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Regeneration of the Oxidation Catalysts Based on the Aqueous Solutions of Non‐Keggin Mo‐V‐P Heteropoly Acids by Molecular Oxygen
Author(s) -
ZHIZHINA ELENA G.,
ODYAKOV VIKTOR F.
Publication year - 2014
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20858
Subject(s) - chemistry , catalysis , aqueous solution , homogeneous , kinetic energy , activation energy , oxygen , keggin structure , inorganic chemistry , redox , kinetics , organic chemistry , thermodynamics , physics , quantum mechanics
ABSTRACT Kinetic peculiarities of regeneration of the aqueous solutions of non‐Keggin‐type Mo‐V‐P heteropoly acids H a P z Mo y V x′ O b (HPA‐x′) and their acidic salts by O 2 are studied. The HPA‐ x ′ solutions have heightened thermal stability that permits to consider them as highly efficient catalysts for different oxidation processes. In the HPA‐ x ′ and their salts solutions, these peculiarities prove to be similar. The studied reaction is of the first order with respect to O 2 and V(IV), if [V(IV)] is higher than 0.8 M. As [V(IV)] decreases during the reaction, its order with respect to V(IV) increases to the third. The apparent activation energy of the reaction at temperatures 150–170°С is 37.5 kJ mol −1 . The obtained kinetic equation was used to calculate a new effective air reactor for the regeneration of the homogeneous HPA‐ x ′ catalyst in a pilot process of methylethylketone synthesis.