INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
artículos
Título:
Adsorption and diffusion of toluene on Na and Cs mordenites for hydrocarbon traps
Autor/es:
RAMIRO M. SERRA; EDUARDO E. MIRO; MANUEL K. SAPAG; ALICIA V. BOIX
Revista:
MICROPOROUS AND MESOPOROUS MATERIALS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Atlanta; Año: 2010 vol. 138 p. 102 - 109
ISSN:
1387-1811
Resumen:
In this work, we report results of toluene adsorption on Cs-exchanged Na mordenite with different Cs
loadings. Breakthrough curves were obtained, from which adsorption capacities at different gas phase
concentration and temperatures could be calculated. Temperature-programmed desorption experiments
were used in order to assess the strength of toluenezeolite interactions. Pulse chromatographic experiments
combined with moment analysis allowed us to obtain adsorption and diffusion constants.
The results show that the addition of a small amount of Cs (2 wt%) produces an increase in both the
toluene adsorption capacity and the interaction strength. A higher amount of Cs (up to 19 wt%) also
results in an increase of the toluenezeolite interaction strength, but the adsorption capacity decreases
due to steric effects. Pulse chromatographic experiments show that the diffusion coefficient of toluene
increases with the increase of the Cs loading, which is probably a consequence of the increase of the
external surface of the mordenite crystals. For the different samples, diffusion coefficients vary in the
10141017 cm2 s1 range with activation energies between 55 and 65 kJ mol1.141017 cm2 s1 range with activation energies between 55 and 65 kJ mol1.