AgHY分子筛的吸附脱硫性能

Performance of Adsorptive Desulfurization over Modified AgHY Zeolites

以等体积浸渍法制备不同负载量的AgHY分子筛,利用物理吸附仪和X射线衍射(XRD)技术对分子筛吸附剂进行表征.BET结果表明改性分子筛的比表面积和孔容随Ag的负载量的增加而降低,XRD图谱的变化表明,银的负载仅降低了衍射峰强度,而对HY的骨架结构没有影响,并且也没有Ag2O的特征峰出现.在静态吸附条件下考察了改性AgHY分子筛吸附剂对二苯并噻吩(DBT)的脱除性能.结果表明,Ag改性的HY分子筛具有较好的吸附脱硫性能和再生性能.应用Ag负载量为10%的Ag10HY吸附剂,在吸附时间2 h、吸附温度60℃的条件下,二苯并噻吩的脱除率可达90%,硫含量由最初的330μg·g-1降至33μg·g-1.吸附后的Ag10HY吸附剂在温度400℃、空气介质中再生后,吸附脱除效果仍可达到89.4%.

The AgHY zeolite absorbents with different Ag loadings are prepared by incipient-wetness impregnation.The physical adsorption analyzer and the X-ray diffraction are employed to characterize these absorbents.The BET results show that the surface areas and pore volumes of AgHY zeolites decrease with an increase in Ag loading.The introduction of Ag lowers the intensities of the XRD peaks of HY zeolite without changing basic framework.None of Ag2O peaks appears in the XRD patterns of AgHY zeolites.The removal capability of Ag-modified HY zeolites to dibenzothiophene is investigated by static adsorption.Good performance in dibenzothiophene removal and regeneration is found.90% DBT can be removed by the Ag10HY（Ag loading： 10 wt %） at 60 ℃ in 2 h.The sulfur content decrease from 330 μg.g-1 to 33 μg.g-1.Removal 0f 89.4 % DBT still can be reached by the used Ag10HY after being calcined at 400℃ in air.