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EP0362966A2
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Catalysts and methods for denitrization
Assignee: Sakai Chemical Industry Co Ltd
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Filing: 1989-10-04
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Granted: —
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Expires: 2009-10-04
Abstract
Abstract A denitrizing catalyst which comprises: (a) a zeolite represented by the general formula (I) H A M B [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M is an alkali metal or an alkaline earth metal, and A+nB=X wherein n is a valency of the metal M, in amounts of 80-99.9 % by weight; and (b) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, in amounts of 0.1-20 % by weight. A further denitrizing catalyst which comprises a zeolite represented by the general formula H A (M¹) B (M²) C [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M¹ is an alkali metal or an alkaline earth metal, M² is a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, A+n₁B+n₂C=X wherein n₁ and n₂ are valecies of the metals M¹ and M², respectively. Waste gases containing nitrogen oxides therein are denitrized by putting the gases into contact with the catalysts in the absence of reducing agents.
Inventors
- 👤 Masafumi C/O Sakai Chemical Yoshimoto
- 👤 Tadao C/O Sakai Chemical Nakatsuji
- 👤 Kazuhiko C/O Sakai Chemical Nagano
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 17:10
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/061; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8628
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
89 words
A denitrizing catalyst which comprises: (a) a zeolite represented by the general formula (I) H A M B [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M is an alkali metal or an alkaline earth metal, and A+nB=X wherein n is a valency of the metal M, in amounts of 80-99.9 % by weight; and (b) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, in amounts of 0.1-20 % by weight.
Claim 2
Dependent Claim
89 words
A denitrizing catalyst which comprises: (a) a zeolite represented by the general formula (I) H A M B [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M is an alkali metal or an alkaline earth metal, and A+nB=X wherein n is a valency of the metal M, in amounts of 80-99.9 % by weight; and (b) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, in amounts of 0.1-20 % by weight.
Claim 3
Dependent Claim
11 words
The catalyst as claimed in claim 1 wherein A/X>0.1 and nB/X>0.1.
Claim 4
Dependent Claim
70 words
A denitrizing catalyst which comprises a zeolite represented by the general formula H A (M¹) B (M²) C [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M¹ is an alkali metal or an alkaline earth metal, M² is a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, and A+n₁B+n₂C=X wherein n₁ and n₂ are valencies of the metals M¹ and M², respectively.
Claim 5
Dependent Claim
70 words
A denitrizing catalyst which comprises a zeolite represented by the general formula H A (M¹) B (M²) C [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M¹ is an alkali metal or an alkaline earth metal, M² is a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, and A+n₁B+n₂C=X wherein n₁ and n₂ are valencies of the metals M¹ and M², respectively.
Claim 6
Dependent Claim
12 words
The catalyst as claimed in claim 3 wherein A/X>0.1, n₁B/X>0.1 and n₂C/X>0.05.
Claim 7
Independent Claim
107 words
A method of denitrizing nitrogen oxides contained in waste gases which comprises putting the waste gases into contact with a catalyst which comprises: (a) a zeolite represented by the general formula (I) H A M B [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M is an alkali metal or an alkaline earth metal, and A+nB=X wherein n is a valency of the metal M, in amounts of 80-99.9 % by weight; and (b) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd₁ Ag, Pt, Au, Co, Cu, Cr and Ni, in amounts of 0.1-20 % by weight.
Claim 8
Independent Claim
107 words
A method of denitrizing nitrogen oxides contained in waste gases which comprises putting the waste gases into contact with a catalyst which comprises: (a) a zeolite represented by the general formula (I) H A M B [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M is an alkali metal or an alkaline earth metal, and A+nB=X wherein n is a valency of the metal M, in amounts of 80-99.9 % by weight; and (b) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd₁ Ag, Pt, Au, Co, Cu, Cr and Ni, in amounts of 0.1-20 % by weight.
Claim 9
Dependent Claim
11 words
The method as claimed in claim 5 wherein A/X>0.1 and nB/X>0.1.
Claim 10
Dependent Claim
22 words
The method as claimed in claim 5 wherein the waste gases are put into contact with the catalyst at temperatures of 300-800°C
Claim 11
Independent Claim
87 words
A method of denitrizing nitrogen oxides contained in waste gases which comprises putting the waste gases into contact with a catalyst which comprises a zeolite represented by the general formula H A (M¹) B (M²) C [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M¹ is an alkali metal or an alkaline earth metal, M² is a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, A+n₁B+n₂C=X wherein n₁ and n₂ are valencies of the metals M¹ and M², respectively.
Claim 12
Independent Claim
87 words
A method of denitrizing nitrogen oxides contained in waste gases which comprises putting the waste gases into contact with a catalyst which comprises a zeolite represented by the general formula H A (M¹) B (M²) C [(AlO₂) X ·(SiO₂) Y ]·zH₂O wherein M¹ is an alkali metal or an alkaline earth metal, M² is a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, A+n₁B+n₂C=X wherein n₁ and n₂ are valencies of the metals M¹ and M², respectively.
Claim 13
Dependent Claim
13 words
The method as claimed in claim 8 wherein A/X>0.1, n₁B/X >0.1 and n₂C/X>0.05.
Claim 14
Dependent Claim
22 words
The method as claimed in claim 8 wherein the waste gases are put into contact with the catalyst at temperatures of 300-800°C.
References Cited (Backward Citations)
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