PREPARATION OF HETEROATOMIC MESOPOROUS MOLECULAR SIEVE Ba-MCM-41 AND ITS ADSORPTIVE AND DENITRIFICATION PERFORMANCE

Abstract

Abstract: Mesoporous MCM-41 and Ba-MCM-41 molecular sieves were successfully prepared by hydrothermal synthesis and characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometry (FT-IR) and nitrogen adsorption-desorption techniques. Ba-MCM-41 molecular sieve was used to remove nitrogen from simulated oil by static adsorption. The results showed that the best adsorption and denitrification effect was achieved when the molecular sieve dosage was 0.3 g, adsorption temperature was 30 ℃,adsorption time was 10 min and the simulated fuel dosage was 15 mL. The results of adsorption showed that the adsorption of pyridine and aniline on Ba-MCM-41 molecular sieve accorded with Freundlich isothermal adsorption, while that of quinoline accorded with Langmuir isothermal adsorption. The XRD spectra of MCM-41 molecular sieve constructed by Materials Studio software was identical to that of the samples prepared by the experiment. The adsorption energy of pyridine, aniline and quinoline molecules on Ba-MCM-41 molecular sieve and their distances from the active center of Ba-MCM-41 molecular sieve were calculated. The calculated results of the adsorption energies of three nitrogen compounds on Ba-MCM-41 were in agreement with the experimental results. The adsorption capacity of Ba-MCM-41 molecular sieve for pyridine and aniline was stronger than that for quinoline.

Key words: Ba-MCM-41, adsorption denitrification, simulation calculation, pyridine, aniline, quinoline

References

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