RODRIGUES, J. J.; http://lattes.cnpq.br/7306786811408456; RODRIGUES, Jocielys Jovelino.
Résumé:
The introduction of ruthenium as a promoter emerges as a promising alternative for
reduce cobalt oxide particles much more easily, increase the
cobalt dispersion and inhibit catalyst deactivation. Therefore, this
The objective of this work is to prepare the molecular sieve SBA-15 using
different heating methods and to evaluate in the Fischer-Tropsch reaction the
20% Co / SBA-15 (conventional), 20% Co / SBA-15 (microwave) catalysts and
0.5% Ru20% Co / SBA-15 (conventional). The catalysts were prepared by
wet impregnation using SBA-15 molecular sieves as support. At
SBA-15 molecular sieve, conventional and microwave methods, was impregnated with
cobalt through the aqueous cobalt nitrate. Following was
incorporated the ruthenium promoter using chloride solution. The samples were
characterized by DRX, EDX, ATD, RTP, SEM and physical adsorption of N2. The reaction of
Fischer-Tropsch was conducted at 240 ° C, 20 bar pressure using a
molar H2 / CO = 1 in a mud bed reactor during a reaction time of 8 h. THE
obtaining the mesoporous molecular sieve, SBA-15 by the heating methods
conventional and microwave energy can be confirmed by diffractograms
X-ray, highlighting the SBA-15 obtained with short crystallization times
by the microwave energy heating method. The surface areas
Specific pores decrease and pore volume varies due to pore blockage by the
cobalt and the ruthenium promoter, but the structure of the SBA-15 molecular sieve is not
amended. The RTP profiles of the Co / SBA-15 and Ru / Co / SBA-15 series catalysts
allowed to verify the presence of distinct peaks that can be caused by the
cobalt dispersion. The results obtained from Fischer-Tropsch synthesis
catalysts showed high selectivity to high (C5 +) hydrocarbons.
added value, as well as the co-impregnation of the ruthenium promoter.
catalyst Co / SBA-15 (conventional method) favored the increase of
selectivity for C5 + hydrocarbons. The catalysts under study presented
high selectivity at C5 + higher than selectivity of commercial catalysts
supported on silica reported by the literature.