Reducing oxides of nitrogen using reformate generated from engine fuel, water and/or air

a technology of engine fuel and reformate, which is applied in the direction of machines/engines, mechanical equipment, separation processes, etc., can solve the problems of complex and expensive nox reduction techniques, no catalyst formulations which are able to adequately provide urea, and no infrastructure in place to provide urea solutions, etc., to achieve simple, low-cost hydrogen generation, and improve the reduction of nox to nitrogen
US20030226350A1Inactive Publication Date: 2003-12-11SHELL OIL CO
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
SHELL OIL CO
Publication Date
2003-12-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

Inlet air (15) humidified in an air bubbling (or other) humidifier (35) that receives water from a tank (36) is sent to a hydrogen generator (27) along with vaporized (23) diesel fuel (22) to produce hydrogen and carbon monoxide (28) for either (a) mixing with the mainstream of exhaust (18) fed to a catalytic converter (30) or (b) regenerating a pair of NOx adsorption traps (38, 39), thereby reducing oxides of nitrogen (NOx), to provide system exhaust (32) which may have less than 0.40 grams / bhp / hr of NOx and 0.28 grams / bhp / hr of non-methane hydrocarbons. In other embodiments, unhumidified air mixed with fuel feeds a homogeneous non-catalytic partial oxidizer (27) to provide the required hydrogen and carbon monoxide.
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Description

[0001] This is a continuation-in-part of U.S. patent application Ser. No. 10 / 166,860 filed on Jun. 11, 2002.

[0002] This invention relates to reducing oxides of nitrogen (NOx) in the exhaust of hydrocarbon-fueled, internal combustion engines (such as gasoline or diesel engines), and more particularly to using hydrogen generators, such as catalytic partial oxidizers (CPOx), non-catalytic (homogeneous) partial oxidizers (POx), or auto thermal reformers (ATR), to generate from engine fuel, water and / or air, streams including hydrogen and carbon monoxide for reducing NOx in catalytic converters or regenerating NOx trap adsorbents.

[0003] The Environmental Protection Agency (EPA) has set, for 2007 and beyond, vehicle internal combustion engine emission requirements; one exemplary requirement for diesel engines, is NOx and non-methane hydrocarbons below 0.20 grams bhp-hr and 0.14 grams / bhp-hr, respectively. This contrasts with current standards of 4.0 grams / bhp-hr and 1.3 grams / bhp-hr, resp...

Claims

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