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Temperature Dependence of Carbon Monoxide Adsorption on a High-Silica H-FER Zeolite
Authors: Rubes Miroslav | Trachta Michal | Koudelková Eva | Bulánek Roman | Klimes Jiri | Nachtigall Petr | Bludsky Ota
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Journal of Physical Chemistry C
Publisher name: American Chemical Society
Place: Washington
Page from-to: 26088-26095
Titles:
Language Name Abstract Keywords
cze Teplotní závislost CO adsorpce na H-FER zeolity s vysokým obsahem siliky teplotní závislost tepla adsorpce CO na vysoce silikátové H-FER zeolity byla zkoumína použitím mikrokalorimetrie a DFT/CC simulace. Výrazná změna byla nalezna v rozmezí teplot 200-300 K a byla přisouzena dramatické změně dynamiky CO. Tato skutečnost byla potvrzena DFT/CC simulací. kyselost; CO; N2;FTIR; simulace; povrch; polohy
eng Temperature Dependence of Carbon Monoxide Adsorption on a High-Silica H-FER Zeolite The temperature dependence of the isosteric heat of the CO adsorption on a high-silica protonic ferrierite (H-FER) zeolite was investigated using microcalorimetry and density functional theory/coupled-cluster (DFT/CC) atomistic simulations. A large change in the experimental heat of adsorption was observed at the zero-coverage limit for the CO/H-FER system (from 32.2 kJ/mol at 200 K to 25.4 kJ/mol at 300 K). This can be explained by a dramatic change in the CO dynamics in the 200-300 K temperature range. During our ab initio molecular dynamics simulation at 200 K, the CO molecule is localized; at 300 K, the molecule jumps between adjacent Bronsted sites. The only exception has been found for the T-4 '' site, where the fast desorption of the CO molecule is prevented by a curved ferrierite wall enclosing this site. The previously reported variable temperature adsorption of the CO/H-FER with Si/A1 27.5 (28.4(+/- 2) kJ/mol) is consistent with the Perdew-Burke-Ernzerhof/CC predictions for individual sites when the statistical distribution of adsorption sites and temperature effects are taken into account. acid strength; co; n-2; ftir; simulation; dinitrogen; surface; sites

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