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TPR/TPO characterization of cobalt–silicon mixed oxide nanocomposites prepared by sol–gel |
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| Authors: | Giovanni Bagnasco Claudia Cammarano Maria Turco Serena Esposito Antonio Aronne Pasquale Pernice |
| Institution: | aUniversità di Napoli Federico II, Dipartimento di Ingegneria Chimica, Piazzale Tecchio, 80125 Napoli, Italy bUniversità di Cassino, Dipartimento di Meccanica, Strutture, Ambiente e Territorio, Via G. di Biasio 43, 03043 Cassino, Italy cUniversità di Napoli Federico II, Dipartimento di Ingegneria dei Materiali e Produzione, Piazzale Tecchio, 80125 Napoli, Italy |
| Abstract: | Cobalt–silicon mixed oxides with Co/Si ratio of 10/90 (10Co), 20/80 (20Co) and 30/70 (30Co) were prepared by a modified sol–gel method. The materials treated in air at 400 and 600 °C were characterized by SEM and TPR/TPO techniques. TPR measurements showed that in all samples only a fraction of Co was present as Co3O4 and as amorphous silicate and was reducible by H2 within 800 °C, while a part was not reducible under TPR conditions. The fraction of Co not reducible decreased with increasing Co content. A TPO/TPR cycle gave rise to an increase of the fraction of not reducible Co. |
| Keywords: | TPR/TPO Cobalt–silicon mixed oxides Sol–gel method |
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