Utilizing intake-air oxygen-enrichment technology to reduce cold- phase emissions

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Oxygen-enriched combustion is a proven, serious considered technique to reduce exhaust hydrocarbons (HC) and carbon monoxide (CO) emissions from automotive gasoline engines. This paper presents the cold-phase emissions reduction results of using oxygen-enriched intake air containing about 23% and 25% oxygen (by volume) in a vehicle powered by a spark-ignition (SI) engine. Both engineout and converter-out emissions data were collected by following the standard federal test procedure (FTP). Converter-out emissions data were also obtained employing the US Environmental Protection Agency`s (EPA`s) ``Off-Cycle`` test. Test results indicate that the engine-out CO emissions during the cold phase (bag 1) were reduced by ... continued below

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16 p.

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Poola, R.B.; Ng, H.K.; Sekar, R.R.; Baudino, J.H. & Colucci, C.P. December 31, 1995.

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Oxygen-enriched combustion is a proven, serious considered technique to reduce exhaust hydrocarbons (HC) and carbon monoxide (CO) emissions from automotive gasoline engines. This paper presents the cold-phase emissions reduction results of using oxygen-enriched intake air containing about 23% and 25% oxygen (by volume) in a vehicle powered by a spark-ignition (SI) engine. Both engineout and converter-out emissions data were collected by following the standard federal test procedure (FTP). Converter-out emissions data were also obtained employing the US Environmental Protection Agency`s (EPA`s) ``Off-Cycle`` test. Test results indicate that the engine-out CO emissions during the cold phase (bag 1) were reduced by about 46 and 50%, and HC by about 33 and 43%, using nominal 23 and 25% oxygen-enriched air compared to ambient air (21% oxygen by volume), respectively. However, the corresponding oxides of nitrogen (NO{sub x}) emissions were increased by about 56 and 79%, respectively. Time-resolved emissions data indicate that both HC and CO emissions were reduced considerably during the initial 127 s of the cold-phase FTP, without any increase in NO, emissions in the first 25 s. Hydrocarbon speciation results indicate that all major toxic pollutants, including ozone-forming specific reactivity factors, such as maximum incremental reactivity (NUR) and maximum ozone incremental reactivity (MOIR), were reduced considerably with oxygen-enrichment. Based on these results, it seems that using oxygen-enriched intake air during the cold-phase FTP could potentially reduce HC and CO emissions sufficiently to meet future emissions standards. Off-cycle, converter-out, weighted-average emissions results show that both HC and CO emissions were reduced by about 60 to 75% with 23 or 25% oxygen-enrichment, but the accompanying NO{sub x}, emissions were much higher than those with the ambient air.

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16 p.

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OSTI as DE96004811

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  • Canadian Dam Safety Association conference, Banff (Canada), Oct 1995

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  • Other: DE96004811
  • Report No.: ANL/ES/CP--87623
  • Report No.: CONF-9510283--1
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 197806
  • Archival Resource Key: ark:/67531/metadc667507

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 16, 2015, 6:50 p.m.

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Poola, R.B.; Ng, H.K.; Sekar, R.R.; Baudino, J.H. & Colucci, C.P. Utilizing intake-air oxygen-enrichment technology to reduce cold- phase emissions, article, December 31, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc667507/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.