Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (9): 2337-2345.doi: 10.3866/PKU.WHXB201605241

• ARTICLE • Previous Articles     Next Articles

Oxygenation and Oxidation Desulfurization Properties of CeO2/NaY Catalysts

Jun DU,Xiang-Ying WU,Xing-Peng PAN,Jiang YU*()   

  • Received:2016-02-29 Published:2016-09-08
  • Contact: Jiang YU E-mail:yujiang@mail.buct.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21576020);Fundamental Research Funds for the Central Universities, China(YS1401)

Abstract:

CeO2/NaY catalysts were prepared by incipient wetness impregnation. The influence of the calcination temperature and Ce content on the crystallinity and performance of the active species of the catalysts was studied in this paper. The synthesized catalysts were characterized by Raman spectroscopy, X-ray diffraction (XRD), low temperature nitrogen adsorption-desorption (Brunauer-Emmett-Teller (BET)), highresolution transmission electron microscopy (HR-TEM), and H2-temperature-programmed reduction (H2-TPR). The results indicate that the calcination temperature and the Ce content have an important influence on the morphology of the cerium species and whether they can be uniformly dispersed on the surface and channels of the zeolite, and on the interaction between the cerium species and zeolites, which affects the oxygenation and oxidation desulfurization properties of the cerium species of the catalysts. The oxygenation properties of the prepared catalysts are tested under normal temperature and atmospheric pressure. The maximum oxygen storage capacity is 1.44 mmol·g-1. The conversion rate of dibenzothiophene (DBT) reaches up to 90.10% within 240 min when a 20 mL mixture of octane and DBT as a model oil is treated by the addition of 0.20 g catalyst under 50 mL·min-1 of oxygen flow at 100 ℃. The initial concentration of DBT is 500 μg·g-1. The oxidation product is dibenzothiophene sulfone (DBTO2). Therefore, it is of great significance to develop zeolites modified by rare earth elements to complex as functionalized catalysts with molecular oxygen for deep desulfurization of fuel oil, which can be easily done by air or oxygen oxidation without secondary pollution.

Key words: NaY zeolite, CeO2, Oxygenation property, Dibenzothiophene, Catalytic oxidation

MSC2000: 

  • O643