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Citation: Chen Kai-Dong, Yan Qi-Jie. Influence of Ceria on the Structure and Catalytic Property of F-T Synthesis Fe/ZrO₂ Catalysts[J]. Acta Physico-Chimica Sinica, ;1996, 12(11): 990-994. doi: 10.3866/PKU.WHXB19961107 shu

Influence of Ceria on the Structure and Catalytic Property of F-T Synthesis Fe/ZrO₂ Catalysts

1.
Department of Chemistry,Nanjing University,Nanjing 210093

Received Date: 24 June 1996
Available Online: 15 November 1996

Ceria promoted Fe/ZrO2 catalysts were prepared by different impregnation methods. The structure, reduction behavior, CO desorption behavior, and catalytic property of various catalysts were studied by XRD, Mossbauer spectroscopy, TPR, XPS, CO-TPD, and CO hydrogenation reaction test. It is shown that the catalytic activity of ceria promoted Fe/ZrO2 catalysts is much higher than that of the unpromoted Fe/Zr sample, while methane formation is suppressed and light olefins selectivity slightly increases. The different catalyst preparation methods affect the structure and reduction behavior of Ce-Fe/ZrO2 catalysts, but do not obviously influence the catalytic properties for CO hydrogenation. The promotion effect of ceria can be explained in terms of the formation of new catalytic active sites (Fe-CeO2 ensembles) at which CO may bond with its carbon atom to iron atom and its oxygen atom to the partially reduced cerium oxide. This results in a wakening of the C-O bond, and the dissociation and reaction of CO is markedly enhanced.
- CO hydrogenation,
- Light olefins,
- Fe/ZrO₂ catalyst,
- Ceria promoter
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沈阳化工大学材料科学与工程学院沈阳 110142

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Influence of Ceria on the Structure and Catalytic Property of F-T Synthesis Fe/ZrO2 Catalysts

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Influence of Ceria on the Structure and Catalytic Property of F-T Synthesis Fe/ZrO₂ Catalysts