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

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    0343774 - ÚCHP 2011 RIV NL eng J - Journal Article
    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
    R&D Projects: GA ČR GA106/09/1664
    Institutional research plan: CEZ:AV0Z40720504
    Keywords : nitrous oxide * catalytic decomposition * promoter effect
    Subject RIV: CI - Industrial Chemistry, Chemical Engineering
    Impact factor: 3.074, year: 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.
    Permanent Link: http://hdl.handle.net/11104/0186171

     
     
Number of the records: 1