Počet záznamů: 1

The decisive role of the distribution of Al in the framework of beta zeolites on the structure and activity of Co ion species in propane-SCR-NOx in the presence of water vapour

  1. 1.
    0357798 - UFCH-W 2011 RIV US eng J - Článek v odborném periodiku
    Čapek, Libor - Dědeček, Jiří - Sazama, Petr - Wichterlová, Blanka
    The decisive role of the distribution of Al in the framework of beta zeolites on the structure and activity of Co ion species in propane-SCR-NOx in the presence of water vapour.
    Journal of Catalysis. Roč. 272, č. 1 (2010), s. 44-54 ISSN 0021-9517
    Grant CEP: GA AV ČR KAN100400702; GA AV ČR IAA400400904
    Grant ostatní:EU Network of Excellence IDECAT(XE) NMP 3-CT-2005-011730
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: Co-beta zeolites * Al distribution * SCR-NOx
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 5.415, rok: 2010

    The role of the distribution of aluminium in the framework of beta zeolites in the formation of various types of counter Co species of different activity in C3H8-SCR-NO in the absence/presence of 10% water vapour was investigated. Different concentrations of Al atoms in the Al-O-(Si-O)(2)-Al sequences in one ring (Al pairs) and isolated Al atoms in Al-O-(Si-O)(n>2)-Al sequences located in two framework rings of parent BEA* zeolites were obtained by variation of the zeolite synthesis and by post-synthesis dealumination. Al atoms in the framework and their distribution were characterized by the combination of Si-29 MAS NMR of the parent BEA* zeolites and UV-Vis spectroscopy of the maximum-Co(II)-loaded BEA*. The concentration of Al pairs corresponded to the concentration of bare Co(II) ions in dehydrated maximum exchanged-Co(II)-BEA* calculated from the Vis spectra.
    Trvalý link: http://hdl.handle.net/11104/0195993