(19)

(11)

EP 1 759 096 A1

(12)

(43) Date of publication: 07.03.2007 Bulletin 2007/10 (21) Application number: 05756416.3 (22) Date of filing: 16.06.2005

(51) International Patent Classification (IPC):  F01N 3/023(2006.01) F01N 3/08(2006.01) F01N 3/035(2006.01) F01N 3/20(2006.01) (86) International application number: PCT/GB2005/002375 (87) International publication number: WO 2005/124115 (29.12.2005 Gazette 2005/52)

(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 MC NL PL PT RO SE SI SK TR (30) Priority: 18.06.2004 WO PCT/GB2004/002643 24.12.2004 GB 0428291 (71) Applicant: JOHNSON MATTHEY PUBLIC LIMITED COMPANY 40-42 Hatton Garden London EC1N 8EE (GB)	(72) Inventors: GIDNEY, Jeremy, Temple Cambridge CB4 2AQ (GB) TWIGG, Martyn Vincent Caxton, Cambridge CB3 8PQ (GB) (74) Representative: Nunn, Andrew Dominic  Johnson Matthey Technology Centre, Blount's Court, Sonning Common Reading, Berkshire RG4 9NH Reading, Berkshire RG4 9NH (GB)