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(11)

EP 4 739 620 A1

(12)

(43) Date of publication: 13.05.2026 Bulletin 2026/20 (21) Application number: 24733269.5 (22) Date of filing: 04.06.2024

(51) International Patent Classification (IPC):  C01B 3/38(2026.01) B01J 35/30(2024.01) B01J 23/755(2006.01) C01B 3/40(2006.01) (52) Cooperative Patent Classification (CPC): C01B 3/382; C01B 3/40; B01J 35/397; B01J 23/755; C01B 2203/0233; C01B 2203/0244; C01B 2203/025; C01B 2203/0844; C01B 2203/1058; C01B 2203/1082; C01B 2203/1094 (86) International application number: PCT/GB2024/051443 (87) International publication number: WO 2025/008604 (09.01.2025 Gazette 2025/02)

(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: 06.07.2023 GB 202310399 (71) Applicant: Johnson Matthey Davy Technologies Limited London EC2V 7AD (GB)	(72) Inventors: CARLSSON, Mikael Per Uno Billingham TS23 1LB (GB) CHRISTIE, Robert London W2 6LG (GB) DAVIES, Michael Billingham TS23 1LB (GB) DAVIS, David Jonathan Billingham TS23 1LB (GB) MCKENNA, Mark Joseph Stockton-on-Tees TS17 6PY (GB) (74) Representative: Johnson Matthey Davy Technologies Limited  5th Floor 2 Gresham Street London EC2V 7AD London EC2V 7AD (GB)