M. Crocker et al., SULFUR-DIOXIDE AS A CHEMICAL PROBE FOR TITANYL GROUPS IN TITANIUM SILICALITES, Journal of molecular catalysis. A, Chemical, 110(1), 1996, pp. 7-11
The reaction of titanyl (Ti=O) groups with SO2, which for molecular ti
tanyl complexes is found to occur readily at room temperature, has bee
n used to test for the presence of titanyl groups in titanium silicali
te (TS-1) and Ti-MCM-41. Exposure of samples to SO2 does not lead to a
ny reduction in the intensity of the characteristic IR band observed a
t 960 cm(-1) implying that this absorption is not associated with the
presence of titanyl groups.