The surface properties of MCM-41 samples with Si/Al ratio congruent to 20 and pore diameter congruent to 4 nm, with 1%, 5% and 10% (w/w) Cu(2)O/MCM41 ratios, were studied by FTIR spectroscopy, at congruent to 100K using CO as probe molecule. At low copper content, atomically dispersed Cu(I) ions, anchored to the framework, are predominant (like in Cu(I)-ZSM5). These coordinatively unsaturated ions can coordinate up to three CO molecules. At higher copper concentrations, Cu(2)O particles are progressively formed: consequently besides the spectral features due to isolated Cu(I) species, the spectroscopic manifestations associated with surface atoms of Cu(2)O microparticles are observed.
Surface properties of Cu2O/MCM41 mesoporous system
ZECCHINA, Adriano;SCARANO, Domenica;SPOTO, Giuseppe;BORDIGA, Silvia;LAMBERTI, Carlo;
1998-01-01
Abstract
The surface properties of MCM-41 samples with Si/Al ratio congruent to 20 and pore diameter congruent to 4 nm, with 1%, 5% and 10% (w/w) Cu(2)O/MCM41 ratios, were studied by FTIR spectroscopy, at congruent to 100K using CO as probe molecule. At low copper content, atomically dispersed Cu(I) ions, anchored to the framework, are predominant (like in Cu(I)-ZSM5). These coordinatively unsaturated ions can coordinate up to three CO molecules. At higher copper concentrations, Cu(2)O particles are progressively formed: consequently besides the spectral features due to isolated Cu(I) species, the spectroscopic manifestations associated with surface atoms of Cu(2)O microparticles are observed.
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