The HFC-134/NaY binding has been monitored by temperature dependent X-ray powder diffraction. Diffraction patterns were obtained as a function of different loading levels to investigate the rearrangement of the cations and of the HFC-134 molecules, in the temperature range 100-230 K. In situ real-time data were collected using a Translating Imaging Plate System (TIPS) at the NSLS (USA). Rietveld structure refinements were performed for the HFC-134 (32 molecules per unit cell [m/uc = molecules per unit cell] or 4 molecules per supercage [m/sc = molecules per supercage]) using data collected from 100 to 230 K. A phase transition is observed at about 180 K (A to B phase transition) where a disordering of the HFC-134 molecule takes place and modification of its surrounding due to Na+ migrations is observed. These results are preliminary and the experiment with the 32 m/ue should be repeated in order to assess whether the observed effect is reproducible.

Sorbate rearrangement and cation migration in HFC-134 loaded NaY zeolite: A temperature dependent synchrotron powder diffraction study / Gualtieri, Alessandro; Norby, P; Grey, Cp; Hanson, Jc. - STAMPA. - 443-444:(2004), pp. 295-298. (Intervento presentato al convegno EPDIC 8 Proceedings of the Eighth European Powder Diffraction Conference tenutosi a Uppsala, swe nel 2002) [10.4028/www.scientific.net/msf.443-444.295].

Sorbate rearrangement and cation migration in HFC-134 loaded NaY zeolite: A temperature dependent synchrotron powder diffraction study

GUALTIERI, Alessandro;
2004

Abstract

The HFC-134/NaY binding has been monitored by temperature dependent X-ray powder diffraction. Diffraction patterns were obtained as a function of different loading levels to investigate the rearrangement of the cations and of the HFC-134 molecules, in the temperature range 100-230 K. In situ real-time data were collected using a Translating Imaging Plate System (TIPS) at the NSLS (USA). Rietveld structure refinements were performed for the HFC-134 (32 molecules per unit cell [m/uc = molecules per unit cell] or 4 molecules per supercage [m/sc = molecules per supercage]) using data collected from 100 to 230 K. A phase transition is observed at about 180 K (A to B phase transition) where a disordering of the HFC-134 molecule takes place and modification of its surrounding due to Na+ migrations is observed. These results are preliminary and the experiment with the 32 m/ue should be repeated in order to assess whether the observed effect is reproducible.
2004
EPDIC 8 Proceedings of the Eighth European Powder Diffraction Conference
Uppsala, swe
2002
443-444
295
298
Gualtieri, Alessandro; Norby, P; Grey, Cp; Hanson, Jc
Sorbate rearrangement and cation migration in HFC-134 loaded NaY zeolite: A temperature dependent synchrotron powder diffraction study / Gualtieri, Alessandro; Norby, P; Grey, Cp; Hanson, Jc. - STAMPA. - 443-444:(2004), pp. 295-298. (Intervento presentato al convegno EPDIC 8 Proceedings of the Eighth European Powder Diffraction Conference tenutosi a Uppsala, swe nel 2002) [10.4028/www.scientific.net/msf.443-444.295].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/4602
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