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Results reveal that zeolite 13X become useless with less than 0.1% of water content in the mixture, and just a 0.01% of moisture in the adsorbent is able to significantly reduce the CO2 adsorption capacity. Conversely, it was found that even with a concentration of SO2 and NO2 in the flue gas as high as 1,000ppm (i.e., 0.1%), the energy performance (GJ/tonne-CO2) in the flue gas mixtures remains essentially unaffected. In addition, purity and recovery can be highly increased with slightly lower working capacities, attributed to the introduction of a certain amount of competitive molecules in the flue gas. Moreover, these impurities traces can be beneficial and reduce the exergetic requirements per tonne of CO2 captured up to a certain inflection value where the increase in energy cost becomes exponential. The minimum energy requirement inflection points were obtained for TSA at a desorbing temperature of 443K in all three materials, and with impurities compositions in the mixture of 1% H2O for CuBTC, 0.5% H2O for Mg-MOF-74 and 0.02% H2O for zeolite 13X (with values of 1.13, 0.55 and 0.58 GJ/tCO2, respectively). After considering operating conditions and with respect to the results presented here, Mg-MOF-74 stands up as one of the most promising materials to be used in TSA/VTSA processes for its great performance and “buffer” behavior with the inclusion of lower amounts of impurities. Moreover, CuBTC emerges as a good candidate for separation when higher moisture or impurity content above 1% is present in the mixture, and purity is not a determinant factor. This study represents a first quantitative assessment of the process performance that can be achieved including impurities effects onto novel adsorbent materials in VSA/PSA/TSA process for CO2 capture. Further studies will include detailed modeling 52PDF Image | swing adsorption processes for CO2 capture in selected MOFs and zeolites
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