http://www.cnr.it/ontology/cnr/individuo/prodotto/ID193925
UNUSUAL COMPLETE REDUCTION OF Cu2+ SPECIES IN Cu-ZSM- 5 ZEOLITES UNDER VACUUM TREATMENT AT HIGH TEMPERATURE (Articolo in rivista)
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- UNUSUAL COMPLETE REDUCTION OF Cu2+ SPECIES IN Cu-ZSM- 5 ZEOLITES UNDER VACUUM TREATMENT AT HIGH TEMPERATURE (Articolo in rivista) (literal)
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- 2012-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1021/cm203796u (literal)
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OCCHIUZZI M.; FIERRO G.; FERRARIS G.; MORETTI G. (2012)
UNUSUAL COMPLETE REDUCTION OF Cu2+ SPECIES IN Cu-ZSM- 5 ZEOLITES UNDER VACUUM TREATMENT AT HIGH TEMPERATURE
in Chemistry of materials; ACS, American chemical society, Washington, DC (Stati Uniti d'America)
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- OCCHIUZZI M.; FIERRO G.; FERRARIS G.; MORETTI G. (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- OCCHIUZZI M. [1]; FIERRO G. [2]; FERRARIS G. [2]; MORETTI G. [1];
[1] Dipartimento di Chimica - Università di Roma 'SAPIENZA';
[2] Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), Sezione di Roma 'Materiali Inorganici e Catalisi Eterogenea' (MICE, ex Centro di Studio CNR 'SACSO'), c/o Dipartimento di Chimica, Università di Roma 'SAPIENZA' (literal)
- Titolo
- UNUSUAL COMPLETE REDUCTION OF Cu2+ SPECIES IN Cu-ZSM- 5 ZEOLITES UNDER VACUUM TREATMENT AT HIGH TEMPERATURE (literal)
- Abstract
- By electron paramagnetic resonance (EPR),
coupled to elemental and thermogravimetric analysis and
diffuse reflectance spectroscopy (DRS), we investigated the
unusual quasi-complete reduction of Cu2+ species in Cu-ZSM-
5 zeolites (Si/Al = 80 and 25) at different copper loadings
induced by high-temperature vacuum treatments. It has been
found that at high temperatures (673-773 K) in vacuum a
quasi-complete reduction of Cu2+ unexpectedly occurred in all
the \"as-prepared Cu-ZSM-5 samples. Evidence is given that
such extensive reduction of Cu2+ species is caused by
carbonaceous deposits. In order to completely remove any
residual carbonaceous species, the \"as-prepared\" Cu-ZSM-5
materials must be heated in air (or O2) at high temperature
(673-773 K) for prolonged time. Differently, some carbon residue, as in particular originated from the organic template used in
the zeolite synthesis, can be left within the channels of the ZSM-5 structure. We show also that such a carbon residue, even when
escapes the detection accuracy of elemental analysis, can be checked by a careful EPR characterization.
KEYWORDS: Cu-ZSM-5 zeolites, reduction of Cu2+ species by carbonaceous deposits, EPR evidence of organic template residue,
DRS characterization, EPR characterization (literal)
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