Title:
METHOD OF REGENERATING THERMALLY DETERIORATED CATALYST
Document Type and Number:
WIPO Patent Application WO/2005/028102
Kind Code:
A1
Abstract:
A catalyst which is for use in the reductional removal of NOx contained in a waste gas with ammonia as a reducing agent and which, through long-term use at high temperatures, has undergone agglomeration of a vanadium oxide as an active ingredient and a decrease in activity is washed with an aqueous acid solution having a pH of 6 or lower, preferably 4 or lower. This washing mainly dissolves away the vanadium oxide agglomerated, which is an active ingredient. This vanadium oxide as an active ingredient is then deposited again. This method enables a thermally deteriorated catalyst to be regenerated, although this regeneration has been impossible. The washing with the aqueous acid solution or with an aqueous alkali solution exerts no influence on the mechanical strength of the catalyst.
Inventors:
FUKUJU ATSUSHI (JP)
ICHIKI MASAYOSHI (JP)
YANO KAZUHIRO (JP)
ICHIKI MASAYOSHI (JP)
YANO KAZUHIRO (JP)
Application Number:
PCT/JP2004/014131
Publication Date:
March 31, 2005
Filing Date:
September 21, 2004
Export Citation:
Assignee:
HITACHI SHIPBUILDING ENG CO (JP)
FUKUJU ATSUSHI (JP)
ICHIKI MASAYOSHI (JP)
YANO KAZUHIRO (JP)
FUKUJU ATSUSHI (JP)
ICHIKI MASAYOSHI (JP)
YANO KAZUHIRO (JP)
International Classes:
B01D53/86; B01D53/96; B01J23/92; B01J38/60; B01J38/66; B01D53/94; B01J38/68; (IPC1-7): B01J23/92; B01D53/94; B01J38/60; B01J38/66; B01J38/68
Foreign References:
| JPS57180433A | 1982-11-06 | |||
| JP2000037635A | 2000-02-08 | |||
| JPS61102232A | 1986-05-20 | |||
| JPS5410294A | 1979-01-25 | |||
| JPS5688828A | 1981-07-18 |
Attorney, Agent or Firm:
Hibi, Norihiko c/o KISHIMOTO & CO. (3rd Floor Inaba Building, 13-18,
Nishishinsaibashi 1-chome, Chuo-ku, Osaka-sh, Osaka 86, JP)
Download PDF: