NDLI: Influence of aluminium precursor on physico-chemical properties of aluminium hydroxides and oxides Part II. Al(ClO$_{4}$)$_{3}$·9H$

Content Provider	Springer Nature Link
Author	Pacewska, Barbara Kluk Płoskońska, Olga Szychowski, D.
Copyright Year	2006
Abstract	Aluminium hydroxide was precipitated during a hydrolysis of aluminium perchlorate in ammonia medium. The materials were studied with the following methods: thermal analysis, IR spectroscopy, X-ray diffraction, low-temperature nitrogen adsorption and adsorption–desorption of benzene vapours.Freshly precipitated boehmite had a high value of S$_{BET}$=211 m$^{2}$ g$^{–1}$ determined from nitrogen adsorption, good sorption capacity for benzene vapours, developed mesoporous structure and hydrophobic character. After prolonged refluxing at elevated temperature its crystallinity increased which was accompanied by an increase of specific surface determined from nitrogen adsorption up to 262m$^{2}$g$^{–1}$ , decrease of sorption capacity for benzene vapours and stronger hydrophobic character. The calcinations of all boehmites at temperature up to 1200°C resulted in formation of à-Al$_{2}$O$_{3}$ via transition form of γ-, δ- and θ-Al$_{2}$O$_{3}$. The samples of aluminium oxides obtained after calcination at 550 and 900°C were characterised with high values of specific surface area of 205–220 and 138–153 m$^{2}$ g$^{–1}$ , respectively. The SBET values calculated for the oxide samples derived from aged hydroxides and calcined at 1200°C are higher than for the analogous sample prepared without the ageing step. It was concluded that the process of ageing at elevated temperature developed thermal stability of aluminium oxides.
Starting Page	751
Ending Page	760
Page Count	10
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	86
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-07-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	anion boehmite metastable aluminium oxides thermal decomposition Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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