Department of Environmental Science, University of Kuopio, FI-70211 KY, Finland.
Ultrason Sonochem. 2010 Mar;17(3):541-6. doi: 10.1016/j.ultsonch.2009.10.011. Epub 2009 Oct 27.
The kinetic study of silent and ultrasound-assisted catalytic wet peroxide oxidation of phenol in water was performed to qualitatively assess the effect of ultrasound on the process kinetics. Various kinetic parameters such as the apparent kinetic rate constants, the surface utilization coefficient and activation energy of phenol oxidation over RuI(3) catalyst were investigated. Comparative analysis revealed that the use of ultrasound irradiation reduced the energy barrier of the reaction but had no impact on the reaction pathway. The activation energy for the oxidation of phenol over RuI(3) catalyst in the presence of ultrasound was found to be 13kJmol(-1), which was four times smaller in comparison to the silent oxidation process (57kJmol(-1)). Finally, 'figures-of-merit' was utilized to assess different experimental strategies such as sonolysis alone, H(2)O(2)-enhanced sonolysis and sono-catalytic oxidation of phenol in order to estimate the electric energy consumption based on the kinetic rate constants of the oxidation process.
进行了无声和超声辅助催化湿式过氧化氢氧化苯酚的动力学研究，以定性评估超声对过程动力学的影响。研究了各种动力学参数，如表观动力学速率常数、RuI(3)催化剂上苯酚氧化的表面利用系数和活化能。对比分析表明，超声辐射的使用降低了反应的能垒，但对反应途径没有影响。在超声存在下，RuI(3)催化剂上苯酚氧化的活化能为 13kJmol(-1)，与无声氧化过程(57kJmol(-1))相比，减小了四倍。最后，利用“优值”来评估不同的实验策略，如单独的超声分解、H(2)O(2)增强的超声分解和苯酚的声催化氧化，以便根据氧化过程的动力学速率常数估算基于电能消耗。
