Aberration-corrected STEM imaging of Ag on gamma-Al2O3.
Ag on gamma-alumina is a promising catalyst for hydrocarbon selective catalytic reduction in lean-burn gasoline and diesel engines for transportation applications. Although much is known about the mechanism of NOx reduction and the various intermediates, little agreement exists on the nature of the active silver species. In the present work, aberration-corrected STEM has provided new information about the nature of Ag on alumina both as impregnated and following treatments at various temperatures with exposure to simulated exhaust gas. Ex situ techniques have provided new insights into the evolution of Ag on alumina following exposure to temperature and simulated exhaust gas.
Blom
Douglas A
DA
Oak Ridge National Laboratory, Materials Science & Technology Division, Oak Ridge, TN 37831-6064, USA. Doug.Blom@sc.edu
Allard
Lawrence F
LF
Narula
Chaitanya K
CK
Moses-DeBusk
Melanie J
MJ
D000537:Aluminum Oxide / Q000737:chemistry / Q000378:metabolism; D007089:Image Enhancement; D017348:Microscopy, Electron, Scanning Transmission; D012834:Silver / Q000032:analysis* / Q000378:metabolism
D012834:Silver; D000537:Aluminum Oxide