TY - JOUR
T1 - Elementary steps in Fischer-Tropsch synthesis
T2 - CO bond scission, CO oxidation and surface carbiding on Co(0001)
AU - Weststrate, C.J.
AU - van Helden, P.
AU - van de Loosdrecht, J.
AU - Niemantsverdriet, J.W.
PY - 2016/6
Y1 - 2016/6
N2 - Dissociation of CO on a Co(0001) surface is explored in the context of Fischer-Tropsch synthesis on cobalt catalysts. Experiments show that CO dissociation can occur on defect sites around 330 K, with an estimated barrier between 90 and 104 kJ mol- 1. Despite the ease of CO dissociation on defect sites, extensive carbon deposition onto the cobalt surface up to 0.33 ML requires a combination of high surface temperature and a relatively high CO pressure. Experimental data on the CO oxidation reaction indicate a high reaction barrier for the CO + O reaction, and it is argued that, due to the rather strong Co-O bond, (i) oxygen removal is the rate-limiting step during surface carbidization and (ii) in the context of Fischer-Tropsch synthesis, removal of surface oxygen rather than CO bond scission might be limiting the overall reaction rate.
AB - Dissociation of CO on a Co(0001) surface is explored in the context of Fischer-Tropsch synthesis on cobalt catalysts. Experiments show that CO dissociation can occur on defect sites around 330 K, with an estimated barrier between 90 and 104 kJ mol- 1. Despite the ease of CO dissociation on defect sites, extensive carbon deposition onto the cobalt surface up to 0.33 ML requires a combination of high surface temperature and a relatively high CO pressure. Experimental data on the CO oxidation reaction indicate a high reaction barrier for the CO + O reaction, and it is argued that, due to the rather strong Co-O bond, (i) oxygen removal is the rate-limiting step during surface carbidization and (ii) in the context of Fischer-Tropsch synthesis, removal of surface oxygen rather than CO bond scission might be limiting the overall reaction rate.
KW - CO dissociation
KW - Co(0001)
KW - Fischer-Tropsch synthesis
KW - Oxygen reduction
KW - Surface carbiding
UR - http://www.scopus.com/inward/record.url?scp=84958260305&partnerID=8YFLogxK
U2 - 10.1016/j.susc.2015.10.050
DO - 10.1016/j.susc.2015.10.050
M3 - Article
AN - SCOPUS:84958260305
SN - 0039-6028
VL - 648
SP - 60
EP - 66
JO - Surface Science
JF - Surface Science
ER -