电场-磁性铁酸钴催化剂协同促进镁法脱硫产物氧化性能

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文章编号： 1672-6987（2022）02-0039-07； DOI： 10.16351/j.1672-6987.2022.02.006

车宜行， 杜瑾， 田红景*（青岛科技大学 化工学院，山东 青岛 266042）

摘要： 使用共沉淀法合成了负载型磁性铁酸钴(CoFe2O4/MCM-41)催化剂，利用廉价的石墨电极将电场引入MgSO3催化氧化体系。通过XRD、SEM、TEM及HRTEM证明了CoFe2O4/MCM-41的成功合成与良好的分散性。电场通过促进SO2-3的直接氧化与自由基的生成将MgSO3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、MgSO3的分级数分别为046、0，并得到反应的表观活化能为1673 kJ·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。

关键词： 亚硫酸镁； 磁性铁酸钴； 电场； 反应动力学

中图分类号： X 705文献标志码： A

引用格式： 车宜行， 杜瑾， 田红景. 电场-磁性铁酸钴催化剂协同促进镁法脱硫产物氧化性能［J］. 青岛科技大学学报(自然科学版), 2022, 43(2): 39-45.

CHE Yixing, DU Jin, TIAN Hongjing. Electric field-magnetic cobalt ferrite catalyst synergistically promoted oxidation of magnesium desulfurization product［J］. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2022， 43（2）： 39-45.

Electric Field-Magnetic Cobalt Ferrite Catalyst Synergistically Promoted

Oxidation of Magnesium Desulfurization Product

CHE Yixing, DU Jin, TIAN Hongjing

(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: In this paper, supported magnetic cobalt ferrite (CoFe2O4/MCM-41) catalyst was synthesized by the co-precipitation method. A pair of budget graphite electrodes were used to introduce the electric field into MgSO3 catalytic oxidation system. XRD, SEM, TEM and HRTEM proved the successful synthesis and good dispersion of CoFe2O4/MCM-41. Under the effect of electric field, the oxidation rate of MgSO3 was 10 times faster than under the condition of no catalyst and no electric field by promoting the direct oxidation of SO2-3 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 MgSO3 were respectively 046 and 0. And the apparent activation energy of the reaction was 1673 kJ·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.

Key words: magnesium sulfite; magnetic cobalt ferrite; electric field; kinetics

收稿日期： 2021-03-24

基金项目： 国家自然科学基金项目(51106077)；山东省生态化工协同创新中心人才基金项目(XTCXQN22)；煤炭高效利用与绿色化工国家重点实验室开放课题重点项目(2020-KF-02).

作者简介： 车宜行(1996—),男,硕士研究生.*通信联系人.