The IR band at 960 cm−1 observed on TS is due to a local stretching mode of a [TiO4] unit in the silicalite framework. Framework Ti does not show Lewis acidity as probed by CO adsorption at 77 K. TiOH and SiOH have undistinguishable IR properties. At 77 K they form with CO very weak 1:1 OH…CO adducts. Small amount of extralattice Ti in form of TiO2 can be probed by CO adsorption at 77 K.
IR Spectra of CO Adsorbed at Low Temperature (77 K) On Titaniumsilicalite, H-ZSM5 and Silicalite
ZECCHINA, Adriano;SPOTO, Giuseppe;BORDIGA, Silvia;
1991-01-01
Abstract
The IR band at 960 cm−1 observed on TS is due to a local stretching mode of a [TiO4] unit in the silicalite framework. Framework Ti does not show Lewis acidity as probed by CO adsorption at 77 K. TiOH and SiOH have undistinguishable IR properties. At 77 K they form with CO very weak 1:1 OH…CO adducts. Small amount of extralattice Ti in form of TiO2 can be probed by CO adsorption at 77 K.
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