Kinetics of 2,2,6,6-tetramethylpiperidine oxidation over Sn2+ on ion exchange resin

Citation
L. Guo et al., Kinetics of 2,2,6,6-tetramethylpiperidine oxidation over Sn2+ on ion exchange resin, CHEM ENG TE, 24(2), 2001, pp. 181-184
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemical Engineering
Journal title
CHEMICAL ENGINEERING & TECHNOLOGY
ISSN journal
0930-7516 → ACNP
Volume
24
Issue
2
Year of publication
2001
Pages
181 - 184
Database
ISI
SICI code
0930-7516(200102)24:2<181:KO2OOS>2.0.ZU;2-A
Abstract
The oxidation of 2,2,6,6-tetramethylpiperidine (TEMP) over Sn2+ on ion exch ange 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 s econd order kinetic equation -r(TEMP) = kC(TEMP)C(H2O2), With reaction rate constant k = 2.2 x 10(7)exp (-51200/RT) L/mol h. We propose a reaction mec hanism different from that for catalyzation by tungstate. The catalyst like ly forms complexes with hydroxyl radicals, keeping their concentration stea dy. At the same time, the catalyst also decreases the decomposition of hydr ogen peroxide caused by high temperatures and the reactant 2,2,6,6-tetramet hylpiperidine itself.