10/5/15 3 FOSSIL FUEL Photocatalytic CO 2 reduction by H 2 O to form hydrocarbons Photocatalytic conversions
10/5/15 4 PHOTOCATALYSIS Photocatalysis is the catalysis under light irradiation … the acceleration of a photoreaction in the presence of a photocatalyst. Environmental aspects: Wastewater treatment, water disinfection, air cleaning, nti-fogging products, bacteria removing …. Fuel production: Water splitting, CO 2 reduction,… Chemicals production: Oxidation, reduction, …
10/5/15 5 PHOTOCATALYSIS Limiting parameters Conversion (quantum efficacy) Selectivity of the product (over-oxidation & photolysis) Light source (UV vs. visible) Green production of chemicals Applicable in several reactions (oxidation, reduction, cyclization, deamination,.) Environment friendly (less waste, separation,....) Energy saver (ambient condition)
10/5/15 6 I. CONVERSION OF MCH Methyl-cyclohexanone is used as a solvent in making lacquers, varnishes, and plastics; in the leather industry; and as a rust remover. The challenge: design a photocatalyst which * Active * Selective * Visible light sensitive
10/5/15 7 SURFACE TI 3+ CONTAINING (BLUE) TITANIA SYNTHESIS AND CHARACTERIZATION 500 o C
10/5/15 9 PHOTOACTIVITY AT 375 NM UV 1800170016001500140013001200 Absorbance (-) Wavenumber ( cm ) 375 nm Blue P25 Rutile
10/5/15 10 PHOTOACTIVITY AT 425 NM VISIBLE LIGHT
10/5/15 11 RESULTS & CONCLUSIONS Neat blue titania is a more active photocatalyst than either P-25 or commercial rutile titania. Blue titania also shows higher selectivity towards production of ketones. These phenomena are mostly related to a high concentration of surface defect sites (Ti 3+ ), and a relatively low, but still significant affinity for water.
Prof. Dr. Guido Mul Rezvaneh Amorallahi Robert Meijer 10/5/15 12 ACKNOWLEDGEMENT Thank you for your kind attention Questions …..