Catalytic activity of H-ZSM-5 and Cu-HZSM-5 zeolites of medium SiO2/Al2O3 ratio in conversion of n-hexane to aromatics

Add time:08/10/2019    Source:sciencedirect.com

H-ZSM-5 and Cu-HZSM-5 composite zeolites with a medium SiO2/AL2O3 ratio was successfully synthesized using a incipient-wetness impregnation method and characterized via physico-chemical analysis, such as X-ray diffraction (XRD), scanning electron microscope (SEM),N2-physisorption, BET, and temperature programmed desorption of ammonia (NH3-TPD). Activity of the catalysts and acid properties of high-silica zeolite H-ZSM-5 modified with Cu was investigated for conversion of hexane into value-added hydrocarbons. It was noticed that the introduction of the modified metal Cu during the stage of impregnation synthesis changed catalytic and acid properties of the original zeolite. The obtained results display that the amount of Cu metal content plays a centric role in the formation of Cu-HZSM-5 zeolite catalyst. Comparing to H-ZSM-5 and 1.5Cu-HZSM-5, the 3Cu-HZSM-5, 6Cu-HZSM-5 and 9Cu-HZSM-5 catalysts exhibited more catalytic efficiency in the aromatization process of the investigated alkanes, as well as increased the products of aromatic/gasoline-ranged hydrocarbons and diminished the products of hydrocarbon gases.

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