| Texto completo | |
| Autor(es): |
Possato, Luiz G.
;
Pereira, Elen
;
Goncalves, Rosembergue G. L.
;
Pulcinelli, Sandra H.
;
Martins, Leandro
;
Santilli, Celso V.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CATALYSIS TODAY; v. 344, p. 7-pg., 2020-03-15. |
| Resumo | |
This study presents an easy route to induce pore formation, increase the specific surface area and control the crystallite size of magnesium oxides obtained using the sol-gel method with addition of Pluronic P123 surfactant. The structural characteristics of the materials were evaluated using X-ray diffraction, N-2 physisorption isotherms, mercury intrusion porosimetry, scanning electron microscopy and CO2 temperature programmed desorption. The catalytic properties were assessed using the Knoevenagel condensation reaction. The results showed a systematic decrease of the magnesium oxide crystallinity with increased concentration of the surfactant used in the synthesis. This was associated with increase of the magnesium oxide BET area from 2 m(2)/g to over 50 m(2)/g, as well as the formation of pores in the macropore region, as confirmed by microscopy images. In addition, the surface modification resulted in CO2 chemisorption increasing from 378 mu mol/g, for the pristine MgO sample, to 1529 mu mol/g, for the porous sample, accompanied by an increase in the concentration of strong basic sites. The most porous sample presented the highest catalytic activity in the Knoevenagel condensation reaction. (AU) | |
| Processo FAPESP: | 13/50023-7 - Combinação de técnicas espectrópicas resolvidas no tempo aplicadas ao estudo estrutural de catalisadores com porosidade hierárquica |
| Beneficiário: | Leandro Pierroni Martins |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 16/12752-5 - Estudo da formação de MgO com sistema hierárquico de poros como catalisadores para reforma a vapor do etanol |
| Beneficiário: | Luiz Gustavo Possato |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 10/01449-3 - Desenvolvimento de catalisadores heterogêneos porosos para a conversão de matérias-primas renováveis |
| Beneficiário: | Leandro Pierroni Martins |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |