Přihlášení pro studenty

Přihlášení pro zaměstnance

Publikace detail

Interaction of CO probe molecules with Cu(+) in MCM-22 zeolite
Autoři: Frolich Karel | Bulánek Roman | Frýdová Eva
Rok: 2014
Druh publikace: článek v odborném periodiku
Název zdroje: Microporous and Mesoporous Materials
Název nakladatele: Elsevier Science BV
Místo vydání: Amsterdam
Strana od-do: 37-45
Tituly:
Jazyk Název Abstrakt Klíčová slova
cze interakce CO molekuly s Cu(+) v MCM-22 zeolitu Byla studována interakce CO molekuly s mědí iontově vyměněnou v MCM-22 zeolitu. Heterogenita Cu(+) iontů byla testována. Měření byla provedena kombinovanou adsorpční mikrokalorimetrií s FTIR. MCM-22; měď; CO; FTIR; kalorimetrie
eng Interaction of CO probe molecules with Cu(+) in MCM-22 zeolite The interaction of CO probe with copper exchanged MCM-22 zeolite is studied. Particularly, the heterogeneity of Cu(+) ions is examined. For this purpose, combined CO adsorption microcalorimetry with FTIR of CO adsorption/desorption at RT and elevated temperature is originally exploited. Contribution brings the first experimental evidence for three families of Cu(+) ions differing in the interaction energy with CO and exhibiting Q(diff) around 107, 100 - 97 and <= 92 kJ mol(-1), respectively. The energy distribution determined from calorimetry and desorption curves is due to copper coordination differences. Despite wide energetic distribution of carbonyls, only two bands in IR spectra at 2159 and 2150 cm(-1) are observed. Similarly to other zeolites, Cu(+) loses its original coordination to framework during the CO adsorption. The preferred trigonal planar geometry with CO and two zeolite oxygen gives rise to the band at 2159 cm(-1). Peculiarly for MCM-22, significant amount of Cu(+) ions stay three-coordinated to the zeolite after CO adsorption, relate to mediate interaction energies and correspond to the band at 2150 cm(-1). Characteristic changes on the IR spectrum revealed that the enhanced movement of ions after CO exposure occurs at higher temperature. The influence of zeolite composition, namely Cu loading and Si/Al ratio, on the character of IR spectrum and population of energetic components is discussed. MCM-22; Copper; CO probe; FTIR; Calorimetry

Katedry

Ústavy a pracoviště

Jak nás najdete?

zobrazit na mapy.cz

Služby

Často hledáte

© 2023 Univerzita Pardubice, Studentská 95, 532 10 Pardubice 2
Telefon: 466 036 111, 466 036 112, 466 036 113
Správce webu, RSS
ID datové schránky: f5vj9hu
Prohlášení o přístupnosti
CC BY-NC-ND 4.0 CZ