EP0362960A2
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Use of a catalyst composition for denitrization and denitrizing catalysts
Assignee: Sakai Chemical Industry Co Ltd
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Filing: 1989-10-03
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Granted: —
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Expires: 2009-10-03
Abstract
Abstract A denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃, MoO₂, Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 5-50 % by weight as oxides; and (c) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals. Nitrogen oxides contained in waste gases are denitrized effectively by putting the gases into contact with the catalysts in the absence or presence of carbon monoxide as a reducing agent.
Inventors
- 👤 Masafumi Sakai Chemical Ind. Co. Ltd. Yoshimoto
- 👤 Tadao Sakai Chemical Ind. Co. Ltd Nakatsuji
- 👤 Kazuhiko Sakai Chemical Ind. Co. Ltd. Nagano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 01:31
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/66; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628; B01J23/56; B01J23/58; B01J23/68
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
A denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃, MoO₂, Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 5-50 % by weight as oxides; and (c) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals.
Claim 2
Dependent Claim
99 words
A denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃, MoO₂, Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 5-50 % by weight as oxides; and (c) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals.
Claim 3
Dependent Claim
104 words
The denitrizing catalyst as claimed in claim 1 which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 75-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃, MoO₂, Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 10-25 % by weight as oxides; and (c) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.1-5 % by weight as metals.
Claim 4
Dependent Claim
87 words
A denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃ and MoO₂ in amounts of 5-50 % by weight as oxides; and (c) at least one metal or oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals.
Claim 5
Dependent Claim
87 words
A denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃ and MoO₂ in amounts of 5-50 % by weight as oxides; and (c) at least one metal or oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals.
Claim 6
Dependent Claim
93 words
4 The denitrizing catalyst as claimed in claim 3 which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 75-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃ and MoO₂ in amounts of 10-25 % by weight as oxides; and (c) at least one metal or oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.1-5 % by weight as metals.
Claim 7
Dependent Claim
89 words
A denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 5-50 % by weight as oxides; and (c) at least one metal or oxide of a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals.
Claim 8
Dependent Claim
89 words
A denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 5-50 % by weight as oxides; and (c) at least one metal or oxide of a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals.
Claim 9
Dependent Claim
94 words
The denitrizing catalyst as claimed in claim 5 which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 75-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 10-25 % by weight as oxides; and (c) at least one metal or oxide of a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.1-5 % by weight as metals.
Claim 10
Independent Claim
124 words
A method of denitrizing nitrogen oxides contained in waste gases which comprises: putting the waste gases into contact with a denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃ and MoO₂ in amounts of 5-50 % by weight as oxides; and (c) at least one metal or oxide of a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals, in the presence or absence of carbon monoxide as a reducing agent at a temperature of 300-800°C.
Claim 11
Independent Claim
124 words
A method of denitrizing nitrogen oxides contained in waste gases which comprises: putting the waste gases into contact with a denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Co₃O₄, Cu₂O, Cr₂O₃, Mn₂O₃, NiO, PbO, Bi₂O₃ and MoO₂ in amounts of 5-50 % by weight as oxides; and (c) at least one metal or oxide of a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals, in the presence or absence of carbon monoxide as a reducing agent at a temperature of 300-800°C.
Claim 12
Independent Claim
125 words
A method of denitrizing nitrogen oxides contained in waste gases which comprises: putting the waste gases into contact with a denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 5-50 % by weight as oxides; and (c) at least one metal or oxide of a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals; in the presence or absence of carbon monoxide as a reducing agent at a temperature of 300-800°C.
Claim 13
Independent Claim
125 words
A method of denitrizing nitrogen oxides contained in waste gases which comprises: putting the waste gases into contact with a denitrizing catalyst which comprises: (a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90 % by weight as oxides; (b) at least one metal oxide selected from the group consisting of Al₂O₃, SiO₂, ZrO₂, Fe₂O₃, TiO₂, WO₃, MoO₃, SnO₂ and ZnO in amounts of 5-50 % by weight as oxides; and (c) at least one metal or oxide of a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10 % by weight as metals; in the presence or absence of carbon monoxide as a reducing agent at a temperature of 300-800°C.
References Cited (Backward Citations)
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