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Patent US4186109A successfully refreshed from Google Patents.
US4186109A
Expired / Lapsed
US
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Catalyst for selectively reducing nitrogen oxides from oxygen-containing exhaust gases
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1977-09-27
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Granted: 1980-01-29
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Expires: 1997-09-27
Abstract
Abstract A catalyst for selective catalytic reduction of nitrogen oxides by use of ammonia as a reducing agent is prepared by mixing a silicic acid material with a lime material, heating the mixture under pressure to form a slurry of calcium silicate crystals, forming the slurry into a carrier, and then allowing the carrier to carry a catalytically active ingredient.
Inventors
- 👤 Masumi Atsukawa
- 👤 Yoshihiko Nishimoto
- 👤 Naruo Yokoyama
- 👤 Toshikuni Sera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:39
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/04; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9418; B01J23/00; B01J23/16; B01J23/20; B01J23/22; B01J23/70; B01J27/00; B01J27/02; B01J27/053; B01D2251/00; B01D2251/20; B01D2251/206; B01D2251/2062; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/20723; B01D2255/20738; B01D2255/20761; B01D2258/00; B01D2258/01; B01D2258/012; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24165
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
82 words
A catalyst for the selective catalytic reduction of nitrogen oxides using ammonia as a reducing agent, the catalyst comprising a carrier in a given physical form made from a slurry of crystallized calcium silicate prepared by mixing silicic acid and lime and heating the mixture under pressure wherein said carrier is pretreated with sulfuric acid or a sulfate to neutralize the free CaO and a catalytically active constituent selected from the group consisting of sulfates of iron, copper, vanadium or combinations thereof.
Claim 2
Dependent Claim
82 words
A catalyst for the selective catalytic reduction of nitrogen oxides using ammonia as a reducing agent, the catalyst comprising a carrier in a given physical form made from a slurry of crystallized calcium silicate prepared by mixing silicic acid and lime and heating the mixture under pressure wherein said carrier is pretreated with sulfuric acid or a sulfate to neutralize the free CaO and a catalytically active constituent selected from the group consisting of sulfates of iron, copper, vanadium or combinations thereof.
Claim 3
Dependent Claim
35 words
A catalyst according to claim 1, wherein V 2 O 5 is carried, together with at least one of additional constituents MoO 3 , Co 2 O 3 and WO 3 , by said carrier.
Claim 4
Dependent Claim
33 words
A catalyst according to claim 2, wherein said carrier is prepared by adding ZrO 2 so that said carrier in a given form contains from 5 to 50 wt% of ZrO 2 .
Claim 5
Dependent Claim
25 words
A catalyst according to claim 1, wherein TiO 2 of the anatase type and V 2 O 5 are carried as said catalytically active constituents.
Claim 6
Dependent Claim
81 words
A catalyst according to claim 1, wherein a catalytic composition consisting of either TiO 2 of the anatase type or ZrO 2 , V 2 O 5 , and one of additional consituents MoO 3 , Co 2 O 3 and WO 3 wherein the amounts of 2-5 wt.% V 2 O 5 , 1-10 wt.% MoO 3 or Co 2 O 3 or WO 3 and the balance TiO 2 or ZrO 2 are carried as said catalytically active constituents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |