Source: https://patents.google.com/patent/US9039982B2/en
Timestamp: 2019-01-23 23:22:36
Document Index: 206582825

Matched Legal Cases: ['art 86', 'Application No. 2006', '§ 1', '§ 1', '§ 1', '§ 1', '§ 1', '§ 1', '§ 1']

US9039982B2 - Catalyzed SCR filter and emission treatment system - Google Patents
US9039982B2
US9039982B2 US14497454 US201414497454A US9039982B2 US 9039982 B2 US9039982 B2 US 9039982B2 US 14497454 US14497454 US 14497454 US 201414497454 A US201414497454 A US 201414497454A US 9039982 B2 US9039982 B2 US 9039982B2
flow monolith
US14497454
US20150011377A1 (en )
This application is a continuation of U.S. application Ser. No. 13/274,635, filed Oct. 17, 2011, which is a continuation of U.S. application Ser. No. 11/676,798, filed Feb. 20, 2007, which is a divisional application of U.S. application Ser. No. 10/634,659, filed Aug. 5, 2003, now U.S. Pat. No. 7,229,597, issued Jun. 12, 2007, the contents of each of which are hereby incorporated by reference in their entireties.
FIG. 5 plots the DTA signal in microvolts as a function of temperature for two catalyst compositions; (1) a reference composition, TiO2-10 wt. % WO3-2 wt. % V2O5 catalyst, and (2) the catalyst composition used to coat Catalyst A1. The TiO2-based composition is typical of the current state of art in SCR catalysts and has wide application. Powders of dried and calcined slurry of each catalyst were mixed with 6% lube oil and 14% by weight carbon black. These samples were heated at a rate of 20 C. per minute, in air, from room temperature to 800° C. The resulting DTA signal shows two peaks, one at temperatures below 400° C. corresponding to the burning of the VOF, and the second peak at higher temperatures corresponding to the combustion of carbon black. Results show that both catalyst compositions were effective in burning the lube oil portion of the simulated particulate, but the preferred catalyst composition were much more effective in burning the carbon portion as evidenced by the lowering of the soot combustion temperature. As will be seen in later examples, this advantage is maintained without compromising the NOx reduction activity.
The filtration efficiency and simultaneous NOx reduction was determined using a prototype V6, 4 L turbocharged after-cooled diesel engine that is representative of the current state of the art in diesel technology. The engine was mounted on a test stand operated at steady state to provide reproducible and stable emissions. The engine speed and load were controlled to provide a filter inlet temperature of 370° C. and a NOx concentration of about 950 ppm. Particulate measurements were determined according to the procedures described in the Code of Federal Regulations, Title 40, Part 86, paragraph 1312-88, but instead of a full dilution tunnel, a mini-dilution tunnel was used. The dilution ratio was determined from the CO2 concentration. NOx removal on the diesel engine was achieved by injecting a urea solution after the oxidation catalyst and before the SCR coated filter substrate. The experimental arrangement is illustrated in FIG. 7. NOx and ammonia were measured using a FTIR instrument equipped with a heated sampling line and analysis cell. NOx, CO and HC were also determined using a Horiba analysis bench, designed specially for the analysis of raw diesel exhaust.
1. A catalyst article consisting essentially of a wall flow monolith and a catalytic material, wherein the wall flow monolith has a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining said passages, wherein the passages comprise inlet passages having an open inlet end and a closed outlet end, and outlet passages having a closed inlet end and an open outlet end, the wall flow monolith has a porosity of from 50% to 60% and an average pore size of from 10 to 25 microns, and the wall flow monolith contains the catalytic material;
wherein the catalytic material comprises an SCR catalyst composition including a slurry-loaded washcoat of a zeolite and base metal selected from copper, the washcoat permeating the walls at a loading up to 2.4 g/in3, the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.
2. The catalyst article of claim 1, wherein the SCR catalyst composition permeates the walls of the monolith at a concentration of at least 1.3 g/in3.
4. The catalyst article of claim 1, wherein the SCR catalyst composition is effective to catalyze the reduction of NOx at a temperature below about 600° C. and is able to aid in regeneration of the wall flow monolith by lowering the temperature at which soot captured by the wall flow monolith is combusted.
