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Articles by Deniz UNER
Total Records ( 2 ) for Deniz UNER
  Sarp KAYA and Deniz UNER
  The CO oxidation capability of sequentially impregnated Pd-Pt/γ -Al2O3 bimetallic catalysts was tested. The CO oxidation light-off curves were hierarchically spaced between monometallic Pd and monometallic Pt, which showed the highest and lowest activity, respectively, indicating that sequential impregnation did not result in the formation of bimetallic particles, but that the catalysts remained as monometallic entities over the support surface. An investigation of the effect of CO partial pressure on the reaction rates over monometallic catalysts indicated that in the presence of excess CO the surface of Pt was poisoned. On the other hand, in the presence of excess CO the reaction rates over Pd catalysts remained constant due to the availability of the subsurface oxygen pools in PdO layers.
  Shahab Khameneh ASL , Sayad Khatib SADRNEZHAAD , Mansour Keyanpour RAD and Deniz UNER
  Treatment of dye pollution containing C.I. Acid Red 14 (AR14) by a coupled photocatalytic process was studied. Titanium dioxide, in the form of anatase and rutile, and zinc oxide, were used as photocatalysts. The investigated photocatalysts were Aldrich-produced nanopowders with crystallites of a mean size of 20−30 nm and a specific surface area of about 50 m2/g. A comparison of TiO2(anatase), TiO2(rutile), TiO2(a,r), and ZnO for the decolorization of the AR14 solution was performed. Results showed that color removal followed the decreasing order of TiO2(a,r), ZnO > TiO2(a,r) > TiO2(a), ZnO > TiO2(r), ZnO >TiO2(a,r) > TiO2(a) > ZnO > TiO2(r). Response surface methodology (RSM) was employed to assess the individual and interactive effects of the 4 main independent parameters in the photocatalytic process. Analysis of variance showed a high coefficient of determination (R2 = 0.9396) and satisfactory prediction second-order regression. The optimum initial amounts of TiO2(a), TiO2(r), ZnO, and dye and the reaction time were found to be 84 ppm, 23 ppm, 86 ppm, 20 ppm, and 48 min, respectively. It was demonstrated that RSM with suitable 2D and 3D graphs was a suitable method for finding the interactions between parameters, identifying the main parameters, and optimizing the operating conditions.
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