The kinetics of the glycerol oxidation using a carbon supported gold catalyst was studied experimentally in a batch reactor at oxygen pressures up to 10 bar and at temperatures from 25 to 100°C. The influence of the mass transfer on the reaction was estimated and confirmed with theoretical calculations. A kinetic model has been proposed on the basis of a Langmuir-Hinshelwood mechanism for the experiments carried out in the kinetic regime and the kinetic parameters (reaction rate and adsorption constants as well as activation energies) were calculated. diffusion coefficient [m 2 /s]; D eff : effective diffusion coefficient [m 2 /s]; e: rate of flow energy supply per unit mass of liquid [m 2 /s 3 ]; E A : activation energy [J/mol]; Fr: Froude number [)]; H i : Henry´s coefficient [kPa m 3 /mol]; k 1 ... k 6 : reaction rate constants [L ðn i þn bi À1Þ /(mol n i þn bi À1 min g)]; k 01 ... k 06 : pre-exponential factors [L ðn i þn bi À1Þ /(mol n i þn bi À1 min g)]; K 1 ... K 6 : adsorption equilibrium constants [l/mol]; k l : gas-liquid mass transfer coefficient [cm/s]; k l a: volumetric gas-liquid mass transfer coefficient [s )1 ]; k s : liquid-solid mass transfer coefficient [cm/s]; n 1 ... n 6 : reaction order with respect to the educt of step 1 ... 6 [)]; n b : reaction order with respect to the base concentration [)]; N: speed of agitation [Hz]; N P : power number [)]; P: oxygen pressure [kPa]; r 1 ... r 6 : reaction rates of respective steps in figure 1 [mol/L min]; Re: Reynolds number [)]; Sc: Schmidt number [)]; V: reaction volume [m 3 ]; V s : superficial gas velocity [cm/s]; w: catalyst amount [g]Greek Letters: a l : ratio chemical reaction/gas-liquid mass transfer [)]; a s : ratio chemical reaction/liquid-solid mass transfer [)]; / exp : Thiele modulus [)]; : catalyst porosity [)]; l: viscosity of the liquid [g/cm s]; m: kinematic viscosity [cm 2 /s]; r: surface tension [g/s 2 ]; q: density of the liquid [g/cm 3 ]; w: shape factor [)]; s: catalyst tortuosity [)]; x: ratio catalyst weight to reactor volume [kg/m 3 ]
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