期刊
JOURNAL OF CATALYSIS
卷 279, 期 1, 页码 111-122出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2011.01.005
关键词
Fischer-Tropsch synthesis; Fe-SiO2 interaction; Zirconia modification; Fourier transform infrared spectroscopy
资金
- National Outstanding Young Scientists Foundation of China [20625620]
- Ministry of Science and Technology of China [2011CB201401]
- Synfuels CHINA Co., Ltd.
The modification of Fe-SiO2 interaction in iron catalysts for Fischer-Tropsch synthesis (FTS) by the incorporation of ZrO2 was investigated by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed reduction, powder X-ray diffraction, transmission electronic microscopy, and Mossbauer spectroscopy. The results indicated that the strong Fe-SiO2 interaction could be explained in terms of the formation of Fe-O-Si bonds between iron and SiO2, and these bonds were effectively weakened by ZrO2, which consequently enhanced the reduction and carburization of the catalyst and improved the stability of the iron carbides formed. FTS performances, tested in a fixed-bed reactor, showed that both the activity and the C-5(+) selectivity of the Zr-modified catalysts first increased, passed a maximum at Zr loading of 100Fe/20SiO(2)-20ZrO(2) with increasing zirconia, and then decreased dramatically at higher Zr loadings. The acid content in the water phase decreased, while the alcohol content increased with the addition of zirconia. (C) 2011 Elsevier Inc. All rights reserved.
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