Title:
METHOD FOR RECOVERING NOBLE METAL FROM CATALYST DEVICE HAVING METAL CARRIER
Document Type and Number:
WIPO Patent Application WO/2005/087375
Kind Code:
A1
Abstract:
A method for recovering a wash coat carrying a noble metal component from a catalyst device having a metal carrier, which comprises treating the catalyst device having a metal carrier provided with a wash coat and, carried thereon, a catalyst component containing a noble metal with an aqueous mixed acid solution containing sulfuric acid and nitric acid. The method can be employed for separating and recovering a wash coat carrying a catalyst component containing a noble metal from the metal carrier of a used catalyst device having a metal carrier for use in the clarification of an exhaust gas from an internal combustion engine, without substantially crashing or dissolving said metal carrier with good efficiency.
Inventors:
NAKATSU SHIGERU (JP)
YOKOTA TOMONAO (JP)
YOKOTA TOMONAO (JP)
Application Number:
PCT/JP2004/003384
Publication Date:
September 22, 2005
Filing Date:
March 15, 2004
Export Citation:
Assignee:
ISHIFUKU METAL IND (JP)
NAKATSU SHIGERU (JP)
YOKOTA TOMONAO (JP)
NAKATSU SHIGERU (JP)
YOKOTA TOMONAO (JP)
International Classes:
B01J38/00; C22B3/06; C22B3/08; C22B3/46; B01J23/46; B01J37/02; B01J38/60; (IPC1-7): B01J38/00
Foreign References:
| JPH0834619A | 1996-02-06 |
Other References:
NAKAHARA S. ET AL.: "Muki Kagobutsu Sakutai Jiten.", KODANSHA LTD., 10 June 1997 (1997-06-10), pages 381, XP002992416
Attorney, Agent or Firm:
Odajima, Heikichi (Nippon Jitensha Bldg. 9-15, Akasaka 1-chom, Minato-ku Tokyo, JP)
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