolites
Abstract: The conversion of n-octane over a series of monofunctional HY zeolites, which differed with the contents of Na and over the bifunctional Pt/HY zeolites differed with the contents of Pt, was studied as function of the balance among the specific activity of the components, the distribution of the metallic sites over zeolite surfaces and reaction conditions. The activities of individual metal and zeolite components were quantified in the reactions of 1-hexene hydrogenation and n-octane cracking, respectively. Gradientless reactors of different configurations were applied to rationalize the contribution of hydrogenation, dehydrogenation, cracking, isomerization, oligomerization, and catalyst deactivation reactions to the reaction pathways over the bifunctional Pt/HY zeolites. The conceptual bifunctional mechanism involving the dehydrogenation of n-octane into olefinic counterparts was demonstrated experimentally by using the flow circulation unit equipped with two reactors connected in series and loaded with separated HY and Pt components. The limiting steps were determined depending on the activity of the Pt component in Pt/HY. It was shown that an optimum concentration of Pt sites exists in HY zeolites which corresponds to a maximum cracking activity followed by a significant decrease as the concentration of metallic sites further increases. The effect of diffusion transfer of branched octene intermediates inside the zeolite cavities from the acidic sites to Pt sites on the rates and reaction pathways over Pt/HY zeolites is argued. [Copyright &y& Elsevier]
Copyright of Journal of Catalysis is the property of Academic Press Inc. 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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  Data: Study of <f>n</f>-octane hydrocracking and hydroisomerization over Pt<f>/</f>HY zeolites using the reactors of different configurations
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  Data: <searchLink fieldCode="AR" term="%22Kuznetsov%2C+Peter+N%2E%22">Kuznetsov, Peter N.</searchLink><relatesTo>1</relatesTo><i> kuzpn@krsk.info</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Catalysis%22">Journal of Catalysis</searchLink>. Aug2003, Vol. 218 Issue 1, p12. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Diffusion%22">Diffusion</searchLink><br /><searchLink fieldCode="DE" term="%22Zeolites%22">Zeolites</searchLink>
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  Data: The conversion of <f>n</f>-octane over a series of monofunctional HY zeolites, which differed with the contents of Na and over the bifunctional Pt<f>/</f>HY zeolites differed with the contents of Pt, was studied as function of the balance among the specific activity of the components, the distribution of the metallic sites over zeolite surfaces and reaction conditions. The activities of individual metal and zeolite components were quantified in the reactions of 1-hexene hydrogenation and <f>n</f>-octane cracking, respectively. Gradientless reactors of different configurations were applied to rationalize the contribution of hydrogenation, dehydrogenation, cracking, isomerization, oligomerization, and catalyst deactivation reactions to the reaction pathways over the bifunctional Pt<f>/</f>HY zeolites. The conceptual bifunctional mechanism involving the dehydrogenation of <f>n</f>-octane into olefinic counterparts was demonstrated experimentally by using the flow circulation unit equipped with two reactors connected in series and loaded with separated HY and Pt components. The limiting steps were determined depending on the activity of the Pt component in Pt<f>/</f>HY. It was shown that an optimum concentration of Pt sites exists in HY zeolites which corresponds to a maximum cracking activity followed by a significant decrease as the concentration of metallic sites further increases. The effect of diffusion transfer of branched octene intermediates inside the zeolite cavities from the acidic sites to Pt sites on the rates and reaction pathways over Pt<f>/</f>HY zeolites is argued. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Catalysis is the property of Academic Press Inc. 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/S0021-9517(03)00139-8
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      – Code: eng
        Text: English
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        PageCount: 12
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      – SubjectFull: Diffusion
        Type: general
      – SubjectFull: Zeolites
        Type: general
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      – TitleFull: Study of <f>n</f>-octane hydrocracking and hydroisomerization over Pt<f>/</f>HY zeolites using the reactors of different configurations
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              Text: Aug2003
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