Characterization of iron-based catalysts supported on SBA-15 applied in the Fischer-Tropsch synthesis
a review
DOI:
https://doi.org/10.14295/holos.v24i2.12505Keywords:
SBA-15, Iron, Potassium, Rice husk ashes, Fischer-Tropsch synthesis.Abstract
Synthesis processes using simple compounds become attractive for offer alternatives routes from fuel production. Iron-based catalysts have wide applicability in the Fischer Tropsch process. This work aims to evaluate the catalyst Fe/Cu/K/SBA-15 in the Fischer Tropsch synthesis. The catalyst was prepared with the molecular sieve SBA-15 synthesized by hydrothermal method with rice husk ashes, treated by heat and chemical processes, as silica source and simultaneous incorporation of metals by wet impregnation of molar ratio 100Fe/5Cu/18K/139SiO2. The catalyst was submitted to heat treatment under nitrogen and synthetic air flow. The Fischer Tropsch synthesis was carried out in a slurry bed reactor operating at 240ºC, 10 atm and H2:CO molar ratio raging in 1 and 2. The SBA-15 and the catalyst were characterized by XRD, EDX, and nitrogen adsorption, SBA-15 by SEM, and the catalyst for RTP. SBA-15 showed typical morphology traces of mesoporous materials with small specific area of 112m2/g. The catalyst presented the pre-defined composition, maintaining the structure, but with area reduction after impregnation (92m2/g). By RTP results was found the ranges of temperature reduction typical of iron oxides phases. The catalyst showed moderate conversion to liquid hydrocarbons C5+ (54.47%) in the molar ratio H2/CO of 1:1.
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