Studies on Nanosized Iron Based Modified Catalyst for Fischer-Tropsch Synthesis Application

Park, Moonju; Kang, Jung Shik; Na, Ki Poong; Lee, Sang Deuk; Awate, S. V.; Moon, Dong Ju

doi:10.1166/jnn.2011.3334

Cited by 4 publications

(7 citation statements)

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“…The Mg-promoted catalysts show smaller crystalline size than α-Fe 2 O 3 , while Cu-promoted catalysts for the Fe 2 O 3 –MgO show crystallite size comparable to α-Fe 2 O 3. Our results are consistent with the recently reported study by Park et al who indicate that iron particle size decreases with increased Mg content.…”

Section: Resultssupporting

confidence: 94%

“…The 250 °C peak probably corresponds to the reduction of surface Fe 3+ to mixture of Fe 3+ and Fe 2+ (Fe 3 O 4 ) while that at 300 °C corresponds to the reduction of α-Fe 2 O 3 which interacts directly with MgO to Fe 3 O 4 . The 325 °C peak can be attributed to reduction of tridimensional α-Fe 2 O 3 to Fe 3 O 4 . ,− …”

Section: Resultsmentioning

confidence: 99%

“…Also, no X-ray powder diffraction patterns were detected for copper oxides in the Cu-promoted catalysts, indicating that Cu-promoted precursors do not affect the α-Fe 2 O 3 oxide crystalline phases. The hematite iron oxide structures, once formed, remain stable during subsequent thermal treatment, and aqueous impregnation . The effects of adding magnesium and copper oxides to the crystallite on iron oxide particle size were calculated by Scherrer’s equation and depicted in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Further Mg promoters suppress methane formation, facilitate the reduction and carburization extent and increase BET specific area 7,8 . However, there is little work reported on adding magnesium as a promoter to improve the catalytic performance of iron-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, Mg promoters have been found to increase FTS activity, stability, and particularly to increase the C 5 –C 11 chain selectivity. Further Mg promoters suppress methane formation, facilitate the reduction and carburization extent, and increase BET specific area. , However, there is little work reported on adding magnesium as a promoter to improve the catalytic performance of iron-based catalysts. It has been shown by Yang et al .…”

Section: Introductionmentioning

confidence: 99%

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A series of precipitated Fe 2 O 3 /MgO catalysts incorporated with the copper promoter were prepared by the combination of coprecipitation and incipient witness impregnation methods. The catalysts were characterized by N 2 -adsorption-desorption isotherms, Xray diffraction (XRD), H 2 temperature programmed reduction (H 2 -TPR), CO temperature programmed desorption (CO-TPD), O 2 temperature programmed oxidation (O 2 -TPO), laser Raman spectroscopy (LRS), and X-ray absorption near edge structure (XANES). The Fischer-Tropsch (FT) synthesis reaction of the catalysts was also performed in a fixed bed reactor using different H 2 /CO ratios (H 2 /CO = 1 or 2). The characterization results indicated that Mg increases the BET surface area of precipitated oxide precursors by inhibiting sintering during thermal treatment, and leads to the formation of the relatively smaller iron crystallite size. Cu increases the rate of Fe 2 O 3 reduction by providing H 2 dissociation sites. The content of iron carbide phases during TPR process in the synthesis gas increases with the increase of copper content and reaches a maximum for the Cu/Fe atom ratio of 0.02. The optimal catalyst with Cu/Fe = 0.02 has high activity. A maximum in the catalytic activity and methane selectivity was obtained for the synthesis gas ratio of 2 (H 2 /CO = 2).

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Section: Resultssupporting

confidence: 94%