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maximum observed by SEM), the estimated diffusivity is about 5 ยท 10-13 m2/s, which is still about one order of magnitude lower than for the film. Conclusions Well intergrown zeolite films with a limited amount of sediments and HS crystals were grown on 400 cpsi cordierite monoliths by using a clear solution and a multiple step synthesis. Films grown in the clear solution in one longer hydrothermal treatment were less intergrown and sediments and large HS crystals were observed. Films grown in the gel were well intergrown but a large amount of sediments on top of the film was observed. The different morphologies of the zeolite films resulted in different adsorption performances as revealed from breakthrough experiments. The CO2 breakthrough front for the film grown by a multiple step procedure was very sharp and the adsorption capacity was significant, which is ideal for PSA applications. The experimental evidence in the present work will be important for the development of novel CO2 adsorbents to use as a competitive alternative to traditionally used zeolite beads or extrudates. Nomenclature t time, s c concentration at time t, vol% c0 concentration at time 0, vol % K dimensionless Henry constant k coefficient of mass transfer, s-1 k* geometric factor, m-2 [12] z column length, m v superficial velocity, m s-1 dq dt uptake rate q* equilibrium adsorbate loading, kg/kg 81PDF Image | Structured Zeolite Adsorbents for PSA Applications
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