Title:
CATALYST TO REMOVE NITROGEN OXIDE
Document Type and Number:
Japanese Patent JP3389005
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively use a solid type honeycomb catalyst for the removal of nitrogen oxides after used, by using a used solid type catalyst for the removal of nitrogen oxide as a lower layer and then applying a new TiO2-WO3-V2O5 ternary or TiO2-WO3 binary catalyst powder to specified thickness to form a two-layer structure.
SOLUTION: This catalyst is used for the contact reduction and removal of nitrogen oxides in exhaust gas by adding ammonia to the exhaust gas. The catalyst has a two layer structure. The lower layer of the structure consists of a used solid-type honeycomb catalyst as formed which is not useful anymore because removing performance for nitrogen oxides decreases, and as an upper layer, a new TiO2-WO3-V2O5 ternary or TiO2-WO3 binary catalyst powder is applied to 100 to 250μm thickness. The compsn. of the new catalyst powder consists of 0 to 10wt.% of V2O5, 5 to 20wt.% WO3, and the balance TiO2.
Inventors:
Yoshiaki Obayashi
Kozo Iida
Shigeru Nojima
Atsushi Morii
Osamu Naito
Kozo Iida
Shigeru Nojima
Atsushi Morii
Osamu Naito
Application Number:
JP16404396A
Publication Date:
March 24, 2003
Filing Date:
June 25, 1996
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
B01D53/86; B01D53/94; B01D53/96; B01J23/30; B01J37/02; B01J38/00; (IPC1-7): B01D53/94; B01D53/86; B01D53/96; B01J23/30
Domestic Patent References:
| JP4110038A | ||||
| JP57180433A | ||||
| JP6038037A |
Attorney, Agent or Firm:
Ryoichi Hagiwara (2 others)
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