# US 10,369,547 B2 · Composition based on oxides of cerium, of zirconium and of another rare earth metal with high reducibility, preparation process and use in the field of catalysis

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- Number: US 10,369,547 B2
- Document ID: US10369547B2
- Status: Granted
- Kind: B2
- Application number: 14/125,639
- Filed: 2012-06-13
- Published: 2014-07-24
- Granted: 2019-08-06
- Earliest claimed: 2011-06-17
- Assignees: Rhodia Operations
- Applicants: Simon Ifrah; Emmanuel Rohart; Julien Hernandez; Dominique Horbez; Lama Itani
- Inventors: Simon Ifrah; Emmanuel Rohart; Julien Hernandez; Dominique Horbez; Lama Itani
- Web page: https://patentgrep.com/patent/US10369547B2

## CPC

- B01J 23/10: of rare earths
- B01D 53/945: {characterised by a specific catalyst}
- B01J 23/34: Manganese
- B01J 23/83: with rare earths or actinides
- B01J 35/613: {10-100 m2/g}
- B01J 37/0018: {Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)}
- B01J 37/031: {Precipitation}
- B01J 37/06: Washing {(B01J37/0009, B01J37/0018 take precedence)}
- B01J 37/343: {of ultrasonic wave energy}
- C01G 25/006: {Compounds containing zirconium, with or without oxygen or hydrogen, and containing two or more other elements}
- B01D 53/944: {Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445)}
- B01D 2255/206: Rare earth metals
- B01D 2255/2065: Cerium
- B01D 2255/20715: Zirconium
- B01D 2255/9207: Specific surface
- B01J 35/40: characterised by dimensions, e.g. grain size (in a colloidal state B01J35/23; crystallite size B01J35/77)
- C01P 2002/50: Solid solutions
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/13: thermal stability thereof at high temperatures
- Y02T 10/12: Improving ICE efficiencies
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The composition of the invention is based on oxides of cerium, of zirconium and of at least one rare earth metal other than cerium, with a cerium oxide content of greater than 50% by weight and it has, after calcination at 1000° C. for 4 hours, a specific surface area of at least 20 m2/g and an amount of mobile oxygen between 200° C. and 400° C. of at least 0.8 ml O2/g. It is prepared by a process in which, in a reactor, a mixture of compounds of cerium, of zirconium and of the other rare earth metal is reacted continuously with a basic compound with a residence time of the reaction medium in the mixing zone of the reactor of at most 100 milliseconds; the precipitate is heated then brought into contact with a surfactant before being calcined.

## Claims

### Claim 1

A composition based on oxides of cerium, zirconium and at least one rare-earth metal other than cerium, with a cerium oxide content of greater than 50% by mass, wherein the composition has, after calcination at 1000° C. for 4 hours:
a specific surface area of at least 20 m2/g;
an amount of mobile oxygen between 200° C. and 400° C. of at least 0.8 ml O2/g; and
a maximum reducibility temperature of not more than 520° C.

### Claim 2 (depends on 1)

The composition as claimed in claim 1, wherein the composition has an amount of mobile oxygen between 200° C. and 400° C. of at least 1 ml O2/g.

### Claim 3 (depends on 1)

The composition as claimed in claim 1, wherein the composition has an amount of mobile oxygen between 200° C. and 450° C. of at least 1 ml O2/g.

### Claim 4 (depends on 1)

The composition as claimed in claim 1, wherein the composition has, after calcination at 1000° C. for 4 hours, a specific surface area of at least 25 m2/g.

### Claim 5 (depends on 1)

The composition as claimed in claim 1, wherein the composition has a cerium oxide content between 50% and 90%.

### Claim 6 (depends on 1)

The composition as claimed in claim 1, wherein the composition has a content of oxide of the rare-earth metal other than cerium of not more than 30%.

### Claim 7 (depends on 6)

The composition as claimed in claim 6, wherein the composition has a content of oxide of the rare-earth metal other than cerium of between 5% and 20%.

### Claim 8 (depends on 1)

The composition as claimed in claim 1, wherein the rare-earth metal other than cerium is selected from yttrium, lanthanum, praseodymium, gadolinium and neodymium.

### Claim 9 (depends on 1)

The composition as claimed in claim 1, further comprising one or more additional elements selected from iron, cobalt, strontium, copper and manganese.

### Claim 10 (depends on 1)

The composition as claimed in claim 1, wherein the composition has a maximum reducibility temperature of not more than 520° C. after calcination at 1000° C. for 4 hours.

### Claim 11 (depends on 1)

The composition as claimed in claim 1, wherein the composition is deaggregatable by an ultrasonication treatment and wherein, after the ultrasonication treatment, the composition is in the form of particles with a mean diameter (d50) of not more than 10 μm.

### Claim 12 (depends on 1)

A catalytic system, comprising a composition as claimed in claim 1.