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expected inverse trend of productivity and cycle time more closely that the packed bed, also at very short cycle times. It is clear that dispersive effects of pressure drop and mass transfer are becoming more important at shorter cycle times for the packed bed. Cycle times below 15 s eventually leads to a drop in throughput for the packed bed as observed in Figure 13 and also observed in our earlier studies31. Thus the structured adsorbents show promising performance at short cycle times provided higher zeolite loadings can be obtained. Figure 14 (a-c) illustrates simulated pressure profiles of three adsorbents for 25 s cycle time at z = 0 (inlet) and z = 1(outlet). As clearly shown, both types of monoliths showed identical profiles at inlet (z = 0) and outlet (z = 1) of the adsorption column indicating negligible pressure drop along the bed, however, running a PSA cycle with a bed of granules gives rise to considerable pressure drop characterizing by different curves at inlet and outlet of the bed (Fig 14 (a)). 5. Conclusion Structured adsorbents were prepared by growing uniform NaX films on ceramic cordierite monoliths with the two different cell densities. The performance of the structured adsorbents in a VSA process for CO2 capture was evaluated and compared with conventional adsorbent beads by mathematical modelling. We found that a CO2 product purity of greater than 30 % and a recovery of 90 % is achievable with an ideal 900 cpsi monolith adsorbent in a 3 step VSA cycle. Although beads showed a better performance in terms of purity and throughput at longer cycle times, at shorter cycle times structured adsorbents may show less effect of pressure drop and hence lead to improve product recovery, purity and throughput. In summary, our results indicate that structured adsorbents are good candidates for use in rapid cycles when the system performance is compromised by using conventional beads. It is clear however that every effort must be made to increase the zeolite loading without compromising effective mass transfer. Our future work will examine the performance of adsorbent 127PDF Image | Structured Zeolite Adsorbents for PSA Applications
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