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minutes each. More details have been reported previously 21. The sample notation used here starts with the letter C for clear solution, followed by a number indicating the number of steps (5), and a number (400 or 900) indicating the cell density of the supports, see Table 1. The weight gain (gzeolite/gsample) was determined by weighing the support before and after hydrothermal treatment. Products were characterized by scanning electron microscopy (SEM), nitrogen adsorption and desorption at 77 K and mercury intrusion porosimetry (MIP). Pure component adsorption data for N2 and CO2 were measured at 0, 20 and 40°C over the pressure range of 0-118 kPa. The films were also characterized by measuring the CO2 breakthrough profile with step change experiments similar to those described in our previous work 22. In these experiments, three coated monolith samples, each 10 cm long and 2 cm in diameter were loaded in the adsorption column (30 cm long and 2 cm diameter). The samples were activated under a nitrogen flow of 0.2 l/min at 300o C for 3 hours with a heating and cooling rate of 2 o C/min. The samples were thereafter cooled to room temperature (26 o C). The breakthrough data were used to estimate the overall mass transfer coefficient, k for subsequent use in process cycle simulation. To determine the overall mass transfer coefficient, a single breakthrough step was simulated using the numerical adsorption simulator (described below) with k as a variable. 3. Process simulation Simulations of a three-step VSA cycle with a packed bed of conventional adsorbents and the structured adsorbents were performed using the adsorption simulator MINSA, (Monash Integrator for Numerical Simulation of Adsorption) which numerically solves the coupled partial differential equations of mass and energy balances using the finite volume method with flux limiters as described previously 28-29. The linear driving force model was employed to model mass transfer. Pressure drop across the adsorbent beds was calculated 117PDF Image | Structured Zeolite Adsorbents for PSA Applications
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