Effect of Promoters in Co-Mn-Al Mixed Oxide Catalyst on N2O Decomposition

0343774 - ÚCHP 2011 RIV NL eng J - Článek v odborném periodiku
Karásková, K. - Obalová, L. - Jirátová, Květa - Kovanda, F.
Effect of Promoters in Co-Mn-Al Mixed Oxide Catalyst on N2O Decomposition.
Chemical Engineering Journal. Roč. 160, č. 2 (2010), s. 480-487. ISSN 1385-8947. E-ISSN 1873-3212
Grant CEP: GA ČR GA106/09/1664
Výzkumný záměr: CEZ:AV0Z40720504
Klíčová slova: nitrous oxide * catalytic decomposition * promoter effect
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství
Impakt faktor: 3.074, rok: 2010

Catalytic decomposition of N2O over calcined Co-Mn-Al layered double hydroxide (LDH) modified with slight amount of alkali (Li, Na, K), rare earth (La, Ce), or noble metals (Pd, Pt) was studied. The method of preparation (impregnation, coprecipitation) affected the reducibility of the obtained mixed oxide catalysts but its effect on the surface area (with the exception of a cerium-contained sample) and N2O conversion was less evident. The modification of the Co-Mn-Al mixed oxide with K or Na increased N2O conversion, while no effect or a decrease in the N2O conversion was observed over the other examined catalysts. Alkali metals act as electron promoters; therefore, the differences in catalytic activity may be related to changes of oxygen-transition metal bond strength. The Co-Mn-Al mixed oxides with 1.8 wt% K exhibited a high catalytic activity even under the simultaneous presence of O2, H2O and NOx.
Trvalý link: http://hdl.handle.net/11104/0186171