Preparation method of porous cerium-based composite oxide

A composite oxide, cerium-based technology, which is applied in the preparation of alumina/hydroxide, chemical instruments and methods, rare earth metal oxide/hydroxide, etc., achieves easy availability of raw materials, high yield, and simple and reliable preparation method. control effect

Active Publication Date: 2017-07-14
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The above-mentioned preparation method of porous cerium-based composite oxides still has problems in the

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  • Preparation method of porous cerium-based composite oxide
  • Preparation method of porous cerium-based composite oxide

Examples

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Embodiment 1

[0023] Weigh 4.34g of cerium nitrate and 2.15g of zirconium nitrate and dissolve them in 100mL of deionized water, then add 4.20g of citric acid, stir magnetically for 0.5 hours until the solution is colorless and transparent; add 1.82g of cetyltrimethylammonium bromide, Stir magnetically for 1 hour, add 45 mL of absolute ethanol, and continue magnetically stirring for 0.5 hour; place it in a constant temperature oven at 80°C, and let it stand for 12 hours to obtain a foam product; place the porous foam product in a muffle furnace, Calcined at 500°C for 6 hours under the atmosphere, and obtained porous cerium-zirconium composite oxide after cooling in the furnace. The X-ray diffraction spectrogram of this porous cerium-zirconium composite oxide and standard card JCPDS 38-1439 (Ce 0.6 Zr 0.4 o 2 ) coincides with the characteristic peaks; the average pore diameter of the macropores of the porous cerium-zirconium composite oxide measured by mercury porosimetry is 0.8 μm, and th...

Embodiment 2

[0025] Weigh 4.34g of cerium nitrate, 2.15g of zirconium nitrate, and 13.10g of aluminum nitrate and dissolve them in 100mL of deionized water, then add 10.50g of citric acid, stir magnetically for 0.5 hours until the solution is colorless and transparent; add 5.46g of hexadecyltrimethyl ammonium bromide, magnetically stirred for 1 hour, added 50mL of absolute ethanol, and continued to magnetically stir for 0.5 hours; placed in a constant temperature oven at 80°C, and left to stand for 12 hours to obtain a foam product; place the foam product in a muffle furnace , calcined at 500°C for 6 hours in an air atmosphere, and obtained porous cerium-based composite oxides after cooling with the furnace. The XRD spectrum shows that the porous cerium-based composite oxide is a porous cerium-zirconium-aluminum composite oxide; the porous cerium-zirconium-aluminum composite oxide has an average pore diameter of 1.5 μm and a porosity of 82.27% as measured by mercury porosimetry ; The speci...

Embodiment 3

[0027] Weigh 4.34g of cerium nitrate and 2.15g of zirconium nitrate and dissolve them in 100mL of deionized water, then add 13g of pseudoboehmite and 10.50g of citric acid, and stir magnetically for 0.5 hours; then add 5.46g of hexadecyl trimethyl bromide ammonium, add 50mL of absolute ethanol after magnetic stirring for 1 hour, continue magnetic stirring for 0.5 hours, and then place it in a constant temperature oven at 80°C; let it stand for 12 hours to obtain a foam product; place the foam product in a muffle furnace, in the air Calcined at 500°C for 6 hours under the atmosphere, and obtained porous cerium-based composite oxide after cooling in the furnace. The porous cerium-based composite oxide is a porous cerium-zirconium-aluminum composite oxide; the mesoporous BET specific surface area of ​​the porous cerium-zirconium-aluminum composite oxide is 134m 2 / g.

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Abstract

A preparation method of a porous cerium-based composite oxide includes the following steps: (1) dissolving cerium nitrate, zirconium nitrate and an aluminum source in water to obtain a water solution and adding citric acid and uniformly mixing the solution, wherein the molar ratio of cerium nitrate, zirconium nitrate, aluminum source to citric acid is 1-5:0.5-3:0-8:2-10; (2) adding a surfactant and anhydrous ethanol to the solution, uniformly stirring the solution, and allowing the solution to stand for 8-12 h at 80-120 DEG C to obtain a foamed product; (3) placing the foamed product in an air atmosphere, increasing the temperature to 500-800 DEG C at the rate of 5-10 DEG C/min, and calcining the foamed product for 4-6 h to obtain the porous cerium-based composite oxide. There are two pore structures, mesopores and macropores, in the porous cerium-based composite oxide, so that the porous cerium-based composite oxide has high specific surface area and penetrating property of the pores. The preparation method employs easy-to-obtained raw materials, is low in cost and high in yield, is simple and controllable, is free of large-size special equipment and is easy to achieve in large-scale production.

Description

technical field [0001] The invention relates to the technical field of inorganic composite materials, in particular to a preparation method of a porous cerium-based composite oxide, which can be used as a co-catalyst material in a catalyst for purifying exhaust gas of a motor vehicle. Background technique [0002] Porous materials have the advantages of low density, high specific surface area, and high porosity. Porous cerium-based composite oxides containing porous structures, especially mesoporous / macropore coexistence, have the characteristics of enhancing the surface activity of materials and improving the adsorption of molecules on the surface of materials, and due to the chemical stability and resistance of cerium-based composite oxides High-temperature oxidative properties, so it is widely used in different fields such as catalyst carriers for gas-phase catalysis, building thermal insulation materials, and fuel cell materials. [0003] At present, the methods for pre...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01G25/02C01F7/30B01D53/94
CPCB01D53/94B01D2255/2065B01D2255/20715B01D2255/2092C01F7/308C01F17/206C01G25/02C01P2002/72C01P2006/12C01P2006/16C01P2006/17
Inventor 陶进长刘志强郭秋松曹洪杨李伟朱薇高远张魁芳金明亚
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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