Synthesis and textural evolution of alumina particles with mesoporous structures
- 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, Journal Name: Journal of Solid State Chemistry Journal Issue: 6 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
77 NANOSCIENCE AND NANOTECHNOLOGY
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCINATION
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
CHLORINE IONS
COHERENT SCATTERING
DECOMPOSITION
DESORPTION
DIFFRACTION
DISPERSIONS
DISTILLATION
ELECTRON MICROSCOPY
HOMOGENEOUS MIXTURES
IONS
LAMELLAE
MICROSCOPY
MIXTURES
NANOSTRUCTURES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRECIPITATION
PYROLYSIS
SCATTERING
SEPARATION PROCESSES
SOLUTIONS
SORPTION
SPECIFIC SURFACE AREA
SULFATES
SULFUR COMPOUNDS
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMOCHEMICAL PROCESSES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION