Catalytic applications and FTIR investigation of zeolite SSZ-33 after isomorphous substitution

0430102 - ÚFCH JH 2015 RIV NL eng J - Článek v odborném periodiku
Vitvarová, Dana - Kurfiřtová, Lenka - Kubů, Martin - Žilková, Naděžda
Catalytic applications and FTIR investigation of zeolite SSZ-33 after isomorphous substitution.
Microporous and Mesoporous Materials. Roč. 194, AUG 2014 (2014), s. 174-182. ISSN 1387-1811. E-ISSN 1873-3093
Grant CEP: GA ČR GAP106/11/0819
Institucionální podpora: RVO:61388955
Klíčová slova: SSZ-33 * acidity * toluene alkylation
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 3.453, rok: 2014

Zeolite SSZ-33 (topology: CON, borosilicate as-synthesized) contains access to the internal void spaces via 10- and 12-ring pores. Borosilicate SSZ-33 was transformed by isomorphous substitution to Al, Ga and Fe form. The acid sites of zeolite samples were investigated using infrared spectroscopy. The different probes (d(3)-acetonitrile, pivalonitrile, pyridine and 2,6-di-tert-butyl-pyridine) were used in this study. Bronsted acidity confirms the isomorphous substitution of B by Al, Ga and Fe in the SSZ-33 framework. It was found that the strength of Bronsted acid sites of zeolites under study decreased in the series: [Al]-SSZ-33 > [Ga]-SSZ-33 > [Fe]-SSZ-33. Upon adsorption of 2,6-di-tert-butyl-pyridine a part of Bronsted acid sites was not accessible (51% [Al]-SSZ-33, 76% [Ga]-SSZ-33 and 78% [Fe]-SSZ-33). The catalytic performance was studied in toluene disproportionation and toluene alkylation with isopropyl alcohol. Toluene conversions decreased in the order: [Al]-SSZ-33 > [Ga]-SSZ-33 > [Fe]-SSZ-33 in all tested reactions. Selectivities to sum of xylene isomers in toluene disproportionation was as follows: [Al]-SSZ-33 > [Ga]-SSZ-33 > [Fe]-SSZ-33. Zeolite [Al]-SSZ-33 and [Fe]-SSZ-33 exhibited the highest ratio xylene/benzene 0.75. In the case of toluene alkylation, the highest selectivities to cymenes were achieved over [Fe]-SSZ-33 and [Ga]-SSZ-33 at 200 degrees C. In the case of [Fe]-SSZ-33 almost no n-propyltoluene was found in the reaction mixture.
Trvalý link: http://hdl.handle.net/11104/0235097