Oscillatory dynamics in systems containing bromate and 1,4-cyclohexanedione in acidic media: I. The effect of temperature

Quimica nova

Oliveira, Hyrla C. L.¹  Varela, Hamilton¹  Oliveira, Tatiane B.¹ 

[1] Universidade de São Paulo, São Carlos, Brasil

关键词: oscillations;    complex kinetics;    1;    4-cyclohexanedione.;   

DOI  :  10.1590/S0100-40422012000200022

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

We present in thiswork the influence of temperature on the dynamics of homogeneous chemical systemscontaining bromate and 1,4-cyclohexanedione (1,4-CHD) in acidic media. In particular,the following systems were studied: bromate/1,4-CHD/acid, bromate/1,4-CHD/ferroin/acidand bromate/1,4-CHD/trisbipyridine ruthenium/acid. Investigations were carriedout by means of an electrochemical probe, at five temperatures between 5 and45 °C. Activation energies (Ea) were estimated in differentways for the pre-oscillatory and oscillatory regimes. In any case, the Eawas found to depend on the catalyst, composition and initial concentrations.In addition, it was observed that ferroin and trisbipyridine ruthenium act ascatalysts only during the transition between the induction period and oscillatoryregime.

【 授权许可】

CC BY