The Effect Of Ca Doping On The CO2 Hydrogenation Performance Of CaxZn10-xFe20 Catalysts (x=0, 0.5, 1 and1.5).

In this paper, CaxZn10-xFe20 catalysts were prepared by the co-precipitation method and applied to CO ₂ hydrogenation. The experimental results show that the CO ₂ conversion of the catalyst Ca1Zn9Fe20 at a Ca doping amount of 1 mmol can reach 57.91 %, which is 13.5 % more than the CO ₂ conversion of the catalyst Zn10Fe20. Moreover, the catalyst Ca1Zn9Fe20 has the lowest selectivity for both CO and CH _4, with 7.40 % and 6.99 %, respectively. The catalysts were characterized by XRD, N ₂ adsorption-desorption, CO ₂ -TPD, H ₂ -TPR, and XPS. The results demonstrate that the doping of Ca increases the basic sites on the catalyst surface and thus allows the catalyst to adsorb more CO ₂ to promote the reaction. Besides, the Ca doping amount of 1 mmol can suppress the formation of graphitic carbon on the catalyst surface and prevent the excess graphitic carbon from covering the active site Fe ₅ C ₂ .
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