Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 228, Issue -, Pages 248-255Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2016.03.046
Keywords
Na-faujasite; CO2 adsorption; CO2 desorption; Synchrotron X-ray powder diffraction; High temperature structural studies
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Funding
- Italian MIUR [2010EARRRZ 008]
- FIRB
- Futuro in Ricerca 'Impose Pressure and Change Technology' (RBFR12CLQD)
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Preferential adsorption of water is a major problem in the processes of CO2 adsorption on molecular sieves. Adsorption and desorption of CO2 on partially hydrated zeolite Na-Y have been monitored by in situ synchrotron X-ray powder diffraction. The structural refinement of the CO2-saturated diffraction pattern highlighted the formation of tetrameric CO2 clusters connected by water bridges to the sodium cations of two adjacent faujasite supercages. The CO2 desorption was followed by collecting a series of diffraction patterns upon heating from room temperature up to 350 degrees C. The hydrated CO2 clusters are completely desorbed between 250 degrees C and 350 degrees C. This high thermal stability suggests that the formation of hydrated complexes could represent a potentially important mechanism of retention of CO2 during the regeneration of CO2 adsorbents. (C) 2016 Elsevier Inc. All rights reserved.
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