a b s t r a c tRegarding the importance of adsorptive removal of carbon monoxide from hydrogen-rich mixtures for novel applications (e.g. fuel cells), this work provides a series of experimental data on adsorption isotherms and breakthrough curves of carbon monoxide. Three recently developed 5A zeolites and one commercial activated carbon were used as adsorbents. Isotherms were measured gravimetrically at temperatures of 278-313 K and pressures up to 0.85 MPa. Breakthrough curves of CO were obtained from dynamic column measurements at temperatures of 298-301 K, pressures ranging from 0.1 MPa to ca. 6 MPa and concentrations of CO in H 2 /CO mixtures of 5-17.5 mol%. A simple mathematical model was developed to simulate breakthrough curves on adsorbent beds using measured and calculated data as inputs. The number of parameters and the use of correlations to evaluate them were restricted in order to focus the importance of measured values. For the given assumptions and simplifications, the results show that the model predictions agree satisfactorily with the experimental data at the different operating conditions applied.

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The separation of nitrogen and methane from hydrogen-rich mixtures is systematically investigated on a recently developed binder-free zeolite 5A. For this adsorbent, the present work provides a series of experimental data on adsorption isotherms and breakthrough curves of nitrogen and methane, as well as their mixtures in hydrogen. Isotherms were measured at temperatures of 283À313 K and pressures of up to 1.0 MPa. Breakthrough curves of CH 4 , N 2 , and CH 4 /N 2 in H 2 were obtained at temperatures of 300À305 K and pressures ranging from 0.1 to 6.05 MPa with different feed concentrations. An LDF-based model was developed to predict breakthrough curves using measured and calculated data as inputs. The number of parameters and the use of correlations were restricted to focus on the importance of measured values. For the given assumptions, the results show that the model predictions agree satisfactorily with the experiments under the different operating conditions applied.

This work provides a series of methane adsorption isotherms and breakthrough curves on one 5A zeolite and one activated carbon. Breakthrough curves of CH 4 were obtained from dynamic column measurements at different temperature and pressure conditions for concentrations of 4.4 -17.3 mol.-% in H 2 /CH 4 mixtures. A simple model was developed to simulate the curves using measured and calculated data inputs. The results show that the model predictions agree very well with the experiments.

A study was made on the thermodesorption of ethanol from pentasil zeolites with varying silicon-to-aluminium ratio and from different syntheses. The investigations have shown that the two maxima in the DTG curves are connected with the molecules adsorbed by unspecific dispersion-and specific field-dipole interaction. The shapes of the DTG curves differ according to the synthesis procedure.