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EP0462598A2
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EP
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Transition metal-containing zeolite having high hydrothermal stability, production method thereof and method of using same
Assignee: Tosoh Corp
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Filing: 1991-06-19
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Granted: —
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Expires: 2011-06-19
Abstract
Abstract A transition metal-containing zeolite having a high hydrothermal stability having the formula, in terms of a molar composition of oxides: aA₂O·bM 2/n O·Aℓ₂O₃·cSiO₂·dH₂O (I) wherein a is 0.2 to 1.0, b is more than 0 but not more than 1.5, c is at least 10, d is an arbitrary number, A is potassium or cesium, M is a transition metal and n is a valence number of the metal M.
Inventors
- 👤 Senshi Kasahara
- 👤 Shuji Okazaki
- 👤 Kazuhiko Sekizawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 05:01
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/061; C; C01; C01B; C01B39/00; C01B39/02; C01B39/026; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A transition metal-containing zeolite having a high hydrothermal stability having the formula (I) in terms of a molar composition of oxides: aA₂O·bM 2/n O·Aℓ₂O₃·cSiO₂·dH₂O (I) wherein a is 0.2 to 1.0, b is more than 0 but not more than 1.5, c is at least 10, d is an arbitrary number, A is potassium or cesium, M is a transition metal and n is a valence number of the metal N.
Claim 2
Dependent Claim
15 words
A transition metal-containing zeolite as claimed in claim 1, wherein c is 20 to 100.
Claim 3
Dependent Claim
22 words
A transition metal-containing zeolite as claimed in claim 1, wherein a molar ratio of (A₂O+M 2/n O)/Aℓ₂O₃ is not more than 2.0.
Claim 4
Dependent Claim
20 words
A transition metal-containing zeolite as claimed in claim 1, wherein a molar ratio of Na₂O/Aℓ₂O₃ is not more than 0.01
Claim 5
Dependent Claim
31 words
A transition metal-containing zeolite as claimed in claim 1, wherein the transition metal is at least one metal selected from the group consisting of Fe, Cu, Co, Ni, Cr, and Mn.
Claim 6
Independent Claim
54 words
A method of producing a transition metal-containing zeolite having a high hydrothermal stability, comprising the steps of subjecting a zeolite having an SiO₂/Aℓ₂O₃ molar ratio of at least 10 to an ion-exchange treatment with a neutral salt of potassium or cesium and to an ion-exchange treatment with a neutral salt of a transition metal.
Claim 7
Dependent Claim
20 words
A method as claimed in claim 6, wherein the crystalline size of the zeolite is at least than 1 µm.
Claim 8
Dependent Claim
17 words
A method as claimed in claim 6, wherein the starting zeolite is subjected to an ammonia pretreatment.
Claim 9
Dependent Claim
31 words
A method as claimed in claim 6, wherein the neutral salt of potassium or cesium is at least one salt selected from the group consisting of chloride, nitrate, sulfate and acetate.
Claim 10
Dependent Claim
30 words
A method as claimed in claim 6, wherein the amount of potassium or cesium is 1 to 30 times, in terms of an ion equivalent, of Aℓ in the zeolite.
Claim 11
Dependent Claim
31 words
A method as claimed in claim 6, wherein the amount of the transition metal is not more than 20 times, in terms of an ion equivalent, of Aℓ in the zeolite.
Claim 12
Dependent Claim
21 words
A catalyst for purifying an exhaust gas, comprising the transition metal-containing meal having a high hydrothermal stability, according to claim 1.
Claim 13
Dependent Claim
25 words
A method of purifying an exhaust gas comprising bringing a combustion exhaust gas containing nitrogen oxides into contact with said catalyst according to claim 12.
References Cited (Backward Citations)
No citation records indexed.
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