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TOWARDS GREEN PRODUCTION OF CHEMICALS: INCREASE SOLAR ABSORPTION WITH BLUE TITANIA NANO-PARTICLES MOHAMED S. HAMDY.

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Presentation on theme: "TOWARDS GREEN PRODUCTION OF CHEMICALS: INCREASE SOLAR ABSORPTION WITH BLUE TITANIA NANO-PARTICLES MOHAMED S. HAMDY."— Presentation transcript:

1 TOWARDS GREEN PRODUCTION OF CHEMICALS: INCREASE SOLAR ABSORPTION WITH BLUE TITANIA NANO-PARTICLES MOHAMED S. HAMDY

2 10/5/15 2 FOSSIL FUEL

3 10/5/15 3 FOSSIL FUEL Photocatalytic CO 2 reduction by H 2 O to form hydrocarbons Photocatalytic conversions

4 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, …

5 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)

6 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

7 10/5/15 7 SURFACE TI 3+ CONTAINING (BLUE) TITANIA SYNTHESIS AND CHARACTERIZATION 500 o C

8 10/5/15 8 ATR-FTIR

9 10/5/15 9 PHOTOACTIVITY AT 375 NM UV Absorbance (-) Wavenumber ( cm ) 375 nm Blue P25 Rutile

10 10/5/15 10 PHOTOACTIVITY AT 425 NM VISIBLE LIGHT

11 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.

12  Prof. Dr. Guido Mul  Rezvaneh Amorallahi  Robert Meijer 10/5/15 12 ACKNOWLEDGEMENT Thank you for your kind attention Questions …..


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