TY - JOUR
T1 - Bimetallic Pt-Au cluster-derived catalysts for the selective catalytic reduction of NO by propylene
AU - Mihut, Corina
AU - Chandler, Bert D.
AU - Amiridis, Michael D.
N1 - Funding Information:
The authors express their gratitude to the US Department of Energy (DE-FG02-96ER14666) for financial support of this work.
PY - 2002/3
Y1 - 2002/3
N2 - The selective catalytic reduction of nitric oxide by propylene in the presence of excess oxygen has been investigated over a series of silica supported Pt and Pt-Au catalysts. Cluster-derived catalysts were prepared by wet impregnation using a Pt2Au4(C≡C tBu)8 organometallic cluster precursor, and compared to catalysts obtained by incipient wetness impregnation using individual Pt and Au salts. The addition of Au by co-impregnation resulted only to a small shift (20-25°C) in the light-off of propylene towards higher temperatures. A markedly different catalytic behavior was observed in the case of cluster-derived catalysts, where a 150°C delay was observed both in the temperature of maximum NO reduction and the light-off of propylene in the presence and in the absence of NO. Most importantly, the selectivity towards N2 increased by 50% compared to the monometallic Pt catalysts. The results of characterization studies indicate that the monometallic Pt/SiO 2 and the co-impregnated Pt-Au/SiO2 samples have similar metal particle sizes. A more narrow particle size distribution was observed with the cluster-derived bimetallic sample.
AB - The selective catalytic reduction of nitric oxide by propylene in the presence of excess oxygen has been investigated over a series of silica supported Pt and Pt-Au catalysts. Cluster-derived catalysts were prepared by wet impregnation using a Pt2Au4(C≡C tBu)8 organometallic cluster precursor, and compared to catalysts obtained by incipient wetness impregnation using individual Pt and Au salts. The addition of Au by co-impregnation resulted only to a small shift (20-25°C) in the light-off of propylene towards higher temperatures. A markedly different catalytic behavior was observed in the case of cluster-derived catalysts, where a 150°C delay was observed both in the temperature of maximum NO reduction and the light-off of propylene in the presence and in the absence of NO. Most importantly, the selectivity towards N2 increased by 50% compared to the monometallic Pt catalysts. The results of characterization studies indicate that the monometallic Pt/SiO 2 and the co-impregnated Pt-Au/SiO2 samples have similar metal particle sizes. A more narrow particle size distribution was observed with the cluster-derived bimetallic sample.
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U2 - 10.1016/S1566-7367(02)00055-9
DO - 10.1016/S1566-7367(02)00055-9
M3 - Article
AN - SCOPUS:1642377776
SN - 1566-7367
VL - 3
SP - 91
EP - 97
JO - Catalysis Communications
JF - Catalysis Communications
IS - 3
ER -