常温常压下β沸石改性吸附剂脱除噻吩类硫的研究  

Study on desulfurization of thiophene over modified zeolite beta sorbents under ambient conditions

作　　者：康善娇[1] 窦涛[1] 巩雁军[1] 李强[1] 郑燕英[1] 

机构地区：[1]中国石油大学(北京)CNPC催化重点实验室,北京102249

出　　处：《燃料化学学报》2006年第5期625-628,共4页Journal of Fuel Chemistry and Technology

基　　金：国家重点基础研究发展规划(973计划;2004CB217806);国家自然科学基金(20476060)

摘　　要：在合成不同硅铝比Naβ沸石的基础上,采用固相离子交换方法制备了Cu(I)、Ag(I)离子改性的β沸石系列吸附剂。样品的结晶度和BET比表面积有所降低,XRD表征结果表明,所制备的样品保持了结构的完整性,随着硅铝比的增加,Naβ样品的BET比表面积增加。Cu(I)、Ag(I)离子的引入使样品的红外骨架振动峰向低波数移动,与相同硅铝比的Naβ沸石相比,吸附剂的BET比表面积有所降低。对模型油的静态吸附结果表明,硅铝摩尔比为25时Cu(I)β吸附性能最好,模型油中硫的质量分数降到10×10-6以下,脱除率达到95%,Ag(I)β次之,脱除率达到87%。常温常压下固定床动态吸附穿透实验得到Cu(I)β、Ag(I)β的穿透硫容分别为0.144 mmol/g和0.132 mmol/g。Through solid-state ionic exchange technique, a series of Cu （I）, Ag （I） cation modified zeolite β sorbents were prepared on the base of preparation of Naβ zeolite with different Si/A1 ratio. The samples were characterized by XRD, FTIR and N2 adsorption-desorption technique. Although the crystallicity and BET surface area of the sorbents are affected by exchanged metal cation in the framework, the XRD results show that as-made samples were kept framework structure integrity. The BET surface areas of as-made Naβ samples decrease as the Si/Al ratio increase, and BET surface areas of Cu（I）β , Ag（I） β sorbents decrease comparing with the same Si/Al ratio Naβ zeolite. FF-IR spectra of the samples show that the peak of framework vibration moves to low wave number as Cu （ I）, Ag （I） were inserted. Then the thiophene adsorption properties of Cu （I） β , Ag （I） β , Na β were evaluated at ambient conditions. Static state experimental results show that Cu（I）β exhibits stron- ger adsorption for thiophene. As the Si/A1 mol ratio of zeolite β is 25 about 95% thiophene was adsorbed by Cu （I）β and 87% by Ag（I）β. Through dynamic adsorption experiments, the breakthrough capacities of the Cu （I）- β and Ag（I）- β sorbents are 0. 144 mmol/g and 0. 132 mmol/g, respectively.

关 键 词：Cu(I)β Ag(I)β 吸附剂 噻酚 脱硫 

分 类 号：TE624.54[石油与天然气工程—油气加工工程]