5. The catalyst article of claim 1, wherein the SCR catalyst composition has a thermal resistance to degradation at temperatures greater than 650° C.
7. The catalyst article of claim 1, wherein the SCR catalyst composition promotes the oxidation of excess NH3 with 02.
14. The catalyst article of claim 1, wherein the wall flow monolith has a wall porosity of from 55% to 60% with an average pore size of from 10 to 25 microns.
15. The catalyst article of claim 1, wherein the longitudinally extending walls have an inlet side and an opposing outlet side and SCR catalyst is coated on both the inlet and outlet sides of the walls.
16. A catalyst article consisting essentially of a wall flow monolith and a catalytic material, wherein the wall flow monolith has a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining said passages, wherein the passages comprise inlet passages having an open inlet end and a closed outlet end, and outlet passages having a closed inlet end and an open outlet end, the wall flow monolith has a porosity of from 50% to 60% and an average pore size of from 10 to 25 microns, and the wall flow monolith contains the catalytic material;
wherein the catalytic material comprises an SCR catalyst composition including a slurry-loaded washcoat of a zeolite and base metal selected from a copper component, the washcoat permeating the walls at a loading up to 1.3 g/in3,
the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.
17. The catalyst article of claim 16, wherein there is from 1.6 to 2.4 g/in3 of SCR catalyst composition disposed on the wall flow monolith.
18. The catalyst article of claim 16, wherein the SCR catalyst composition contains a copper promoter present in an amount of from about 0.1 to 30 percent by weight of the total weight of promoter plus zeolite.
19. The catalyst article of claim 16, wherein the SCR catalyst composition has a thermal resistance to degradation at temperatures greater than 650° C.
20. The catalyst article of claim 19, wherein the SCR catalyst composition in effective to resist degradation upon exposure to sulfur components.
21. The catalyst article of claim 16, wherein the SCR catalyst composition promotes the oxidation of excess NH3 with 02.
22. A catalyst article consisting essentially of a wall flow monolith and a catalytic material,
wherein the wall flow monolith has a plurality of longitudinally extending passages formed by longitudinally extending walls bounding and defining said passages, wherein the passages comprise inlet passages having an open inlet end and a closed outlet end, and outlet passages having a closed inlet end and an open outlet end, the wall flow monolith has a porosity of from 50% to 55% and an average pore size of from 10 to 25 microns, and the wall flow monolith contains the catalytic material;
wherein the catalytic material comprises an SCR catalyst composition including a slurry-loaded washcoat of a zeolite and base metal selected from copper, the washcoat permeating the walls, the wall flow monolith having integrated, NOx and particulate removal efficiency in which presence of the catalytic material in the wall flow monolith catalyzes the oxidation of soot.
23. The catalyst article of claim 22, wherein the SCR catalyst composition has a thermal resistance to degradation at temperatures greater than 650° C.
24. The catalyst article of claim 23, wherein the SCR catalyst composition is effective to resist degradation upon exposure to sulfur components.
25. The catalyst article of claim 22, wherein the SCR catalyst composition promotes the oxidation of excess NH3 with O2.
26. The catalyst article of claim 22, wherein the SCR catalyst composition contains a copper promoter present in an amount of from about 0.1 to 30 percent by weight of the total weight of promoter plus zeolite.
27. The catalyst article of claim 22, wherein the wall flow monolith is effective to remove soot by deposition of particulate matter on the wall flow monolith and the catalytic material contains a component to promote combustion of the soot in the absence of a fine pore path layer on the wall of the wall flow monolith.
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US14624179 Continuation US9144795B2 (en) 2003-08-05 2015-02-17 Catalyzed SCR filter and emission treatment system
US20150011377A1 true US20150011377A1 (en) 2015-01-08
US9039982B2 true US9039982B2 (en) 2015-05-26
KR101830477B1 (en) * 2015-08-11 2018-03-30 주식회사 포스코 Apparatus for removing of nitrogen oxides in exhaust sintering gas and method for removing of nitrogen oxides
CN108698036A (en) * 2016-02-24 2018-10-23 托普索公司 Preparation of catalytic monoliths coated region
CN108698035A (en) * 2016-02-24 2018-10-23 托普索公司 The method of preparation of the catalytic monolith
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