ADSORPTIVE DENITRIOGENATION OF NaY MOLECULAR SIEVE MODIFIED BY Ni2+ AND Ba2+

Abstract

Abstract: A series of Ni-Ba-Y molecular sieves was obtained by ion exchange method at different temperature and modifier concentrations, the adsorption denitrogenation experiments were conducted. Experimental results showed that the obtained Ni-Ba-Y molecular sieve prepared at modification temperature of 70 ℃ and the modifier concentration of 0.25 mol/L exhibits the best adsorption performance, the XRD and IR results showed a similar characteristic peak of modified Ni-Ba-Y to the standard NaY molecular sieve. The results of FT- IR indicated a decrease of 1 147 cm-1 peaks strength and a blue shift of the peak at 1024 cm-1, meaning Ni2+ and Ba2+ being successfully exchanged into the NaY zeolite framework. Experiment data of the quinoline adsorption isotherm were fitted by Langmuir, Freundlich and Langmuir-Freundlich mixed adsorption models, the results revealed that the R2 of three regression equations is close to each other, but the Langmuir-Freundlich mixed adsorption model is any better. The effects of adsorption time on denitrogenation from the simulated fuels over NaY, NiY and Ni-Ba-Y molecular sieves were compared. The adsorption capacity of NiY molecular sieve is significantly superior to that of NaY molecular sieve, while the adsorption capacity of Ni-Ba-Y is similar to that of NaY molecular sieve.

Key words: NaY molecular sieve, modification, adsorptive denitrogenation

CLC Number:

References

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