A kind of cerium zirconium composite oxide and preparation method thereof

A composite oxide and cerium-zirconium technology, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problems of inapplicability to industrial production and high cost, and achieve good results Effects of low-temperature catalytic activity, large pore volume, and high oxygen storage capacity

Active Publication Date: 2022-07-05
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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  • A kind of cerium zirconium composite oxide and preparation method thereof
  • A kind of cerium zirconium composite oxide and preparation method thereof
  • A kind of cerium zirconium composite oxide and preparation method thereof

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preparation example Construction

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

[0047] S1, preparation of seed crystals: zirconium oxychloride is dissolved in pure water to prepare a solution, and the pH value is adjusted to 1.2-2.0. The zirconium oxychloride solution was added to the autoclave, heated at 150°C to 180°C for 24 hours to obtain a white precipitate, which was filtered and washed for later use;

[0048] S2, liquid preparation: dissolve the 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 aqueous ammonia solution, and 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: the mixed precipitate obtained in step S3 is introduced into the autoclav...

Embodiment 1

[0053] Embodiment 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 139 g of zirconium oxychloride in pure water to make a solution, adjust the pH to 2, place it in an autoclave, heat and react at 180 °C for 24 h to obtain a zirconium seed crystal precipitate, which is filtered and washed and added to the aqueous ammonia solution;

[0055] 559g of zirconium oxychloride, 622g of ceric ammonium nitrate, 65g of lanthanum nitrate and 58g of praseodymium nitrate were added to 1500mL of ultrapure water, and stirred for 0.5h to obtain a clear solution, which was 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] The mixed precipitate was filtered and washed for at le...

Embodiment 2

[0062] Embodiment 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 an autoclave, heat and react at 170°C for 24h to obtain a zirconium seed crystal precipitate, which is filtered and washed and added to the aqueous ammonia solution;

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

[0065] The above precipitate was filtered and washed for at least 3 ...

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Abstract

The present invention provides a cerium-zirconium composite oxide, comprising cerium oxide, zirconium oxide and at least one oxide of rare earth metal elements other than cerium. The pore size of the double pore group distribution, wherein the diameter of the first pore group is concentrated in 2-10 nm, and the diameter of the second pore group is concentrated in 15-80 nm. The cerium-zirconium composite oxide provided by the invention has remarkable low-temperature catalytic activity, and can be used to catalyze hydrocarbons, carbon oxides and / or nitrogen oxides in the exhaust gas of the mobile source. The invention also provides a preparation method of cerium-zirconium composite oxide, which can prepare and obtain cerium-zirconium composite oxide with more uniform element lattice doping distribution and no phase separation, and can treat and purify mobile source exhaust gas containing cerium-zirconium composite oxide The study of the drug is of great significance.

Description

technical field [0001] The invention relates to the technical field of catalyst materials for exhaust gas purification, 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 oxides that meet the standards has become the focus of current research. [0003] Co-precipitation is one of the main methods for industrial synthesis of cerium-zirconium composite oxides. However, the cerium-zirconium composite oxide synthesized by this method has poor anti-aging ability and cannot meet the actual demand. Co-precipitation-hydrothermal method overcomes the shortcomings of co-precipitation technology and becomes the mainstream technology for synthesizing high-perfor...

Claims

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Application Information

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Patent Type & Authority Patents(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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