On-line version ISSN 1980-5373
REGUERA, Frank Martin et al. The use of niobium based catalysts for liquid fuel production. Mat. Res. [online]. 2004, vol.7, n.2, pp. 343-348. ISSN 1980-5373. http://dx.doi.org/10.1590/S1516-14392004000200021.
The catalytic properties of niobium based catalysts were investigated in the conversion of oleic acid to liquid fuels at atmospheric pressure and at 623 K. The catalytic tests were performed in a fixed bed and continuous flow reactor using an acid to catalyst ratio equal to 4 and N2 as carrier gas. The reaction products were analyzed by gas chromatography and acidity measurements. NH3 temperature programmed desorption, N2 adsorption-desorption (BET method) and Xray diffraction were also performed in order to determine the structural and acidic properties of the catalysts. From the catalytic tests, it was detected the formation of compounds in the range of gasoline, diesel and lubricant oils. Higher catalytic activity and selectivity for diesel fuel were observed for the catalysts NbOPO4 and H3PO4/Nb2O5 that possesses higher acidities and surface areas.
Keywords : niobium; oleic acid; bio-diesel.