摘要
通过原位水热合成方法直接制备出不同载Ce量的Ce(Ⅳ)-X分子筛,并考察了其对模拟汽油中噻吩的吸附性能。采用粉末X射线衍射(XRD)、傅里叶变换红外(FT-IR)、紫外-可见漫反射(UV-vis DRS)、全谱直读等离子体原子发射光谱(ICP-AES)、氮气吸附和NH3程序升温热脱附(NH3-TPD)等方法对分子筛进行表征。结果表明,合成分子筛均具备典型的X型分子筛结构,同时Ce(Ⅳ)被较好地引入到分子筛的骨架结构中;载Ce分子筛的酸性大于X分子筛,而且Ce(Ⅳ)-X分子筛的酸性随着Ce掺杂量的增加而增强。吸附实验表明,载Ce分子筛对噻吩的吸附性能明显好于X分子筛。其中,n(Ce)/n(Si)=0.05的分子筛脱硫效果最佳,饱和吸附容量达到52.541 9 mg/g。再生实验表明,加热再生的Ce(Ⅳ)-X分子筛对噻吩仍具有理想的吸附效果。n(Ce)/n(Si)=0.05的分子筛再生后饱和吸附容量为47.512 1 mg/g,约为新鲜吸附剂的90.43%。
A series of cerium-incorporated X zeolites （Ce （IV）-X） with different Ce/Si molar ratios were prepared by in situ hydrothermal synthesis and used as adsorbents to remove thiophene from a model fuel. The synthesized Ce （IV）-X zeolites were characterized by X-ray diffraction （XRD）, fourier transform infrared spectroscopy （FT-IR）, diffuse reflectance ultraviolet spectroscopy （UV-vis DRS ）, plasma atomic emission spectrometry （ICP-AES）, N2 adsorption, and NH3 temperature programmed desorption （NHa-TPD）. Results reveal that the synthesized Ce （IV） -X zeolites exhibit typical structure of X zeolites and cerium （ IV ） ions are well dispersed in the framework of X zeolites. The acidity of Ce （IV） -X is enhanced by incorporating cerium, especially at high cerium content. The synthesised Ce （IV）-X zeolites exhibit better capability for the adsorption of thiophene from the model fuel than X zeolites; the Ce （IV） -X sample with n （ Ce ）/n （ Si ） = 0. 05 performs best, possessing a saturated adsorption amount of 52. 541 9 mg/g. Moreover, the spent Ce （IV）-X after regeneration still has a perfect adsorption ability towards thiophene; the regenerated Ce （IV）-X sample with n （Ce）/n（Si） = 0.05 has a saturated adsorption amount of 47. 512 1 mg/g, i.e. 90.43% of that for the fresh adsorbent.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2012年第12期1480-1486,共7页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(20977040)
淮海工学院自然科学基金(2009023)
关键词
水热制备
Ce(Ⅳ)
X分子筛
噻吩
吸附
再生
hydrothermal synthesis
Ce （ 1V ）
X zeolite
thiophene
adsorption
regeneration
