Bonding geometry and reactivity of methoxy and ethoxy groups adsorbed on powdered TiO2

Article Abstract:

Thermo- and photoreactivities of methoxy (CH3O(a)) and ethoxy groups (C2H5O(a)) bonded, via the oxygen atom, to one Ti ion (monodentate adsorption form) or to two Ti ions (bidentate adsorption form) on TiO2 are studied by Fourier transformed infrared spectroscopy. It is observed that monodentate form has similar thermal stability to bidentate one, however, in the photooxidation in the presence of O2, the decomposition rate of monodentate form is ~1.5 times that of the bidentate form.

Chemistry, Physical and theoretical, Physical chemistry, Titanium compounds, Chemical properties

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Photooxidation of formic acid vs formate and ethanol vs ethoxy on TiO2 and effect of adsorbed water on the rates of formate and formic acid photooxidation

Article Abstract:

Comparison of photooxidation rates of formic acid and formate on TiO2 as well as the effect of adsorbed water on formate and formic acid photodecomposition rates are investigated by Fourier transformed infrared spectroscopy. The result reveals that ethanol is important for the formation of acetaldehyde, while ethoxy groups are photooxidized to adsorbed acetate, formate, and water.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Ethanol, Ethyl Alcohol Manufacturing, Formic Acid, Alcohol, Titanium dioxide, Alcohol, Denatured

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Crotonaldehyde formation from decomposition of IC[H.sub.2]C[H.sub.2]OH on powdered Ti[O.sub.2]

Article Abstract:

A study was conducted on adsorption and reactions of 2-iodoethanol on Ti[O.sub.2] by Fourier transform infrared spectroscopy. IC[H.sub.2]C[H.sub.2]OH decomposes on Ti[O.sub.2] to form crotonaldehyde, which is proposed to result from condensation of two acetaldehyde, accompanied by the increase of hydrogen-bonded surface hydroxy groups.

Industrial Gas Manufacturing, Industrial gases, Hydrogen, Aldehydes, Croton

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