Abstract
Highly ordered mesoporous Al–SBA-15 materials with high Al/Si ratios (0.2, 0.5 and 1.0) have been synthesized by a modified “pH-adjusting” method, and ruthenium catalysts supported on the Al–SBA-15 were prepared by incipient wetness impregnation and tested in a fixed bed reactor at high temperature (250 °C) in order to study their bifunctional catalytic performance in Fischer–Tropsch synthesis. The samples were characterized by ICP-AES, XRD, 27Al MAS NMR, N2 physisorption, NH3-TPD, TEM, TPR and IR spectroscopy of adsorbed pyridine. The results showed that the selectivities of hydrocarbons were significantly influenced by Al/Si ratio in the support. The 4Ru(1.0) catalyst with Al/Si ratio of 1.0 exhibited typical bifunctional properties in Fischer–Tropsch synthesis, lower selectivity (24.9%) of heavy hydrocarbons (C13+) and much higher selectivities of olefins and iso-paraffins were found in the products.
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