465
2.2 Alkenyl Mechanism
In an alternative pathway to predict the olefin formation in the Fischer-Tropsch
synthesis, Maitlis and co-workers [27–29] proposed negating the sp
3
–sp
3
coupling
of methylene species with methyl species as suggested in the “alkyl”-mechanism.
The initial activation of CO is similar to the alkyl mechanism where carbon monoxide transforms into CH– surface species (Fig. 4). The vinyl group (CH=CH 2 ) is
considered as a chain initiator, which is assumed to be formed through the connection of methylidyne (≡CH) and methylene (=CH 2 ). As the chain reaction proceeds,
a surface allyl species (–CH 2 CH=CH 2 ) forms via coupling of a methylene species
Fig. 3 Alkyl mechanism
Recent Advancements and Detailed Understanding of Kinetics for Synthesis Gas…
2.2 Alkenyl Mechanism
In an alternative pathway to predict the olefin formation in the Fischer-Tropsch
synthesis, Maitlis and co-workers [27–29] proposed negating the sp
3
–sp
3
coupling
of methylene species with methyl species as suggested in the “alkyl”-mechanism.
The initial activation of CO is similar to the alkyl mechanism where carbon monoxide transforms into CH– surface species (Fig. 4). The vinyl group (CH=CH 2 ) is
considered as a chain initiator, which is assumed to be formed through the connection of methylidyne (≡CH) and methylene (=CH 2 ). As the chain reaction proceeds,
a surface allyl species (–CH 2 CH=CH 2 ) forms via coupling of a methylene species
Fig. 3 Alkyl mechanism
Recent Advancements and Detailed Understanding of Kinetics for Synthesis Gas…