期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 244, 期 -, 页码 576-582出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2018.11.082
关键词
Fischer-Tropsch synthesis; Iron-based catalyst; Iron ore; Eco-friendliness
资金
- Research and Development Program of the Korea Institute of Energy Research [GP2016-0057-09/B8-2432-02]
- National Research and Development Program of the Korea Institute of Energy Technology Evaluation and Planning [NP2015-0091/B7-3209]
The iron-ore-based catalysts (IO-CAT) with catalytic properties similar to those of conventional precipitated iron-based catalysts (PFe-CAT) were successfully prepared through a combination of a wet-milling process and a wet impregnation method. This approach was much more economical and eco-friendly than a conventional precipitation technique in terms of the amounts of water and chemicals used and discharged. The IO-CAT exhibited higher surface area, a larger pore volume, and a smaller crystallite size than the unmodified iron ore samples (IO-U). In particular, the pore volume of IO-CAT was as large as that of PFe-CAT. Furthermore, the reducibility and surface basicity of IO-CAT were much higher than those of IO-U and comparable to those of PFe-CAT, which implies that a reduction promoter, Cu, and an alkali promoter, K, are used successfully to impregnate the well-developed pore structure of IO-CAT. As a result, the IO-CAT showed catalytic performance favorable for low-temperature Fischer-Tropsch synthesis (LT-FTS) using hydrogen-deficient syngas (H-2/CO = 1) in all aspects of CO conversion (75%), CO2 selectivity (43 C-mol%), and C5+ selectivity in hydrocarbons (71 wt%). The overall catalytic performance of IO-CAT was much greater than that of IO-U and comparable to that of PFe-CAT. This strongly demonstrates new potential for economical and eco-friendly preparation of iron-based catalysts for LT-FTS.
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