(19)

(11)

EP 4 824 187 A1

(12)

(43) Date of publication: 21.10.2026 Bulletin 2026/43 (21) Application number: 24828354.1 (22) Date of filing: 11.12.2024

(51) International Patent Classification (IPC):  C09K 5/10(2006.01) C23F 11/12(2006.01) C23F 11/16(2006.01) C09K 5/20(2006.01) C23F 11/14(2006.01) (52) Cooperative Patent Classification (CPC): C09K 5/10; C09K 5/20; C23F 11/149; C23F 11/165; C23F 11/10 (86) International application number: PCT/EP2024/085647 (87) International publication number: WO 2025/125309 (19.06.2025 Gazette 2025/25)

(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: 14.12.2023 US 202363610135 P (71) Applicant: Shell Internationale Research Maatschappij B.V. 2596 HR The Hague (NL)	(72) Inventors: HWANG, Garry Chih-Chau Houston, Texas 77082-3101 (US) NING, Jing Houston, Texas 77082-3101 (US) BUGOSH, Laura Houston, Texas 77082-3101 (US) (74) Representative: Shell Technology IP Department  PO Box 384 2501 CJ The Hague 2501 CJ The Hague (NL)