电场-磁性铁酸钴催化剂协同促进镁法脱硫产物氧化性能

Electric Field-Magnetic Cobalt Ferrite Catalyst Synergistically Promoted Oxidation of Magnesium Desulfurization Product

使用共沉淀法合成了负载型磁性铁酸钴(CoFe_(2)O_(4)/MCM-41)催化剂,利用廉价的石墨电极将电场引入MgSO_(3)催化氧化体系。通过XRD、SEM、TEM及HRTEM证明了CoFe_(2)O_(4)/MCM-41的成功合成与良好的分散性。电场通过促进SO_(3)^(2-)的直接氧化与自由基的生成将MgSO_(3)的氧化速率提升至无催化剂无电场条件下的10倍。对反应动力学的研究表明:最佳pH=8.0,反应相对于催化剂、MgSO_(3)的分级数分别为0.46、0,并得到反应的表观活化能为16.73kJ·mol^(-1),排除了内扩散与本征反应的影响。结合空气流量对反应的影响,发现反应速率受氧气的外扩散控制。

In this paper,supported magnetic cobalt ferrite(CoFe_(2)O_(4)/MCM-41)catalyst was synthesized by the co-precipitation method.A pair of budget graphite electrodes were used to introduce the electric field into MgSO_(3)catalytic oxidation system.XRD,SEM,TEM and HRTEM proved the successful synthesis and good dispersion of CoFe_(2)O_(4)/MCM-41.Under the effect of electric field,the oxidation rate of MgSO_(3)was 10times faster than under the condition of no catalyst and no electric field by promoting the direct oxidation of SO_(3)^(2-)and the formation of free radicals.The study of reaction kinetics showed that the optimal pH was 8.0.The reaction orders with respect to catalyst and MgSO_(3) were respectively 0.46and 0.And the apparent activation energy of the reaction was 16.73kJ·mol-1.Combined with the effect of air flow on the reaction,it is found that the reaction was controlled by the external diffusion of oxygen.The research results have positive effect on the promotion of magnesium flue gas desulfurization technology.