DECOMPOSITION OF PERACETIC-ACID CATALYZED BY COBALT(II) AND VANADIUM(V)

Citation
Xz. Zhang et al., DECOMPOSITION OF PERACETIC-ACID CATALYZED BY COBALT(II) AND VANADIUM(V), Canadian journal of chemistry, 76(7), 1998, pp. 1064-1069
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry
Journal title
ISSN journal
0008-4042
Volume
76
Issue
7
Year of publication
1998
Pages
1064 - 1069
Database
ISI
SICI code
0008-4042(1998)76:7<1064:DOPCBC>2.0.ZU;2-Q
Abstract
Peracetic acid (Pa) is now being used for totally chlorine-free delign ification and bleaching of wood pulps. During the process, metals deso rb from the pulp fibers into the aqueous solution. Of the relevant met als in bleaching systems, cobalt(II) and vanadium(V) are the most pote nt in wastefully decomposing Pa to O-2 In the present study, radical s cavenging by N,N-(5-nitro-1,3-phenylene)-bisglutaramide (GAMID) indica tes that free-radical mechanisms are operative. Kinetic data support a free-radical decomposition mechanism previously described for Co(II). A similar type of mechanism, involving VO(ON)(2(aq)) and VO(OH)(3(aq) ), is postulated to partially explain catalysis by vanadium.