Cubic phase cerium and zirconium based composite oxide with high specific surface area and preparation method thereof

A composite oxide and high specific surface area technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, separation methods, etc., can solve problems such as complex process and low specific surface area of ​​catalyst products, and achieve The reaction process is simple, the drying equipment requirements are low, and the effect of high specific surface area

Active Publication Date: 2011-11-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method or process is complicated or the specific surface area of ​​the final catalyst product is low at high temperature

Method used

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  • Cubic phase cerium and zirconium based composite oxide with high specific surface area and preparation method thereof
  • Cubic phase cerium and zirconium based composite oxide with high specific surface area and preparation method thereof
  • Cubic phase cerium and zirconium based composite oxide with high specific surface area and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] According to the molar ratio of Ce, Zr, Pr, and Nd as 1:2:0.23:0.25, dissolve the nitrates of Ce, Zr, Pr, and Nd in deionized water, and stir well to obtain a salt solution with a concentration of 0.2 mol / L . Add ammonia water dropwise to the mixed solution until the pH is 9~10, filter and wash with deionized water until pH = 7 to obtain a filter cake; transfer the filter cake to a beaker, and then pour absolute ethanol, the liquid level of the beaker must be higher than Filter cake, stirred and left to stand, and then suction filtered to obtain the precipitate exchanged with anhydrous ethanol, which was supercritically dried under supercritical conditions of 50°C and pressure of 10MPa; kept under supercritical conditions for 5 hours, and released slowly at constant temperature gas to obtain the Ce-Zr-Pr-Nd composite oxide precursor; treat the Ce-Zr-Pr-Nd composite oxide precursor in the air atmosphere at 1000°C for 12 hours to obtain the Ce-Zr-Pr-Nd composite oxide ma...

Embodiment 2

[0040] According to the molar ratio of Ce, Zr, Pr, Nd is 1:1.8:0.32:0.32, dissolve the nitrates of Ce, Zr, Pr, Nd in deionized water, after stirring evenly, add ammonia water dropwise to the mixed solution to pH 9~10, centrifugal washing to pH=7, centrifugal spray drying, inlet temperature 130~250°C, outlet temperature 100~120°C, to obtain Ce-Zr-Pr-Nd composite oxide precursor; Ce -Zr-Pr-Nd composite oxide precursor was treated in air atmosphere at 1000°C for 12 hours to obtain Ce-Zr-Pr-Nd composite oxide with a specific surface area of ​​38.2 m 2 / g. The Ce-Zr-Pr-Nd composite oxide precursor in N 2 Treat at 1000°C for 12 hours in the atmosphere to obtain Ce-Zr-Pr-Nd composite oxide with a specific surface area of ​​41.5 m 2 / g.

Embodiment 3

[0042] According to the molar ratio of Ce, Zr, Pr, Nd, La is 1:2:0.2:0.21:0.16, dissolve the nitrates of Ce, Zr, Pr, Nd, La in deionized water, stir well, add to the mixed solution Add ammonia water dropwise to pH 9~10, filter and wash with deionized water until pH = 7; exchange the water in the precipitate with absolute ethanol. Carry out supercritical drying, supercritical condition is 50 ℃, pressure 15MPa; Keep 5 hours under supercritical condition, release gas slowly at constant temperature, obtain Ce-Zr-Pr-Nd-La composite oxide precursor; Ce-Zr - The Pr-Nd-La composite oxide precursor was calcined at 550 °C for 2 hours in an air atmosphere, and its specific surface area was 174.5 m 2 / g. .Treat in air atmosphere at 1000℃ for 12 hours to get Ce-Zr-Pr-Nd-La composite oxide with a specific surface area of ​​54.3 m 2 / g.

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Abstract

The invention discloses a cubic phase cerium and zirconium based composite oxide with high specific surface area. Rare earth elements are doped in the cerium-zirconium composite oxide and are selected from two or three of Pr, Nd and La, wherein the molar ratio of Zr to Ce is (1.8-2.5):1; the molar ratio of Pr to Ce is (0-0.32):1; the molar ratio of Nd to Ce is (0-0.32):1; the molar ratio of La toCe is (0-0.16):1; and the cerium and zirconium based composite oxide exists in a form of cerium-zirconium solid solution. The invention also discloses a preparation method of the cerium and zirconiumbased composite oxide. The composite oxide is prepared through different precursor precipitating and drying methods; the method has the advantages of simple reaction process and low requirements on drying equipment; the obtained cerium and zirconium based composite oxide has high specific surface area, high thermal stability and high oxygen storage and discharge capacity; and after sintering is performed at the temperature of 1,000 DEG C for 12 hours, the specific surface area is more than 35m<2>/g, particularly more than 60m<2>/g.

Description

technical field [0001] The invention relates to a cerium-zirconium-based composite oxide and a preparation method thereof, in particular to a cubic phase cerium-zirconium-based composite oxide with high specific surface area and high oxygen storage capacity and a preparation method thereof. Background technique [0002] Cerium-based composite oxides are widely used in heterogeneous catalysis [J. Ka?par, et al., Catal. Today 50 (1999) 285–298.], polishing agent [V.D. Kosynkin, et al., J. Alloys Compd . 303–304 (2000) 421–425], high temperature ceramics [H. Kaneko, et al., J. Mater. Sci. 43 (2008) 3153–3161.], sensor materials [G. Neri, et al., Sens. Actuators B 114 (2006) 687–695.], fuel cells [A. Atkinson, et al., Nat. Mater. 3 (2004) 17–27.] and other fields, CeO 2 Has the ability to store and release oxygen, but CeO 2 poor thermal stability. In CeO 2 Zr 4+ Can improve CeO 2 The thermal stability of the formed cerium-zirconium composite oxide also maintains good oxyge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10B01D53/94
Inventor 张昭良王姿姿杨家富张业新辛颖魏少杰
Owner UNIV OF JINAN
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