NDLI: Highly Dispersed Zirconium-Containing Oxide Systems: Synthesis, Properties, and Applications

Content Provider	Springer Nature Link
Author	Ivava, A. S.
Copyright Year	2001
Abstract	The formation of the phase composition, dispersion, pore structure, and surface state of binary zirconium-containing systems was examined depending on the nature and concentration of the second component, preparation conditions and procedures, and thermal treatment conditions. Various types of interactions were found, which are governed by the nature of the second component and the treatment temperature. The effects of surfactants on the physicochemical properties of precipitates depend on the conditions of synthesis: the surfactant amount retained by a precipitate at pH 3–4 is greater than that at pH 9 by an order of magnitude. The thermolysis of samples synthesized at acidic pH, along with dehydration and dehydroxylation, is accompanied by the decomposition and degradation of surfactants. Because of this, certain compounds and their fragments capable of reducing corresponding phases are removed stepwise. Highly dispersed compositions were obtained at 110–400°C with a minimum particle size of 2.5–16 nm; at 700°C, the particle size was no higher than 20 nm. The ratio between the ionic radii of added and main components is a factor determining the dispersion of formed phases. In this case, changes in the nature of surfactants and in the conditions of a particular synthesis make it possible to prepare highly dispersed systems with monomesoporous structures. The total volume and the average diameter of pores can be controlled over wide limits.
Starting Page	354
Ending Page	365
Page Count	12
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	42
Issue Number	3
e-ISSN	16083210
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

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