Inorganic complex precursor route for preparation of high-temperature Fischer-Tropsch synthesis Ni-Co nanocatalysts

摘要

The effect of the preparation method on the structural properties and activity of Ni-Co catalysts in the Fischer-Tropsch synthesis has been explored. Impregnation, co-precipitation and a novel method, thermal decompositions of inorganic precursor complex, procedures were applied for the generation of the Ni-promoted alumina- or silica-supported cobalt catalysts. The precursors and the catalysts that were obtained from their calcination were characterized by powder X-ray diffraction, thermal gravimetric analysis, Brunauer-Emmett-Teller specific surface area measurements, scanning electron microscopy and Fourier transform infrared spectroscopy. The catalytic performance in Fischer-Tropsch synthesis was investigated for all calcined catalysts in the temperature interval from 280 to 360 A degrees C. The Ni-Co/Al2O3 catalyst prepared by thermal decomposition of [Ni(H2O)(6)][Co(dipic)(2)]center dot 2H(2)O/Al2O3 as a precursor performed optimally for the conversion of synthesis gas to light olefins. The outcomes revealed that this novel procedure is more advantageous than impregnation and co-precipitation methods for the preparation of effective and durable cobalt catalysts for Fischer-Tropsch synthesis.