
TY  - JOUR
A1  - Lim, Yau-Yan 
A1  - MacLachlan, Dugald J. 
A1  - Smith, Thomas D. 
A1  - Jamis, Jim 
A1  - Pilbrow, John R. 
A1  - Song, Ruitian 
T1  - 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
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1997
VL  - 50
IS  - 1
SP  - 53
EP  - 60
KW  - 
UR  - https://doi.org/10.1071/C96093 
N2  - 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. 
ER  -

