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EP 4 816 677 A1

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(43) Date of publication: 07.10.2026 Bulletin 2026/41 (21) Application number: 24813224.3 (22) Date of filing: 18.11.2024

(51) International Patent Classification (IPC):  F01N 3/035(2006.01) F01N 13/00(2010.01) B01D 53/94(2006.01) F01N 3/022(2006.01) F01N 3/20(2006.01) B01D 46/00(2022.01) C04B 35/00(2006.01) F01N 3/10(2006.01) (52) Cooperative Patent Classification (CPC): F01N 3/2066; F01N 3/035; F01N 2610/02; F01N 13/0093; F01N 13/009; B01D 53/9418; F01N 3/0222; F01N 2510/065; F01N 2370/02; F01N 2330/06; F01N 2370/04; F01N 3/106; F01N 2340/00; F01N 2330/60; B01D 53/9477; B01D 2255/20723; B01D 2255/2098; B01D 2255/9155; Y02A 50/20; Y02T 10/12 (86) International application number: PCT/GB2024/052917 (87) International publication number: WO 2025/114689 (05.06.2025 Gazette 2025/23)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA Designated Validation States: GE KH MA MD TN (30) Priority: 28.11.2023 US 202363603159 P (71) Applicant: Johnson Matthey Public Limited Company Royston SG8 5HE (GB)

(72) Inventors: BERGEAL, David Royston, Hertfordshire SG8 5HE (GB) CHANDLER, Guy Richard Royston, Hertfordshire SG8 5HE (GB) CHIFFEY, Andrew Francis Royston, Hertfordshire SG8 5HE (GB) GOERSMANN, Claus Friedrich Royston, Hertfordshire SG8 5HE (GB) HATCHER, Daniel Stuart Royston, Hertfordshire SG8 5HE (GB) NEWMAN, Andrew David Royston, Hertfordshire SG8 5HE (GB) PHILLIPS, Paul Richard Royston, Hertfordshire SG8 5HE (GB) (74) Representative: Johnson Matthey Public Limited Company  Blounts Court Road, Sonning Common Intellectual Property Department Reading RG4 9NH Reading RG4 9NH (GB)