摘要
以溶胶-凝胶法制备了TiO2-NaY(TY)分子筛载体,采用浸渍法制备了Ag/TiO2-NaY(AgTY)吸附剂,并用X射线衍射、傅里叶变换红外光谱和X射线光电子能谱技术对吸附剂进行了表征。在固定床吸附床上考察了含氮化合物和芳香族化合物对AgTY选择性吸附噻吩(TP)和苯并噻吩(BT)性能的影响,并研究了其吸附机理。结果表明,AgTY吸附剂中TiO2主要以锐钛矿型存在,与NaY相比,TY分子筛的骨架结构并未发生明显的改变;在吸附温度50℃时,AgTY吸附剂对噻吩、苯并噻吩的穿透硫容分别为0.45%和0.63%;对噻吩模拟油,吡啶对吸附脱硫影响比甲苯的影响大,而对于苯并噻吩模拟油,甲苯的影响比吡啶的影响大。噻吩类硫化物与AgTY吸附剂之间主要以π络合及S—M配位作用机理吸附。
The TiO2-NaY（TY） complex support was prepared by the sol-gel method and the Ag/ TiO2-NaY（AgTY） sorbent was prepared by the impregnation method and characterized by X-ray diffraction （XRD）, fourier transform-infrared spectroscopy and X-ray photoelectron spectroscopy. Selective adsorption of thiophene （TP） and benzothiophene （BT） on AgTY zeolite from model gasoline containing different aromatics and nitrogen compounds, such as toluene and pyridine, was studied by using a fixed-bed adsorption column, and the adsorption mechanism of sulfocompound was researched. Results showed that anatase TiO2 was the main phase over AgTY adsorbent and the Y-zeolite framework of TY was unchanged compared with NaY. At the adsorption temperature of 50~C, breakthrough sulfur capacities of AgTY sorbent for TP and BT were 0. 45% and 0.63%, respectively. The effect of pyridine on the adsorption TP capacity of the AgTY was more conspicuous than that of toluene, while the influence of toluene was more conspicuous on the adsorption BT capacity compared with pyridine. The strong interactions between AgTY and thiophene compounds primarily complied with both the π-complexation adsorption mechanism and the S-M coordination mechanism.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2012年第6期920-926,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金项目(21276048)资助
关键词
沸石
选择性吸附
FT-IR
脱硫机理
zeolite
selective adsorption
FT-IR
desulfurization mechanism
