Author:
Lim Yau-Yan,MacLachlan Dugald J.,Smith Thomas D.,Jamis Jim,Pilbrow John R.,Song Ruitian
Abstract
Infrared spectroscopic measurements have been made on hydrocarbons and
hydrogen cyanide adsorbed, separately and competitively, on mesoporous
molecular sieves MCM-41 of all-silica composition and with various
aluminium(III) , titanium(IV) or vanadium(V) contents. Similar i.r.
spectroscopic measurements were made on the porous aluminium phosphates
AlPO4-5 and VPI. Characterization of the cationic
binding sites of MCM-41 has been achieved by comparison of the e.s.r. spectra
of the cationic copper(II) chelate acetylacetonatocopper(II)
tetramethylethylenediamine, adsorbed by MCM-41, and by the sodium ion forms of
zeolite-Y, mordenite, ultrastable and chromatographic grade silica. Both sets
of results show that for mesoporous MCM-41 Brønsted acidity and
possibly cation-exchange sites arise from ill-defined structural defects and
from the silanol groups which are not greatly influenced by the presence of
metal cations within the thick-walled honeycomb structure.
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