SANTOS, F. K. G.; http://lattes.cnpq.br/0273000754120553; SANTOS, Francisco Klebson Gomes dos.
Résumé:
Researches in removal sulfur in fuels were developed in the last years due to
the demand for a larger control in emission of automobiles pollutant. With this
purpose, it is looked for develop methodologies to prepare and to characterize
new adsorbents with high capacity on sulfur removal in fuels. Recent works
were proposed to additional sulfur removal in gasoline through adsorption
processes. Such processes are less complex and are based in the principle that
specific adsorbents are capable of selectively capture sulfur compound present
in the effluents of desuiphurization systems. Aluminum oxides and phosphor,
with similar structure of the zeolites, called AIPO, were proposed for the sulfur
compounds adsorption. In the present work AIPO VFI was synthesized and
Impregnations of AIPO with metals (zinc and nickel) form the resulting MeAPOs.
By chemical analyses it was proved that the MeAPOs had the expected metal
content. The thermo gravimetric analysis showed that the template was
removed during crystallization and washing. The performance of AIPO and
MeAPOs as sulfur compounds adsorbents was verified by means of kinetic
studies, using the mixture (cyclohexene/propanetiol). The kinetic study showed
that both materials got to reduce sulfur concentration and MeAPO Zn 7.5%
obtained the best result. The effective diffusion coefficients of propanetiol in
ALPO and MeAPOs were estimated by adjusting the experimental data to the
finite volume Fick's 2n d law solution. The modeling of kinetic data of propanetiol
adsorption was shown satisfactory with standard deviation less than 0.36. The
diffusion coefficients ranged from 0.9 to 3.8 x 10"u m/s.