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Titolo:
The selective catalytic reduction of nitrogen oxides by methane on noble metal-loaded sulfated zirconia
Autore:
Ohtsuka, H;
Indirizzi:
Osakja Gas Co Ltd, Dept Res & Dev, Konohana Ku, Osaka 5540051, Japan Osakja Gas Co Ltd Osaka Japan 5540051 Konohana Ku, Osaka 5540051, Japan
Titolo Testata:
APPLIED CATALYSIS B-ENVIRONMENTAL
fascicolo: 4, volume: 33, anno: 2001,
pagine: 325 - 333
SICI:
0926-3373(20011025)33:4<325:TSCRON>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER-VAPOR; ZEOLITE CATALYSTS; EXCESS OXYGEN; MONOXIDE; NO; PD; PD/H-ZSM-5; ACIDITY;
Keywords:
NOx; reduction; palladium; platinum; sulfated zirconia; methane;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Ohtsuka, H Osakja Gas Co Ltd, Dept Res & Dev, Konohana Ku, 6-19-9 Torishima, Osaka 5540051, Japan Osakja Gas Co Ltd 6-19-9 Torishima Osaka Japan 5540051 , Japan
Citazione:
H. Ohtsuka, "The selective catalytic reduction of nitrogen oxides by methane on noble metal-loaded sulfated zirconia", APP CATAL B, 33(4), 2001, pp. 325-333

Abstract

The selective catalytic reduction of NOx by methane on noble metal-loaded sulfated zirconia (SZ) catalysts was studied. Ru, Rh, Pd, Ag, Ir, Pt, and Au-loaded sulfated zirconia catalysts were compared with the intact sulfatedzirconia. For the NO-CH4-O-2 reaction, Ru, Rh, Pd, Ir, and Pt showed promotion effect on NOx reduction, while for the NO2-CH4-O-2 reaction, only Rh and Pd showed promotion effect. Over intact and Rh, Pd, Ag, and Au-loaded sulfated zirconia, NOx conversion in NO2-CH4-O-2 reaction was significantly higher than that in NO-CH4-O-2 reaction, while clear difference was not observed over Ru, Ir, and Pt-loaded sulfated zirconia. Comparison of [NO2]/([NO] + [NO2]) in the effluent gases in NO-O-2 and NO2-O-2 reactions showed that Ru, Ir, and Pt has high activity for NO oxidation under the reaction conditions. These facts suggest that effects of these metals toward NOx reduction by methane can be categorized into the following three groups: (i) low activity for NO oxidation to NO2, and high activity for NO2 reduction to N-2(Pd, Rh); (ii) high activity for NO oxidation to NO2, and low activity forNO2 reduction to N-2 (Ru, Ir, Pt); (iii) low activity for both reactions (Ag, Au). To confirm these suggestions, combination of these metals were investigated on binary or physically-mixed catalysts. The combination of Pd orRh with Pt or Ru gave high activity for the selective reduction of NOx by methane. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 18:42:31