Citation:
CHEN Hong-xian, NING Wen-sheng, CHEN Chun-hua, ZHANG Tian. Influence of Fe2O3 crystal phase on the performance of Fe-based catalysts for CO2 hydrogenation[J]. Journal of Fuel Chemistry and Technology,
;2015, 43(11): 1387-1392.
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FeAl precursors (remarked as P) were prepared by co-precipitation method. Then they were impregnated with promoter Zn, K and Cu into ZnKCu/FeAl catalysts (remarked as C). The precursors and catalysts were characterized by low temperature N2 adsorption, XRD and H2-TPR. CO2 hydrogenation over these catalysts was investigated in a fixed-bed reactor. With the addition of Al, the specific surface area of FeAl precursors and ZnKCu/FeAl catalysts was increased relative to that of Al-free samples. On the contrary, the crystallite size of a-Fe2O3 was decreased by the added Al. The dispersed degree of Cu was raised in the catalysts containing Al. It is benefit for the reduction of ZnKCu/FeAl catalysts. However, the specific surface area and a -Fe2O3 crystallite size of P-10 and C-10, in which the Al2O3/Fe2O3 mass ratio is 10%, were similar to those of P-5 and C-5 with 5% Al 2O3/Fe2O3 mass ratio, respectively. The phenomena were resulted from the strong g-Fe2O3 phase in P-10 and C-10. It was evidenced that g-Fe2O3 was formed only in the case of Fe and Al were co-precipitated, and the precipitate was washed by anhydrous ethanol in this study. The catalyst with strong g-Fe2O3 phase was more active in CO2 hydrogenation than the catalysts with none or weak g-Fe2O3 phase. This correlation was supported by the comparison between two catalysts with the same Al content, but different Fe2O3 phases in them.
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Keywords:
- Fe-based catalyst,
- Al content,
- Fe2O3crystal phase,
- CO2hydrogenation
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