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Chemistry for Sustainable Development

2012 year, number 2

Catalytic Activity of Cе-, Zr- and Mn-Containing Oxide Layers on Titanium in the Process of Biomass Gasification

M. S. VASILYEVA1, V. S. RUDNEV2, N. B. KONDRIKOV1, F. WIEDENMANN3, S. VYBORNOV4, T. P. YAROVAYA5 and X. JIANG4
1 Far East Federal University,
Ul. Sukhanova 8, Vladivostok 690950 (Russia)
sol@chem.dvgu.ru
2 Institute of Chemistry, Far East Branch of the Russian Academy of Sciences,
Pr. 100-letiya Vladivostoka 159, Vladivostok 690022 (Russia)
rudnevvs@ich.dvo.ru
3 Institute of Energy Technique, University of Siegen,
Paul-Bonatz-Str. 9-11, 57076 Siegen (Germany)
4 Institute of Materials Engineering, University of Siegen,
Paul-Bonatz-Str. 9-11, 57076 Siegen (Germany)
Keywords: oxide coatings, titanium, plasma electrolytic oxidation, catalytic steam conversion of naphthalene
Pages: 135–142

Abstract

Composition, surface structure (including those after annealing at high temperature) and the catalytic activity in the steam conversion of naphthalene were studied for Ce-, Zr- and Mn-containing oxide layers obtained on titanium by means of plasma electrolytic oxidation. The composition and structure of oxide systems were studied by means of XRD phase analysis, energy dispersion analysis and scanning electron microscopy. It was demonstrated that Ce-, Zr-containing structures exhibit a rather high thermal stability: the elemental and phase composition, the structure of their surface remain almost unchanged after annealing in atmospheric air at the temperature values up to 800 °С. The catalytic studies demonstrated a rather high activity of Ce-, Zr-containing coatings in the reaction of naphthalene steam conversion at the temperature values up to 850 °С. Mn-containing oxide structures have developed surface covered with nanowhiskers those were not detected after thermal treatment. Mn-containing oxide systems exhibited a lower level of naphthalene conversion as compared to Се-, Zr-containing coatings, which could be connected with substantial changing their surface and with the formation of low-active fused manganese silicates at high temperature values.