Počet záznamů: 1

Low-temperature thermal removal of template from high silica ZSM-5. Catalytic effect of zeolitic framework

  1. 1.
    0348362 - UFCH-W 2011 RIV NL eng J - Článek v odborném periodiku
    Jirka, Ivan - Sazama, Petr - Zikánová, Arlette - Hrabánek, Pavel - Kočiřík, Milan
    Low-temperature thermal removal of template from high silica ZSM-5. Catalytic effect of zeolitic framework.
    Microporous and Mesoporous Materials. Roč. 137, 1-3 (2011), s. 8-17 ISSN 1387-1811
    Grant CEP: GA ČR GA203/07/1443
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: TPA+ decomposition * spatial distribution of organics * Al, Fe dopants
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.285, rok: 2011

    Topochemical and catalytic effects of ZSM-5 zeolite framework in the course of thermal degradation of tetrapropyl ammonium (TPA+) template upon calcination under oxidative (air) and inert (nitrogen, N2) atmosphere was analyzed using elemental analysis, X-ray Photoelectron Spectroscopy (XPS) and absorption UV–Vis–NIR spectroscopy. It has been demonstrated that template residues were selectively removed from the interior of the crystals. The concentration of (N (C)-containing template species was less-than-or-equals, slant1 atom per unit cell (u.c.)) by prolonged (24 h) calcination in air already at temperature Tmax = 310 °C (N-containing template species) and Tmax = 330 °C (C-containing template species). Calcination in N2 requires temperatures higher by about 20 °C. The surface region of ZSM-5 crystals contained, however, a substantial amount of template residua (20–30% of N-containing and not, vert, similar60% of C-containing species) even at Tmax = 430 °C.
    Trvalý link: http://hdl.handle.net/11104/0188914