USY分子筛催化FCC汽油的烷基化脱硫反应研究

The Study on Alkylation Reaction of Thiophenic Compounds for Desulfurization of FCC Naphtha over USY Zeolite Catalysts

以USY分子筛催化FCC汽油中噻吩类硫化物与烯烃的烷基化反应,采用DL-2B-EE微库仑仪测定反应前后硫分布的变化,考察了USY分子筛的制备条件和烷基化反应温度对其催化性能的影响.实验结果表明,水蒸汽处理温度350℃、水蒸汽处理时间5h,反应温度120℃时,USY分子筛催化剂的比表面积为613m2/g,催化活性最佳,使得FCC汽油中<100℃馏分的硫含量减少至16.92mg/L.水蒸汽流速对USY分子筛催化烷基化反应影响不大.不同处理方法所得USY分子筛的吡啶吸附红外光谱结果表明,具有较多的酸中心的USY分子筛更有利于催化FCC汽油的烷基化脱硫反应.

Alkylation reactions of thiophenic compounds with olefin contained in FCC naphtha on USY zeolite catalyst were investigated. The sulfur content had been detected by means of DL-2B-EE mierocoulometer. Effects of different reaction temperature and USY steaming treatment on alkylation performance were discussed. The results showed that the sulfur content in 〈 100℃ proportion can decrease to 16.92 mg/L,when the conditions were as follows： the steaming temperature 350℃, the steaming time 5 h, reaction temperature 120 ℃. The surface area of this USY zeolite catalyst had reached 613 m^2/g, Effect of the different steaming velocity could be neglected. The results of the pyridine adsorption infra-red spectrogram suggested that USY zeolite with larger acid sites performed better on the alkylation reactions.