Catalytic performance of texturally improved Al-Mg mixed oxides derived from emulsion-synthesized hydrotalcites

Autor(es)

Petrolini, Davi D. ^[1] ; da Silva Neto, Alano V. ^[2] ; Urquieta-Gonzalez, Ernesto A. ^[2] ; Pulcinelli, Sandra H. ^[1] ; Santilli, Celso V. ^[1] ; Martins, Leandro ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, UNESP, Inst Quim, Rua Prof Francisco Degni 55, BR-14800900 Araraquara, SP - Brazil

^[2] Univ Fed Sao Carlos, Ctr Pesquisas Mat Avancados & Energia, Rodovia Washington Luis, Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RSC ADVANCES; v. 8, n. 11, p. 6039-6046, 2018.
• Citações Web of Science: 2

Resumo

Mixed oxides of aluminum and magnesium derived from hydrotalcites were prepared by means of a sol-gel method mediated by an emulsified sol as pore template. The emulsion consisted of ethanol as the continuous phase and n-dodecane droplets as the dispersed phase, which was stabilized by the presence of the surfactant Pluronic P123. The use of such an emulsion was essential for obtaining materials with a porous structure that were assessed by mercury intrusion porosimetry and nitrogen physisorption. Additional characterization by NH3 and CO2 temperature programmed desorption confirmed that despite the enhancement of their textural properties, the number of acid and base sites was reduced in comparison to a reference and conventionally prepared Al-Mg mixed oxide, as a consequence of the depletion of surface hydroxyls during condensation of the precursors around the nonpolar droplets of the emulsion. Catalytic conversion of 2-propanol under conditions of controlled mass and heat diffusion on the texturally improved Al-Mg mixed oxides evidenced the preparation of a more effective catalyst than the poorly porous reference. (AU)

• Processo FAPESP: 13/01328-0 - Metodologias avançadas de síntese de zeólitas hierárquicas e caracterização por diferentes técnicas para melhor utilização de materiais microporosos em catálise heterogênea
• Beneficiário: Leandro Pierroni Martins
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/05321-5 - Síntese de catalisadores com poros estruturados derivados da hidrotalcita por uso combinado de química sol-gel, tensoativos e emulsão
• Beneficiário: Davi Domingos Petrolini
• Modalidade de apoio: Bolsas no Brasil - Doutorado