MODELLING OF THE INTERACTION OF NITROGEN DIOXIDE WITH ACTIVATED CARBON I. ADSORPTION DYNAMICS AT THE SINGLE PARTICLE SCALE
Titel:
MODELLING OF THE INTERACTION OF NITROGEN DIOXIDE WITH ACTIVATED CARBON I. ADSORPTION DYNAMICS AT THE SINGLE PARTICLE SCALE
Auteur:
Gray, P. G. Do, D. D.
Verschenen in:
Chemical engineering communications
Paginering:
Jaargang 117 (1992) nr. 1 pagina's 219-240
Jaar:
1992-09-01
Inhoud:
The adsorption dynamics of nitrogen dioxide on activated carbon are measured using a microbalance technique. A theoretical model, incorporating the mechanisms of micropore, macropore and concentration dependent sorbed phase (surface) diffusion, with nonlinear equilibrium (dual Langmuir isotherm), is fitted to the experimental NO2 adsorption dynamics over a range of temperatures, concentrations and particles sizes. The data are well fitted by the model over the temperature range 298-373 K, with typical extracted values of the diffusivities at 298 K being: D/R2μ=0.003 s-11 (micropore), Dp = 0.038 cm2/s (macropore) and Dso=1.0 × 10-6cm2/s (surface) with micropore and surface diffusion activation energies of 14.8 and 11.0 kJ/mole, respectively. The influence of the NO2/N2O4 ratio on the adsorption dynamics is also discussed. At temperature higher than 373 K, significant reaction of NO2 with activated carbon results in consumption of the carbon.
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