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Cerium-zirconium composite oxide with high specific surface area, and preparation method and application thereof

A composite oxide and specific surface area technology, which is used in the field of cerium-zirconium solid solution with high specific surface area and its preparation, can solve the problems that the performance cannot meet the requirements of emission regulations, the cerium-zirconium composite oxide has large crystal grains and weak anti-aging ability, etc. Achieve the effects of large pore volume, good low-temperature catalytic activity, and high oxygen storage capacity

Active Publication Date: 2019-09-20
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the crystal grains of the cerium-zirconium composite oxide prepared by the co-precipitation method are larger, and the specific surface area is lower. The anti-aging ability is weak, and its performance cannot meet the requirements of increasingly stringent emission regulations

Method used

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  • Cerium-zirconium composite oxide with high specific surface area, and preparation method and application thereof
  • Cerium-zirconium composite oxide with high specific surface area, and preparation method and application thereof
  • Cerium-zirconium composite oxide with high specific surface area, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 provides a composition comprising CeO 2 40%, ZrO 2 50%, La 2 o 3 5%, Pr 6 o 11 5% cerium-zirconium composite oxide, prepared by the following method:

[0054] Take 629g zirconium oxychloride and 62g ammonium cerium nitrate and add it into 1500mL ultrapure water, and add ammonia water dropwise to the solution to adjust the pH to 6.5 to obtain the sol of the first precipitate; , 65g of lanthanum nitrate and 58g of praseodymium nitrate were dissolved and mixed with ammonia water and added dropwise to the above-mentioned first precipitate, and the pH was adjusted to 10 to obtain the second precipitate of cerium hydroxide-zirconium hydroxide-lanthanum hydroxide-praseodymium hydroxide things.

[0055] Filter and wash the above precipitate for at least 3 times, then add it to a 10L reaction kettle, heat at 210°C for 36 hours to obtain a composite oxide of ceria-zirconia-lanthanum oxide-praseodymium oxide, then add 22-300g of lauric acid, and oxidize at 850°...

Embodiment 2

[0061] Example 2 provides a composition comprising CeO 2 20%, ZrO 2 73%, La 2 o 3 2%, Nd 2 o 3 5% cerium-zirconium composite oxide, prepared by the following method:

[0062] Take 918g of zirconium oxychloride and 31g of cerium ammonium nitrate and add them to 1500mL of ultrapure water, and add ammonia water dropwise to the solution to adjust the pH value to 6.5 to obtain the sol of the first precipitate; take 280g of cerium ammonium nitrate, 102g of oxychloride Zirconium, 26g of lanthanum nitrate and 65g of neodymium nitrate are dissolved and mixed with aqueous ammonia and added dropwise to the above-mentioned first precipitate, and the pH is adjusted to 11 to obtain the second product of cerium hydroxide-zirconium hydroxide-lanthanum hydroxide-neodymium hydroxide Precipitate.

[0063] Filter and wash the above precipitate for at least 3 times, then add it to a 10L reaction kettle, heat at 210°C for 36 hours to obtain a composite oxide of ceria-zirconia-lanthanum ox...

Embodiment 3

[0066] Example 3 provides a composition comprising CeO 2 25%, ZrO 2 60%, La 2 o 3 3%, Y 2 o 3 12% cerium-zirconium composite oxide, prepared by the following method:

[0067] Take 754g of zirconium oxychloride and 39g of cerium ammonium nitrate and add them to 1500mL of ultrapure water, and add ammonia water dropwise to the solution to adjust the pH to 6.5 to obtain the sol of the first precipitate; take 350g of cerium ammonium nitrate, 84g of cerium oxychloride , 26g of lanthanum nitrate and 35g of yttrium nitrate were dissolved and mixed with ammonia water and added dropwise to the above-mentioned precipitate to adjust the pH=11 to obtain the second precipitate of cerium hydroxide-zirconium hydroxide-lanthanum hydroxide-yttrium hydroxide.

[0068] Filter and wash the above precipitate for at least 3 times, then add it to a 10L reaction kettle, heat at 210°C for 36h to obtain a composite oxide of ceria-zirconia-lanthanum oxide-yttrium oxide, then add 22-300g of lauri...

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Abstract

The present invention provides a cerium-zirconium composite oxide with a high specific surface area. The cerium-zirconium composite oxide comprises cerium oxide, zirconium oxide and at least one oxide of a rare earth metal element other than cerium, and the composite oxide has a specific surface area of 80 m<2> / g or above, a pore volume of 0.50-0.60 mL / g, an oxygen storage amount of 500-1200 [mu]mol O2 / g and two-hole group distributed apertures after subjected to heat treatment at 850 DEG for 4-8 h, wherein the diameter of the first pore group is concentrated at 1-8 nm, and the diameter of the second pore group is concentrated at 20-60 nm. The cerium-zirconium composite oxide provided by the invention has a higher specific surface area and a better pore volume distribution than composite oxides prepared by existing methods, has good low-temperature catalytic activity, and can be used for catalyzing hydrocarbons, carbon oxides and / or nitrogen oxides in mobile source exhaust gas. The invention also provides a preparation method of the cerium-zirconium composite oxide. The composite oxide which has uniform element crystal lattice doping distribution and does not produce phase separation can be prepared, and is of great significance to study mobile source exhaust gas treatment purifying agents containing the cerium-zirconium composite oxide.

Description

technical field [0001] The invention relates to the technical field of tail gas purification catalyst materials, in particular to a high specific surface area cerium-zirconium solid solution and its preparation method and application. Background technique [0002] Cerium-zirconium solid solution is used as an oxygen storage material, and its performance determines the catalytic effect of the three-way catalyst. A higher specific surface area is not only related to oxygen storage capacity and anti-aging ability, but also improves the utilization rate of precious metals and reduces the cost of three-way catalysts. [0003] At present, the methods used to prepare cerium-zirconium composite oxides at home and abroad mainly include high-energy ball milling method, co-precipitation method, sol-gel method and hydrothermal method, among which co-precipitation method and hydrothermal method are the main methods of industrial production. However, the crystal grains of the cerium-zirc...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/10B01D53/86B01D53/62B01D53/56B01D53/72
CPCB01J23/002B01J23/10B01D53/8668B01D53/8628B01D53/86B01D53/62B01J2523/00B01D2257/702B01J35/613B01J35/635B01J35/647B01J2523/3706B01J2523/3712B01J2523/48B01J2523/3718B01J2523/3725B01J2523/36
Inventor 宋锡滨朱国强潘光军焦英训
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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