| Full text | |
| Author(s): |
Passos, Aline R.
[1, 2]
;
Martins, Leandro
[1]
;
Pulcinelli, Sandra H.
[1]
;
Santilli, Celso V.
[1]
;
Briois, Valerie
[2]
Total Authors: 5
|
| Affiliation: | [1] Sao Paulo State Univ UNESP, Inst Chem, Rua Prof Francisco Degni 55, BR-14800900 Araraquara, SP - Brazil
[2] Synchrotron SOLEIL, BP48, F-91192 Gif Sur Yvette - France
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | CHEMCATCHEM; v. 9, n. 20, p. 3918-3929, OCT 23 2017. |
| Web of Science Citations: | 7 |
| Abstract | |
The effect of sol-gel alumina characteristics on the supported Co catalyst properties was investigated at the different steps of catalyst preparation. Porous alumina with variable surface reactivity were prepared from the sol-gel transition and the spinodal decomposition induced by polymers. The hydrophobicity of polymer or the calcination temperature controls the amount of the hydroxyl groups. The dried catalysts are composed of cobalt alumina hydrotalcite-like compounds up to 64%. After calcination, higher proportions of CoAl2O4 are observed in the alumina presenting a greater content of hydroxyl and hydrotalcite. The Co speciation during activation investigated by Quick X-ray absorption spectroscopy evidences that both Co3O4 and CoAl2O4 are first fully reduced to CoO and then partially transformed into point-like Co-0 nucleus. The catalysts were highly active in the ethanol steam reforming reaction; however, coke deposition leads to deactivation. This deleterious effect was minimized for catalysts operating with a CoO/Co-0 ratio close to 1:3. (AU) | |
| FAPESP's process: | 07/53073-4 - Mesoporous ceramics and multifunctional organic-inorganic hybrids prepared by sol-gel process |
| Grantee: | Celso Valentim Santilli |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 11/08673-9 - Macro-mesoporous alumina produced by sol-gel method for application in heterogeneous catalysis |
| Grantee: | Aline Ribeiro Passos |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 10/01449-3 - Development of porous heterogeneous catalysts for the conversion of renewable feedstocks |
| Grantee: | Leandro Pierroni Martins |
| Support Opportunities: | Research Grants - Young Investigators Grants |