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EnglishThe autoreduction process of Cu2+ species in Cu-ZSM-5 catalysts, with Si/Al=80 and copper exchange levels of 81 and 536% was studied by means of spectroscopic (in situ diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy) and chemical methods (thermogravimetry in N2, elemental analysis, adsorption-desorption of N2 at 77 K and adsorption of N2 at 77K). It appears that on the fresh catalysts (treated in air at 383 K) the majority of Cu2+ species may be reduced to Cu+, under vacuum or in a flow of inert gas at high temperature, by means of the carbonaceous deposits left in the zeolite synthesis. In the absence of the carbonaceous deposits (Cu-ZSM-5 treated in air at 823K) the autoreduction of Cu2+ speciesto Cu+ may occur only to a small extent in overexchanged Cu-ZSM-5 catalysts. The Cu+ ions so produced are peculiar in their ability to held N2 at 273 K. the amount of adsorbed N2, which resists evacuation at 273 K, indicates that about 2% of the Cu2+ ions may be reduced to Cu+ in overexchanged Cu-ZSM-5 (Sio/Al=80) catalysts pretreated in vacuum at 723 K.
Autoreduction of Cu2+ species in Cu-ZSM-5 catalysts studied by diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, thermogravimetry and elemental analysis / Moretti, Giuliano; Ferraris, G.; Galli, P.. - ELETTRONICO. - 135(2001), pp. 5020-5028.
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| Titolo: | Autoreduction of Cu2+ species in Cu-ZSM-5 catalysts studied by diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, thermogravimetry and elemental analysis | |
| Autori: | ||
| Data di pubblicazione: | 2001 | |
| Serie: | ||
| Citazione: | Autoreduction of Cu2+ species in Cu-ZSM-5 catalysts studied by diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, thermogravimetry and elemental analysis / Moretti, Giuliano; Ferraris, G.; Galli, P.. - ELETTRONICO. - 135(2001), pp. 5020-5028. | |
| Handle: | http://hdl.handle.net/11573/148358 | |
| Appartiene alla tipologia: | 04b Atto di convegno in volume |
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