Blom Douglas A, Allard Lawrence F, Narula Chaitanya K, Moses-DeBusk Melanie J
Oak Ridge National Laboratory, Materials Science & Technology Division, Oak Ridge, TN 37831-6064, USA.
Microsc Microanal. 2008 Feb;14(1):98-103. doi: 10.1017/S143192760808015X. Epub 2007 Dec 21.
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.
