Síntese de catalisadores (Co/SBA-15) utilizados na reação de Fisher-Tropsch.

Abstract

Technology GTL (Gas to Liquid), which allows to obtain derivatives oil directly from natural gas, has attracted attention due to scarcity of oil and abundant natural gas reserves. Step middle of this process is known as Fischer-Tropsch Synthesis and consists in the hydrogenation of carbon monoxide, using metal catalysts, depending on the desired product. In the case of diesel, the most widely used is cobalt. But for a more selective the long-chain hydrocarbons, producing methane and at least using the least amount of metal catalysts must have a good metallic dispersion, which could be achieved using molecular sieves as support. This work aimed to synthesize catalysts containing 5wt%, 10wt%, 15wt% and 20wt% cobalt supported on SBA-15 molecular sieve, to verify the effect of structure on performance in the Fischer-Tropsch Synthesis. The catalysts obtained were calcined at 450 ° C for 4 hours, and characterized by characterized by X-Ray Diffraction (XRD), Spectrometer Energy Dispersive X-ray (XED), physical adsorption N2 and Scanning Electron Microscopy (SEM). The XED analysis indicated the presence of cobalt oxide. The diffraction patterns showed that the impregnation process and calcination did not cause changes in the structure of the mesoporous support. The results of physical adsorption of N2 samples reveal the presence of mesopores. The hydrogenation reactions of CO to produce hydrocarbons (Fischer-Tropsch synthesis) was carried out in a slurry reactors reactor (PARR model 4571) system with magnetic stirring and nominal volume of 500 ml. The results obtained from the Fischer-Tropsch synthesis catalysts showed high selectivities for the hydrocarbons C 5 + high-value.