Equilibria between Peroxo and Hydroperoxo Species in the Titanosilicates: An In Situ High-Resolution XANES Investigation

Authors

  • Carmelo Prestipino Dr.,

    1. Department of Inorganic, Physical and Materials Chemistry, University of Torino, 10125 Torino, Italy, Fax (+39) 011-6707855
    2. NIS Centre of Excellence, Turin, Italy
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  • Francesca Bonino Dr.,

    1. Department of Inorganic, Physical and Materials Chemistry, University of Torino, 10125 Torino, Italy, Fax (+39) 011-6707855
    2. NIS Centre of Excellence, Turin, Italy
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  • Sandro Usseglio,

    1. Department of Inorganic, Physical and Materials Chemistry, University of Torino, 10125 Torino, Italy, Fax (+39) 011-6707855
    2. NIS Centre of Excellence, Turin, Italy
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  • Alessandro Damin Dr.,

    1. Department of Inorganic, Physical and Materials Chemistry, University of Torino, 10125 Torino, Italy, Fax (+39) 011-6707855
    2. NIS Centre of Excellence, Turin, Italy
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  • Andrea Tasso,

    1. Enitecnologie, Via F. Maritano, 26, 20097 San Donato Milanese (MI), Italy
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  • Mario G. Clerici,

    1. Enitecnologie, Via F. Maritano, 26, 20097 San Donato Milanese (MI), Italy
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  • Silvia Bordiga Prof. Dr.,

    1. Department of Inorganic, Physical and Materials Chemistry, University of Torino, 10125 Torino, Italy, Fax (+39) 011-6707855
    2. NIS Centre of Excellence, Turin, Italy
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  • Francesco D′Acapito Dr.,

    1. INFM OGG c/o ESRF, rue J. Horowitz 6, BP 220 38043 Grenoble, France
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  • Adriano Zecchina Prof. Dr.,

    1. Department of Inorganic, Physical and Materials Chemistry, University of Torino, 10125 Torino, Italy, Fax (+39) 011-6707855
    2. NIS Centre of Excellence, Turin, Italy
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  • Carlo Lamberti Dr.

    1. Department of Inorganic, Physical and Materials Chemistry, University of Torino, 10125 Torino, Italy, Fax (+39) 011-6707855
    2. NIS Centre of Excellence, Turin, Italy
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  • XANES=X-ray absorption near edge structure

Abstract

original image

Water is the key factor: For titanium-silicalite-1 in aqueous H2O2, the driving force that governs the equilibrium between the uncolored end-on η1-titanium–hydroperoxo complex and the yellow-colored side-on η2-Ti-peroxo complex (see picture) is the amount of water present in the system, as proven by in situ X-ray absorption near edge structure spectroscopy performed at 77 K.

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