The role of Ce(III) in BZ oscillating reactions

Author(s)

Nogueira, Paulo A. ^[1] ; Varela, Hamilton ^{[1, 2]} ; Faria, Roberto B. ^[3]

Affiliation

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] GIST, Ertl Ctr Electrochem & Catalysis, Kwangju 500712 - South Korea

^[3] Univ Fed Rio de Janeiro, Inst Quim, BR-21941909 Rio De Janeiro, RJ - Brazil

• Document type: Journal article
• Source: Chemical Physics Letters; v. 530, p. 137-139, MAR 19 2012.
• Web of Science Citations: 11

Abstract

Herein we present results on the oscillatory dynamics in the bromate-oxalic acid-acetone-Ce(III)/Ce(IV) system in batch and also in a CSTR. We show that Ce(III) is the necessary reactant to allow the emergence of oscillations. In batch, oscillations occur with Ce(III) and also with Ce(IV), but no induction period is observed with Ce(III). In a CSTR, no oscillations were found using a freshly prepared Ce(IV), but only when the cerium-containing solution was aged, allowing partial conversion of Ce(IV) to Ce(III) by reaction with acetone. (C) 2012 Elsevier B. V. All rights reserved. (AU)

• FAPESP's process: 09/07629-6 - Electrocatalysis IV: fundamental and applied aspects of electrocatalytic processes, bio-electrocatalysis and kinetic instabilities
• Grantee: Edson Antonio Ticianelli
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants