# US 11,439,952 B2 · Low temperature nitrogen oxide adsorber > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,439,952 B2 - Document ID: US11439952B2 - Status: Granted - Kind: B2 - Application number: 17/282,850 - Filed: 2019-11-08 - Published: 2021-11-11 - Granted: 2022-09-13 - Earliest claimed: 2018-11-16 - Assignees: Umicore AG & Co. KG - Applicants: Umicore AG & Co. KG - Inventors: Elena Mueller; Kris Driesen - Web page: https://patentgrep.com/patent/US11439952B2 ## CPC - B01D 53/9422: {for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)} - B01D 53/9418: {for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas} - B01D 53/944: {Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445)} - B01D 53/9468: {in different layers} - B01D 53/9477: {with catalysts positioned on separate bricks, e.g. exhaust systems} - B01J 23/14: of germanium, tin or lead - B01J 23/44: Palladium - B01J 37/0215: {Coating} - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 3/2803: {characterised by structure, by material or by manufacturing of catalyst support} - B01D 2255/1021: Platinum - B01D 2255/1023: Palladium - B01D 2255/2063: Lanthanum - B01D 2255/2065: Cerium - B01D 2255/20738: Iron - B01D 2255/20746: Cobalt - B01D 2255/20761: Copper - B01D 2255/2092: Aluminium - B01D 2255/2094: Tin - B01D 2255/50: Zeolites - B01D 2255/9022: Two layers - B01D 2255/904: Multiple catalysts - B01D 2255/91: NOx-storage component incorporated in the catalyst - B01D 2257/404: Nitrogen oxides other than dinitrogen oxide - B01D 2258/012: Diesel engines and lean burn gasoline engines - F01N 2370/04: Zeolitic material - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - Y02T 10/12: Improving ICE efficiencies - 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) - B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract The present invention relates to a composite metal oxide which comprises 80 to 97 wt %, in relation to the weight of the composite metal oxide, of one or more oxides of cerium and 3 to 20 wt %, in relation to the composite metal oxide of a metal oxide comprising tin oxide (SnO2) and lanthanum oxide (La2O3) and/or aluminum oxide (Al2O3), a composite material for the storage of nitrogen oxides which comprises such composite metal oxide and palladium, as well as an exhaust gas system containing said composite material. ## Claims ### Claim 1 Composite metal oxide which comprises: 80 to 97 wt %, in relation to the weight of the composite metal oxide, of one or more oxides of cerium; and 3 to 20 wt %, in relation to the weight of the composite metal oxide, of a metal oxide comprising: (i) tin oxide (SnO2), and (ii) one or both of lanthanum oxide (La2O3) and aluminum oxide (Al2O3). ### Claim 2 (depends on 1) Composite metal oxide according to claim 1 which comprises: 84 to 96 wt %, in relation to the weight of the composite metal oxide, of the one or more oxides of cerium; and 4 to 16 wt %, in relation to the weight of the composite metal oxide, of the metal oxide comprising (i) and (ii). ### Claim 3 (depends on 1) Composite metal oxide according to claim 1, wherein the metal oxide consists of tin oxide (SnO2) and lanthanum oxide (La2O3). ### Claim 4 (depends on 3) Composite metal oxide according to claim 3, wherein the weight ratio of tin oxide (SnO2) and lanthanum oxide (La2O3) is 4:1 to 1:1.5. ### Claim 5 (depends on 4) Composite material for the storage of nitrogen oxides comprising a composite metal oxide according to claim 4 and palladium. ### Claim 6 (depends on 5) Composite material according to claim 5, wherein the palladium is present in quantities of 0.01 to 20 wt % in relation to the weight of the composite material and calculated as palladium metal. ### Claim 7 (depends on 5) Composite material according to claim 5, wherein the composite material is present in form of a coating on a carrier substrate of the length L. ### Claim 8 (depends on 7) Composite material according to claim 7, wherein the carrier substrate comprises a further coating which is oxidation-catalytically active. ### Claim 9 (depends on 8) Composite material according to claim 8, wherein the oxidation-catalytically-active coating comprises platinum or palladium, or platinum and palladium on a carrier material. ### Claim 10 (depends on 5) Exhaust gas system comprising a) a composite material according to claim 5 and b) an SCR catalyst. ### Claim 11 (depends on 10) Exhaust gas system according to claim 10, wherein the SCR catalyst is a zeolite which belongs to the framework type, BEA, AEI, AFX, CHA, KFI, ERI, LEV, MER, or DDR, and which is exchanged with cobalt, iron, copper, or mixtures of two or three of these metals. ### Claim 12 (depends on 10) Method for cleaning exhaust gases from motor vehicles that are operated with lean-burn engines, wherein the exhaust gas is channeled through an exhaust gas system according to claim 10. ### Claim 13 (depends on 2) Composite metal oxide according to claim 2 which comprises 90 to 96 wt % of the one or more oxides of cerium. ### Claim 14 (depends on 13) Composite metal oxide according to claim 13 which comprises 4 to 10 wt % of the metal oxide comprising (i) and (ii). ### Claim 15 (depends on 2) Composite metal oxide according to claim 2 which comprises 4 to 10 wt % of the metal oxide comprising (i) and (ii). ### Claim 16 (depends on 1) Exhaust gas system comprising a) a carrier substrate of length L with a coating comprising the composite metal oxide according to claim 1, and b) an SCR catalyst. ### Claim 17 (depends on 16) Exhaust gas system according to claim 16, wherein the carrier substrate is a flow-through substrate. ### Claim 18 (depends on 5) Exhaust gas system comprising a) a carrier substrate of length L with a coating comprising the composite material according to claim 5, and b) an SCR catalyst. ### Claim 19 (depends on 18) Exhaust gas system according to claim 18, wherein the carrier substrate is a flow-through substrate. ### Claim 20 (depends on 19) Exhaust gas system according to claim 19, wherein the carrier substrate comprises a further coating which is oxidation-catalytically active, wherein the oxidation-catalytically-active coating comprises platinum or palladium, or platinum and palladium.