三维有序大孔HPW/Al_(2)O_(3)催化剂制备及其催化氧化脱硫性能

Synthesis and catalytic oxidation desulfurization performance of 3DOM HPW/Al_(2)O_(3)

以新制备的聚苯乙烯(PS)为胶晶模板,合成大孔直径约250nm的三维有序大孔磷钨酸/Al_(2)O_(3)(3DOM HPW/Al_(2)O_(3))催化剂。采用扫描电镜(SEM)、透射电镜(TEM)、N_(2)吸附-脱附、X射线衍射仪(XRD)和红外光谱仪(FT-IR)研究其结构,并评价其催化氧化性能。结果表明:该催化剂大孔(250nm)相互连通,Keggin结构的HPW分子均匀分布在Al_(2)O_(3)大孔框架结构中。其催化氧化性能在60℃条件下3h可将模拟燃油中98.5%的二苯并噻吩氧化成相应的砜,回收循环性能优秀,回收循环使用12次性能仅下降3%。

Using prepared polystyrene(PS) as colloidal crystal template,three-dimensional ordered macroporous(3 DOM) phosphotungstic acid(HPW)/Al_(2)O_(3) catalyst with macropore diameter of 250 nm was synthesized.Its structure was characterized by scanning electron microscope(SEM),transmission electron microscope(TEM),N_(2) adsorption-desorption isotherms,XRD and FT-IR.Its catalytic oxidation performance was evaluated.The results shown that the macropores(250 nm) of the catalyst were interconnected and the HPW molecules with Keggin structure was uniformly distributed in the Al_(2)O_(3) macroporous frame structure.It can oxidize 98.5% dibenzothiophene of the simulated fuel to sulfone in 3 hours at 60℃,and the catalytic oxidation performance was basically unchanged after 6 times recycling,while the performance of the recovery cycle decreased by only 3% for 12 times.