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Comparison of the catalysed decomposition of hydrogen peroxide over superconducting and insulating barium cuprates—kinetics of decomposition over Y 2 BaCuO 5
Author(s) -
Khalil Laila B.,
Mourad Wedad E.,
Rophael Magdy W.
Publication year - 1994
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280610205
Subject(s) - cuprate , perovskite (structure) , decomposition , barium , superconductivity , hydrogen peroxide , materials science , thermal decomposition , catalysis , kinetics , hydrogen , chemistry , inorganic chemistry , crystallography , physics , condensed matter physics , biochemistry , organic chemistry , quantum mechanics
Catalytic activities of two non‐conducting cuprates (Ba 2 Cu 3 O 5 , Y 2 BaCuO 5 ) and a superconducting cuprate YBa 2 Cu 3 O 7–δ , prepared by two different methods, were compared using H 2 O 2 solution. The two non‐conducting barium cuprates were found to be about two orders of magnitude more active than the superconducting perovskite‐like YBa 2 Cu 3 O 7–δ . The near coincidence of the kinetic curves for the catalysed decomposition of H 2 O 2 over YBa 2 Cu 3 O 7–δ , prepared either from the perovskite‐like Ba 2 Cu 3 O 5 and Y 2 O 3 or from its components, proves that Ba 2 Cu 3 O 5 is essential in the formation of YBa 2 Cu 3 O 7–δ . First‐order kinetics were observed for the catalysed decomposition of H 2 O 2 solution over the non‐perovskite Y 2 BaCuO 5 at the initial stages of the reaction, similar to that of the superconducting perovskite catalyst. A tentative scheme of the possible catalytic reactions for the decomposition of H 2 O 2 solution over the insulator Y 2 BaCuO 5 is given.