摘要
用瞬时应答技术对费托合成的初始态动力学行为进行跟踪,研究了Fe/γ-Al_2O_3,Fe-Co/γ-AL_2O_3和Fe-Co-K_2O/γ-Al_2O_3催化剂上CO氢化生成烃的催化性能和C_2烃的生成机理。结果表明,在Fe-Co-K_2O/γ-A_2O_3上CO解离吸附形成的表面碳是合成烃反应的活性中心,表面碳的逐步氢化,生成亚甲基物种而亚甲基物种的聚合促成了烃链的增长。
In this paper, the kinetic behavior of the initial stage of Fischer-Tropsch Synthesis has been studied by means of transient response technique with quardrupole mass spectrometer. The activity and selectivity of Fe/γ-Al_2O_3, Fe-Co/γ-Al_2O_3 and Fe-Co-K_2O/γ-Al_2O_3 catalysts for CO hydrogenation and the mechanism of C-C bond formation on Fe-Co-K_2O/γ-Al_2O_3 catalyst are examined in detail. It is found that surface carbon produced by CO dissociation is the active centre in the hydrocarbon synthesis, surface carbon subsequently undergoes hydrogenation to form methylene groups which are assumed to polymerize to form C-C chain.
