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Structure and functional properties of ceramic oxygen-conducting membranes

Vladimir V. Pankov 1Maria I. Ivanovskaya 2Dzmitry A. Kotsikau 2Vladimir A. Lomonosov 1Leanid V. Makhnach 1Vladislav A. Sadykov 3

1. Belarusian State University (BSU), F. Skaryna av. 4, Minsk 220050, Belarus
2. Research Institute of physical-chemical problems (FHP), Leningradskaja 14, Minsk 220050, Belarus
3. Boreskov Institute of Catalysis (BIC), pr. akad. Lavrentieva, 5, Novosibirsk 630090, Russian Federation

Abstract

The oxygen-conducting membrane consists of La1.8Sr0.2NiO4 gas-tight layer (100 mkm). The conditions of formation of the layer have been studied in order to optimize its micro-structure for effective oxygen transport. La1.8Sr0.2NiO4 membranes were found to be promising materials for syn-gas (CO+H2) generators. High effectiveness of conversion of hydrocarbons into syn-gas in TPO and TPSC processes is reached by covering the La1.8Sr0.2NiO4 gas-tight layer with catalytically active Ce–Sm–O/Ru(Pt) or Ce–Zr–La–O/Ru(Pt) oxide nanocomposites. The catalytically active compounds were prepared by sol-gel approach using inorganic precursors. They were fabricated by repeated deposition of the corresponding co-precipitated metal hydroxides onto the membrane, and annealed at 600°C. It was found that the presence of La1.8Sr0.2NiO4//Ce–Zr–La–O/Ru hetero-junction increases H2 yield and enhances the selectivity of TPSC process (1% of CH4 + 1% of H2O, He). The deposition of the thin porous catalytic layers leads to the reduction of possible surface inhibition of oxygen diffusion.

The work has been partly supported by ISTC project No 3234
 

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Related papers

Presentation: Poster at E-MRS Fall Meeting 2008, Symposium D, by Vladimir V. Pankov
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-07 13:42
Revised:   2009-06-07 00:48