TY - JOUR
T1 - In situ synthesis and characterization of Ru promoted Co/Al2O3 Fischer-Tropsch catalysts
AU - Li, P.
AU - Liu, Jingyue
AU - Nag, N.
AU - Crozier, Peter
N1 - Funding Information:
This research was conducted in the facilities of the Center for Solid State Science at Arizona State University and was supported by Monsanto Company. The authors also thank Mr. K. Weiss for the maintenance of the Tecnai F-20 ETEM.
PY - 2006/7/3
Y1 - 2006/7/3
N2 - We have conducted a detailed investigation of the initial stages of the formation of metal nanoparticles during the incipient wetness synthesis process for both Co on γ-Al2O3 and Ru-promoted Co on γ-Al2O3 catalysts. The synthesis was performed in the reaction cell of an environmental transmission electron microscope so that the processes can be followed using in situ atomic resolution imaging, Z-contrast imaging and nanospectroscopy. The metal precursors were found to have a highly non-uniform distribution on the alumina support, which leads to a non-uniform distribution of metal particles in the final catalysts. In situ atomic resolution images and electron energy-loss nano-analyses showed that during the reduction process, the metal precursor material transformed into an intermediate phase of cubic CoO. With the addition of Ru, however, in addition to the presence of large CoO particles, small particles of either CoRu or pure Ru were also formed. Our experimental results directly show that the addition of Ru promotes the formation of individual CoRu bimetallic nanoparticles and enhanced the reducibility of small Co particles in the Co(Ru)/γ-Al2O3 systems.
AB - We have conducted a detailed investigation of the initial stages of the formation of metal nanoparticles during the incipient wetness synthesis process for both Co on γ-Al2O3 and Ru-promoted Co on γ-Al2O3 catalysts. The synthesis was performed in the reaction cell of an environmental transmission electron microscope so that the processes can be followed using in situ atomic resolution imaging, Z-contrast imaging and nanospectroscopy. The metal precursors were found to have a highly non-uniform distribution on the alumina support, which leads to a non-uniform distribution of metal particles in the final catalysts. In situ atomic resolution images and electron energy-loss nano-analyses showed that during the reduction process, the metal precursor material transformed into an intermediate phase of cubic CoO. With the addition of Ru, however, in addition to the presence of large CoO particles, small particles of either CoRu or pure Ru were also formed. Our experimental results directly show that the addition of Ru promotes the formation of individual CoRu bimetallic nanoparticles and enhanced the reducibility of small Co particles in the Co(Ru)/γ-Al2O3 systems.
KW - Alumina
KW - Cobalt
KW - Environmental TEM
KW - Fischer-Tropsch synthesis
KW - Promoters
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U2 - 10.1016/j.apcata.2006.03.051
DO - 10.1016/j.apcata.2006.03.051
M3 - Article
AN - SCOPUS:33646849281
VL - 307
SP - 212
EP - 221
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
SN - 0926-860X
IS - 2
ER -