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Kinetics of 2,2,6,6‐Tetramethylpiperidine Oxidation over Sn 2+ on Ion Exchange Resin
Author(s) -
Guo L.,
Chen K.,
Tian H.
Publication year - 2001
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/1521-4125(200102)24:2<181::aid-ceat181>3.0.co;2-k
Subject(s) - hydrogen peroxide , chemistry , catalysis , sn2 reaction , decomposition , ion exchange resin , tungstate , kinetics , batch reactor , reaction rate constant , radical , inorganic chemistry , atmospheric temperature range , ion exchange , redox , nuclear chemistry , ion , organic chemistry , thermodynamics , physics , quantum mechanics
The oxidation of 2,2,6,6‐tetramethylpiperidine (TEMP) over Sn 2+ on ion exchange resin is carried out in a batch reactor. The influence of the reactant concentrations, reaction temperature and catalyst amount is investigated. Within the temperature range studied, 303–323 K, the reaction follows the second order kinetic equation ‐r TEMP = kC TEMP C H2O2 , with reaction rate constant k = 2.2 × 10 7 exp (‐51200/RT) L/mol h. We propose a reaction mechanism different from that for catalyzation by tungstate. The catalyst likely forms complexes with hydroxyl radicals, keeping their concentration steady. At the same time, the catalyst also decreases the decomposition of hydrogen peroxide caused by high temperatures and the reactant 2,2,6,6‐tetramethylpiperidine itself.