The acidity of Cr-incorporated Al-MCM-41 nanomaterials was investigated by adsorbing pyridine using transmission infrared spectroscopy.  Both Lewis and Bronsted acid sites were found to be present as determined by corresponding IR modes on surfaces.  Adsorption of acetaldehyde was used a model compound to understand the reactivity of the nanoparticles towards catalytic degradation.  During adsorption at low temperature, the acetaldehyde molecule binds through H-bonding with surface �OH groups.  In addition, a fraction of acetaldehyde adsorbed through Lewis acid sites- Cr (IV) and Al (III).  The combination of both H-bonded and Lewis acid sites bound acetaldehyde underwent condensation reaction forming aldol which then dehydrated at elevated temperature forming 2-butenal.  Acetaldehyde underwent photodecomposition to CO2 during photooxidation at 273 K and 173 K This oxidation involves photoactive acetyl radical and Cr ion.  A variety of condensation products also identified using TPD during photochemical reaction.

Reactivity of chromium anchored Al-MCM-41 nanomaterial: An FT-IR study of detoxification of organic compounds

247th National Meeting (2014)

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