改性Y型分子筛对FCC汽油脱硫效果的研究

采用二次离子交换法将NaY分子筛与硝酸铈溶液加热到100℃持续进行搅拌交换4 h，制成CeY分子筛，然后在不同条件下用NaY，Ce(Ⅲ)Y，Ce（Ⅳ）Y 分子筛对催化裂化汽油进行吸附脱硫实验，利用微库仑综合分析仪对处理过的FCC汽油样品进行硫含量测定。静态吸附脱硫实验结果表明，在吸附时间为4 h、室温（20℃）、剂油比为1﹕2、转速为40r/min的条件下，分子筛的吸附脱硫效果最佳，其中Ce（Ⅳ）Y分子筛的吸附脱硫效果最好。动态吸附脱硫实验结果表明，当体积空速为5.0 h-1时， Ce(Ⅳ)Y分子筛吸附容量较大，为0.46 mg(S)/g吸附剂。

STUDY ON THE SELECTIVE ADSORPTIVE DESULFURIZATION OF FCC NAPHTHA BY MODIFIED ZEOLITE Y

Ce modified zeolite Y samples were prepared by ion-exchange method. Tests of selective adsorptive desulfurization of FCC naphtha by NaY, Ce(Ⅲ)Y and Ce(Ⅳ)Y were conducted under various conditions, and the sulfur contents of the treated naphtha samples were analyzed by microcoulometry. Under the optimal static adsorptive desulfurization conditions of an adsorption time of 4h, at ambient temperature (20℃), an adsorber to oil mass ratio of 0.5 and a stirring speed of 40 r/min, Ce(Ⅳ)Y exhibited the best desulfurization performance. Test results of kinetic adsorptive desulfurization showed with a liquid hourly space velocity of 5.0 h-1, the adsorption capacity of Ce(Ⅳ)Y reached 0.46 mg/g.