EFFECT OF THERMAL TREATMENT METHOD ON STRUCTURE AND HYDRODENITROGENATION PERFORMANCE OF NiMoAl CATALYST

Abstract

Abstract: The NiMoAl catalyst precursor synthesized by sol-gel method was thermal treated in air, nitrogen and liquid paraffin, respectively, to prepare 3 kinds of NiMoAl catalysts. The physical and chemical properties of these catalysts were analyzed by X-ray diffraction (XRD), thermogravimetry-mass spectrometry (TG-MS), nitrogen adsorption-desorption, ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and transmission electron microscopy (TEM). Using quinoline hydrodenitrogenation (HDN) as a reaction probe, the effect of precursor thermal treatment on the catalytic hydrodenitrogenation performance of NiMoAl catalyst samples was investigated. The results showed that the NiMoAl catalyst prepared by liquid-phase thermal treatment had larger pore volume and higher active metal dispersion in comparison with the sample calcinated in air. Besides, the aggregation of MoS2 was found on the surface of the catalyst calcinated in nitrogen. Compared with other two thermal treatment methods, the NiMoAl catalyst obtained through liquid-phase thermal treatment exhibited a higher selectivity for denitrogenation products in the HDN reaction of quinoline.

Key words: NiMo catalyst, hydrodenitrogenation, thermal treatment, quinoline

CLC Number:

References

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