"[AC549F45CEC2]" . . "Wallenberg, L. R." . "Analysis of the state and size of silver on alumina in effective removal of NOx from oxygen rich exhaust gas"@en . "Klingstedt, F." . "465013" . "4"^^ . . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . "Anal\u00FDza stavu a velikosti st\u0159\u00EDbrn\u00FDch sp\u00E9ci\u00ED na alumin\u011B p\u0159i efektivn\u00EDm odstra\u0148ov\u00E1n\u00ED NOx z kysl\u00EDkem bohat\u00FDch v\u00FDfukov\u00FDch plyn\u016F"@cs . "Ag/alumina catalysts with different silver contents for octane-SCR were prepared by impregnation and incipient wetness methods. Activity tests revealed that the decisive factor for high activity is not only a high dispersion of silver, but also the ability of the system to redisperse clustered silver. Determination of dispersion by TEM/HAADF and O-2-chemisorption experiments resulted in values close to each other even if the results were not directly comparable. This is suggested to be due to not complete silver reduction below 700 degrees C and the samples being very heterogeneous in terms of particle size, e.g., having a bimodal size distribution. Small charged Ag-n(.delta.+) clusters containing 2-8 silver atoms highly prevailed in the samples containing < 2 wt% Ag and exhibiting high octane-SCR activity In highly loaded Ag/alumina samples or those reduced and reoxidized at high temperature (> 400 degrees C), large metallic particles are stabilized, resulting ..."@en . "Sobal\u00EDk, Zden\u011Bk" . "RIV/61388955:_____/06:00076183" . "Analysis of the state and size of silver on alumina in effective removal of NOx from oxygen rich exhaust gas"@en . . "RIV/61388955:_____/06:00076183!RIV07-AV0-61388955" . "Arve, K." . . "Journal of Nanoscience and Nanotechnology" . . "Analysis of the state and size of silver on alumina in effective removal of NOx from oxygen rich exhaust gas" . "\u010Capek, Libor" . "6" . "Wichterlov\u00E1, Blanka" . "Er\u00E4nen, K." . . . "D\u011Bde\u010Dek, Ji\u0159\u00ED" . . . "Svennerberg, K." . "1533-4880" . . . "Bovin, J.-O." . "8"^^ . "P(1ET400400413), Z(AV0Z40400503)" . . . . . . . . "silver; exhaust gas; removal of NOx"@en . . "Murzin, D. Yu." . "1076;1083" . . "Anal\u00FDza stavu a velikosti st\u0159\u00EDbrn\u00FDch sp\u00E9ci\u00ED na alumin\u011B p\u0159i efektivn\u00EDm odstra\u0148ov\u00E1n\u00ED NOx z kysl\u00EDkem bohat\u00FDch v\u00FDfukov\u00FDch plyn\u016F"@cs . "Ag/aluminov\u00E9 katalyz\u00E1tory pro SCR oktanem s r\u016Fzn\u00FDm obsahem st\u0159\u00EDbra byly p\u0159ipraveny impregnac\u00ED a vlh\u010Den\u00EDm. Parametrem rozhoduj\u00EDc\u00EDm o vysok\u00E9 aktivit\u011B katalyz\u00E1toru nen\u00ED podle katalytick\u00FDch test\u016F pouze disperze st\u0159\u00EDbra, ale tak\u00E9 schopnost syst\u00E9mu redispergovat st\u0159\u00EDbrn\u00E9 klastry. Disperze st\u0159\u00EDbra, ur\u010Den\u00E1 metodou TEM/HAADF a chemisorpc\u00ED kysl\u00EDku vykazovala bl\u00EDzk\u00E9 hodnoty i pro rozd\u00EDln\u011B aktivn\u00ED vzorky. To je zp\u016Fsobeno ne\u00FAplnou redukc\u00ED st\u0159\u00EDbra p\u0159i teplot\u011B pod 700\u00BA C a velkou nehomogenitou velikosti \u010D\u00E1stic vykazuj\u00EDc\u00ED bimod\u00E1ln\u00ED distribuci. Ve vzorc\u00EDch obsahuj\u00EDc\u00EDch < 2 % Ag a vykazuj\u00EDc\u00EDch vysokou aktivitu v SCR oktanem v\u00FDrazn\u011B p\u0159eva\u017Eovalo st\u0159\u00EDbro ve form\u011B mal\u00FDch, parci\u00E1ln\u011B nabit\u00FDch klastr\u016F z 2-8 atom\u016F st\u0159\u00EDbra. Ve vzorc\u00EDch Ag/aluminy s vysok\u00FDm obsahem st\u0159\u00EDbra nebo redukovan\u00FDch a reoxidovan\u00FDch za vysok\u00E9 teploty (> 400\u00BA C) vznikaj\u00ED velk\u00E9 stabiln\u00ED kovov\u00E9 Ag \u010D\u00E1stice, kter\u00E9 zp\u016Fsobuj\u00ED n\u00EDzkou konverzi NOx na N2."@cs . "4" . "11"^^ . "Analysis of the state and size of silver on alumina in effective removal of NOx from oxygen rich exhaust gas" . "Ag/alumina catalysts with different silver contents for octane-SCR were prepared by impregnation and incipient wetness methods. Activity tests revealed that the decisive factor for high activity is not only a high dispersion of silver, but also the ability of the system to redisperse clustered silver. Determination of dispersion by TEM/HAADF and O-2-chemisorption experiments resulted in values close to each other even if the results were not directly comparable. This is suggested to be due to not complete silver reduction below 700 degrees C and the samples being very heterogeneous in terms of particle size, e.g., having a bimodal size distribution. Small charged Ag-n(.delta.+) clusters containing 2-8 silver atoms highly prevailed in the samples containing < 2 wt% Ag and exhibiting high octane-SCR activity In highly loaded Ag/alumina samples or those reduced and reoxidized at high temperature (> 400 degrees C), large metallic particles are stabilized, resulting ..." .