Photocatalytic Oxidation of Benzene in Air

Einaga, Hisahiro; Ibusuki, Takashi; Futamura, Shigeru

doi:10.1115/isec2003-44205

Cited by 61 publications

(92 citation statements)

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“…Anatase structure is kept in both TiO 2 photocatalysts and rutile phase is observed in P25 structure. In case of P25 the content of rutile is sufficiently large to build-up the carbon deposits on the photocatalyst surface [13,19,20].…”

Section: Resultsmentioning

confidence: 99%

Lifetime of Carbon-Modified TiO2 Photocatalysts Under UV Light Irradiation

et al. 2009

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Carbon-modified photocatalyst was obtained by modification of the commercial anatase TiO 2 (Police, Poland) in a pressure reactor in an ethanol atmosphere at 120°C for 4 h. The activity was tested during monoazo dye decomposition under UV light irradiation (Reactive Red 198 with k max = 516 nm). The reusability aspect of carbon-modified TiO 2 photocatalysts was predominantly studied. Using the additional aeration process caused to stabilization the ''decolourisation time'' of aqueous solution of Reactive Red 198. To compare the activity of obtained material the commercial TiO 2 P25 was used and only on its surface the presence of carbon deposits were observed.

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Section: Resultsmentioning

confidence: 99%

Lifetime of Carbon-Modified TiO2 Photocatalysts Under UV Light Irradiation

et al. 2009

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“…However, the undesirable intermediate products of photocatalytic oxidation tend to poison the active sites on the catalyst surface thereby deactivating the catalyst [77]. Einaga et al [78] have efficiencies. An increase in the relative humidity would significantly reduce the adsorption of intermediates thus enhancing toluene removal efficiencies.…”

Section: Comparison Of the Catalyst Performance With Other Reported Cmentioning

confidence: 98%

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

et al. 2014

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Dispersed copper oxide nano-catalysts supported on almond shell-based activated carbon were prepared for catalytic oxidation of toluene in air. The response surface methodology was used to express the catalyst removal efficiency in terms of catalyst metal loading and calcination temperature. Catalyst activity increased with both increasing calcination temperature and metal loading. Calcination temperature had a significant effect on the catalyst activity only at high metal loadings. Two different catalyst preparation methods were employed to investigate the effect of impregnation technique on the deposition-precipitation method. Well-dispersed nano catalysts with higher efficiency towards oxidation of toluene were prepared by the heterogeneous depositionprecipitation (HDP) as compared with the combined impregnation and deposition-precipitation method. The support and catalyst properties were determined by X-ray diffraction, Transmission electron microscopy, fieldemission scanning electron microscope, Boehm test, Brunauer-Emmett-Teller surface area measurements, and energy-dispersive X-ray spectroscopy. Characterization analyses and reaction experiments indicated the antonym effect of impregnation method on the deposition-precipitation method for catalyst preparation. Two types of crystallite (large and small) were formed on the support as a consequence of using the combined catalyst preparation method. Kinetic models were proposed for oxidation of toluene using copper oxide catalysts prepared by the HDP method. The kinetic study indicated that an Eley-Rideal mechanism could adequately describe the kinetic behavior of toluene oxidation.List of symbols C 0 Inlet feed concentration (ppm) C e Exit gas concentration (ppm) D Mean crystallite diameter (nm) K Dimensionless shape factor = 0.9 k X-ray wavelength BLine broadening at half maximum intensity H Bragg angle X T Steady state conversion of the toluene W Weight of catalyst loaded in reactor (g) M Inlet molar flow rate of toluene (mol/s) r Rate of toluene oxidation (mol/g s) Error Objective function of GA methodology for estimating kinetic constants was the absolute error E Activation energy (kJ/mol) DH Adsorption enthalpy (kJ/mol) R Gas constant (J/mol K) R 2

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“…This assumption is reasonable considering the short duration of the irradiation (30-45 min) and the low toluene concentrations (in the ppb range). For much higher concentrations (in the hundreds of ppm), rapid inactivation of the photocatalyst has been reported [38]. Figure 4 shows the average reaction rates T r determined as a function of RH for both series of experiments.…”

Section: Effect Of the Relative Humidity On Toluene Removalmentioning

confidence: 99%