Formation, reactivity and catalytic activity-selectivity of Pt(CLx)(CONH)y species prepared by interaction of H2PtCl6 with nylon supports

Paul A. Sermon, Che Husna Azhari

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Abstract

Samples of platinum supported on nylon-66 have been prepared by the adsorption of hexachloroplatinic acid from aqueous solution and characterised. After reduction these catalysts were selective in the hydrogenation of benzene (373 - 493 K, H2:hydrocarbon = 18) to cyclohexene rather than cyclohexane, while in the hydrogenation of cyclohexene (373 - 453 K, H2: hydrocarbon = 214) the samples were active without simultaneous disproportionation. Such selectivity was greatest for Pt/nylon with highest Pt loading. Apparent turnover numbers for both reactions on Pt were low (possibly reflecting the difficulty of assessing the active surface areas of these catalysts). Activation energies for both reactions suggest the importance of reactant product diffusion into the porous support. Since the active species (i.e. -NH⋯ PtClx⋯CO-, where x remains uncertain)are thought to be coordinatively bonded to support amide groups, it is an important finding that Pt in a positive oxidation state is active in these reactions.

Original languageEnglish
Pages (from-to)267-277
Number of pages11
JournalJournal of Molecular Catalysis
Volume59
Issue number2
DOIs
Publication statusPublished - 1 Apr 1990
Externally publishedYes

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Catalyst selectivity
Hydrogenation
Catalyst activity
Hydrocarbons
Catalysts
Cyclohexane
Amides
Platinum
Benzene
Activation energy
Adsorption
Oxidation
Acids

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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title = "Formation, reactivity and catalytic activity-selectivity of Pt(CLx)(CONH)y species prepared by interaction of H2PtCl6 with nylon supports",
abstract = "Samples of platinum supported on nylon-66 have been prepared by the adsorption of hexachloroplatinic acid from aqueous solution and characterised. After reduction these catalysts were selective in the hydrogenation of benzene (373 - 493 K, H2:hydrocarbon = 18) to cyclohexene rather than cyclohexane, while in the hydrogenation of cyclohexene (373 - 453 K, H2: hydrocarbon = 214) the samples were active without simultaneous disproportionation. Such selectivity was greatest for Pt/nylon with highest Pt loading. Apparent turnover numbers for both reactions on Pt were low (possibly reflecting the difficulty of assessing the active surface areas of these catalysts). Activation energies for both reactions suggest the importance of reactant product diffusion into the porous support. Since the active species (i.e. -NH⋯ PtClx⋯CO-, where x remains uncertain)are thought to be coordinatively bonded to support amide groups, it is an important finding that Pt in a positive oxidation state is active in these reactions.",
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AU - Sermon, Paul A.

AU - Azhari, Che Husna

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N2 - Samples of platinum supported on nylon-66 have been prepared by the adsorption of hexachloroplatinic acid from aqueous solution and characterised. After reduction these catalysts were selective in the hydrogenation of benzene (373 - 493 K, H2:hydrocarbon = 18) to cyclohexene rather than cyclohexane, while in the hydrogenation of cyclohexene (373 - 453 K, H2: hydrocarbon = 214) the samples were active without simultaneous disproportionation. Such selectivity was greatest for Pt/nylon with highest Pt loading. Apparent turnover numbers for both reactions on Pt were low (possibly reflecting the difficulty of assessing the active surface areas of these catalysts). Activation energies for both reactions suggest the importance of reactant product diffusion into the porous support. Since the active species (i.e. -NH⋯ PtClx⋯CO-, where x remains uncertain)are thought to be coordinatively bonded to support amide groups, it is an important finding that Pt in a positive oxidation state is active in these reactions.

AB - Samples of platinum supported on nylon-66 have been prepared by the adsorption of hexachloroplatinic acid from aqueous solution and characterised. After reduction these catalysts were selective in the hydrogenation of benzene (373 - 493 K, H2:hydrocarbon = 18) to cyclohexene rather than cyclohexane, while in the hydrogenation of cyclohexene (373 - 453 K, H2: hydrocarbon = 214) the samples were active without simultaneous disproportionation. Such selectivity was greatest for Pt/nylon with highest Pt loading. Apparent turnover numbers for both reactions on Pt were low (possibly reflecting the difficulty of assessing the active surface areas of these catalysts). Activation energies for both reactions suggest the importance of reactant product diffusion into the porous support. Since the active species (i.e. -NH⋯ PtClx⋯CO-, where x remains uncertain)are thought to be coordinatively bonded to support amide groups, it is an important finding that Pt in a positive oxidation state is active in these reactions.

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