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汽油中不同硫化物在Ce(IV)Y分子筛上的选择性吸附

THE SELECTIVE ADSORPTION OF DIFFERENT SULFUR COMPOUNDS IN GASOLINE ON Ce(Ⅳ)Y ZEOLITE
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摘要 考察液相离子交换法制备的Ce(Ⅳ)Y分子筛对催化裂化汽油(FCC)(S质量分数为106μg/g)和模拟油(S质量分数为500μg/g)中不同硫化物的选择性吸附性能。通过SCD(硫发光检测器)气相色谱检测出催化裂化汽油主要含噻吩(T)、2-甲基噻吩(2-MT)、3-甲基噻吩(3-MT)、四氢噻吩(THT)等硫化物。固定床穿透试验结果表明,Ce(Ⅳ)Y分子筛选择性吸附催化裂化汽油中的硫化物时,对不同硫化物的吸附能力不同,其中最容易吸附的是THT。模拟油脱硫试验结果表明,不同硫化物在Ce(Ⅳ)Y分子筛上的吸附容量存在明显差异。按穿透吸附容量排列的硫化物顺序为THT〉3-MT〉T〉2-MT,对应的穿透吸附容量分别为13.8、6.3、6.0和4.8mg/g。为了进-步研究不同硫化物在Ce(Ⅳ)Y分子筛的吸附行为,运用密度泛函理论分子模拟计算了不同硫化物上的硫原子电子密度,计算结果和试验值相吻合。 Ce(Ⅳ)Y zeolite prepared by liquid phase ion exchange was studied for desulfurization of FCC gasoline(S fraction 106 μg/g) and model gasoline(S fraction 500 μg/g). The major refractory sulfur compounds of FCC gasoline were fully characterized by the latest generation of SCD detectors in our laboratory, which are capable of distinguishing different sulfides, including thiophene(T), 2-methyl thiophene (2-MT), 3-methyl thiophene(3-MT), tetrahydrothiophene(THT). The selective adsorption capacity of Ce(Ⅳ)Y zeolite for different sulfur compounds was also studied, which was found to follow the order of THT 〉 3-MT 〉 T 〉 2-MT, their corresponding breakthrough capacities were 13.8, 6.3, 6.0 and 4.8 mg/g, respectively. This trend was correlated to the electron density on sulfur atoms derived from computer-aided molecular orbital calculations.
出处 《石油学报(石油加工)》 EI CAS CSCD 北大核心 2008年第B10期84-87,101,共5页 Acta Petrolei Sinica(Petroleum Processing Section)
基金 国家自然基金项目(20476042和20776064)和国家重点基础研究发展计划“973”项目(2007CB216403)资助
关键词 分子筛 选择性吸附 脱硫 密度泛函理论 zeolite selective adsorptive desulfurization DEF
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参考文献12

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