STUDY ON ADSORPTION REMOVAL OF PYRIDINE FROM MODEL FUELS BY THREE KINDS OF ACTIVATED ALUMINA

Abstract

Abstract: The pyridine in the model fuel（n-dodecane solution of pyridine） containing nitrogen with mass fraction of 1 732 μg/g was adsorbed by alkaline, acid and neutral alumina, respectively. To determine the best adsorbent, the effects of various adsorption factors on the adsorption efficiency were investigated. The results indicated that the best adsorption effect was obtained by using 1.2 g alkaline alumina at 303 K for 30 min when the 15 mL model fuel was adsorbed, and the nitrogen removal rate was 61.24%. Adsorption behavior of pyridine in simulated fuel by alkaline alumina accords with the Langmuir-Freundlich hybrid model. The adsorption process can be carried out spontaneously and belongs to exothermic physical adsorption, and accords with quasi-first-order kinetic model equation. After high temperature calcination or ethanol washing, the regeneration rates of the adsorbents were 72.04% and 71.48% respectively, which showed that alkaline alumina had good regeneration performance.

Key words: alumina, adsorption denitrogenation, kinetics, thermodynamics, regeneration

References

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