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Structure and catalytic properties of sulfated zirconia foams

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Autor(es):
Alves-Rosa, Marinalva A. ; Martins, Leandro ; Hammer, Peter ; Pulcinelli, Sandra H. ; Santilli, Celso V.
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: Journal of Sol-Gel Science and Technology; v. 72, n. 2, p. 8-pg., 2014-11-01.
Resumo

Porous sulfated zirconia foams were manufactured by a simple methodology based on the sol-gel process combined with a liquid foam template that used a surfactant mixture. A block copolymer (Pluronic F-127) and an anionic surfactant [sodium dodecylsulfate (SDS)] were mixed in different proportions in order to optimize the porous and surface properties of the ceramic material. By adjusting the SDS/Pluronic ratio, it was possible to obtain sulfated zirconia with a combination of macropores and mesopores that provided high porosity (a parts per thousand 90 %) and surface area (a parts per thousand 80 m(2) g(-1)). The sulfate groups linked to the zirconia surface stabilized the tetragonal phase, to the detriment of the thermodynamically stable monoclinic phase. The sulfate groups and the tetragonal phase decreased as a function of the amount of SDS in the liquid foam template. The combined porous and structural characteristics, together with surface acidity, provided enhanced catalytic activity when the sulfated zirconia foams were employed in the isopropanol dehydration reaction. A further benefit was the selectivity towards propene and negligible formation of acetone. (AU)

Processo FAPESP: 07/53073-4 - Cerâmicas mesoporosas e hibridos orgânico-inorgânicos multifuncionais preparados pelo processo sol-gel
Beneficiário:Celso Valentim Santilli
Modalidade de apoio: Auxílio à Pesquisa - Temático
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
Processo FAPESP: 12/10215-1 - Correlação entre estrutura macro/mesoporosa, propriedades da superfície e atividade catalítica de espumas em zircônia sulfatada
Beneficiário:Marinalva Aparecida Alves Rosa
Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado