EFFECT OF SUPPORT MODIFICATION ON METAL DISTRIBUTION AND STATE OF Ru/MCM-49 CATALYST

Abstract

Abstract: Ru-Ca/H-MCM-49 catalyst and Ru-Mg/H-MCM-49 catalyst were prepared from MCM-49 zeolite modified by Ca and Mg and impregnated with Ru, and the effect of alkali metal modification on Ru particle size of Ru/H-MCM-49 zeolite catalyst was investigated. The catalysts were characterized by XRD, FT-IR, SEM, XPS, CO pulse adsorption, probe molecular reaction, and in situ CO-DRIFTS analysis. The results showed that the two modified metals had little effect on the distribution of Ru in the zeolite, and the Ru of both catalysts was distributed inside the zeolite, but the Ca modified Ru catalyst had the phenomenon of micro-porous blockage. The impregnated alkali metal species could significantly affect the size of Ru in the catalyst, and the support impregnated with Mg could better disperse Ru to form Ru nano-particles of about 2.7 nm, which showed higher probe molecular reaction performance. Catalyst Ru-Mg/H-MCM-49 adsorbed CO by linear multi-molecular adsorption, which had strong adsorption and activation effect on reactant molecules, and was beneficial to the hydrogenation activity of the catalyst.

Key words: MCM-49 zeolite, metal size, alkaline-earth metal, DRIFTS

References

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