关键词: 杂多化合物, 中空SiO₂, 氧化脱硫, 硫化物, 过氧化氢

Abstract:

Hollow SiO₂ was prepared by dispersion aggragation before uploading HPW. The prepared catalyst was characterized by N₂ adsorption-desorption, FTIR, XRD and SEM. The method of catalytic extraction fuel ultra-deep desulfurization was developed using hydrogen peroxide as oxidant and MeCN as extractants. The effects of catalyst dosage, O/S molar ratio, pre-immersion time of the catalyst in H₂O₂ solution, reaction temperature and initial sulfur content were investigated. Under the favourable operating conditions recommended as follows: mass ratio of catalyst dosage and simulated diesel of 1.0%, O/S molar ratio of 15, pre-immersion time of the catalyst in H₂O₂ solution being 4 min, temperature of 60 ℃ and initial sulfur content of 350 mg/L, the sulfur content of simulated diesel can be reduced from 350 mg/L to 2.45 mg/L, with a desulfurization efficiency of 99.3% at 180 min. The overal desulfurization efficiency reaches 99.3%, higher than that by mere extraction by 45.1%, efficiency significantly. Moreover, NH₄PW-SiO₂ for real gasoline and diesel catalytic oxidative desulfurization was obtained with good effect and the catalyst recovered demonstrates almost the same activity as the fresh after 5 recycles.

Key words: Heteropoly compound, Hollow SiO₂, Oxidative desulfurization, Organic sulfur, Hydrogen peroxide