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A kind of anti-aging cerium-zirconium composite oxide and its preparation method and application

A composite oxide, anti-aging technology, applied in chemical instruments and methods, separation methods, metal/metal oxide/metal hydroxide catalysts, etc. Aging activity, uniform distribution of element lattice doping, cost reduction effect

Active Publication Date: 2022-01-04
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, there have been no relevant reports on the application of ionic liquids to the preparation of cerium-zirconium composite oxides

Method used

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  • A kind of anti-aging cerium-zirconium composite oxide and its preparation method and application
  • A kind of anti-aging cerium-zirconium composite oxide and its preparation method and application
  • A kind of anti-aging cerium-zirconium composite oxide and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 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:

[0066] Add 419g of zirconium oxychloride, 466g of cerium ammonium nitrate, 65g of lanthanum nitrate and 58g of nitrate into 1500mL of ultrapure water, stir for 0.5h to obtain a clear solution, which is introduced into an aqueous ammonia solution to obtain the first precipitate; continue Add the remaining 279g of zirconyl chloride and 155g of ammonium cerium nitrate into 1500mL of pure water, stir for 0.5h, introduce into the above first precipitate, and adjust the pH value to 10 to obtain cerium hydroxide - zirconium hydroxide - Mixed precipitation of lanthanum hydroxide-praseodymium hydroxide.

[0067] Filter and wash the above-mentioned precipitate for at least 3 times, then put it into a 10L high-pressure reactor, and add 5L of the mixed solvent of the above-mentioned ionic liquid (salicylic acid / t...

Embodiment 2

[0073] 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:

[0074] Add 559g of zirconium oxychloride, 249g of cerium ammonium nitrate, 26g of lanthanum nitrate and 65g of neodymium nitrate into 1500mL of ultrapure water, stir for 0.5h to obtain a clear solution, introduce the solution into an aqueous ammonia solution to obtain the first precipitate; The remaining 461g of zirconyl chloride and 62g of cerium ammonium nitrate were added to 1500mL of pure water, stirred for 0.5h, introduced into the above-mentioned first precipitate, and adjusted to pH 10 to obtain cerium hydroxide-zirconium hydroxide-hydroxide Mixed precipitation of lanthanum-neodymium hydroxide.

[0075] Filter and wash the above-mentioned precipitate for at least 3 times, then put it into a 10L high-pressure reactor, and add 5L of the mixed solvent of the above-mentioned ionic liquid (salicylic ...

Embodiment 3

[0078] 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:

[0079]Add 559g of zirconium oxychloride, 280g of ceric ammonium nitrate, 39g of lanthanum nitrate and 102g of yttrium nitrate into 1500mL of ultrapure water, stir for 0.5h to obtain a clear solution, introduce the solution into an aqueous ammonia solution to obtain the first precipitate; The remaining 279g of zirconium oxychloride and 109g of cerium ammonium nitrate were added to 1500mL of pure water, stirred for 0.5h, introduced into the above-mentioned first precipitate, and adjusted to pH 10 to obtain cerium hydroxide-zirconium hydroxide-lanthanum hydroxide - Mixed precipitation of yttrium hydroxide.

[0080] Filter and wash the above-mentioned precipitate for at least 3 times, then put it into a 10L high-pressure reactor, and add 5L of the mixed solvent of the above-mentioned ionic liquid (salicyli...

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Abstract

The present invention provides an anti-aging cerium-zirconium composite oxide having at least 80m 2 / g specific surface area, 0.55~0.80ml / g pore volume, 500~1200μmol O 2 Oxygen storage capacity per g, and the pore diameter showing a distribution of two pore groups, wherein the diameter of the first pore group is concentrated in the range of 3-10 nm, and the diameter of the second pore group is concentrated in the range of 15-80 nm. The cerium-zirconium composite oxide provided by the present invention shows remarkable anti-aging activity, and also shows better low-temperature catalytic activity, and can be used to catalyze hydrocarbons, carbon oxides and / or nitrogen oxides in the tail gas of mobile sources . The preparation method of the cerium-zirconium composite oxide provided by the invention does not use surfactants, reduces sewage discharge, is more environmentally friendly, and the ionic liquid and absolute ethanol can be recovered through simple distillation, which greatly reduces the cost, and is especially suitable for Industrial production, and at the same time, composite oxides with more uniform element lattice doping distribution and no phase separation can be obtained, which is of great significance to the research of mobile source tail gas treatment purifiers containing cerium-zirconium composite oxides.

Description

technical field [0001] The invention relates to the technical field of mobile source tail gas purification and catalysis, in particular to a preparation method and application of an anti-aging cerium-zirconium composite oxide. Background technique [0002] With the successive implementation of the National VI standard in my country, the emission standards of automobile exhaust are more stringent. Therefore, higher requirements are put forward for catalysts for automobile exhaust treatment. As an important part of the catalyst, the performance of oxygen storage materials needs to be further improved, the most important thing is to improve their anti-aging performance. [0003] The anti-aging performance of cerium-zirconium composite oxide is not only related to its composition, but also has an important relationship with its synthesis process. At present, hydrothermal synthesis is one of the main processes for the synthesis of high-performance cerium-zirconium solid solutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J35/10B01D53/94B01D53/56B01D53/62B01D53/72
CPCB01J23/10B01J23/002B01J35/1014B01J35/1042B01D53/945B01J2523/00B01J2523/3706B01J2523/3712B01J2523/48B01J2523/3718B01J2523/3725B01J2523/36
Inventor 宋锡滨朱国强潘光军焦英训
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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