TY - JOUR
T1 - The effect of the precursor on the characteristics of Co/SiO2 catalysts
AU - Niemelä, M. K.
AU - Krause, A. O.I.
AU - Vaara, T.
AU - Kiviaho, Jari J.
AU - Reinikainen, Matti K.O.
N1 - Funding Information:
This work was supported with funding from the Technology Development Center of Finland. The authors appreciate the analytical assistance of the staff of the Analysis Center of the Helsinki University of Technology.
PY - 1996/12/2
Y1 - 1996/12/2
N2 - The effect of the precursor on the characteristics of the Co/SiO2 catalysts prepared from Co(NO3)2, Co2(CO)8 and Co4(CO)12 was determined. The near-surface reduction was clearly lower for the Co2(CO)8 derived catalyst than for the Co4(CO)12 based one. The hydrogen chemisorption, CO desorption, XRD and XPS measurements indicated that the dispersion of the metallic species decreased in the precursor order Co2(CO)8 > Co4(CO)12 ≫ Co(NO3)2. The TPD studies showed that CO was more strongly adsorbed on catalysts derived from carbonyls than on those based on nitrate, resulting in greater initial activity in CO hydrogenation. In pulsed CO hydrogenation reactions, the selectivity of the Co2(CO)8 derived catalyst differed from the other two. Thus, despite the well documented transformation of the Co2(CO)8 to Co4(CO)12 on the silica support, the supported catalysts derived from these two precursors exhibited distinct characteristics and reactivity.
AB - The effect of the precursor on the characteristics of the Co/SiO2 catalysts prepared from Co(NO3)2, Co2(CO)8 and Co4(CO)12 was determined. The near-surface reduction was clearly lower for the Co2(CO)8 derived catalyst than for the Co4(CO)12 based one. The hydrogen chemisorption, CO desorption, XRD and XPS measurements indicated that the dispersion of the metallic species decreased in the precursor order Co2(CO)8 > Co4(CO)12 ≫ Co(NO3)2. The TPD studies showed that CO was more strongly adsorbed on catalysts derived from carbonyls than on those based on nitrate, resulting in greater initial activity in CO hydrogenation. In pulsed CO hydrogenation reactions, the selectivity of the Co2(CO)8 derived catalyst differed from the other two. Thus, despite the well documented transformation of the Co2(CO)8 to Co4(CO)12 on the silica support, the supported catalysts derived from these two precursors exhibited distinct characteristics and reactivity.
KW - Carbon monoxide hydrogenation
KW - Characterization
KW - Cobalt
KW - Silica support
KW - Synthesis gas
UR - http://www.scopus.com/inward/record.url?scp=0000659807&partnerID=8YFLogxK
U2 - 10.1016/S0926-860X(96)00216-5
DO - 10.1016/S0926-860X(96)00216-5
M3 - Article
AN - SCOPUS:0000659807
VL - 147
SP - 325
EP - 345
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
IS - 2
ER -