以Na Y分子筛为载体,通过液相离子交换法制备了经Ag、Ce双金属离子改性的Ag Ce Y吸附剂,并利用UV-vis、XRD、BET、ICP、XPS和FT-IR技术对吸附剂进行了表征。以噻吩/苯并噻吩/正辛烷/甲苯体系为汽油模拟体系,考察了制备条件和吸附条件对...以Na Y分子筛为载体,通过液相离子交换法制备了经Ag、Ce双金属离子改性的Ag Ce Y吸附剂,并利用UV-vis、XRD、BET、ICP、XPS和FT-IR技术对吸附剂进行了表征。以噻吩/苯并噻吩/正辛烷/甲苯体系为汽油模拟体系,考察了制备条件和吸附条件对吸附剂脱硫性能的影响以及吸附剂再生性能。结果表明,Ag Ce Y吸附剂上Ag、Ce这两种金属元素分别以Ag+、Ce4+形式存在,Ag Ce Y吸附剂具有类似于Ag Y的高的脱硫性能,又具有类似于Ce Y的高的吸附选择性,Ag Ce Y对噻吩(TP)和苯并噻吩(BT)的吸附选择性顺序为BT>TP;最适宜的制备条件为先交换Ag后交换Ce离子、离子交换24 h、Ce/Ag物质的量比为2.5、500℃焙烧;在原料20 m L、Ag Ce Y吸附剂用量0.2 g、吸附温度50℃、吸附时间60 min下,噻吩脱硫率可达到59.0%,苯并噻吩脱硫率达到96.5%。展开更多
The AgCeY zeolite was successfully prepared via the microwave-assisted liquid ion exchange method and characterized by XRD, BET, XPS and Py–FTIR techniques. The effects of the preparation conditions, the equilibrium ...The AgCeY zeolite was successfully prepared via the microwave-assisted liquid ion exchange method and characterized by XRD, BET, XPS and Py–FTIR techniques. The effects of the preparation conditions, the equilibrium isothermal adsorption, kinetics, and thermodynamics were studied. The AgCeY zeolite that was ion-exchanged under conditions covering a microwave irradiation time of 20 min, a microwave power of 400 W, and a microwave temperature of 70℃, exhibited the best adsorptive desulfurization performance. The AgCeY zeolite prepared via the microwave-assisted irradiation process exhibited much higher Lewis acidity than that prepared via the conventional ion exchange method, which had contributed to its enhanced desulfurization performance. The adsorption of thiophene(TP) and benzothiophene(BT)on the AgCeY zeolite can be represented by the Langmuir model and the kinetics can be well described by the pseudo-.rstorder model, the pseudo-second-order model or the Langmuir model. The adsorption of TP and BT on the AgCeY zeolite is mass transfer controlled and involves a spontaneous exothermic process.展开更多
文摘以Na Y分子筛为载体,通过液相离子交换法制备了经Ag、Ce双金属离子改性的Ag Ce Y吸附剂,并利用UV-vis、XRD、BET、ICP、XPS和FT-IR技术对吸附剂进行了表征。以噻吩/苯并噻吩/正辛烷/甲苯体系为汽油模拟体系,考察了制备条件和吸附条件对吸附剂脱硫性能的影响以及吸附剂再生性能。结果表明,Ag Ce Y吸附剂上Ag、Ce这两种金属元素分别以Ag+、Ce4+形式存在,Ag Ce Y吸附剂具有类似于Ag Y的高的脱硫性能,又具有类似于Ce Y的高的吸附选择性,Ag Ce Y对噻吩(TP)和苯并噻吩(BT)的吸附选择性顺序为BT>TP;最适宜的制备条件为先交换Ag后交换Ce离子、离子交换24 h、Ce/Ag物质的量比为2.5、500℃焙烧;在原料20 m L、Ag Ce Y吸附剂用量0.2 g、吸附温度50℃、吸附时间60 min下,噻吩脱硫率可达到59.0%,苯并噻吩脱硫率达到96.5%。
基金financial supports from the National Natural Science Foundation of China (81172204)
文摘The AgCeY zeolite was successfully prepared via the microwave-assisted liquid ion exchange method and characterized by XRD, BET, XPS and Py–FTIR techniques. The effects of the preparation conditions, the equilibrium isothermal adsorption, kinetics, and thermodynamics were studied. The AgCeY zeolite that was ion-exchanged under conditions covering a microwave irradiation time of 20 min, a microwave power of 400 W, and a microwave temperature of 70℃, exhibited the best adsorptive desulfurization performance. The AgCeY zeolite prepared via the microwave-assisted irradiation process exhibited much higher Lewis acidity than that prepared via the conventional ion exchange method, which had contributed to its enhanced desulfurization performance. The adsorption of thiophene(TP) and benzothiophene(BT)on the AgCeY zeolite can be represented by the Langmuir model and the kinetics can be well described by the pseudo-.rstorder model, the pseudo-second-order model or the Langmuir model. The adsorption of TP and BT on the AgCeY zeolite is mass transfer controlled and involves a spontaneous exothermic process.
