关键词: 碳化硼氮, 金属掺杂, 高比表面积, 吸附脱硫, 柴油 

Abstract: Novel mesoporous carbon and metal-doped boron nitride materials (CBN and M-CBN) were prepared by using melamine and boric acid as raw materials Multiple techniques, such as N2 adsorption-desorption, SEM, XRD and NH3-TPD, were applied to characterize the textural, morphology, acid properties and adsorptive desulfurization performance, respectively. The correlation between calcination temperature and the BET specific surface area of CBN was also investigated. The results show that when the calcination temperature is 890℃, the BET specific surface area of CBN reaches 1368 m2/g, at the same time its pore diameter intensively ranges from 3 to10 nm. Both CBN and M-CBN show a steplike shape with sharp edge in morphology. Sulfur compounds adsorption in CBN is an exothermal and spontaneous process. When adsorption temperature is 15℃, the CBN shows the best adsorption performance. The carbon and metaldoped boron nitride (M-CBN) displays a significantly higher amount of acid sites and exhibits enhanced adsorption performance for sulfur compounds in hydrogenated diesel than pure carbondoped boron nitride (CBN). In addition, it is the first time that a carbon and metaldoped mesoporous boron nitride are applied to adsorptive desulfurization. The addition of Ag to CBN with a mass fraction of 1.25% reduces the sulfur content in State V diesel to less than 1 μg/g. Ag-CBN is well regenerated by washing with toluene and heat treatment in nitrogen. The regenerated adsorbent still shows a good adsorption capacity after four regeneration cycles.

Key words: carbon-doped boron nitride, metal doping, high specific surface area, adsorptive desulfurization, diesel