0181475 - UFCH-W 20020143 RIV NL eng J - Journal Article
Prokopová, Olga - Kočiřík, Milan - Zikánová, Arlette - Bernauer, B. - Dalmon, J. A. - Miachon, S.
A Comparative Study of Template Removal from Silicate-1 Crystals in Pyrolytic and Oxidizing Regimes.
Microporous and Mesoporous Materials. Roč. 55, č. 3 (2002), s. 285-296. ISSN 1387-1811. E-ISSN 1873-3093
R&D Projects: GA ČR GA203/99/0522
Institutional research plan: CEZ:AV0Z4040901
Keywords : silicalite-1 * N2 sorption * template
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.990, year: 2002

The removal of tetrapropylammonium cations (TPA+) from silicalite-1 crystals with a morphology of 90.DEG.-intergrowth and different crystal sizes was investigated. The effects of the nature of the gas (air or nitrogen) and of the hydrodynamics were examined using a stream flowing in parallel or across the crystal layer. The only process variable was the plateau temperature (Tmax). Crystal domain boundaries became permeable to template degradation products when Tmax exceeded 300 .DEG.C. The template removal was monitored by (i) light microscopy, (ii) degree of removal of the total organics , of nitrogen species N and of carbon species C and (iii) accessibility of the channel system for N2 molecules. The sorption isotherms for N2 exhibited two steps. The upper step started to be perceptible for a degree of organic removal higher than 55
Permanent Link: http://hdl.handle.net/11104/0078039