MOF-505对二苯并噻吩的高效催化氧化脱硫

Highly efficient catalytic oxidation desulfurization of dibenzothiophene by MOF-505

摘要:

采用溶剂热法制备了铜基金属有机框架材料MOF-505，将其应用于萃取氧化脱硫体系。通过XRD、FTIR、SEM、XPS和氮气吸附-脱附等方法表征其结构和稳定性，考察MOF-505对二苯并噻吩（DBT）等模拟油的催化脱硫效果，利用HPLC监测含硫量。结果表明，最优条件为DBT模拟油体积和乙腈萃取剂体积均为5 mL，反应温度为90℃，过氧化氢用量为200 μL，反应时间为60 min，催化剂MOF-505用量为25 mg，MOF-505对DBT的催化脱硫率高达95.50%，对其同系物苯并噻吩（BT）和4,6-二甲基苯并噻吩（4,6-DMDBT）的脱硫率也分别达到66.88%和78.93%。经6次催化脱硫循环后，MOF-505对DBT模拟油的催化脱硫率保持在91%以上，具有良好的循环利用性。

Abstract:

A copper-based metal-organic framework, MOF-505, was prepared by solvent-thermal synthesis method, and selected to be used in the extraction oxidation desulfurization system. Its structure and stability were characterized by XRD, FTIR, SEM, XPS and nitrogen adsorption-desorption techniques. The catalytic desulfurization of the simulated oil containing sulfides such as dibenzothiophene (DBT) was investigated, and the sulfur content of was monitored by HPLC. As a result, the optimal conditions were as follows: the volume of DBT simulated oil was 5 mL, the volume of acetonitrile extractant was 5 mL, the volume of hydrogen peroxide was 200 μL, the amount of MOF-505 catalyst was 25 mg, the reaction time was 60 min at 90℃. And the desulfurization rate was up to 95.50% for DBT, 66.88% for benzothiophene (BT) and 78.93% for 4,6-dimethyldibenzothiophene (4,6-DMDBT). After 6 catalytic desulfurization cycles, the catalytic desulfurization rate of MOF-505 for DBT simulated oil remained above 91%, indicating excellent recyclability.