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Mixed oxides based on cerium and zirconium

A technology of mixed oxides and oxides, applied in the direction of zirconium compounds, chemical/physical processes, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of undisclosed total pore volume, etc.

Pending Publication Date: 2022-03-04
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] US 2019 / 168188 discloses mixed oxides of zirconium, cerium, lanthanum and optionally at least one rare earth metal other than cerium and lanthanum, but does not disclose total pore volume, d50 and d90

Method used

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  • Mixed oxides based on cerium and zirconium
  • Mixed oxides based on cerium and zirconium
  • Mixed oxides based on cerium and zirconium

Examples

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Comparison scheme
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example

[0141] The following examples are given to illustrate the invention. The elemental proportions of the mixed oxides are given by weight of the oxides.

[0142] Particle size distribution

[0143] The particle size distribution was determined with a laser particle size analyzer (Beckman-Coulter model LS13320). Follow the manufacturer's guidelines for using the Fraunhofer model. The particle size distribution (by volume) is obtained from a dispersion of particles in water in the presence of a dispersant (sodium hexametaphosphate). A relative index of refraction of 1.6 was used. From the distribution by volume, values ​​for d10, d50, d90 and d99 were obtained. In the table below, they are given in μm.

[0144] Specific surface area (BET)

[0145] Specific surface area through N 2 Adsorption was determined automatically on a Quantachrome NOVA 4000e. Samples were degassed to desorb volatiles and clean surfaces prior to any measurement.

[0146] Porosity

[0147] Poro...

example 1

[0156] Example 1: Preparation of mixed oxide Zr-Ce-La 60%-35%-5%

[0157] First, with 47L of H 2 O and 16L CeCl 3 aqueous solution (1.53mol / L and density 1.33) to prepare co-chloride solution (CZR solution), to which 20.2kg of ZrOCl was added 2 Aqueous solution (36.2wt% ZrO 2 ; loss on ignition LOI 63.6%). H will then be added 2 SO 4 Aqueous solution (8.77 wt% and density 1.05).

[0158] The CZR solution was transferred to a precipitation tank pre-filled with 110 L of NaOH aqueous solution (10.8% wt and density 1.099) within 50 min. During the precipitation, the stirring speed was fixed at 220 rpm. Wash pulp by filtration / repulping to remove all SO 4 2- 、Na + and Cl - Ions (less than 200ppm for each ion). After reslurry at 80 g / L in water, the slurry was aged at 125°C for 1 hour. After aging, the introduction of La(NO 3 ) 3 , in order to obtain the desired amount of lanthanum oxide (5%wt of La 2 o 3 ). Then 4 kg of lauric acid were added to the dispersion w...

example 4

[0165] ●Example 4: Zr-Ce-La-Y 60%-24%-3.5%-12.5%

[0166] ●Example 5: Zr-Ce-La-Y 60%-30%-5%-5%

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Abstract

A mixed oxide, a catalytic composition, a catalytic wall flow monolith, use of the mixed oxide and a process for preparing the mixed oxide. The mixed oxide comprises zirconium, cerium, lanthanum, and optionally at least one rare earth element other than cerium and lanthanum. The catalytic composition and the wall flow monolith comprise particles of the mixed oxide. The mixed oxide is used in the preparation of a coating on a filter. The method of making the mixed oxide includes jet milling. The mixed oxide, when in the form of an aqueous slurry, is a compromise between calibrated size and low viscosity while maintaining high specific surface area and high pore volume.

Description

[0001] This application claims priority from International Patent Application PCT / CN 2019 / 096864 filed on July 19, 2019, the contents of which are fully incorporated by reference into this application for all purposes. If there is any inconsistency between this application and this PCT application affecting the clarity of terminology or expression, only this application should be referred to. [0002] The invention relates to mixed oxides based on cerium, zirconium, lanthanum and optionally at least one rare earth element other than cerium and lanthanum, which behave between viscosity, porosity and heat resistance at high temperatures of aqueous slurries compromise. The invention also relates to a catalytic composition comprising particles of said mixed oxide and to the use of said composition for producing a coating on a filter. Background technique [0003] Gasoline engines produce a combustion exhaust stream containing hydrocarbons, carbon monoxide and nitrogen oxides, and...

Claims

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Application Information

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IPC IPC(8): C01G25/00B01J21/06B01J23/10B01J35/10B01J37/00
CPCB01J23/10B01D2258/014B01D2258/012B01D2255/9207B01D2255/9202B01D2255/9155B01D2255/407B01D2255/2092B01D2255/20715B01D2255/2065B01D2255/102B01D53/944B01J21/066B01J37/031C01G25/006C01P2006/14C01P2004/51C01P2004/61C01G25/00C01P2006/12C01P2002/54Y02T10/12B01J35/56B01J35/638B01J35/40B01J35/613B01D53/945B01D2255/2061B01D2255/2063B01J37/0018B01J37/0027B01J37/04B01J37/088C01P2002/52C01P2006/22B01J35/50B01J35/635
Inventor S·伊弗拉R·乔治科埃略马奎斯李伟朱凌
Owner RHODIA OPERATIONS SAS