A Novel Synthesis Route of Mesoporous gamma Alumina from Polyoxohydroxide Aluminum

A Novel Synthesis Route of Mesoporous gamma Alumina from Polyoxohydroxide Aluminum

Author Segal, Felipe Modolo Google Scholar
Correa, Michelle Fidelis Autor UNIFESP Google Scholar
Bacani, Rebeca Google Scholar
Castanheira, Bruna Google Scholar
Politi, Mario Jose Google Scholar
Brochsztain, Sergio Google Scholar
Triboni, Eduardo Rezende Google Scholar
Abstract 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.
Keywords aluminum and d-glucose
EtOH-H2O alkaline medium
chemical preparation
mesoporous gamma-Al2O3
xmlui.dri2xhtml.METS-1.0.item-coverage Sao Carlos
Language English
Sponsor Fundacao de Apoio a Pesquisa do Estado de Sao Paulo - FAPESP
CAPES
CNPq
Grant number FAPESP: 2015/06064-6, 2013/08166-5, 2016/05496-2
Date 2018
Published in Materials Research-Ibero-American Journal Of Materials. Sao Carlos, v. 21, n. 1, p. -, 2018.
ISSN 1516-1439 (Sherpa/Romeo, impact factor)
Publisher Univ Fed Sao Carlos, Dept Engenharia Materials
Extent -
Origin http://dx.doi.org/10.1590/1980-5373-MR-2017-0674
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000432383900037
SciELO ID S1516-14392018005004109 (statistics in SciELO)
URI https://repositorio.unifesp.br/handle/11600/54306

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