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Composite oxide and preparation method thereof

A composite oxide and composite hydroxide technology, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of limitation, low specific surface area of ​​aging products, energy consumption, etc., and achieve short heating time, Excellent pore size distribution and reduced energy consumption

Inactive Publication Date: 2017-06-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method consumes energy, and the specific surface area of ​​the aging product is low, which limits further applications.

Method used

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  • Composite oxide and preparation method thereof
  • Composite oxide and preparation method thereof
  • Composite oxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment prepares Y 2 o 3 -ZrO 2 -Al 2 o 3 composite oxide, the composite oxide, Y 2 o 3 The mass percentage is 15%, ZrO 2 The mass percentage is 35%, Al 2 o 3 The mass percentage is 50%, and the preparation steps are as follows:

[0030] (1) According to Y in the composite oxide 2 o 3 , ZrO 2 、Al 2 o 3 Weigh yttrium nitrate, zirconium nitrate and aluminum nitrate, then prepare yttrium nitrate, zirconium nitrate and aluminum nitrate at room temperature with water to make a salt solution with a total mass concentration of 5%, then add Y 2 o 3 , ZrO 2 、Al 2 o 3 Total mass 10% polyvinyl alcohol was stirred at room temperature for 2 hours;

[0031] (2) The buffer solution (pH=12) that will add the saline solution of polyvinyl alcohol and ammoniacal liquor and ammonium bicarbonate composition is in jacketed reactor at room temperature at the stirring speed of 400 rev / mins and is titrated concurrently, adding polyvinyl alcohol The titration rate of t...

Embodiment 2

[0052] This embodiment is the same as the composite oxide prepared in Example 1, and the preparation steps are as follows:

[0053] Step (1) and (2) are with embodiment 1 step (1) and (2);

[0054] (3) After the titration, divide the generated composite hydroxide slurry into six samples, and rapidly raise the temperature of the six samples to 50°C, 55°C, 60°C, 70°C, 75°C and 80°C, and continue Stir for 2 hours, replenish the buffer solution composed of ammonia water and ammonium bicarbonate to keep the pH value of the composite hydroxide slurry at 9, then cool to room temperature and let stand for 1 day;

[0055] Steps (4), (5) are the same as Steps (4) and (5) of Example 1, except that the 6 samples are only calcined at 1000° C. for 5 hours.

[0056] 6 parts of 15% Y prepared at different temperatures after titration 2 o 3 -35% ZrO 2 -50%Al 2 o 3 Composite oxides were used in low temperature N 2 The texture properties were measured by adsorption-desorption, and the res...

Embodiment 3

[0061] The preparation process conditions of this embodiment and embodiment 1 are the same, the difference is that this embodiment according to the stoichiometric ratio Y 2 o 3 :ZrO 2 :Al 2 o 3 =20:15:65 (wt) take by weighing yttrium nitrate, zirconium nitrate and aluminum nitrate, the composite oxide obtained is 20%Y 2 o 3 -15% ZrO 2 -65% Al 2 o 3 .

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Abstract

The invention discloses a composite oxide and a preparation method thereof. The preparation method is characterized in that a precursor solution of the composite oxide is prepared; the precursor solution and an alkaline solution are subjected to titration reaction with high-speed stirring under room temperature according to a coprecipitation method, wherein the pH in the titration reaction is 8.5-9.5; composite oxide sizing obtained in the titration reaction is quickly heated to be 50-80 DEG C to enable the growing of crystal grains, and the composite oxide sizing is stirred for 1-3 hours under 50-80 DEG C; the alkaline solution is supplemented to maintain the pH of the composite oxide sizing; the composite oxide sizing is cooled to the room temperature and stood for 1-6 days to enable the slow developing of the crystal grains; then the composite oxide sizing is aged for 6-8 hours under the temperature of 90-95 DEG C to enable the developing of particles; finally, the composite oxide sizing is roasted at the temperature of 600-1000 DEG C to obtain the composite oxide. Compared with a sample prepared by a traditional constant-temperature titration reaction, the composite oxide prepared by the method has the characteristics of being high in specific surface area, high in pore volume, and wide in pore size distribution; the composite oxide can be used as a carrier material in exhaust cleaning of moving sources such as a motor vehicle, and treatment of solid sources such as catalytic combustion or volatile gas, and can also be directly used as a catalyst, so that the composite oxide is applicable to various application fields.

Description

technical field [0001] The invention belongs to the field of composite oxides, in particular to composite oxides with excellent texture properties and a preparation method thereof. Background technique [0002] In oxygen storage materials, high temperature resistant and high specific surface area Al 2 o 3 Material, ZrO 2 Among materials and various composite oxide support materials or catalysts, the texture properties of composite oxides (including specific surface area and pore volume size and pore size distribution in oxides), especially the texture properties after high-temperature calcination, are the key to evaluating support materials or catalysts. An important performance indicator of thermal stability. The carrier material with high specific surface area is conducive to the dispersion of active components, so that the active components can fully play their role, and can also increase the adsorption amount of reactant molecules, thereby reducing the amount of activ...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01D53/94B01D53/86
CPCB01D53/86B01D53/94B01J23/002B01J23/10B01J2523/00B01J35/613B01J35/635B01J35/633B01J35/647B01J2523/31B01J2523/36B01J2523/48
Inventor 任成军陈耀强王健礼陈宇圣
Owner SICHUAN UNIV
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