Počet záznamů: 1

Post-synthesis modification of TUN zeolite: Textural, acidic and catalytic properties

  1. 1.
    0359894 - UFCH-W 2012 RIV NL eng J - Článek v odborném periodiku
    Kubů, Martin - Žilková, Naděžda - Čejka, Jiří
    Post-synthesis modification of TUN zeolite: Textural, acidic and catalytic properties.
    Catalysis Today. Roč. 168, č. 1 (2011), s. 63-70 ISSN 0920-5861
    Grant CEP: GA ČR GD203/08/H032; GA ČR GAP106/11/0819
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: TUN * dealumination * desilication
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.407, rok: 2011

    Dealumination, desilication and silylation of TUN zeolite was investigated and related to the catalytic behavior in toluene disproportionation and its alkylation with isopropyl alcohol. Only negligible concentration of acid sites was identified on the “external” surface of parent TUN zeolite and this concentration increased with increasing desilication. Silylation resulted in channel narrowing and probably some plugging. As a result, significant increase in the para-selectivity in toluene disproportionation and its alkylation with isopropyl alcohol was achieved. No changes in toluene conversion were observed for all parent and modified samples in toluene alkylation confirming diffusion and transport of products as the rate determining step in 10-ring zeolites. Selectivity to cymenes and p-cymene decreased with dealumination as well as desilication. In contrast, silylation increased both cymene (80%) and p-cymene (90%) selectivity in toluene alkylation.
    Trvalý link: http://hdl.handle.net/11104/0197587