Reduced-emissions combustion utilizing multiple-component metallic combustion catalyst and lightly catalyzed diesel oxidation catalyst
An oxidation catalyst, diesel engine technology, applied in the direction of combustion using catalytic materials, fuel additives, special configuration of fuel supply, etc., can solve problems such as PM reduction
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0028] This example reports the testing of a 1990 International DT 466 7.6L diesel engine operated on a repeated thermal transient test cycle on an engine dynamometer. Emissions results are the average of three runs and are measured in grams per horsepower-hour. Tests on untreated No. 2 diesel fuel with >300 ppm sulfur yielded baseline particulate emissions of 0.253 g / hp-hr and NO of 1.1 g / hp-hr 2 Or 18% of the total nitrogen oxides in the exhaust. Using a bimetallic FBC at a dose rate of 0.15ppm Pt and 7.5ppm Ce in No.2D fuel, PM was reduced by 15% to 0.215 g / hp-hr while NO 2 Reduced to 12% of total nitrogen oxide emissions.
[0029] Install with 3g / ft 3 The noble metal loaded lightly catalyzed ceramic DOC, run on untreated No. 2D fuel, produced PM emissions of 0.196 g / hp-hr or a 23% reduction over the baseline. NO was not measured due to unavailability of test equipment 2 . Using FBC-treated No.2D with lightly catalyzed DOC, reduced PM emissions to 0.178 g / hp-hr, a 30%...
Embodiment 2
[0037] This example presents a single cold and three hot FTP transient test cycles for the FBC / DOC combination on a 1990 Cummins 8.3 liter 6 CTA, 275 hp medium heavy duty engine certified to meet the 1991 emission standards for NOx and PM test results. The engine was first run on untreated No. 2D fuel (>300 ppm sulfur) with no exhaust aftertreatment DOC installed. Particulate emissions were determined from the average composite at 0.190 g / hp-hr.
[0038] The fuel was switched to FBC treated commercial ULSD (2 Also from 0.9 g / hp-hr to 0.4 g / hp-hr, a reduction of over 50%.
[0039] The DOC is a 9.5" diameter x 6"L 400cpsi ceramic substrate, manufactured by Corning, Inc., and uses 0.3g / ft 3 It is catalyzed by precious metals from Clean Air Systems, Inc. of New Mexico. Mount it in a stainless steel tank with regular inlet and outlet cones. The FBC was a platinum / cerium bimetallic used at a dose rate of 0.5ppm / 7.5ppm.
[0040] The same field aged DOC-2 that had been operated i...
Embodiment 3
[0046] This Example reports experiments further demonstrating the benefit of low levels of FBC in ULSD combined with lightly catalyzed DOC. In this example, a 7.6 liter engine was tested on a 1995 Navistar DT466 in a single cold test cycle and three hot test cycles. The average of the three composite emissions results was calculated and reported in grams per horsepower-hour. Baseline emissions results on untreated No.2D fuel (>300ppm S) showed an average PM emission of 0.106 g / hp-hr and NO 2 Emissions were 1.1 g / hp-hour, representing 23% of total NOx emissions.
[0047] Using ULSD (2 down to 0.8 g / hp-hr or 19% of total NOx emissions. Reductions in HC, CO and NOx were also observed for the FBC / ULSD combination.
[0048] In another test, the lightly catalyzed DOC-1 pretreated in Example 2 was installed in the exhaust and the engine was run on the FBC treated ULSD. Total PM emissions were reduced by 45% to 0.058 g / hp-hr while NO 2 This drops to 0.6 g / hp-hr, representing 14% ...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More