EDUARDO, R. S.; http://lattes.cnpq.br/6340178496383635; EDUARDO, Raphael da Silva.
Abstract:
The Fischer-Tropsch polymerization reaction of synthesis gas in the presence
of a catalyst, is presented as a sustainable opportunity to generate high quality fuels.
Given the need for development of new materials, this work aims to evaluate the
performance of catalysts Fe/Cu/K/SBA-15TEOS and Fe/Cu/K/SBA-15CCA in
Fischer-Tropsch synthesis. The catalysts were prepared using molecular sieves type
SBA-15 as support, synthesized with different silica sources (TEOS - tetraortosilicate
and rice husk ash - CCA). The metals were impregnated wet method using metal
salts as precursors. The molecular sieves SBA-15TEOS and SBA-15CCA were
characterized by X-ray diffraction (XRD), X-ray Spectrometry Energy Dispersive
(EDX), Scanning Electron Microscopy (SEM) and Physical Adsorption Capacity of
Nitrogen (BET). The Fe/Cu/K/SBA-15TEOS and Fe/Cu/K/SBA-15CCA catalysts were
characterized by X-ray diffraction (XRD), X-ray Spectrometry Energy Dispersive
(EDX), Physical Adsorption Capacity of Nitrogen (BET) and Temperature
Programmed Reduction (TPR). From the results obtained, the molecular sieve SBA15CCA
resembled the SBA-15TEOS, being characterized as mesoporous materials
typical morphology, but with different results of specific area (490 m2/g for SBA15TEOS
and 112 m2/g for SBA- 15CCA). The catalysts showed compositions of
sílica, iron, potassium and copper in pre-defined and good dispersion of the
molecular sieve, which retained its mesoporous structure proportions, but with
reduced specific area after impregnation (257.3 m2/g for Fe/Cu/K/SBA-15TEOS 91.7
m2/g for Fe/Cu/K/SBA-15CCA); By the TPR results, it was possible to check the
temperature ranges typical reduction of iron oxides phases and the influence of
copper in this process. The catalytic reviewed in Fischer-Tropsch synthesis was
satisfactory molar ratio H2/CO of 1:1, the converging high fractions of liquid
hydrocarbons. The catalyst Fe/Cu/K/SBA-15TEOS provided excellent conversion to
hydrocarbons heavier fractions C10+ (78.18%); Fe/Cu/K/SBA-15CCA catalyst
showed moderate conversion to liquid hydrocarbons C5+ (54.47%).