核黄素光敏氧化噻吩脱硫研究

以噻吩的正辛烷溶液模拟FCC汽油，以水为萃取剂，以空气中的O2为氧化剂，以核黄素为光敏剂，研究了噻吩在500W高压汞灯照射下的光化学氧化。实验结果表明，在通气量为150mL/min、水油比为1∶1、核黄素加入量为30μmol/L的条件下，反应3h后噻吩的脱硫率能够达到85.4%。核黄素的敏化作用是通过激发基态氧为单线态氧实现的，噻吩氧化脱硫为一级动力学反应，加入光敏剂时反应速率常数k=9.10×10-5s-1，半衰期t1/2＝2.12h。

Photosensitized oxidative desulfurization of thiophene by riboflavin

Photosensitized oxidative desulfurization of thiophene in n octane/water extraction system was studied with riboflavin as photosensitizer and O2 in air as oxidant. A 500W high pressure Hg lamp was used as the light source for irradiation and air was introduced by a gas pump for supplying O2. The desulfurization yield of thiophene was 85.4% for a 3h photoirradiation under the conditions with the air flow at 150mL/min, water/oil ratio at 1∶1 and riboflavin concentration at 30μmol/L. The mechanism of photosensitized oxidative of thiophene is 1O2 exited from 3O2 by the addition of riboflavin. Under the above conditions, the photooxidation kinetics of thiophene with O2/ riboflavin is first order with a rate constant of 9.10×10-5s-1 and half time of 2.12h.