摘要
以原位晶化NaY型分子筛为载体,选择铬、锰、钴三种过渡金属离子,通过液相离子交换法制备了CrNaY,MnNaY,CoNaY三种改性分子筛吸附剂。采用静态吸附脱硫法对这三种吸附剂的脱硫性能进行评价。实验结果表明,CrNaY对含噻吩和2-甲基噻吩的模型汽油的脱硫效果最好,且对2-甲基噻吩的脱除率大于噻吩脱除率。在93℃、吸附时间为1h、剂油比为0.5的条件下, CrNaY对噻吩的脱除率为70.03%。此外,采用非水溶液回滴法对三种吸附剂的表面总酸度进行测定,结果显示CrNaY的总酸度最大,而其脱硫效果也最好,表明随着吸附剂总酸度的增强,其脱硫性能也增强。
Three adsorbents（CrNaY, MnNaY,CoNaY）were prepared by ion-exchange technique to introduce various transition metal ions（Cr^3＋ , Mn^2＋ and Co^2＋ ）into in-situ synthesized NaY zeolite. The desulfurization behaviors of these adsorbents were investigated using model gasoline containing thiophene or 2-methyl thiophene. The results showed that CrNaY exhibited the best sulfur removal performance,and the removal rate of 2-methyl thiophene was higher than that of thiophene. Under the condition of 93 ℃ ,an adsorption time of 1 h and a mass ratio of adsorbent to oil of 0.5 ,the removal rate of thiophene over CrNaY reached 70. 03%. The surface acidities of adsorbents were determined by nonaqueous solution back titration method, and the results showed that the total acidity of CrNaY was the highest, which indicated that the sulfur removal rate increased with the increase of adsorbent acidity.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2009年第2期41-44,共4页
Petroleum Processing and Petrochemicals
关键词
脱硫
吸附
分子筛
改性
原位晶化
desulfurization
adsorption
zeolite
modification
in-situ crystallization
