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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 energy consumption, low specific surface area of ​​aging products, limitations, etc., to reduce energy consumption, The effect of excellent pore size distribution and short heating time

Inactive Publication Date: 2019-10-29
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. A precursor solution of the composite oxide is prepared, and the precursor solution and an alkali solution are subjected to a titration reaction at room temperature using a co-precipitation method under high-speed stirring in an environment of pH=8.5 to 9.5. , the composite hydroxide slurry obtained by the titration reaction is rapidly heated to 50-80°C to grow the crystal grains, and is stirred at this temperature for 1-3 hours. Add alkali solution to maintain the pH value of the composite hydroxide slurry, and then cool to room temperature. The crystal grains are left to grow slowly for 1 to 6 days, and then the composite hydroxide slurry is aged at 90 to 95°C for 6 to 8 hours to grow the particles, and finally the composite oxide is obtained by roasting at 600 to 1000°C. The texture properties of the composite oxide prepared by the present invention have the characteristics of higher specific surface, larger pore volume and wider pore size distribution than the sample prepared by the traditional constant temperature titration reaction. It is suitable for mobile sources such as motor vehicle exhaust purification, stationary sources such as catalytic combustion or easy volatilization. It can be used as a carrier material in exhaust gas treatment or directly as a catalyst, so it has a wide range of applications.

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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Patent Type & Authority Patents(China)
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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