Počet záznamů: 1

Control of metal ion species in zeolites by distribution of aluminium in the framework: From structural analysis to performance under real conditions of SCR-NOx and NO, N2O decomposition

  1. 1.
    0358402 - UFCH-W 2012 RIV NL eng J - Článek v odborném periodiku
    Dědeček, Jiří - Čapek, Libor - Sazama, Petr - Sobalík, Zdeněk - Wichterlová, Blanka
    Control of metal ion species in zeolites by distribution of aluminium in the framework: From structural analysis to performance under real conditions of SCR-NOx and NO, N2O decomposition.
    Applied Catalysis A - General. Roč. 391, 1-2 (2011), s. 244-253 ISSN 0926-860X
    Grant CEP: GA AV ČR KAN100400702; GA AV ČR IAA400400904
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: zeolites * Co-BEA * Cu-MFI
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.903, rok: 2011

    The structure, properties and activity of the counter Co, Cu and Fe ion species depending on the distribution of aluminium atoms in the framework between Al pairs of Al-O-(Si-O)(2)-Al sequences in one ring and isolated Al atoms (Al-O-(Si-O)(n>2)-Al sequences) in two rings are analyzed. The effect of the Al distribution on the activity of metal ion species is investigated for reactions of technology importance, i.e. SCR-NOx by propane, and decomposition of NO and N2O under real conditions of NOx streams. Zeolite samples of BEA, MFI and FER structures, of similar composition for each topology, but with basically different distribution of Al atoms in the framework, were either selected from commercial samples or prepared by the developed synthesis. The concentration of Al pairs and isolated Al atoms in the framework was determined by the combination of Si-29 MAS NMR and quantitative analysis of the Vis spectra of dehydrated Co-zeolites with Co(II) ions exchanged to a maximum degree.
    Trvalý link: http://hdl.handle.net/11104/0006396