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(11)

EP 2 021 520 A1

(12)

(43) Date of publication: 11.02.2009 Bulletin 2009/07 (21) Application number: 07733702.0 (22) Date of filing: 22.05.2007

(51) International Patent Classification (IPC):  C22B 11/00(2006.01) B22F 9/16(2006.01) C07F 1/12(2006.01) C22B 15/00(2006.01) B22F 9/24(2006.01) C07F 1/00(2006.01) (86) International application number: PCT/GB2007/050281 (87) International publication number: WO 2007/138345 (06.12.2007 Gazette 2007/49)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR Designated Extension States: AL BA HR MK RS (30) Priority: 26.05.2006 GB 0610409 (71) Applicant: Johnson Matthey Public Limited Company London EC1N 8EE (GB)	(72) Inventors: BISHOP, Peter Trenton Reading Berkshire RG4 9LS (GB) BOARDMAN, Alan Reading Berkshire RG4 8PY (GB) (74) Representative: Whitcombe, Nicole Jane  Johnson Matthey Technology Centre Blount's Court Sonning Common Reading RG4 9NH Sonning Common Reading RG4 9NH (GB)