Journal of the Chemical Society - Faraday Transactions p. 1867 - 1870 (1993)
Update date:2022-08-10
Topics:
Green, Kevin J.
Rudham, Robert
The photocatalytic oxidation of liquid propan-2-ol to propanone has been investigated using semiconductor-zeolite composites consisting of either CdS or TiO2 in Y zeolite.CdS-based composites were prepared by cation exchange with Cd2+ followed by sulfidation with either Na2S or H2S, whereas TiO2-based composite was prepared by Ti(OEt)4 impregnation followed by hydrolysis and calcination.Rate measurements at 303 K were made to assess how the activity of CdS-based material depended on reaction conditions; differences from CdS supported on γ-Al2O3 are ascribed to smaller CdS particles and the higher adsorption potential of the zeolite matrix for O2 and H2O.However, rate measurements under standard conditions over the temperature range 283-308 K yielded the same activation energies as for CdS and TiO2 supported on γ-Al2O3, 53 +/- 2 kJ mol-1 for CdS-based catalysts and 21 +/- 1 kJ mol-1 for TiO2-based catalysts.It follows that the physico-chemical properties of the semiconductor control the activation energy, whereas the zeolite matrix is responsible for controlling semiconductor particle size during preparation and modifying the effective reaction conditions through adsorption.
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