Active Sites on the Surface of Nano-Sized SiO2–TiO2 Composites
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The nature and amount of active sites on the surface of nano-sized SiO2–TiO2 oxides were studied by FTIR spectroscopy and back-titration methods. Increasing the TiO2 content in the SiO2–TiO2 composites increased the amount of activated surface H2O and adsorbed CO2. This increased the amount of active basic centers on the oxide surface and caused the first of two observed mechanisms for benzaldehyde adsorption (with and without its activation) to begin to prevail.
KeywordsSiO2–TiO2 composite nano-sized oxide sol–gel method active site heterogeneous catalysis adsorption back-titration method
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