This study investigates the effect of the cobalt precursor (nitrate and acetate) on the catalytic performance in the Fischer-Tropsch synthesis of catalysts supported on stabilized CoAl₂O₄/Al₂O₃ pellets. The catalysts are prepared via multi-steps of impregnation of the support with aqueous solutions of cobalt nitrate or acetate followed by calcination in air. The dispersion of the Co₃O₄ obtained via exothermic decomposition of acetate increases if each impregnation is followed by calcination. In fact, halving the calcinations leads to Co₃O₄ particles even bigger than those formed from cobalt-nitrate. A worsening of the catalytic performances is observed when the Co-acetate catalysts are tested in the FTS. Such a result is explained on the basis of Co⁰ particles size effect. Pt improves the catalysts reducibility, regardless of the Co-precursor. The metallic surface area of the Pt-promoted Co-nitrate catalyst is higher than that of the corresponding Co-acetate catalyst, thus resulting in improved catalytic performances.

这项研究调查了钴前体（硝酸盐和乙酸盐）对稳定化CoAl ₂ O ₄ / Al ₂ O ₃颗粒负载的催化剂在费托合成中催化性能的影响。催化剂是通过用硝酸钴或乙酸钴的水溶液浸渍载体，然后在空气中煅烧的多个步骤制备的。如果在每次浸渍之后进行煅烧，则通过乙酸的放热分解而获得的Co ₃ O ₄的分散度增加。实际上，将煅烧减半会导致Co ₃ O ₄甚至比硝酸钴形成的颗粒大。当在FTS中测试共乙酸盐催化剂时，观察到催化性能的恶化。基于Co ⁰粒径效应来解释这种结果。Pt可以提高催化剂的还原能力，而与共母体无关。Pt促进的硝酸钴催化剂的金属表面积高于相应的乙酸钴催化剂的金属表面积，从而提高了催化性能。