نوع مقاله : علمی و پژوهشی
عنوان مقاله English
نویسندگان English
Sulfur reduction in fuels is one of the most effective strategies for reducing sulfur oxide emissions to the atmosphere. Among the various methods, adsorption desulfurization is a suitable option for fuel purification due to its mild operating conditions and low cost. In this study, the effect of single and combined alkaline modification (NaOH and NaOH+TPAOH) on the physicochemical properties and adsorption performance of ZSM-5 zeolite in adsorption desulfurization of a model fuel with low sulfur concentration was investigated. The main goal was to create controlled mesopores in order to increase the capacity and rate of adsorption of sulfur compounds such as thiophene and dibenzothiophene. The results of XRD, FT-IR and BET tests showed that alkaline modification leads to the formation of a hierarchical structure without destroying the crystal framework of the zeolite. The use of the combined NaOH+TPAOH solution led to the creation of more uniform mesopores and an increase in the specific surface area from 324 to 368 m²/g. The desulfurization results showed that the NaOH+TPAOH modified sample exhibited the highest adsorption capacity for thiophene (15.3 mgS/g) and dibenzothiophene (6.7 mgS/g), which was significantly higher than that of the pure NaOH modified sample. This improvement was attributed to the expansion of mesopores and increased accessibility to internal active sites. The results indicate that the formation of uniform mesopore structures in ZSM-5 can significantly enhance the adsorption desulfurization efficiency even under mild operating conditions.
کلیدواژهها English
