Synthesis and Catalytic Properties of Eggshell Cobalt Catalysts for the Fischer-Tropsch Synthesis

Studies of Macroporous Structured Alumina Based Cobalt Catalysts for Fischer–Tropsch Synthesis

“…Post et al [5] clearly showed that particles in the size range as normally used in fixedbed reactors can cause serious diffusion limitations leading to low activity and low apparent activation energies. In addition, such limitations will influence the selectivity in the FT synthesis [6][7][8].…”

Effect of Pt Impregnation on a Precipitated Iron-based Fischer–Tropsch Synthesis Catalyst

“…Some other active metals such as group VIII noble metals as promoters for FTS are seldom investigated in iron-based FischerTropsch catalyst system [10][11][12], despite that these metals (Ru, Pd, Re, Pt) are commonly used as promoters for cobalt-based FTS catalysts and have been carefully studied for years. As stated in several literatures, these noble metal promoters facilitate the reduction of cobalt-based FTS catalysts at much lower temperatures, presumably by spillover hydrogen from their surface to cobalt oxide [13][14][15][16][17][18][19]. Holmen et al [16,17] reported that Pt greatly enhanced the reducibility of Co/Al 2 O 3 and Co/SiO 2 , and increased metal dispersion of both Co/Al 2 O 3 and Co/SiO 2 , and increased specific activity of both catalysts for CO hydrogenation at a level of 0.4 wt% Pt, but did not affect FTS hydrocarbon product selectivity.…”

Novel synthesis route for egg-shell, egg-white and egg-yolk type of cobalt on silica catalysts

“…Homogeneous deposition-precipitation may also be used to obtain non-uniform distribution of the catalytically active material over the support [11]. Iglesia et al [12] proposed an alternative route to synthesize egg-shell catalysts by controlling the rate of diffusion of the metal salt solution into the support. This method does not lend itself for the synthesis of alternative distributions of the metal in the catalyst pellet, i.e.…”