Synthesis and textural evolution of alumina particles with mesoporous structures

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

OSTI ID:21432457

Xun, Liu ^[1]; Jinchun, Yao; Hongjin, Lv; Cheng, Huang ^[1]

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1. College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072 (China)

Alumina particles with mesostructures were synthesized through a chemical precipitation method by using different inorganic aluminum salts followed by a heterogeneous azeotropic distillation and calcination process. The obtained mesoporous {gamma}-alumina particles were systematically characterized by the X-ray diffraction, transmission electron microscopy and nitrogen adsorption-desorption measurement. Effects of the aluminum salt counter anion, pH value and the azeotropic distillation process on the structural or textural evolution of alumina particles were investigated. It is found that Cl{sup -} in the reaction solution can restrain the textural evolution of the resultant precipitates into two-dimensional crystallized pseudoboehmite lamellae during the heterogeneous azeotropic distillation, and then transformed into {gamma}-Al{sub 2}O{sub 3} particles with mesostructures after further calcination at 1173 K, whereas coexisting SO{sub 4}{sup 2-} can promote above morphology evolution and then transformed into {gamma}-Al{sub 2}O{sub 3} nanofibers after calcination at 1173 K. Moreover nearly all materials retain relatively high specific surface areas larger than 100 m{sup 2} g{sup -1} even after calcinations at 1173 K. - Graphical abstract: Co-existing Cl{sup -} is beneficial for the formation of {gamma}-alumina nanoparticles with mesostructures during the precipitation process. Interparticle and intraparticle mesopores can be derived from acidic solution and near neutral solution, respectively.

• OSTI ID: 21432457
• Journal Information: Journal of Solid State Chemistry, Vol. 183, Issue 6; Other Information: DOI: 10.1016/j.jssc.2010.04.020; PII: S0022-4596(10)00153-2; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ADSORPTION
ALUMINIUM OXIDES
CALCINATION
CHLORINE IONS
DESORPTION
DISTILLATION
LAMELLAE
NANOSTRUCTURES
PRECIPITATION
SOLUTIONS
SPECIFIC SURFACE AREA
SULFATES
SYNTHESIS
TEMPERATURE RANGE 1000-4000 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
COHERENT SCATTERING
DECOMPOSITION
DIFFRACTION
DISPERSIONS
ELECTRON MICROSCOPY
HOMOGENEOUS MIXTURES
IONS
MICROSCOPY
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PYROLYSIS
SCATTERING
SEPARATION PROCESSES
SORPTION
SULFUR COMPOUNDS
TEMPERATURE RANGE
THERMOCHEMICAL PROCESSES