采用溶胶-凝胶法制备出一种新型钛柱撑型光催化剂,并研究了它在模拟汽油体系中的光催化氧化深度脱硫性能。反应体系以氧气为氧化剂,自制光催化剂,紫外光激发,在正辛烷和乙腈两相中反应,硫化物被氧化为极性物质从正辛烷进入乙腈萃取相,从而达到深度脱硫的目的。采用 X 射线衍射、傅立叶变换红外光谱等对制备的催化剂进行了结构表征。对不同热处理条件下的催化剂催化性能、反应时间、催化剂用量以及剂油比等因素影响进行了考察。结果表明:经350℃热处理的催化剂具有较好的光催化性能,6小时内,可将模拟物系中的硫含量由400μg/g 降到30μg/g。
The corrosion process of tinplate in 0.5 mol/L NaCl solution was investigated using the electrochemical impedance spectroscopy（EIS）,and the morphology and structure of the corrosion products were characterized by scanning electron microscope（SEM）,scanning probe microscopy（SPM）,X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS）.The results showed that the resistance of tin coating,Rc,was essentially constant but the charge transfer resistance,Rct,decreased by 2 orders of magnitude,which indicated that the tin coating was not seriously corroded while the carbon steel substrate was corroded continuously.The corrosion of tinplate in 0.5 mol/L NaCl solution was mainly the dissolution of carbon steel substrate because of the defects in the tin layer and the corrosion product was mainly γ-FeOOH.
