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Oxidation‐Induced Structural Changes in Sub‐Nanometer Platinum Supported on Alumina
Author(s) -
MosesDeBusk Melanie,
Allard Lawrence F.,
Blom Douglas A.,
Narula Chaitanya K.
Publication year - 2015
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201500267
Subject(s) - nanometre , platinum , catalysis , materials science , dispersion (optics) , agglomerate , nanoparticle , chemical engineering , characterization (materials science) , nanotechnology , platinum nanoparticles , redox , chemistry , organic chemistry , metallurgy , composite material , physics , engineering , optics
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‐Al 2 O 3 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.