Hydrothermal synthesis of boehmite in cellular alumina monoliths for catalytic and separation applications
authors Vitorino, NMD; Kovalevsky, AV; Abrantes, JCC; Frade, JR
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Boehmite; Cellular alumina monoliths; Hydrothermal synthesis; gamma-Alumina
keywords PARAFFIN EMULSIFIED SUSPENSIONS; MESOPOROUS MOLECULAR-SIEVES; GAMMA-ALUMINA; ADSORPTION; SURFACE; ROUTE; PHASE; FILMS
abstract 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.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2015
volume 35
issue 11
beginning page 3119
ending page 3125
digital object identifier (doi) 10.1016/j.jeurceramsoc.2015.04.040
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000356555600017

Apoio

1suponsers_list_ciceco.jpg