ABSTRACT
The readsorption and incorporation of reaction products such as 1-alkenes, alcohols, and aldehydes followed by subsequent chain growth is a remarkable property of Fischer-Tropsch (FT) synthesis. Therefore, a large number of co-feeding experiments are discussed in detail in order to contribute to the elucidation of the reaction mechanism. Great interest was focused on co-feeding CH2N2, which on the catalyst surface dissociates to CH2 and dinitrogen. Furthermore, interest was focused on the selectivity of branched hydrocarbons and on the promoter effect of alkali on product distribution. All these effects are discussed in detail on the basis
11.1 Introduction ............................................................................................. 200 11.2 The Bimodal Carbon Number Distribution ............................................. 201 11.3 Co-Feeding Experiments ......................................................................... 202
11.3.1 Co-Feeding of Diazomethane ...................................................... 202 11.3.2 Co-Feeding of Ethene and 1-Alkenes .......................................... 203 11.3.3 Co-Feeding of Alcohols and Aldehydes ...................................... 206
11.4 Synthesis of Branched Hydrocarbons ...................................................... 207 11.5 Development of a Novel Mechanism ....................................................... 208
11.5.1 Formation of CH2 ........................................................................ 208 11.5.2 Mechanism 1 (CH2 Insertion) ...................................................... 209 11.5.3 Mechanism 2 (CO Insertion) ....................................................... 209 11.5.4 Interpretation of the Promoter Effect of Alkali ............................211
