PREPARATION OF AgY MOLECULAR SIEVES AND ITS ADSORPTION PERFORMANCE OF PYRIDINE IN SIMULATED FUELS

Abstract

Abstract: AgY zeolite was prepared by ion exchange method, and characterized by X-ray diffraction. NaY and AgY zeolites were used to the static adsorptive denitrification of pyridine in simulated fuel. The results showed that the adsorption and denitrification capacity of AgY zeolite was better than that of NaY zeolite, and the suitable adsorption and denitrification conditions of AgY zeolite were as follows: an amount of simulated fuel of 15 mL, an amount of AgY zeolite of 0.2 g, an adsorption temperature of 333 K, and an adsorption time of 40 min. The cluster models of NaY and AgY zeolite were established by using Materials Studio software, and the adsorption energy of pyridine on NaY and AgY zeolite and the distance between pyridine and the active center were calculated. The distance between pyridine and the active center of AgY zeolite was smaller than that of NaY zeolite, so the adsorption performance of AgY zeolite was better than that of NaY zeolite. The adsorption behavior of pyridine on AgY zeolite confirmed to the Langmuir-Freundlich mixed model. The adsorption thermodynamics and kinetics of pyridine on AgY zeolites were investigated. The adsorption reaction is a spontaneous process of adsorption entropy increase, and the adsorption process accords with the quasi-second-order kinetic model at the temperature of 333 k.

Key words: AgY molecular sieve, adsorptive denitrification, simulation calculation, kinetics, thermodynamics

References

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