Systems and methods for diesel oxidation catalyst with decreased so3 emissions
a technology of diesel oxidation catalyst and so3 emissions, which is applied in the direction of arsenic compounds, silicon compounds, separation processes, etc., can solve the problems of no/sub>2/sub>2 being unfavorable, the treatment of diesel engine exhaust, and the presence of no/sub>2 may not be favorable, so as to improve the binding effect of the washcoa
Inactive Publication Date: 2016-02-04
CLEAN DIESEL TECHNOLOGIES
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Benefits of technology
The patent text discusses the use of a material called washcoat in a catalyst system. The washcoat is made of oxides that include at least one carrier material oxide and one catalyst. Carrier material oxides that can be used include titanium dioxide, tin oxide, and zirconium dioxide. One important aspect of this invention is that it excludes the use of aluminum oxide (Al2O3) as a carrier material oxide. By doing this, the invention reduces the amount of sulfur dioxide (SO3) produced when sulfur in the exhaust gas comes into contact with the catalyst in the washcoat. This helps prevent the formation of corrosive hydrogen sulfate (H2SO4) mist. Additionally, the invention can decrease SO3 by a factor of up to 6 and inhibit the formation of corrosive droplets.
Problems solved by technology
One problem faced in the treatment of diesel engine exhaust is presented by the presence of sulfur in diesel fuel.
Additionally, sulfuric acid can cause corrosion of the downstream exhaust system leading to perforation and damage to components.
Under certain conditions, presence of NO2 may not be favorable, such as in mining or other underground conditions, because the NO2 may be toxic.
Method used
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[0040]Example #1 is an embodiment of an Exhaust Cleaning System 200. Initially, DOC 100 oxidizes CO to CO2 and HC to H2O (water) and CO2 from incoming Exhaust Gas 102, while removing a fraction of PM (up to 90%) and decreasing SO3 emissions by about 10 times or more and consequently formation of H2SO4 mist. Subsequently, Exhaust Gas 102 passes through DPF 202, which is a soot trap for removing remaining PM and soot from Exhaust Gas 102. DPF 202 may include a cordierite or silicon carbide substrate with a geometry that forces Exhaust Gas 102 to flow through the substrate walls. Other suitable materials may be employed in DPF 202, such as rare metals including palladium, silver, or platinum, for providing higher efficiency. Finally, Urea 206 may be injected before SCR 204 for thermal decomposition and hydrolysis to form ammonia, which reduces NOx into nitrogen, resulting in a Cleaned Exhaust Gas 208. Urea 206 may be commercially available as AdBlue, although other commercially availab...
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A diesel oxidation catalyst (DOC) catalytic converter for at least the conversion of carbon monoxide and hydrocarbons, removal of a fraction of particulate matter, and decrease of sulfur trioxide emissions within exhaust gases from an engine and consequently of sulfuric acid, is disclosed. The DOC may include any suitable configuration including at least a substrate and a washcoat, where the substrate has a plurality of channels, suitable porosity, offers a three-dimensional support for the washcoat, and is made of any suitable material. The washcoat may be deposited on the substrate by any suitable method, and may include a mixture of at least one or more carrier material oxides and one or more catalysts. Suitable materials for the carrier material oxides may include titanium dioxide, tin dioxide, and zirconium dioxide, among others, excluding aluminum oxide (Al2O3), which may serve for a decrease of sulfur trioxide emissions and consequently of sulfuric acid mist. Suitable catalysts within the washcoat may include platinum, palladium, rhodium, and iridium, among others.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation application of U.S. patent application Ser. No. 13 / 861,432, filed Apr. 4, 2013, entitled Systems and Methods for Diesel Oxidation Catalyst with Decreased SO3 Emissions, the entirety of which is incorporated by reference herein.BACKGROUND[0002]1. Field of the Disclosure[0003]The present disclosure relates generally to catalytic converters, and more particularly to a diesel oxidation catalyst for decreasing sulfur trioxide emissions and consequently sulfuric acid mist.[0004]2. Background Information[0005]One problem faced in the treatment of diesel engine exhaust is presented by the presence of sulfur in diesel fuel. Upon combustion, sulfur forms sulfur dioxide (SO2), which a diesel oxidation catalyst (DOC) catalyzes to sulfur trioxide (SO3) with subsequent formation of condensable acidic sulfur compounds, such as sulfuric acid, which condense upon and thereby add to the mass of particulates. Additionally,...
Claims
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IPC IPC(8): B01D53/86B01D53/94
CPCB01D53/8609B01D53/944B01D2255/20707B01D2255/915B01D2255/1023B01D2255/1028B01D2255/1025B01D2255/1021B01D2257/302B01D2258/012B01D2255/20715B01D2255/2092B01D2255/2094Y02A50/20
InventorHATFIELD, RANDAL, L.
OwnerCLEAN DIESEL TECHNOLOGIES