The Effect of NO2/NOx Ratio on the Performance of a SCR Downstream of a SCR Catalyst on a DPF
Different aftertreatment systems consisting of a combination of selective catalytic reduction (SCR) and SCR catalyst on a diesel particulate filter (DPF) (SCR-F) are being developed to meet future oxides of nitrogen (NOx) emissions standards being set by the Environmental Protection Agency (EPA) and...
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| Veröffentlicht in: | SAE International journal of fuels and lubricants 2019-01, Vol.12 (2), p.121-142 |
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| creator | Chundru, Venkata Rajesh Parker, Gordon G. Johnson, John H. |
| description | Different aftertreatment systems consisting of a combination of selective catalytic reduction (SCR) and SCR catalyst on a diesel particulate filter (DPF) (SCR-F) are being developed to meet future oxides of nitrogen (NOx) emissions standards being set by the Environmental Protection Agency (EPA) and the California Air Resources Board (CARB). One such system consisting of a SCRF® with a downstream SCR was used in this research to determine the system NOx reduction performance using experimental data from a 2013 Cummins 6.7L ISB (Interact System B) diesel engine and model data. The contribution of the three SCR reactions on NOx reduction performance in the SCR-F and the SCR was determined based on the modeling work. The performance of a SCR was simulated with a one-dimensional (1D) SCR model. A NO2/NOx ratio of 0.5 was found to be optimum for maximizing the NOx reduction and minimizing NH3 slip for the SCR for a given value of ammonia-to-NOx ratio (ANR). The SCRF® + SCR system was simulated using the 2D SCR-F + 1D SCR system model. For all the test conditions, the NO2/NOx ratio downstream of the SCRF® was found to be 0 due to NO2 consumption by the NO2 assisted particulate matter (PM) oxidation and the SCR reactions in the SCRF®. Due to this low NO2/NOx ratio, the NOx conversion performance of the downstream SCR was limited to a maximum of 70% and the system performance to a maximum of 97%. The low SCR performance is due to low fast SCR ( |
| doi_str_mv | 10.4271/04-12-02-0008 |
| format | Article |
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One such system consisting of a SCRF® with a downstream SCR was used in this research to determine the system NOx reduction performance using experimental data from a 2013 Cummins 6.7L ISB (Interact System B) diesel engine and model data. The contribution of the three SCR reactions on NOx reduction performance in the SCR-F and the SCR was determined based on the modeling work. The performance of a SCR was simulated with a one-dimensional (1D) SCR model. A NO2/NOx ratio of 0.5 was found to be optimum for maximizing the NOx reduction and minimizing NH3 slip for the SCR for a given value of ammonia-to-NOx ratio (ANR). The SCRF® + SCR system was simulated using the 2D SCR-F + 1D SCR system model. For all the test conditions, the NO2/NOx ratio downstream of the SCRF® was found to be 0 due to NO2 consumption by the NO2 assisted particulate matter (PM) oxidation and the SCR reactions in the SCRF®. Due to this low NO2/NOx ratio, the NOx conversion performance of the downstream SCR was limited to a maximum of 70% and the system performance to a maximum of 97%. The low SCR performance is due to low fast SCR (<10%) and high standard SCR reaction (<85%) rates in the downstream SCR. Also, high NH3 slip due to lower utilization by the SCR reactions was observed from the SCR. Improved NO2/NOx ratio at the SCRF® inlet results in NO2 slip at the SCRF® outlet, which then leads to better NOx reduction performance of this system.</description><identifier>ISSN: 1946-3952</identifier><identifier>EISSN: 1946-3960</identifier><identifier>DOI: 10.4271/04-12-02-0008</identifier><language>eng</language><publisher>Warrendale: SAE International</publisher><subject>Aftertreatment modeling ; Ammonia ; Catalyst ; Catalysts ; Chemical reduction ; Diesel ; Diesel engines ; Diesel particulate filter model ; Downstream effects ; Emission standards ; Environmental protection ; Fluid filters ; Nitrogen dioxide ; Nitrogen oxides ; NOx reduction ; Optimization ; Oxidation ; Particulate emissions ; Particulate matter ; Particulate matter oxidation ; Selective catalytic reduction ; Selective reduction catalyst on a DPF model ; Slip ; System modeling ; Two dimensional models</subject><ispartof>SAE International journal of fuels and lubricants, 2019-01, Vol.12 (2), p.121-142</ispartof><rights>Copyright © 2019 SAE International</rights><rights>Copyright SAE International, a Pennsylvania Not-for Profit 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/26891401$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/26891401$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,776,780,799,27901,27902,57992,58225</link.rule.ids></links><search><creatorcontrib>Chundru, Venkata Rajesh</creatorcontrib><creatorcontrib>Parker, Gordon G.</creatorcontrib><creatorcontrib>Johnson, John H.