TY - JOUR
T1 - Preparation and characterization of supported bimetallic Pt-Au and Pt-Cu catalysts from bimetallic molecular precursors
AU - Chandler, Bert D.
AU - Schabel, Alexander B.
AU - Pignolet, Louis H.
N1 - Funding Information:
We thank professors Zoltán Páal and M. Albert Vannice for their helpful discussions regarding the new catalysts. This research was funded by a grant from the University of Minnesota Graduate School. A.B.S. was a participant in an NSF-REU program in the Department of Chemistry at the University of Minnesota.
PY - 2000/7/25
Y1 - 2000/7/25
N2 - Silica-supported bimetallic Pt-Cu and Pt-Au catalysts were prepared using bimetallic molecular cluster precursors as the metal source to study the effects of added metal and precursor type on catalyst activity, selectivity, and structure. The molecular precursors were adsorbed on the support from an organic solvent, dried under vacuum, calcined under flowing oxygen, and reduced with hydrogen. The catalytic performance was assessed with hexane conversion reaction. The new catalysts were compared with conventionally prepared Pt and Pt-Cu catalysts, e.g., via wetness impregnation or coimpregnation, that were subjected to similar activation conditions. Both the 0.15-Pt2Au4 and 0.15-Pt2Cu4 catalysts had enhanced selectivity for the production of lighter hydrocarbons (cracking) and decreased activity for nondestructive alkane reforming and dehydrocyclization reactions. The diffuse reflectance FTIR spectra of CO adsorbed to the 0.15-Pt2Cu4 catalyst contained a very wide and asymmetric peak associated with CO bound to platinum. The differences in activity for skeletal rearrangements could be explained in terms of the cyclic mechanism of isomerization and supported the characterization data that very small and bimetallic particles are prepared using the cluster precursors.
AB - Silica-supported bimetallic Pt-Cu and Pt-Au catalysts were prepared using bimetallic molecular cluster precursors as the metal source to study the effects of added metal and precursor type on catalyst activity, selectivity, and structure. The molecular precursors were adsorbed on the support from an organic solvent, dried under vacuum, calcined under flowing oxygen, and reduced with hydrogen. The catalytic performance was assessed with hexane conversion reaction. The new catalysts were compared with conventionally prepared Pt and Pt-Cu catalysts, e.g., via wetness impregnation or coimpregnation, that were subjected to similar activation conditions. Both the 0.15-Pt2Au4 and 0.15-Pt2Cu4 catalysts had enhanced selectivity for the production of lighter hydrocarbons (cracking) and decreased activity for nondestructive alkane reforming and dehydrocyclization reactions. The diffuse reflectance FTIR spectra of CO adsorbed to the 0.15-Pt2Cu4 catalyst contained a very wide and asymmetric peak associated with CO bound to platinum. The differences in activity for skeletal rearrangements could be explained in terms of the cyclic mechanism of isomerization and supported the characterization data that very small and bimetallic particles are prepared using the cluster precursors.
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U2 - 10.1006/jcat.2000.2905
DO - 10.1006/jcat.2000.2905
M3 - Article
AN - SCOPUS:0034713731
SN - 0021-9517
VL - 193
SP - 186
EP - 198
JO - Journal of Catalysis
JF - Journal of Catalysis
IS - 2
ER -