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Structure of mono- and bimetallic heterogeneous catalysts based on noble metals obtained by means of fluid technology and metal-vapor synthesis

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Said-Galiev, E. E.
Vasil'kov, A. Yu.
Nikolaev, A. Yu.
Lisitsyn, A. I.
Naumkin, A. V.
Volkov, I. O.
Abramchuk, S. S.
Lependina, O. L.
Khokhlov, A. R.
Shtykova, E. V.

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English

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Abstract

Monometallic nanocomposites are obtained with the use of supercritical carbon dioxide (fluid technique) and metal-vapor synthesis (MVS), while bimetallic nanocomposites of Pt and Au noble metals and gamma-Al2O3 oxide matrix are synthesized by a combination of these two methods. The structures, concentrations, and chemical states of metal atoms in composites are studied by means of small-angle X-ray scattering (SAXS), transparent electron microscopy (TEM), X-ray fluorescent analysis (XFA), and X-ray photoelectron spectroscopy (XPS). The neutral state of metal atoms in clusters is shown by XPS and their size distribution is found according to SAXS; as is shown, it is determined by the pore sizes of the oxide matrices and lies in the range of 1 to 50 nm. The obtained composites manifest themselves as effective catalysts in the oxidation of CO to CO2.

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Russian Journal of Physical Chemistry A

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Maik Nauka/Interperiodica/Springer

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Chemistry, Physical

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