| Full text | |
| Author(s): |
Possato, Luiz G.
;
Pulcinelli, Sandra H.
;
Martins, Leandro
;
Briois, Valerie
;
Santilli, Celso, V
Total Authors: 5
|
| Document type: | Journal article |
| Source: | CHEMCATCHEM; v. 14, n. 21, p. 15-pg., 2022-10-18. |
| Abstract | |
Operando time-resolved X-ray absorption spectroscopy (XAS) was used to determine nickel species supported on porous MgO during the ethanol steam reforming reaction. The Principal Component Analysis (PCA) of the nickel K-edge XAS spectra revealed Ni(OH)(2), NiMgO, and metallic Ni during the activation and reaction of the catalysts. The Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS) method for the time-resolved XAS spectra data permitted to calculate the concentration of species during the activation and reaction steps and to determine the formation of NiMgO and nickel reduction degree. The samples prepared with surfactants, Ni10MgO-F127 and Ni10MgO-P123, showed less nickel reduction (less than 30 %) but were more active and stable than the reference Ni10MgO catalyst, which reduced 52 %. It happened due to the smaller particle size and a larger specific area of the porous supports. The samples synthesized without Pluronic deactivated, and ethanol dehydrogenation became predominant instead of the ethanol steam reforming. (AU) | |
| FAPESP's process: | 19/12486-1 - Multi-User Equipment approved in grant 2018/01258-5: gas chromatograph |
| Grantee: | Leandro Pierroni Martins |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 14/11952-5 - Study of the formation of ordered hierarchical materials by a supramolecular structure in emulsions using zeolite precursors |
| Grantee: | Thiago Faheina Chaves |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 18/01258-5 - Novel chemical catalytic and photocatalytic processes for the direct conversion of methane and CO2 to products |
| Grantee: | José Maria Correa Bueno |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 16/12752-5 - Study of MgO formation with hierarchical pores system as a catalyst for ethanol steam reforming |
| Grantee: | Luiz Gustavo Possato |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |