Study of the thermal transformations of Co- and Fe-exchanged zeolites A and X by 'in situ' XRD under reducing atmosphere

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2010.02.006· OSTI ID:22207320

Ronchetti, Silvia ^[1]; Turcato, Elisa Aurelia; Delmastro, Alessandro ^[1]; Esposito, Serena; Ferone, Claudio; Pansini, Michele ^[2]; Onida, Barbara; Mazza, Daniele ^[1]

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1. Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino (Italy)
2. Laboratorio Materiali del Dipartimento di Meccanica, Strutture, Ambiente e Territorio, Facolta di Ingegneria dell'Universita di Cassino, Via G. Di Biasio 43, 03043 Cassino (Italy)

'In situ' high temperature X-ray diffraction under reducing atmosphere is used for the first time to study the thermal stability and transformations of Co- and Fe-exchanged A and X zeolites. TG-DTA and 'ex situ' XRD characterization were also carried out. The temperature of incipient crystallization of metallic phase was found to be 700 {sup o}C in Fe-zeolites and 800 {sup o}C in Co-zeolites. Moreover, ex situ X-ray experiments, after thermal treatment both under inert and reducing atmosphere, revealed the formation of ceramic phases upon the thermal collapse of the zeolitic framework. Metal nanoparticles were obtained by reduction and the size of metal clusters was found to range between 24 and 40 nm.

• OSTI ID: 22207320
• Journal Information: Materials Research Bulletin, Vol. 45, Issue 6; Other Information: Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CRYSTALLIZATION
DIFFERENTIAL THERMAL ANALYSIS
HEAT TREATMENTS
NANOSTRUCTURES
THERMAL GRAVIMETRIC ANALYSIS
X RADIATION
X-RAY DIFFRACTION
ZEOLITES