不同孔结构硅胶负载强氧化性酸脱除柴油中硫化物的性能

选用不同孔结构的硅胶作为吸附剂，浓硝酸、过氧乙酸和次氯酸作为氧化剂，考察了硅胶孔结构对硅胶负载强氧化性酸脱除含4,6-二甲基二苯并噻吩150 μg/g的模型柴油中硫化物的影响，并通过红外光谱和N2等温吸附法对硅胶进行了表征。结果表明：对于过氧乙酸，硅胶孔结构对脱硫效果无明显的影响；对于分子直径较大的无机酸（次氯酸），硅胶孔径对脱硫率有较大的影响；对于分子直径较小的无机酸（浓硝酸），硅胶孔径和比表面积对脱硫率都有较大的影响。硫化物的氧化产物与硅胶孔结构无关。

EFFECT OF SILICA GEL PORE STUCTURE ON DIESEL DESULFURIZATION WITH STRONG OXIDATIVE ACIDS

Using concentrated nitric acid, peroxyacetic acid, hypochlorous acid as oxidant and silica-gel with different pore structures as adsorbent, the silica gel loaded with acid oxidant was prepared by mixing and characterized by IR and N2 adsorption-desorption. The effects of silica gel pore structure on desulfurization of model diesel with 1 000 μg/g of 4,6-dimethyldibenzothiophene（4,6-DMDBT）by strong oxidative acids were investigated. The results show that the pore structure of silica gel hardly relates to the desulfurization efficiency for peroxyacetic acid. However, the pore size of the silica gel has great influence on the S removal for hypochlorous acid with relative larger molecular size. Both pore diameter and inner specific surface area affect the desulfurization efficiency significantly for concentrated nitric acid. No relations of oxidative products and silica gel pore structure are observed.