Acid and redox activity of template-free Al-rich H-BEA* and Fe-BEA* zeolites

0432631 - ÚFCH JH 2015 RIV US eng J - Článek v odborném periodiku
Sazama, Petr - Wichterlová, Blanka - Sklenák, Štěpán - Parvulescu, V. I. - Candu, N. - Sádovská, Galina - Dědeček, Jiří - Klein, Petr - Pashkova, Veronika - Šťastný, Petr
Acid and redox activity of template-free Al-rich H-BEA* and Fe-BEA* zeolites.
Journal of Catalysis. Roč. 318, OCT 2014 (2014), s. 22-33. ISSN 0021-9517. E-ISSN 1090-2694
Grant CEP: GA ČR GAP106/11/0624; GA ČR(CZ) GA14-10251S; GA TA ČR TA01021377
Institucionální podpora: RVO:61388955
Klíčová slova: Acid strength * Alkylation of aromatics * Beta zeolite
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 6.921, rok: 2014

Al-rich template-free BEA* zeolite (Si/Al 4.6) was synthesized and its structure was analyzed in comparison with the conventional H-BEA* zeolite of Si/Al 11.3 using XRD, N2 sorption, SEM, FTIR, 27Al 3Q and 29Si MAS NMR spectroscopy, and DFT calculation of the deprotonation energies. The Al-rich H-BEA* exhibited a high concentration of Brønsted and Lewis sites, both of high acid strength, although AlSiAl sequences were present in the framework. In Al-rich Fe-BEA* the exchanged Fe ions, Fe-oxo species, and Fe-oxo oligomers were identified by UV-vis spectroscopy. Cracking of n-decane, alkylation of benzene with benzyl alcohol and hydroamination of styrene with aniline to (anti)Markovnikov phenyl-[2-phenylethyl]amine over H-BEA *, and decomposition of N2O and NH 3-SCR-NOx over Fe-BEA* were investigated in relation to the concentration and nature of acid and Fe-redox sites. The high concentration of Al-related active sites and the highly regular structure of Al-rich beta zeolite are directly manifested in enhanced activity compared with conventional Si-rich beta zeolite.
Trvalý link: http://hdl.handle.net/11104/0237008