
%0 Journal Article
%A Lim, Yau-Yan 
%A MacLachlan, Dugald J. 
%A Smith, Thomas D. 
%A Jamis, Jim 
%A Pilbrow, John R. 
%A Song, Ruitian 
%T A Study of the Active Sites of the Mesoporous Molecular Sieve MCM-41 and Related Zeolitic Materials by Using Fourier-Transform I.R., Continuous-Wave E.S.R. and Pulsed E.S.R. Spectroscopic Probes
%J Australian Journal of Chemistry
%D 1997/03/05
%V 50
%N 1
%P 53-60
%K 
%R https://doi.org/10.1071/C96093
%U https://www.publish.csiro.au/paper/C96093 
%X 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 Br&oslash;nsted 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. 
