Confinements on growth sites are recognized as essential principle of Fischer-Tropsch synthesis. Chain branching is sensitive against chain size. Similarities between FT-growth-sites and homogeneous pincer-complex catalysts are realized.

In house developed methods for time resolved investigation of activity and selectivity are applied. An advanced ASF-model is defined, and on this basis probabilities of branching are calculated from experimental product distributions. Chain-length dependence in branching is quantified as branching pattern. Confinements on branching are studied for iron- and cobalt catalyst at varied CO partial pressure and during catalyst restructuring.

With cobalt, FT-growth sites are observed as of dynamic nature, CO being involved. With iron, growth sites are stable, even during catalyst carbiding. The basic parameter to constitute a FT-growth site, be it on iron or cobalt, are specific confinements, regardless of differences in chemical or structural nature. Results and discussion of this work are aiming at disclosing the miracle of “gasoline synthesis from CO + H₂ at normal pressure”, invented by Franz Fischer and Hans Tropsch, as the methylene insertion on homogeneous-complex-alike sites on the catalyst surface.

限制在生长位点上是费-托合成的基本原理。链分支对链大小敏感。实现了FT生长位点和均相夹钳复杂催化剂之间的相似性。

内部开发了用于时间分辨的活性和选择性研究的方法。定义了高级ASF模型，并在此基础上根据实验产品分布计算了分支的概率。分支中的链长依赖性被量化为分支模式。研究了在变化的CO分压下和催化剂重构过程中铁钴催化剂的支化范围。

对于钴，观察到FT生长点具有动态性质，其中涉及CO。使用铁，即使在催化剂碳化期间，生长位点也是稳定的。不管是在化学性质还是结构性质上，构成FT生长位点的基本参数（无论是在铁还是钴上）都是特定的限制。这项工作的结果和讨论的目的是揭示由Franz Fischer和Hans Tropsch发明的“常压下由CO + H ₂合成汽油”的奇迹，作为亚甲基插入到催化剂表面均相，复杂位置的现象。