Co2+ Ions as Probes of Al Distribution in the Framework of Zeolites. ZSM-5 Study

0181429 - UFCH-W 20020095 RIV GB eng J - Journal Article
Dědeček, Jiří - Kaucký, Dalibor - Wichterlová, Blanka - Gonsiorová, O.
Co2+ Ions as Probes of Al Distribution in the Framework of Zeolites. ZSM-5 Study.
Physical Chemistry Chemical Physics. Roč. 4, - (2002), s. 5406-5413. ISSN 1463-9076. E-ISSN 1463-9084
R&D Projects: GA MŠMT OC D15.20
Institutional research plan: CEZ:AV0Z4040901
Keywords : Al distribution in zeolites * ZSM-5 * Vis spectroscopy
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.838, year: 2002

The occurrence of 'Al pairsö in the framework of ZSM-5 and their spatial distribution in zeolites was estimated by using exchanged Co2+ ions as probes for 'Al pairs'. The Vis spectra of Co2+ ions were employed to monitor the distribution of Co2+ ions, and thus 'Al pairs', among the individual cationic sites, i.e. local framework arrangements at defined positions in the zeolite channels. The effects of concentration of aluminum in the framework and conditions of zeolite synthesis on the presence of 'Al pairs' and their spatial distribution in the ZSM-5 framework were investigated. It has been shown that the distribution of Al atoms in the framework is not controlled by statistic rules, but depends on the conditions of zeolite synthesis and aluminum concentration in the framework.
Permanent Link: http://hdl.handle.net/11104/0078001