AgY吸附剂的吸附脱硫性能及竞争吸附研究

Performance of Adsorptive Desulfurization and Competitive Adsorption over AgY Zeolites

以NaY分子筛为载体,通过液相离子交换法制备了Ag改性的AgY分子筛,并对其进行了X射线衍射(XRD),原子吸收光谱(AAS)、N_2吸附比表面积(BET)、X射线光电子能谱(XPS)和扫描电镜(SEM)等表征分析。以噻吩/石油醚体系为模型化合物,考察了吸附温度、吸附时间等吸附条件对吸附剂吸附性能的影响,结果表明吸附温度40℃,吸附时间30 min时脱硫效果最好。40℃时,AgY吸附剂的静态平衡吸附量为0 852 3 rnmol/g。考察了含氮化合物和芳香族化合物竞争吸附对模拟油的脱硫率的影响,实验结果表明,随着含氮化合物或芳香族化合物的质量分数的增大,模拟油体系的脱硫率显著降低,并且其影响强弱顺序为吡啶>喹啉,乙苯>甲苯>苯,且氮化物的影响比芳香烃化合物的影响更大。

Ag doped AgY zeolite adsorbents were prepared by introducing silver into the framework of NaY zeolite with liquid ion exchange. The adsorbents were characterized by the X-ray diffraction （XRD）, atomic absorption spectroscopy （AAS）, N2-adsorption specific surface area measurements （BET）, X-ray photoelectron spectroscopy （XPS） and scanning electron microscope （SEM）. Effects of adsorption temperature and adsorption time on desulfurization of the model fuel which contained thiophene in petroleumether were investigated. The results demonstrated that the better adsorption technology was adsorption temperature 40 ℃ and adsorption time 30 min. The equilibrium adsorption capacity was 0.852 3 mmol/g at 40℃. The competition absorptive effects of nitrogen compounds and aromatic compounds on absorptive desulfurization were investigated. The desulfurization ratio reduced significantly with the increase of mass fraction of nitrogen compounds or aromatic compounds, the influences followed the order： pyridine 〉 quinolone, ethylbenzene 〉 methylbenzene 〉 benzene. The nitrogen compounds have more influence on absorptive desulfurization than aromatic compounds.