Gas-phase Photocatalytic Partial Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone on Au/TiO2 Photocatalysts
-
D. Sannino
,
V. Vaiano
Abstract
The heterogeneous photocatalytic partial oxidation of cyclohexane in gas-phase as an alternative green process for fine chemicals synthesis was successfully achieved on Au/TiO2 photocatalysts prepared by photodeposition technique. Different gold loadings ranging between 0.5 and 2 wt.% of photodeposited Au on TiO2 synthesized by sol-gel method were obtained by changing the concentration of gold precursor at fixed illumination intensity and time. The cyclohexane partial photoxidation was conducted in a gas-solid photocatalytic fluidized bed reactor at high illumination efficiency. Main observed reaction products were cyclohexanol, cyclohexanone and CO2. The resulting selectivity was dramatically influenced by the gold content. The reaction temperature was a critical parameter to reach the photocatalysts stability, avoiding deactivation phenomena while the tuning of Au content of the photocatalysts, resulted in the promotion of the formation of cyclohexanol or cyclohexanone with high selectivity. In particular, by increasing Au content, the process selectivity is completely reversed, passing from high cyclohexanol selectivity (75%) to high selectivity to cyclohexanone (80%). These promising results evidenced that Au/TiO2 catalysts in the selected operating conditions, are effective materials for the synthesis of cyclohexanone and cyclohexanol in gas-phase by photocatalysis, at very low reaction temperatures and without the additional step of catalyst recovering needed in the liquid partial oxidation of cyclohexane.
© 2016 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Electrochemical Inactivation of P. Aeruginosa, A. hydrophila, L. pneumophila using Boron Doped Diamond Anodes
- Effects of O2 and H2O2 on TiO2 Photocatalytic Efficiency Quantified by Formaldehyde Formation from Tris(hydroxymethyl)aminomethane
- Non-Thermal Plasma Aided Soil Decontamination
- Ozone Degradation of Alcohols, Ketones, Ethers and Hydroxybenzenes: Determination of Pathways and Kinetic Parameters
- Power Systems of Plasma Reactors for Non-Thermal Plasma Generation
- Nitrate Removal on a Cu/Cu2O Photocathode under UV Irradiation and Bias Potential
- Gas-phase Photocatalytic Partial Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone on Au/TiO2 Photocatalysts
- DegradationMechanism of Acidic Congo Red in Sunlight/Fe2+/S2O82- System
- Oxidative Degradation of Bisphenol A: A Comparison Between Fenton Reagent, UV, UV/H2O2 and Ultrasound
- CuInS2 Superstrate Solar Cells with ZnO Compact Layer Fabricated by Totally Non-vacuum Methods
- Degradation of Ciprofloxacin and Oxytetracycline Antibiotics in Waste Sewage Sludge by Ozonation
- Quantitative Removal of β-Lactam Antibiotic Activity by Hydroxyl Radical Reaction in Water: How Much Oxidation is Enough?
- Photoelectrocatalytic Decomposition of Acid Red 4 in Aqueous Solution Using Prepared TiO2 Nanotube Arrays of Various Lengths
- Nitrogen-doped TiO2 Photocatalysts Synthesized from Titanium Nitride: Characterizations and Photocatalytic Hydrogen Evolution Performance
- Investigation of the use of Chlorine Based Advanced Oxidation in Surface Water: Oxidation of Natural Organic Matter and Formation of Disinfection Byproducts
- Photodegradation of Benzo-[a]-pyrene on the Surface of the Photocatalytic Paints and Analysis of the Degradation Products
- Ozonation of Textile Reactive Red 198 Dye in a CSTR
- Fabrication of Rh-doped Bi2O3 with Enhanced Photocatalytic Performance by Sol-gel Method
- Photocatalytic Degradation of Phenol in Aqueous Solution by Titanium Dioxide Coupled with Magnetic Field
- Comparison of Different UV-activated AOP Methods
- Degradation of Dithizone by Non Thermal Quenched Plasma of Gliding Arc Type
- Calcination Effects on Properties of TiO2/HZSM-5 Photocatalyst Using Pretreated HZSM-5 Support
Articles in the same Issue
- Electrochemical Inactivation of P. Aeruginosa, A. hydrophila, L. pneumophila using Boron Doped Diamond Anodes
- Effects of O2 and H2O2 on TiO2 Photocatalytic Efficiency Quantified by Formaldehyde Formation from Tris(hydroxymethyl)aminomethane
- Non-Thermal Plasma Aided Soil Decontamination
- Ozone Degradation of Alcohols, Ketones, Ethers and Hydroxybenzenes: Determination of Pathways and Kinetic Parameters
- Power Systems of Plasma Reactors for Non-Thermal Plasma Generation
- Nitrate Removal on a Cu/Cu2O Photocathode under UV Irradiation and Bias Potential
- Gas-phase Photocatalytic Partial Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone on Au/TiO2 Photocatalysts
- DegradationMechanism of Acidic Congo Red in Sunlight/Fe2+/S2O82- System
- Oxidative Degradation of Bisphenol A: A Comparison Between Fenton Reagent, UV, UV/H2O2 and Ultrasound
- CuInS2 Superstrate Solar Cells with ZnO Compact Layer Fabricated by Totally Non-vacuum Methods
- Degradation of Ciprofloxacin and Oxytetracycline Antibiotics in Waste Sewage Sludge by Ozonation
- Quantitative Removal of β-Lactam Antibiotic Activity by Hydroxyl Radical Reaction in Water: How Much Oxidation is Enough?
- Photoelectrocatalytic Decomposition of Acid Red 4 in Aqueous Solution Using Prepared TiO2 Nanotube Arrays of Various Lengths
- Nitrogen-doped TiO2 Photocatalysts Synthesized from Titanium Nitride: Characterizations and Photocatalytic Hydrogen Evolution Performance
- Investigation of the use of Chlorine Based Advanced Oxidation in Surface Water: Oxidation of Natural Organic Matter and Formation of Disinfection Byproducts
- Photodegradation of Benzo-[a]-pyrene on the Surface of the Photocatalytic Paints and Analysis of the Degradation Products
- Ozonation of Textile Reactive Red 198 Dye in a CSTR
- Fabrication of Rh-doped Bi2O3 with Enhanced Photocatalytic Performance by Sol-gel Method
- Photocatalytic Degradation of Phenol in Aqueous Solution by Titanium Dioxide Coupled with Magnetic Field
- Comparison of Different UV-activated AOP Methods
- Degradation of Dithizone by Non Thermal Quenched Plasma of Gliding Arc Type
- Calcination Effects on Properties of TiO2/HZSM-5 Photocatalyst Using Pretreated HZSM-5 Support
