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 °C. The hydrated CO2 clusters are completely desorbed between 250 °C and 350 °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.

Evidence for the formation of stable CO2 hydrates in zeolite Na-Y: Structural characterization by synchrotron X-ray powder diffraction

ARLETTI, Rossella;GIGLI, LARA;
2016-01-01

Abstract

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 °C. The hydrated CO2 clusters are completely desorbed between 250 °C and 350 °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.
2016
Inglese
Esperti anonimi
228
248
255
8
www.elsevier.com/inca/publications/store/6/0/0/7/6/0
CO2 adsorption; CO2 desorption; High temperature structural studies; Na-faujasite; Synchrotron X-ray powder diffraction; Materials Science (all); Mechanics of Materials; Chemistry (all); Condensed Matter Physics
FRANCIA
1 – prodotto con file in versione Open Access (allegherò il file al passo 6 - Carica)
262
4
Arletti, Rossella; Gigli, Lara; Di Renzo, Francesco; Quartieri, Simona
info:eu-repo/semantics/article
partially_open
03-CONTRIBUTO IN RIVISTA::03A-Articolo su Rivista
File in questo prodotto:
File Dimensione Formato  
CO2 preprint.pdf

Open Access dal 02/05/2018

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 1.84 MB
Formato Adobe PDF
1.84 MB Adobe PDF Visualizza/Apri
Arletti_Microporous Mesoporous Mater_2016.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 884.03 kB
Formato Adobe PDF
884.03 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1564645
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 17
  • ???jsp.display-item.citation.isi??? 15
social impact