E. Gianotti et al., A spectroscopic study of group IV transition-metal-incorporated direct templated mesoporous catalysts. Part 2. A comparison of Ti-, Zr- and Hf-containing materials, CATAL LETT, 76(1-2), 2001, pp. 21-26
Ti, Zr and Hf ions have been incorporated into mesoporous silica using a no
vel one-pot procedure based on the true liquid crystal templating (TLCT) sy
nthesis method. The nature of the metallic sites was assessed using diffuse
reflectance UV-visible, photoluminescence and FT-IR spectroscopy. In situ
adsorption of oxygen and ammonia probe molecules provided information on th
e accessibility of optically active species.