An experimental study of the improved Fischer?Tropsch synthesis was conducted over a series of Ni-promoted Co/CNT catalysts to investigate the influence of Ni content on the synthesis of liquid hydrocarbon fuel (C5?C20). The catalysts were prepared using the impregnation method and were systematically characterized by N2 physisorption studies, X-ray diffraction, transmission electron microscopy, and hydrogen temperature-programmed reduction. The Ni promoter played a significant role in product distribution. The long-chain hydrocarbons were effectively hydrocracked because of the activity of Ni in C?C bond cleavage. A proper degree of Ni promotion could maximize the production of liquid hydrocarbon fuel. The highest selectivity for liquid hydrocarbon fuel (61.6%) and a CO conversion of 92% were obtained over the 20 wt % Co/CNT catalyst promoted by 0.5 wt % Ni.
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Wang et al. (2013) studied this question.