Patent EP0661098A2 successfully refreshed from Google Patents.
EP0661098A2
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EP
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Exhaust gas purification
Assignee: NGK Insulators Ltd
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Filing: 1994-12-23
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Granted: —
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Expires: 2014-12-23
Abstract
Abstract An adsorbent-catalyst for exhaust gas purification, has a honeycomb (15) having a large number of passages divided by partition walls, substantially parallel to the flow direction of an exhaust gas to be purified. At one region (17) there is an adsorbent layer having a hydrocarbon adsorbability, supported on the honeycomb structure, and at another region (16) a catalyst layer having a three-way catalytic activity or an oxidizing ability, supported on the honeycomb structure. The adsorbent layer and the catalyst layer are separately supported on the honeycomb structure in all or part of the cross sections of the adsorbent-catalyst perpendicular to the flow direction of the exhaust gas. Alternatively there is an adsorbent layer on one region and throughpassages for exhaust gas at one or more other regions.
Inventors
- 👤 Fumio Abe
- 👤 Takashi Harada
- 👤 Masato Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 16:47
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/9481; B01J; B01J35/00; B01J35/30; B01J35/33; B01J37/00; B01J37/02; B01J37/0215; F; F01; F01N; F01N13/00; F01N13/009; F01N3/00; F01N3/08; F01N3/0807; F01N3/0814; F01N3/0828; F01N3/0835; F01N3/0871; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2892; B01J35/50; B01J35/56; B01J35/57; F01N2240/00; F01N2240/18; F01N2250/00; F01N2250/12; F01N2570/00; F01N2570/16; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
100 words
An adsorbent-catalyst for exhaust gas purification, comprising: a honeycomb structure having a large number of passages divided by partition walls, substantially parallel to the flow direction of an exhaust gas to be purified, an adsorbent layer having a hydrocarbon adsorbability, supported on the honeycomb structure, and a catalyst layer having a three-way catalytic activity or an oxidizing ability, supported on the honeycomb structure, in which adsorbent-catalyst the adsorbent layer and the catalyst layer are separately supported on the honeycomb structure in all or part of the cross sections of the adsorbent-catalyst perpendicular to the flow direction of the exhaust gas.
Claim 2
Dependent Claim
34 words
An adsorbent-catalyst according to Claim 1, wherein the cross-sectional area of the portion of the honeycomb structure on which the catalyst layer is supported, is 5-80% of the cross-sectional area of the honeycomb structure.
Claim 3
Dependent Claim
44 words
An adsorbent-catalyst according to Claim 1, wherein the heat capacity of the portion of the honeycomb structure on which the absorbent layer is supported, is larger than the heat capacity of the portion of the honeycomb structure on which the catalyst layer is supported.
Claim 4
Dependent Claim
58 words
An adsorbent-catalyst according to Claim 1, wherein the length of at least part of the portion of the honeycomb structure on which the catalyst layer is supported, in the flow direction of the exhaust gas is shorter than the length of the portion of the honeycomb structure on which the adsorbent layer is supported, in the same direction.
Claim 5
Dependent Claim
50 words
An adsorbent-catalyst according to Claim 1, wherein the open frontal area of at least part of the portion of the honeycomb structure on which the catalyst layer is supported, is larger than the open frontal area of the portion of the honeycomb structure on which the adsorbent layer is supported.
Claim 6
Dependent Claim
26 words
An adsorbent-catalyst according to any of Claims 1 to 5, wherein the adsorbent layer contains a catalyst component or has a catalyst component-containing layer supported thereon.
Claim 7
Dependent Claim
20 words
An adsorbent-catalyst according to any of Claims 1 to 6, wherein the adsorbent layer comprises zeolite as the main component.
Claim 8
Dependent Claim
17 words
An adsorbent-catalyst according to Claim 7, wherein zeolite has a Si/Al molar ratio of 40 or more.
Claim 9
Dependent Claim
24 words
An adsorbent-catalyst according to Claim 7, wherein zeolite contains at least one noble metal selected from the group consisting of Pt, Pd and Rh.
Claim 10
Dependent Claim
28 words
An adsorbent-catalyst according to Claim 7, wherein zeolite contains at least one ion selected from the ions of IB group elements (Cu, Ag and Au) of periodic table.
Claim 11
Dependent Claim
29 words
An adsorbent-catalyst according to Claim 10, wherein the content of the ion of IB group element in zeolite is 20% or more based on the Al atom in zeolite.
Claim 12
Dependent Claim
32 words
An adsorbent-catalyst according to Claim 10, wherein zeolite further.contains at least one ion selected from the ions of Mg, Ca, Sr, Ba, Y, La, Ti, Ce, Mn, Fe, Cr, Ni and Zn.
Claim 13
Dependent Claim
26 words
An adsorbent-catalyst according to any of Claims 1 to 12, wherein the catalyst layer contains at least one noble metal selected from Pt, Pd and Rh.
Claim 14
Dependent Claim
58 words
An adsorbent for exhaust gas purification, comprising: a honeycomb structure having a large number of parallel passages divided by partition walls, and an adsorbent layer having a hydrocarbon adsorbability, supported on the honeycomb structure, wherein a blowing-through portion is formed in the honeycomb structure so as to allow for the blowing of an exhaust gas through the portion.
