Search results for "Adsorption selectivity"

showing 2 items of 2 documents

Selective adsorption of formaldehyde and water vapors in NaY and NaX zeolites

2019

International audience; Coadsorption of formaldehyde and water vapors on NaX and NaY zeolites is studied at 298 K in the pressure range 0-2 hPa by manometry coupled with gas phase chromatography and calorimetry. Coadsorption isotherms, adsorption selectivities and coadsorption heats are measured. Results show that the coadsorption process is selective for water at low filling and for formaldehyde at high filling. The adsorption selectivity for formaldehyde over water is however too low to consider the possibility of using such adsorbents for the development of air handling units. On the other hand, a preliminary study carried out on the adsorption of formaldehyde and water in pure gas phase…

Inorganic chemistrywaterFormaldehyde02 engineering and technologyCalorimetry010402 general chemistry01 natural sciencesHigh silicaAdsorption selectivityPressure rangechemistry.chemical_compoundAdsorptionCoadsorption;Formaldehyde;Water;Zeolite;Selectivity[CHIM]Chemical SciencesGeneral Materials SciencezeoliteZeoliteComputingMilieux_MISCELLANEOUSChemistrycoadsorptionselectivityGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciences[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistryMechanics of MaterialsSelective adsorptionformaldehyde0210 nano-technology
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D2/H2 adsorption selectivity on FAU zeolites at 77.4 K: Influence of Si/Al ratio and cationic composition

2018

Abstract Equilibrium D2/H2 adsorption selectivity was determined at 77.4 K below 1000 hPa for a series of FAU type zeolites X exchanged with different cations (Li+, Na+, K+, Mg2+, Ca2+, Ba2+ and Mn2+). In addition NaY, DAY (dealuminated Y) and pure silica CHA and MFI zeolites were studied. Two experimental approaches were used to determine the D2/H2 adsorption selectivity: direct determination at the thermodynamic equilibrium from manometric coadsorption experiments and calculations by Ideal Adsorbed Solution Theory (IAST) from single gas adsorption isotherms. While these two approaches are not in quantitative agreement, they reveal similar trends. At low loading (  MnX > LiX > CaX ≈ NaX > …

LangmuirThermodynamic equilibriumChemistryCationic polymerizationHigh loading02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics01 natural sciences7. Clean energy0104 chemical sciencesAdsorption selectivity[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistryAdsorption13. Climate actionMechanics of MaterialsPhysical chemistry[CHIM]Chemical SciencesGeneral Materials ScienceComposition (visual arts)0210 nano-technologySelectivityComputingMilieux_MISCELLANEOUS
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