Superior pillared clay catalysts for selective catalytic reduction of nitrogen oxides for power plant emission control.
J Air Waste Manag Assoc
; 50(3): 436-42, 2000 Mar.
Article
em En
| MEDLINE
| ID: mdl-10734715
ABSTRACT
Fe(3+)-, Cr(3+)-, Cu(2+)-, Mn(2+)-, Co(2+)-, and Ni(2+)-exchanged Al2O3-pillared interlayer clay (PILC) or TiO2-PILC catalysts are investigated for the selective catalytic reduction (SCR) of nitric oxide by ammonia in the presence of excess oxygen. Fe(3+)-exchanged pillared clay is found to be the most active. The catalytic activity of Fe-TiO2-PILC could be further improved by the addition of a small amount of cerium ions or cerium oxide. H2O and SO2 increase both the activity and the product selectivity to N2. The maximum activity on the Ce-Fe-TiO2-PILC is more than 3 times as active as that on a vanadium catalyst. Moreover, compared to the V2O5-WO3/TiO2 catalyst, the Fe-TiO2-PILC catalysts show higher N2/N2O product selectivities and substantially lower activities (by approximately 85%) for SO2 oxidation to SO3 under the same reaction conditions. A 100-hr run in the presence of H2O and SO2 for the CeO2/Fe-TiO2-PILC catalyst showed no decrease in activity.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Centrais Elétricas
/
Poluição do Ar
/
Silicatos de Alumínio
/
Óxidos de Nitrogênio
Idioma:
En
Revista:
J Air Waste Manag Assoc
Assunto da revista:
SAUDE AMBIENTAL
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Estados Unidos