Počet záznamů: 1

Transalkylation of toluene with trimethylbenzenes over large-pore zeolites

  1. 1.
    0342472 - UFCH-W 2011 RIV NL eng J - Článek v odborném periodiku
    Krejčí, Andrea - Al-Khattal, S. - Ashraf Ali, M. - Voláková, Martina - Čejka, Jiří
    Transalkylation of toluene with trimethylbenzenes over large-pore zeolites.
    Applied Catalysis A - General. Roč. 377, 1-2 (2010), s. 99-106 ISSN 0926-860X
    Grant CEP: GA AV ČR 1QS400400560
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: transalkylation * toluene * zeolites Beta
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 3.383, rok: 2010

    Zeolites Beta, mordenite and Y were evaluated for their activity in transalkylation reaction of toluene with trimethylbenzenes. Zeolite Beta was found to possess the highest conversion in toluene-trimethylbenzene transalkylation as well as a higher stability in time-on-stream compared with mordenite and zeolite Y. The effect of Si/Al ratio in zeolite Beta was evaluated and it was found that transalkylation activity and xylene yields increase with decreasing Si/Al ratio. Zeolite Beta with the lowest Si/Al ratio of 12.5 (the highest concentration of active sites) exhibited the highest 1,2,4-trimethylbenzene (124TMB) conversion and maximum xylene yield. The highest xylene yield was obtained at optimum equimolar ratio (1:1) of 124TMB to toluene. With increasing 124TMB concentration in the feed, the conversion of 124TMB and xylene yield decreased while toluene conversion simultaneously increased.
    Trvalý link: http://hdl.handle.net/11104/0005867