Method for stabilizing anatase phase nano titanium oxide and cubic phase nano zirconium oxide

Abstract

This invention relates to a method for stabilizing, under high temperature, anatase phase nanometer titanium oxide (TO) or tetragonal phase nanometer zirconium oxide (ZO). The substantive feature is that: the obove-mentioned TO or ZO is treated, under particular temperature, by impregnation in solution containing lanthanum nitrate as stabilizator, and then being dried, sintered to obtain the final product powder. This invention is characterized by: (1), very low content of stabilizator in said powders, calculated as lanthanum oxide, being respectively 3% and 0.3% of the single layer dispersion on the TO and ZO; (2), this inventive products can be stabilized under at least 900deg.C; (3) said lanthanum oxide dispersed on the TO and ZO can effectively eliminate the growth of the particles ofthe TO and ZO, and eliminate agglutination, and decrease in the specific surface area.

Description

Method for stabilizing anatase phase nano-titanium oxide and tetragonal phase nano-zirconia technical field The invention relates to a method capable of stabilizing anatase phase nano-titanium oxide and tetragonal phase nano-zirconia at relatively high roasting temperature. Background technique As an important inorganic functional material, titanium oxide is widely used in modern industry, agriculture, chemical industry, light industry, metallurgy, electrical appliances, building materials and other industries, and has a close relationship with the national economy. Titanium oxide is a polymorphic compound, which mainly has two crystal phases: anatase and rutile. Anatase exists stably at relatively low temperatures and transforms into rutile during gradual calcination. As an important wide-bandgap semiconductor, photocatalytic properties are the most important properties of nano-titanium oxide. Titanium oxide not only has high photocatalytic activity, but also has the a...

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Problems solved by technology

In summary, although the above methods can effectively stabilize anatase phase titanium oxide or tetragonal crystal phase zirconia, the amount of stabilizer required is relatively high

Furthermore, studies on the crystal phase stability of titania or zirconia impregnated into stabilizer solutions with respect to anatase or tetragonal phases have not been reported so far.

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