Three-dimensional 10-ring zeolites: The activities in toluene alkylation and disproportionation

0454734 - ÚFCH JH 2017 RIV NL eng J - Článek v odborném periodiku
Kubů, Martin - Žilková, Naděžda - Zones, S. I. - Chen, C.-Y. - Al-Khattaf, S. - Čejka, Jiří
Three-dimensional 10-ring zeolites: The activities in toluene alkylation and disproportionation.
Catalysis Today. Roč. 259, JAN 2016 (2016), s. 97-106. ISSN 0920-5861. E-ISSN 1873-4308
Grant CEP: GA ČR GBP106/12/G015
Institucionální podpora: RVO:61388955
Klíčová slova: 10-ring zeolites * TUN * IMF
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 4.636, rok: 2016

Three-dimensional 10-ring zeolites TUN, IMF, –SVR, MFI and MEL were investigated as for their acid properties, adsorption of 2,2-dimethylbutane and in toluene disproportionation and its alkylation with isopropyl alcohol. The results were compared against zeolite *SFV, the structure of which consists mainly of MEL zeolite with some additional 12-ring channel system. With exception of –SVR synthesized with high Si/Al ratio, all other zeolites provided Si/Al ratios in a narrow region. Novel zeolites TUN, IMF, and –SVR exhibited higher conversions than MFI and MEL in toluene alkylation. TUN and IMF were substantially more active in toluene disproportionation indicating less diffusion restrictions of channel structure on the disproportionation reaction. *SFV showed a similar catalytic behavior to MEL with much lower selectivity to p-xylene and p-cymene. This could indicate that both toluene disproportionation and alkylation proceed in reaction space of *SFV being similar to those of MFI and MEL. *SFV and TUN exhibited much faster adsorption of 2,2-dimethylbutane than MFI, MEL, IMF, and –SVR. It was concluded that the presence of some larger transport pores in *SFV than in other zeolites is responsible for fast adsorption of 2,2-dimethylbutane and transport of products resulting in a low selectivity to p-xylene and p-cymene.

Trvalý link: http://hdl.handle.net/11104/0255362