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

A technology of nano-titanium oxide and nano-zirconium oxide, applied in the direction of titanium oxide/hydroxide, zirconium oxide, titanium dioxide, etc., can solve the problems of unreported and high stabilizer, achieve simple operation, inhibit growth, inhibit specific surface area the effect of falling

Inactive Publication Date: 2008-04-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

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Embodiment 1

[0036] As an illustrative example, the titanium oxide carrier can be prepared as follows: add 100 ml of absolute ethanol and 20 ml of tetrabutyl titanate into a 500 ml beaker, and mix well. Ammonia water was added dropwise to the above mixed solution until the pH was about 9, and the precipitate was aged at room temperature for 12 hours. The precipitate was filtered and washed twice with deionized water and absolute ethanol respectively, then dried at 100°C, and then calcined at 500°C to obtain a titanium oxide carrier, marked as TiO 2 -500. The La(NO 3 ) 3 The solution was dropped onto the titania support (the added La(NO 3 ) 3 to La 2 o 3 Count, La 2 o 3 The amount is La 2 o 3 in TiO 23% of the dispersion of the upper single layer, that is, 0.5wt% of titanium oxide), stir evenly, and let it stand for 4 hours; then dry it in a water bath, stir vigorously during it; then put it in an oven and keep it at 120°C overnight; finally bake it at 900°C . The samples prepa...

Embodiment 2

[0047] As an illustrative example, a zirconia support can be prepared as follows: zirconium nitrate (Zr(NO 3 ) 2 ) into a 0.4M solution, and then slowly drop the solution into the concentrated ammonia solution. The pH of the solution was then adjusted to around 13 with 2M NaOH. After aging for 12 hours, the precipitate was filtered and washed thoroughly with distilled water until the pH of the filtrate was 7. The precipitate was dried at 110°C for about 12 hours, then calcined at 400°C for 4 hours as a zirconia support, and labeled as ZrO 2 -400. Similarly, La(NO 3 ) 3 The solution was dropped onto the zirconia support (the added La(NO 3 ) 3 to La 2 o 3 Count, La 2 o 3 Quantity is La 2 o 3 in ZrO 2 0.3% of the dispersion of the upper single layer, which is 0.1wt% of zirconia), stir evenly, and let it stand for 4 hours; then dry it in a water bath, stir vigorously during it; then put it in an oven and keep it at 110°C overnight; then bake it at 900°C , the sample...

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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 of the TO and ZO, and eliminate agglutination, and decrease in the specific surface area.

Description

technical field [0001] 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 [0002] 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. [0003] 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 advantages of acid, alkali and photochemical corrosion resistance, non-...

Claims

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Application Information

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IPC IPC(8): C01G23/047C01G25/02
Inventor 李灿张静冯兆池徐倩邱石
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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