Cerium-zirconium composite oxide and preparation method thereof

A composite oxide, cerium zirconium technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problems of high cost, unsuitable for industrial production, etc. The effect of large pore volume, good low-temperature catalytic activity, and high oxygen storage capacity

Active Publication Date: 2019-10-29
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of the two-fluid spray feeding equipment is high, and the amount of feed is small, which is suitable for small-dose preparation in the laboratory, but not suitable for industrial production.

Method used

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  • Cerium-zirconium composite oxide and preparation method thereof
  • Cerium-zirconium composite oxide and preparation method thereof
  • Cerium-zirconium composite oxide and preparation method thereof

Examples

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preparation example Construction

[0046] The invention provides a method for preparing a cerium-zirconium composite oxide, comprising the following steps:

[0047] S1, preparation of seed crystals: dissolving zirconium oxychloride in pure water to prepare a solution, and adjusting the pH value to 1.2-2.0. Add the zirconium oxychloride solution into the autoclave, heat and react at 150°C to 180°C for 24 hours, and obtain a white precipitate, which is filtered and washed for later use;

[0048] S2, liquid preparation: dissolving cerium source, zirconium source and other rare earth elements except cerium in pure water to obtain a mixed solution;

[0049] S3, Precipitation: adding the seed crystal obtained in step S1 into the ammonia solution, introducing the mixed solution obtained in step S2 into it, adjusting the pH to 10-11 to obtain a mixed precipitate, and washing until there is no chloride ion;

[0050] S4, hydrothermal: introduce the mixed precipitate obtained in step S3 into an autoclave and heat at 210°...

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] Dissolve 139g of zirconium oxychloride in pure water to make a solution, adjust the pH to 2, place it in a high-pressure reactor, and heat it at 180°C for 24 hours to obtain a zirconium seed crystal precipitate, which is filtered and washed and then added to the ammonia solution;

[0055] Take 559g of zirconyl chloride, 622g of cerium ammonium nitrate, 65g of lanthanum nitrate and 58g of praseodymium nitrate into 1500mL of ultrapure water, and stir for 0.5h to obtain a clear solution, which is introduced into the above-mentioned ammonia solution containing zirconium seed crystal precipitate , adjust the pH to 10 to obtain a mixed precipitate of cerium hydroxide-zirconium hydroxide-lanthanum hydroxide-praseodymium hydroxide;

[0056] Filter and wash the above mixed precipitate for at least 3 tim...

Embodiment 2

[0062] 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:

[0063] Dissolve 182g of zirconium oxychloride in pure water to make a solution, adjust the pH to 2, place it in a high-pressure reactor, and heat it at 170°C for 24 hours to obtain a zirconium seed crystal precipitate, which is filtered and washed and added to the ammonia solution;

[0064] Take 838g of zirconyl chloride, 311g of cerium ammonium nitrate, 26g of lanthanum nitrate and 65g of neodymium nitrate into 1500mL of ultrapure water, and stir for 0.5h to obtain a clear solution, which is introduced into the above-mentioned ammonia solution containing zirconium seed crystal precipitate , adjust the pH to 10 to obtain a mixed precipitate of cerium hydroxide-zirconium hydroxide-lanthanum hydroxide-neodymium hydroxide;

[0065] Filter and wash the above precipitate for at least 3 times, then add it to...

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Abstract

The invention provides a cerium-zirconium composite oxide, comprising cerium oxide, zirconium oxide and the oxide of at least one rare earth metal element except cerium. After the cerium-zirconium composite oxide is subjected to heat treatment at 850 DEG C for 4 to 8 h, the cerium-zirconium composite oxide has pore sizes in the form of dual pore group distribution, wherein the diameters of a firstpore group are concentrated in a range of 2 to 10 nm, and the diameter of a second pore group is concentrated in a range of 15 to 80 nm. The cerium-zirconium composite oxide provided by the inventionhas remarkable 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 for the cerium-zirconium composite oxide. The preparation method can prepare the cerium-zirconium composite oxide which is more uniform in lattice doping distribution and free of phase separation, and is of great significance to study on cerium-zirconium composite oxide-containing cleaning agents for treatment of mobile-source exhaust gas.

Description

technical field [0001] The invention relates to the technical field of tail gas purification catalyst materials, in particular to a cerium-zirconium composite oxide and a preparation method thereof. Background technique [0002] Cerium-zirconium solid solution is an important part of the three-way catalyst, and its performance determines the purification effect of automobile exhaust. With the successive implementation of the National VI standard, the synthesis of cerium-zirconium composite oxide that meets the standard has become the focus of current research. [0003] Co-precipitation is one of the main methods for industrially synthesizing cerium-zirconium composite oxides. However, the cerium-zirconium composite oxide synthesized by this method has poor aging resistance and cannot meet the actual needs. Co-precipitation-hydrothermal method overcomes the shortcomings of co-precipitation technology and has become the mainstream technology for the synthesis of high-performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10
CPCB01J23/10B01J23/002B01J35/1014B01J35/1038B01J2523/00B01J2523/3706B01J2523/3712B01J2523/3718B01J2523/48B01J2523/3725B01J2523/36
Inventor 宋锡滨朱国强潘光军焦英训
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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