LIMA, W. S.; http://lattes.cnpq.br/5721661926750809; LIMA, Wellington Siqueira.
Résumé:
In recent years, the natural gas conversion to liquids (GTL) via Fischer-Tropsch
synthesis (FTS) has received renewed interest for reasons ranging from the vast
reserves of natural gas to the excellent quality of synthetic fuels produced by this
process. For this reason, if the search is necessary for new catalysts that enable an
increase in selectivity to higher value-added products in the Fischer-Tropsch
reaction. Thus, this study aimed to: the preparation and characterization of zeolite
support MCM-22 through the static hydrothermal method, a first step. The second
part of this work consisted in the preparation of the cobalt-based catalysts and
ruthenium as a promoter of the reaction, obtained by wet impregnation and
supported on MCM-22 zeolite. Finally, to assess the performance of catalysts in the
Fischer-Tropsch reaction for the production of long chain C5+ hydrocarbons. The
catalysts were characterized by techniques: X-ray diffraction, X-ray dispersive
spectroscopy, N2 adsorption of Physics, Temperature Programmed Reduction and
Transmission Electron Microscopy. The catalytic tests were conducted at a fixed
temperature of 240 °C, pressures ranging between 10 and 20 bar and a H2/CO feed
between 1-2, in a slurry bed reactor for a period of 6h. The results proved possible to
obtain MCM-22 zeolite 7, 8, 9 and 10 days of synthesis with high crystallinity and
surface areas. The materials obtained with different days synthesis served as
supports for catalysts 20%Co0,5%RuMCM-22(7D), 20%Co0,5%RuMCM-22(8D)
20%Co0,5%RuMCM-22(9D) e 20%Co0,5%RuMCM-22(10D). After application of the
Fischer-Tropsch reaction, these catalysts showed high selectivity for the formation of
C5+ hydrocarbons, which suggests a high potential of MCM-22 zeolite as a catalyst
support for this reaction.
