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Song H.,Heilongjiang University | Song H.,Northeast Petroleum University | Wan X.,Northeast Petroleum University | Wan X.,CPE Survey and Design Institute of Xinjiang Oil | And 5 more authors.
Fuel Processing Technology | Year: 2013

Adsorbents were successfully prepared by liquid-phase ion-exchange of Y zeolites with Cu, Ce and combined Cu-Ce metal ions. The adsorbents were characterized by means of X-ray diffraction (XRD), N2-adsorption specific surface area measurements (BET), Fourier transform infrared (FT-IR), H2 temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) techniques. The adsorptive desulfurization properties of the adsorbents were studied in a fixed-bed unit through a model gasoline which was made up of 1-octane solution of refractory sulfur compounds (such as thiophene and benzothiophene) and certain amounts of toluene, pyridine or cyclohexene. Results indicate that CuICeIVY not only has a high sulfur adsorption capacity similar to CuIY but also has a high selectivity for sulfur compounds similar to CeIVY. For each sorbent, the selectivity of adsorption of sulfur compounds from liquid solutions followed the order: benzothiophene > thiophene. The effect on the metal ion-exchanged Y zeolites for sulfur removal was in the order: pyridine > cyclohexene > toluene. The high selectivity of CuICeIVY for sulfur removal can be attributed to the synergistic interaction between Cu+ and Ce4 +. The CuICeIVY zeolite binds organic sulfur compounds through two types of adsorption modes: π-complexation and direct coordination (S-M) interaction. © 2013 Elsevier B.V.

Song H.,Northeast Petroleum University | Chang Y.,Northeast Petroleum University | Wan X.,Northeast Petroleum University | Wan X.,CPE Survey and Design Institute of Xinjiang Oil | And 4 more authors.
Industrial and Engineering Chemistry Research | Year: 2014

The CuIY, CeIVY, and CuICeIVY zeolites were successfully prepared and the competive adsorptions of toluene, cyclohexene, and pyridine were investigated. The results indicate that the effects on the metal ion-exchanged Y zeolites for sulfur removal decrease in the order pyridine > cyclohexene > toluene. The CuICe IVY not only has high sulfur adsorption capacity, similar to Cu IY, but also has high selectivity for sulfur compounds, similar to CeIVY. The isotherms and kinetics of benzothiophene (BT) adsorption from 1-octane onto CuICeIVY were studied, and the thermodynamic parameters (ΔG, ΔH, ΔS) for the adsorption of BT were calculated. The results show that the isothermal equilibrium can be represented by the Langmuir model and that maximum adsorption capacities (q m) increase with an increase of temperature. The kinetics for the adsorption process can be described by either the Langmuir model or a pseudo-first-order model. The adsorption is spontaneous and exothermic. © 2014 American Chemical Society.

Song H.,Northeast Petroleum University | Dai M.,Northeast Petroleum University | Dai M.,CPE Survey and Design Institute of Xinjiang Oil | Song H.,Mudanjiang Medical College | And 3 more authors.
Applied Catalysis A: General | Year: 2013

A novel method to prepare Ni2P/MCM-41 catalysts at low reduction temperature based on ammonium hypophosphite and nickel chloride by temperature programmed reduction is described. The catalysts were prepared using incipient wetness impregnation of the siliceous MCM-41 support with aqueous solutions of ammonium hypophosphite and nickel chloride, followed by reducing the obtained precursor at 483-663 K for 2 h in flowing H2, to form Ni2P catalysts. The catalysts were characterized by H2 temperature-programmed reduction (H2-TPR), X-ray diffraction (XRD), N2-adsorption specific surface area measurements (BET), CO uptake, transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). With sample of initial P/Ni molar ratio >0.5, the Ni2P was successfully obtained at lower reduction temperature, and a high initial P/Ni molar ratio favors the formation of Ni2P at lower temperature. Using less oxidic phosphorus precursor of hypophosphite enabled the Ni2P to be formed at low reduction temperature. Evaluation of the activity for DBT HDS of the catalysts shows that the catalyst prepared with initial P/Ni ratios of 2 exhibited the highest activity. At a reaction temperature of 613 K, a pressure of 3.0 MPa, a H2/oil ratio of 500 (V/V), and a weight hourly space velocity (WHSV) of 2.0 h-1, the HDS conversion reached 99%, and no catalyst deactivation was observed within 120 h. © 2013 Elsevier B.V. All rights reserved.

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