Claim 15
Dependent Claim
20 words
An adsorbent according to Claim 14, wherein the blowing-through portion is formed parallel to the passages of the honeycomb structure.
Claim 16
Dependent Claim
24 words
An adsorbent according to Claim 14, wherein the blowing-through portion is formed at a given inclination angle to the passages of the honeycomb structure.
Claim 17
Dependent Claim
26 words
An adsorbent according to any of Claims 14 to 16, wherein the adsorbent layer contains a catalyst component or has a catalyst component-containing layer supported thereon.
Claim 18
Dependent Claim
20 words
An adsorbent according to any of Claims 14 to 17, wherein the adsorbent layer comprises zeolite as the main component.
Claim 19
Dependent Claim
17 words
An adsorbent according to Claim 18, wherein zeolite has a Si/Al molar ratio of 40 or more.
Claim 20
Dependent Claim
24 words
An adsorbent according to Claim 18, wherein zeolite contains at least one noble metal selected from the group consisting of Pt, Pd and Rh.
Claim 21
Dependent Claim
28 words
An adsorbent according to Claim 18, wherein zeolite contains at least one ion selected from the ions of IB group elements (Cu, Ag and Au) of periodic table.
Claim 22
Dependent Claim
29 words
An adsorbent according to Claim 21, wherein the content of the ion of IB group element in zeolite is 20% or more based on the Al atom in zeolite.
Claim 23
Dependent Claim
33 words
An adsorbent according to Claim 21, wherein zeolite further contains at least one ion selected from the ions of Mg, Ca, Sr, Ba, Y, La, Ti, Ce, Mn, Fe, Cr, Ni and Zn.
Claim 24
Independent Claim
57 words
A system for exhaust gas purification, provided in an exhaust pipe, which comprises: at least one adsorbent-catalyst according to any of Claims 1 to 13, and a catalyst comprising a honeycomb structure and a catalyst layer supported thereon, provided at the downstream side of the adsorbent-catalyst in the flow direction of an exhaust gas to be purified.
Claim 25
Dependent Claim
37 words
A system according to Claim 24, which further comprises: a catalyst comprising a honeycomb structure and a catalyst layer supported thereon, provided at the upstream side of the adsorbent-catalyst in the flow direction of the exhaust gas.
Claim 26
Dependent Claim
19 words
A system according to Claim 24, which further comprises: an electrical heater provided between the adsorbent-catalyst and the catalyst.
Claim 27
Dependent Claim
44 words
A system according to Claim 25, which further comprises: an electrical heater provided between the adsorbent-catalyst and the catalyst and/or at the further upstream side of the catalyst placed at the upstream side of the adsorbent-catalyst in the flow direction of the exhaust gas.
Claim 28
Independent Claim
66 words
A system according to any of Claims 24 to 27, wherein the exhaust gas to be purified is unevenly flown and thereby the flow amount of the exhaust gas in the portion of the adsorbent-catalyst on which the catalyst layer is supported, is made larger than the flow amount of the exhaust gas in the portion of the adsorbent-catalyst on which the adsorbent layer is supported.
Claim 29
Independent Claim
49 words
A system according to any of Claims 24 to 28, which further comprises: at least one adsorbent according to any of Claims 14 to 23, provided at the upstream side of the catalyst placed at the downstream side of the adsorbent-catalyst in the flow direction of the exhaust gas.
Claim 30
Independent Claim
57 words
A system for exhaust gas purification, provided in an exhaust pipe, which comprises: at least one adsorbent according to any of Claims 14 to 23, and a catalyst comprising a honeycomb structure and a catalyst layer supported thereon, provided at the downstream side of the adsorbent in the flow direction of an exhaust gas to be purified.
Claim 31
Dependent Claim
37 words
A system according to Claim 30, which further comprises: a catalyst comprising a honeycomb structure and a catalyst layer supported thereon, provided at the upstream side of the adsorbent in the flow direction of the exhaust gas.
Claim 32
Dependent Claim
19 words
A system according to Claim 30, which further comprises: an electrical heater provided between the adsorbent and the catalyst.
Claim 33
Dependent Claim
44 words
A system according to Claim 31, which further comprises: an electrical heater provided between the adsorbent and the catalyst and/or at the further upstream side of the catalyst placed at the upstream side of the adsorbent in the flow direction of the exhaust gas.
Claim 34
Independent Claim
37 words
A system according to any of Claims 30 to 33, wherein the exhaust gas to be purified is unevenly flown and thereby part of the exhaust gas stream is passed through the blowing-through portion of the adsorbent.
Claim 35
Independent Claim
136 words
A method for exhaust gas purification by the use of a system according to any of Claims 24 to 34, which comprises allowing the adsorbent layer of the adsorbent-catalyst or adsorbent of the system to adsorb the exhaust gas, particularly the hydrocarbon components, etc. generated during the cold start of an internal combustion engine; desorbing the adsorbed components from the adsorbent layer as the temperature of the adsorbent layer is increased by the exhaust gas; for some time in the above process from the adsorption to the desorption, adding an oxidizing gas to the exhaust gas or adjusting the ratio of the amounts of the air for combustion and the fuel fed, to make the exhaust gas oxygen-excessive and burn the desorbed hydrocarbons, etc, on the catalyst layer of the adsorbent-catalyst or catalyst of the system.
References Cited (Backward Citations)
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