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Crystalline Structure and Propylene Oxidation in Complex Bismuth‐Molybdenum Oxide Catalysts
Author(s) -
Manaila R.,
Ionescu N. I.,
Caldararu M.
Publication year - 1980
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19804660128
Subject(s) - molybdate , acrolein , calcination , catalysis , selectivity , molybdenum , coprecipitation , inorganic chemistry , amorphous solid , bismuth , oxide , materials science , chemistry , crystal structure , organic chemistry
Complex BiMo oxide catalysts supported on amorphous SiO 2 were prepared by coprecipitation and tested in the reaction of selective oxidation of propylene to acrolein. They consist of a mixture of molybdate phases and excess MoO 3 . The Fe 2 (MoO 4 )( 3 ) phase was found to have a high concentration of lattice defects, induced by a Mo excess. These defects could be related to the catalytic conversion and to the selectivity to total oxidation by varying the calcination temperature. Calcination above 500°C induced also the transition of the metastable modification β‐NiMoO 4 to the stable form α, accompanied by a loss of conversion. A complex Bi molybdate with scheelitic structure was found to have a high selectivity to acrolein.