Hydrogen photocatalytic

SrTiOa for hydrogen photocatalytic production from ethanol. Appl. 

Molecular photocatalytic systems for solar energy conversion catalysts for the evolution of hydrogen and oxygen from water. K. I. Zamaraev and V. N. Parman, Russ. Chem. Rev. (Engl. Transl.), 1983,52,817-836(114). 

Production of hydrogen and its derivatives from bio-based raw materials has also been a subject of much research. Several reports can be found on the photocatalytic reforming of biomass to hydrogen [14]. 

Getoff N (1990) Photoelectrochemical and photocatalytic methods of hydrogen production A short review. Int J Hydrogen Energy 15 407 17... 

Navarro RM, Valle F, Fierro JLG (2008) Photocatalytic hydrogen evolution from CdS-ZnO-CdO systems under visible light irradiation Effect of thermal treatment and presence of Pt and Ru cocatalysts. Int J Hydrogen Energy 33 4265-4273... 

The photocatalytic decomposition of water was carried out in a closed gas circulation system connected to a high-vacuum line. About 200 mg of a powdered catalyst was dispersed in pure distilled water and irradiated through a water filter with an Xe lamp operated at 400 W. Hydrogen and oxygen evolved in the gas phase were analyzed by a gas chromatograph which was directly connected to the reaction system. 

Photocatalytic Production of Methanol and Hydrogen from Methane and Water... 

Previous research by our groiqD [6] has confirmed literature reports [1,2] that it is possible to photolyze methane, saturated with water vapcff, to produce methanol and hydrogen. In a modification of the above ejq)eriment, we were also able to photolyze methane sparged throu a photochemical reactor filled with water. Recently, we began investigating the photocatalytic conversion of methane in water. 

Figure 5 shows the results of a typical photocatalytic methane conversion experiment. Methane conversions are -4% with hydrogen and metlmol as the main products of reaction. Note that after the UV lamp is turned off, the detected flow of methanol... 

FIGURE 7. Results of addition of 200 iL of 30% hydrogen peroxide solution to a steady-state photocatalytic reaction. Observed flow of products in mLymin of CH3OH (-----—-), O2... 

Use of combination of cavitation and advanced oxidation processes such as ozonation, chemical oxidation using hydrogen peroxide and photocatalytic oxidation and use of combination of ultrasound and microwave irradiations. 

Intensification can be achieved using this approach of combination of cavitation and advanced oxidation process such as use of hydrogen peroxide, ozone and photocatalytic oxidation, only for chemical synthesis applications where free radical attack is the governing mechanism. For reactions governed by pyrolysis type mechanism, use of process intensifying parameters which result in overall increase in the cavitational intensity such as solid particles, sparging of gases etc. is recommended. 

Mizukozhi Y, Makise Y, Shuto T, Hu J, Tominaga A, Shrionita S, Tanabe S (2007) Immobilization of noble metal nanoparticles on the surface of Ti02 by the sonochemical method photocatalytic production of hydrogen from an aqueous solution of ethanol. Ultrason Sonochem 14 387-392... 

Zhou et al. obtained nitrogen-doped titanium dioxide replicas via a two-step infiltration process with natural leaves as templates [220]. The replicas inherited the hierarchical structures of the natural leaf at the macro-, micro-, and nanoscales. These materials showed enhanced light-harvesting and photocatalytic hydrogen evolution activities. The photocatalytic water splitting activity of the artificial leaf structures was eight times higher than that of titanium dioxide synthesized without templates. 

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