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

Química Nova

Universidade de São Paulo, São Carlos, Brasil¹  Oliveira, Hyrla C. L.¹  Varela, Hamilton¹  Oliveira, Tatiane B.¹ 

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 this work the influence of temperature on the dynamics of homogeneous chemical systems containing 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/acid and bromate/1,4-CHD/trisbipyridine ruthenium/acid. Investigations were carried out by means of an electrochemical probe, at five temperatures between 5 and 45 °C. Activation energies (Ea) were estimated in different ways for the pre-oscillatory and oscillatory regimes. In any case, the Ea was found to depend on the catalyst, composition and initial concentrations. In addition, it was observed that ferroin and trisbipyridine ruthenium act as catalysts only during the transition between the induction period and oscillatory regime.

【 授权许可】

Unknown