Fe-promoted Pt@CeO2 Catalysts for CO2 Hydrogenation to C1 Products
Transition metal promoters were introduced on the surface of the Pt@CeO2 core@shell nanospheres,and the effects of different transition metals on the CO2 hydrogenation performance were investigated.The results show that the introduction of Fe species has the best effect on the enhancement of the hydrogenation performance,with a liquid C1 yield of 6.34×10-2 mmol·g-1cat.·h-1.Transmission electron microscopy(TEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),N2 adsorption-desorption experiments,CO2 temperature-programmed desorption(CO2-TPD),and H2 temperature-programmed reduction(H2-TPR)experiments reveal that Fe promoter was dispersed on the surface of Pt@CeO2,and Fe promoter decreases the charge density of Pt,generating more Pt2+ species and improving the selectivity of methanol.In addition,it also facilitates the formation of more oxygen vacancies(Ov),which in turn facilitate the adsorption of CO2 as well as the subsequent hydrogenation reaction,and improve the catalytic activity.
CO2 hydrogenationC1 productCore@shell nanospheresFe promoter
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