【摘要】 <正> BR型化学振荡反应目前研究很少。该反应机理大多参照BZ反应中较为公认的FKN机理。有些文献已作了报导以.二丙酮醇（CH₃）₂C（OH）CH₂C（O）CH₃（Diacetone alcohol,以下简称DA）为有机物,Ce³⁺为催化剂的BR型反应还未见报导。更多还原

【Abstract】 The oscillatary behavior of diacetone alcohol（DA）-KIO₃-H₂O₂-H₂SO₄-Ce³⁺ system has been studied.The system may oscillate in the concentration ranges of H₂SO₄ 0.11—0.24, KIO₃ 0.019—0.048; Ce³⁺ 5.95×10^-4—3.57×10^-3, DA 0.4—3.22 and H₂O₂ 0.40—1.99mol.dm^-3 respectively.Using Hg₂SO₄ electrode as the reference electrode, the potential of I^- and the redox potential show oscillatary wave behavior in XWT balance recorder.According to our expreimental results,We may said seen that the reaction is an autocatalytic reaction, in which HIO₂ plays an important role and IO₂^* is an intermediate. The final organic compound of the oscillatary reaction is iodo-DA, which cannot be further oxidized by Ce⁴⁺, this fact is different from that of BR system in which CH₂（COOH）₂ is oxidized to CO₂ as the final product. A mechanism has been suggested which can reasonably explain the behavior of this oscillating system.Studing the effects of different concentrations of components and temperature on the oscillatary induction period and oscillation period,the following kinetic eguations were obtained.in which f（[KIO₃]） and f（[H₂SO₄]）are coomplex functions of [KIO₃] and [H₂SO₄].The activation energy and activation entropy were calculated as followsThe negative value of ΔS_p^≠ coincides with the characteristic property of dissipative structure.更多还原