resumo
For the first time, controlled hydrothermal functionalization was performed in porous cellular alpha-Al2O3 ceramics, targeting potential separation and catalytic processes for sustainable chemistry applications. Growth of micro-nano hierarchical structures of boehmite (gamma-AlOOH) with high aspect ratio was assessed by SEM/EDS/XRD/FTIR. The pH and precursors concentration determine the growth mechanism and final functionalization level. The obtained results anticipate strategies for promoting formation of boehmite at the pores surfaces and tuning its morphology, including pre-treatments of the cellular matrix to increase the concentration of the surface defects and preliminary saturation of the pores with appropriate precursors to achieve uniform functionalization. Thus grown boehmite structures can be easily converted to gamma-Al2O3 by thermal treatment while retaining the former distribution and aspect ratio, opening new possibilities for preparation of gamma-Al2O3 supported catalysts. (C) 2015 Elsevier Ltd. All rights reserved.
palavras-chave
PARAFFIN EMULSIFIED SUSPENSIONS; MESOPOROUS MOLECULAR-SIEVES; GAMMA-ALUMINA; ADSORPTION; SURFACE; ROUTE; PHASE; FILMS
categoria
Materials Science
autores
Vitorino, NMD; Kovalevsky, AV; Abrantes, JCC; Frade, JR
nossos autores
Andrei Kavaleuski
Investigador principal
João Carlos de Castro Abrantes
Professor Adjunto
Jorge Ribeiro Frade
Professor(a) Jubilado(a)
Nuno Miguel Dias Vitorino
Bolseiro de pós-Doutoramentoagradecimentos
This work was developed in the scope of the project CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013, PTDC/CTM-ENE/2073/2012 and PEst-C/CTM/LA0011/2013, and grants SFRH/BPD/99367/2013 and IF/00302/2012), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement.; SEM facilities were funded by FEDER Funds through QREN - Aviso SAIECT-IEC/2/2010, Operacao NORTE-07-0162-FEDER-000050.