Co-Mo-B/MCM-41催化剂对亚硫酸镁的催化氧化  

Catalytic Oxidation of Magnesium Sulfite Over Co-Mo-B/MCM-41 Catalysts

作　　者：徐嘉宁 昌晶[1] XU Jianing;CHANG Jing(College of Recourse and Environment,Qingdao Agricultural University,Qingdao 266109,China)

机构地区：[1]青岛农业大学资源与环境学院,山东青岛266109

出　　处：《青岛科技大学学报（自然科学版）》2022年第5期29-35,共7页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：山东省高校科技计划项目(J18KA085)。

摘　　要：采用浸渍-还原法合成了非晶态Co-Mo-B/MCM-41催化剂,应用于亚硫酸镁(MgSO_(3))催化氧化体系。运用扫描电子显微镜(SEM)和X射线衍射(XRD)等分析手段对催化剂的形貌结构进行表征。在曝气条件下研究了Co-Mo-B/MCM-41催化剂的MgSO_(3)催化氧化性能及机理,结果表明:在n(Co)/n(Mo)=7/1,pH=8,T=318 K,空气流量为60 L·h,MgSO_(3)加入量为50 g·L^(-1),催化剂浓度为1 g·L^(-1)的反应条件下,MgSO_(3)氧化速率达到0.107 9 mmol·(L·s)^(-1)。通过自由基猝灭实验和电子顺磁共振(EPR)测试表明提高氧化速率的主要原因是催化氧化过程中产生的具有高活性的O_(2)·^(-)。The amorphous Co-Mo-B/MCM-41 catalysts have been prepared by impregnation-reduction method for catalytic oxidation of MgSO_(3). The catalysts were characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD). Under aeration conditions, the performance and mechanism of MgSO_(3)oxidation over Co-Mo-B/MCM-41 catalysts ware studied. When n(Co)/n(Mo)=7/1, pH=8, T=318 K, air flow rate is 60 L·min, MgSO_(3)dosage is 50 g·L^(-1), and catalyst concentration is 1 g·L^(-1), the oxidation rate of MgSO_(3)was 0.107 9 mmol·(L·s)^(-1). The main reason for increasing the oxidation rate is the highly active superoxide radicals produced during the catalytic oxidation process by radical quenching experiments and electron paramagnetic resonance(EPR) techniques.

关 键 词：亚硫酸镁 Co-Mo-B 催化氧化 

分 类 号：TB383[一般工业技术—材料科学与工程]