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EP 1 077 767 A1

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(43) Date of publication: 28.02.2001 Bulletin 2001/09 (21) Application number: 99921880.3 (22) Date of filing: 13.05.1999

(51) International Patent Classification (IPC)7: B01J 21/18, B01J 23/745, C02F 1/28, C02F 1/72 (86) International application number: PCT/US9910/320 (87) International publication number: WO 9958/239 (18.11.1999 Gazette 1999/46)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 14.05.1998 US 85416 P (71) Applicant: U.S. Environmental Protection Agency Washington, D.C. 20004 (US)	(72) Inventors: HULING, Scott, G. Ada, OK 79820 (US) ARNOLD, Robert, G. Tucson, AZ 85718 (US) SIERKA, Raymond, A. Tucson, AZ 85750 (US) (74) Representative: Becker Kurig Straus  PatentanwälteBavariastrasse 7 80336 München 80336 München (DE)