TY - JOUR
T1 - Oxidation-Induced Structural Changes in Sub-Nanometer Platinum Supported on Alumina
AU - Moses-DeBusk, Melanie
AU - Allard, Lawrence F.
AU - Blom, Douglas A.
AU - Narula, Chaitanya K.
N1 - Publisher Copyright:
© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
PY - 2015/8/1
Y1 - 2015/8/1
N2 - Pt supported on alumina is an essential component of emission treatment catalysts used in transportation. Theoretical, experimental, and mechanistic aspects of Pt particles supported on a variety of supports have been studied extensively; however, available experimental information on the behavior of single versus sub-nanometer Pt is extremely limited. To bridge the knowledge gap between single supported Pt and well-formed supported Pt nanoparticles, we have performed the synthesis, characterization, and CO and NO oxidation studies of sub-nanometer Pt supported on α-, θ-, and γ-Al2O3 and monitored the changes in structure upon exposure to CO and NO oxidation conditions. We find that sub-nanometer Pt is highly effective for CO oxidation because of the high Pt dispersion, but it is not very efficient as a NO oxidation catalyst. Furthermore, sub-nanometer Pt agglomerates rapidly under CO or NO oxidation conditions to form nanoparticles.
AB - Pt supported on alumina is an essential component of emission treatment catalysts used in transportation. Theoretical, experimental, and mechanistic aspects of Pt particles supported on a variety of supports have been studied extensively; however, available experimental information on the behavior of single versus sub-nanometer Pt is extremely limited. To bridge the knowledge gap between single supported Pt and well-formed supported Pt nanoparticles, we have performed the synthesis, characterization, and CO and NO oxidation studies of sub-nanometer Pt supported on α-, θ-, and γ-Al2O3 and monitored the changes in structure upon exposure to CO and NO oxidation conditions. We find that sub-nanometer Pt is highly effective for CO oxidation because of the high Pt dispersion, but it is not very efficient as a NO oxidation catalyst. Furthermore, sub-nanometer Pt agglomerates rapidly under CO or NO oxidation conditions to form nanoparticles.
KW - aluminum
KW - oxidation
KW - platinum
KW - scanning probe microscopy
KW - supported catalysts
UR - http://www.scopus.com/inward/record.url?scp=84938417295&partnerID=8YFLogxK
U2 - 10.1002/cctc.201500267
DO - 10.1002/cctc.201500267
M3 - Article
AN - SCOPUS:84938417295
SN - 1867-3880
VL - 7
SP - 2391
EP - 2396
JO - ChemCatChem
JF - ChemCatChem
IS - 15
ER -