A Novel Synthesis Route of Mesoporous gamma Alumina from Polyoxohydroxide Aluminum

Autor(es)

Segal, Felipe Modolo ^[1] ; Correa, Michelle Fidelis ^[2] ; Bacani, Rebeca ^[3] ; Castanheira, Bruna ^[4] ; Politi, Mario Jose ^[5] ; Brochsztain, Sergio ^[4] ; Triboni, Eduardo Rezende ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Engn Quim DEQ, Escola Engn Lorena, Estr Municipal Campinho S-N, BR-12602810 Lorena, SP - Brazil

^[2] Univ Fed Sao Paulo UNIFESP, Dept Ciencias Exatas & Terra, Rua Sao Nicolau 210, BR-09913030 Diadema, SP - Brazil

^[3] Univ Sao Paulo, Escola Engn Lorena, Polo Ind, Dept Engn Mat DEMAR, Gleba Al-6 S-N, BR-12602810 Lorena, SP - Brazil

^[4] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, Santo Andre, SP - Brazil

^[5] Univ Sao Paulo, Inst Quim, Ave Prof Lineu Prestes 748, BR-05508900 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 21, n. 1 2018.
• Citações Web of Science: 3

Resumo

Mesoporous gamma-aluminas (gamma-Al2O3) were synthesized starting from an unusual precursor of polyoxohydroxide aluminum (POHA). This precursor was obtained from aluminum oxidation in alkaline water-ethanol solvent in the presence of d-glucose that induces the formation of a gel, which leads to the POAH powder after ethanolic treatment Precipitated POHAs were calcined at different temperatures (300, 400, 700 and 900 degrees C) resultmg m the metastable gamma-Al(2)0(3) phase. Whereas at 300 degrees C no gamma-Al(2)0(3) phase was formed, unexpectedly, mesoporous gamma-Al(2)0(3) was obtained at 400 degrees C having a high specific surface area (282 m(2)/g) and a narrow pore size distribution At higher temperatures, the aluminas had the expected decrease in surface area 166 m(2)/g (700 degrees C) and 129 m(2)/g (900 degrees C), respectively The structural change from POHA to alumina calcined at 400 degrees C occurs directly without the need to isolate the hydroxide or oxyhydroxide aluminum precursors Both POHA and transition aluminas were characterized by Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), N-2 sorption and Scanning Electron Microscopy (SEM) These findings show an alternative route to produce high standard aluminas. (AU)

• Processo FAPESP: 15/06064-6 - Moléculas orgânicas funcionais e óxidos inorgânicos para o desenvolvimento de novos materiais
• Beneficiário: Eduardo Rezende Triboni
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/05496-2 - Síntese e caracterização de organosílicas mesoporosas contendo imidas aromáticas e suas aplicações na área de energia
• Beneficiário: Sergio Brochsztain
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/08166-5 - Química em interfaces: interações de fármacos, peptídios e enzimas com membranas modelos
• Beneficiário: Iolanda Midea Cuccovia
• Modalidade de apoio: Auxílio à Pesquisa - Temático