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The decisive role of the distribution of Al in the framework of beta zeolites on the structure and activity of Co ion species in propane-SCR-NOx in the presence of water vapour
- 1.0357798 - ÚFCH JH 2011 RIV US eng J - Journal Article
Čapek, Libor - Dědeček, Jiří - Sazama, Petr - Wichterlová, Blanka
The decisive role of the distribution of Al in the framework of beta zeolites on the structure and activity of Co ion species in propane-SCR-NOx in the presence of water vapour.
Journal of Catalysis. Roč. 272, č. 1 (2010), s. 44-54. ISSN 0021-9517. E-ISSN 1090-2694
R&D Projects: GA AV ČR KAN100400702; GA AV ČR IAA400400904
Grant - others:EU Network of Excellence IDECAT(XE) NMP 3-CT-2005-011730
Institutional research plan: CEZ:AV0Z40400503
Keywords : Co-beta zeolites * Al distribution * SCR-NOx
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 5.415, year: 2010
The role of the distribution of aluminium in the framework of beta zeolites in the formation of various types of counter Co species of different activity in C3H8-SCR-NO in the absence/presence of 10% water vapour was investigated. Different concentrations of Al atoms in the Al-O-(Si-O)(2)-Al sequences in one ring (Al pairs) and isolated Al atoms in Al-O-(Si-O)(n>2)-Al sequences located in two framework rings of parent BEA* zeolites were obtained by variation of the zeolite synthesis and by post-synthesis dealumination. Al atoms in the framework and their distribution were characterized by the combination of Si-29 MAS NMR of the parent BEA* zeolites and UV-Vis spectroscopy of the maximum-Co(II)-loaded BEA*. The concentration of Al pairs corresponded to the concentration of bare Co(II) ions in dehydrated maximum exchanged-Co(II)-BEA* calculated from the Vis spectra.
Permanent Link: http://hdl.handle.net/11104/0195993
Number of the records: 1