Title:
熱的劣化触媒の再生方法
Document Type and Number:
Japanese Patent JP4264642
Kind Code:
B2
Abstract:
A catalyst that is used for a method of reduction removal of NOx in a exhaust gas by using ammonia as a reducing agent and has been deteriorated in activity by aggregation of vanadium oxide as an active component through long term use at a high temperature is washed with an acid aqueous solution having pH of 6 or less, and preferably 4 or less. The washing operation dissolves and removes away mainly the vanadium oxide as the aggregated active component, and then vanadium oxide as the active component is re-deposited thereon. The method of the invention enables regeneration of a thermally deteriorated catalyst, which has conventionally been impossible. The washing operation with the acid aqueous solution or an alkali aqueous solution does not influence the mechanical strength of the catalyst.
Inventors:
Atsushi Fukuju
Ichirai Justice
Kazuhiro Yano
Ichirai Justice
Kazuhiro Yano
Application Number:
JP2003325665A
Publication Date:
May 20, 2009
Filing Date:
September 18, 2003
Export Citation:
Assignee:
Hitachi Zosen Corporation
International Classes:
B01D53/94; B01J23/92; B01D53/86; B01D53/96; B01J38/60; B01J38/66; B01J38/68
Domestic Patent References:
| JP57180433A | ||||
| JP2000037635A | ||||
| JP61102232U | ||||
| JP54010294A | ||||
| JP56088828A |
Attorney, Agent or Firm:
Norihiko Hibi
Einosuke Kishimoto
Akira Watanabe
Kiyosue Yasuko
Einosuke Kishimoto
Akira Watanabe
Kiyosue Yasuko
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