Journal
JOURNAL OF CATALYSIS
Volume 282, Issue 1, Pages 35-46Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2011.05.020
Keywords
Fischer-Tropsch synthesis; Iron; Molybdenum; Pretreatment; Mo migration effect
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Funding
- National Outstanding Young Scientists Foundation of China [20625620]
- National Natural Science Foundation of China [20703054, 20590361]
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Unpromoted and Mo-promoted iron catalyst precursors (100Fe. 100Fe5Mo, and 100Fe10Mo) were prepared by a coprecipitation method, and were subsequently characterized by laser Raman spectroscopy. Mossbauer spectroscopy, at 298 K and 20 K. X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. The effect of pretreatment with H-2, CO, and H-2/CO - 0.67 at 280 and 350 degrees C was investigated. Specifically, the reduction/carburization behaviors and the evolution of iron phases and Mo species in the catalysts during the pretreatment and during the FTS reaction were extensively studied. During pretreatment, the catalyst structure experienced an extensive restructuring process that was strongly dependent on the pretreatment protocols and Mo promoter loading levels. The microscopic information confirmed this effect on the iron active-site dispersion and the catalytic performance. (C) 2011 Elsevier Inc. All rights reserved.
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