关键词: CuHY分子筛吸附剂, 二苯并噻吩(DBT), 吸附脱硫

Abstract: The CuHY zeolites’ absorbents with different Cu loadings were prepared via isovolumic impregnation method, and characterized via X-ray diffraction(XRD), BET surface area measurement and NH₃ tempe-rature-programmed desorption(NH₃-TPD) techniques. The CuHY zeolites absorbents’ performance of desulfurization was investigated in the model diseles containing dibenzothiophene(DBT). The crystalline structure of Cu8HY zeolite and the Cu²⁺ cations distribution in the cages of the Y zeolite was determined via powder XRD with Rietveld method. The results show that the frameworks of the Y zeolites were retained after Cu²⁺ cations entered the cages of the Y zeolites, the amounts of strong acid sites increased slightly and the amounts of mid-strong acid sites decreased slightly in the CuHY zeolite. At the same time, one part of Cu²⁺ cations entering the cages of Y zeolite, and situated at the sites S_I' in the β cages, while another part of Cu²⁺ cations situated at sites S_Ⅲ in the supercages and coordinated with water molecules in the supercages. The Cu²⁺ cations situating at sites S_Ⅲ in the supercages can adsorb DBT molecules in the model diseles and become the centers of desulfurization. However, naphthalene molecules will resulting the competitive adsorption with DBT molecules if there are naphthalene molecules in the model diseles.

Key words: CuHY zeolites’ absorbent, Dibenzothiophene(DBT), Desulfurization