(19)

(11)

EP 3 807 220 A1

(12)

(43) Date of publication: 21.04.2021 Bulletin 2021/16 (21) Application number: 19733858.5 (22) Date of filing: 12.06.2019

(51) International Patent Classification (IPC):  C01G 23/047(2006.01) B01J 23/38(2006.01) B01J 37/00(2006.01) C01G 23/08(2006.01) C01B 13/02(2006.01) B01J 21/06(2006.01) B01J 35/00(2006.01) C01G 23/053(2006.01) C01B 3/04(2006.01) (86) International application number: PCT/GB2019/051625 (87) International publication number: WO 2019/239129 (19.12.2019 Gazette 2019/51)

(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 MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 12.06.2018 GB 201809634 (71) Applicant: Oxford University Innovation Limited Oxford, OX2 0JB (GB)	(72) Inventor: TSANG, Shik Chi Oxford OX1 3TA (GB) (74) Representative: HGF  1 City Walk Leeds LS11 9DX Leeds LS11 9DX (GB)