</creatorcontrib><title>The Effect of NO2/NOx Ratio on the Performance of a SCR Downstream of a SCR Catalyst on a DPF</title><title>SAE International journal of fuels and lubricants</title><description>Different aftertreatment systems consisting of a combination of selective catalytic reduction (SCR) and SCR catalyst on a diesel particulate filter (DPF) (SCR-F) are being developed to meet future oxides of nitrogen (NOx) emissions standards being set by the Environmental Protection Agency (EPA) and the California Air Resources Board (CARB). One such system consisting of a SCRF® with a downstream SCR was used in this research to determine the system NOx reduction performance using experimental data from a 2013 Cummins 6.7L ISB (Interact System B) diesel engine and model data. The contribution of the three SCR reactions on NOx reduction performance in the SCR-F and the SCR was determined based on the modeling work. The performance of a SCR was simulated with a one-dimensional (1D) SCR model. A NO2/NOx ratio of 0.5 was found to be optimum for maximizing the NOx reduction and minimizing NH3 slip for the SCR for a given value of ammonia-to-NOx ratio (ANR). The SCRF® + SCR system was simulated using the 2D SCR-F + 1D SCR system model. For all the test conditions, the NO2/NOx ratio downstream of the SCRF® was found to be 0 due to NO2 consumption by the NO2 assisted particulate matter (PM) oxidation and the SCR reactions in the SCRF®. Due to this low NO2/NOx ratio, the NOx conversion performance of the downstream SCR was limited to a maximum of 70% and the system performance to a maximum of 97%. The low SCR performance is due to low fast SCR (<10%) and high standard SCR reaction (<85%) rates in the downstream SCR. Also, high NH3 slip due to lower utilization by the SCR reactions was observed from the SCR. Improved NO2/NOx ratio at the SCRF® inlet results in NO2 slip at the SCRF® outlet, which then leads to better NOx reduction performance of this system.</description><subject>Aftertreatment modeling</subject><subject>Ammonia</subject><subject>Catalyst</subject><subject>Catalysts</subject><subject>Chemical reduction</subject><subject>Diesel</subject><subject>Diesel engines</subject><subject>Diesel particulate filter model</subject><subject>Downstream effects</subject><subject>Emission standards</subject><subject>Environmental protection</subject><subject>Fluid filters</subject><subject>Nitrogen dioxide</subject><subject>Nitrogen oxides</subject><subject>NOx reduction</subject><subject>Optimization</subject><subject>Oxidation</subject><subject>Particulate emissions</subject><subject>Particulate matter</subject><subject>Particulate matter oxidation</subject><subject>Selective catalytic reduction</subject><subject>Selective reduction catalyst on a DPF model</subject><subject>Slip</subject><subject>System modeling</subject><subject>Two dimensional models</subject><issn>1946-3952</issn><issn>1946-3960</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpFkE1LAzEQhoMoWKtHj0LA87aTbDYfR-mHCqUttR5lye4m2tJuapKi_femVBRemGHmeWeYQeiWQI9RQfrAMkIzSAKQZ6hDFONZrjic_-UFvURXIawBuICcdNDb8sPgkbWmjthZPJ3R_nT2jRc6rhx2LY6pPTfeOr_VbW2OjMYvgwUeuq82RG_09r820FFvDiEejRoP5-NrdGH1Jpib39hFr-PRcvCUTWaPz4OHSfZOZR4z2XCQlaVNIxUFy2rFGwNCWUEqwljVEFFbq6CqFTBa80JS01RNwXluqVYi76L709ydd597E2K5dnvfppUlLRgUgnAhE9U7UUGbctVGk4h0ZsL-aGAloSUkpRcmw93JsA7R-XLnV1vtDyXlUhEGJP8B7eRrBg</recordid><startdate>20190101</startdate><enddate>20190101</enddate><creator>Chundru, Venkata Rajesh</creator><creator>Parker, Gordon G.</creator><creator>Johnson, John H.</creator><general>SAE International</general><general>SAE International, a Pennsylvania Not-for Profit</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PATMY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>PYCSY</scope></search><sort><creationdate>20190101</creationdate><title>The Effect of NO2/NOx Ratio on the Performance of a SCR Downstream of a SCR Catalyst on a DPF</title><author>Chundru, Venkata Rajesh ; Parker, Gordon G. ; Johnson, John H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-g283t-8d608bf2dd8920f4c96de079f71b144bd17cff90bc9042c6582edbd5663f2a973</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Aftertreatment modeling</topic><topic>Ammonia</topic><topic>Catalyst</topic><topic>Catalysts</topic><topic>Chemical reduction</topic><topic>Diesel</topic><topic>Diesel engines</topic><topic>Diesel particulate filter model</topic><topic>Downstream effects</topic><topic>Emission standards</topic><topic>Environmental protection</topic><topic>Fluid filters</topic><topic>Nitrogen dioxide</topic><topic>Nitrogen oxides</topic><topic>NOx reduction</topic><topic>Optimization</topic><topic>Oxidation</topic><topic>Particulate emissions</topic><topic>Particulate matter</topic><topic>Particulate matter oxidation</topic><topic>Selective catalytic reduction</topic><topic>Selective reduction catalyst on a DPF model</topic><topic>Slip</topic><topic>System modeling</topic><topic>Two dimensional models</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chundru, Venkata Rajesh</creatorcontrib><creatorcontrib>Parker, Gordon G.</creatorcontrib><creatorcontrib>Johnson, John H.</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>Agricultural & Environmental Science Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ProQuest Central Student</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Environmental Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>Environmental Science Collection</collection><jtitle>SAE International journal of fuels and lubricants</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chundru, Venkata Rajesh</au><au>Parker, Gordon G.</au><au>Johnson, John H.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Effect of NO2/NOx Ratio on the Performance of a SCR Downstream of a SCR Catalyst on a DPF</atitle><jtitle>SAE International journal of fuels and lubricants</jtitle><date>2019-01-01</date><risdate>2019</risdate><volume>12</volume><issue>2</issue><spage>121</spage><epage>142</epage><pages>121-142</pages><issn>1946-3952</issn><eissn>1946-3960</eissn><abstract>Different aftertreatment systems consisting of a combination of selective catalytic reduction (SCR) and SCR catalyst on a diesel particulate filter (DPF) (SCR-F) are being developed to meet future oxides of nitrogen (NOx) emissions standards being set by the Environmental Protection Agency (EPA) and the California Air Resources Board (CARB). One such system consisting of a SCRF® with a downstream SCR was used in this research to determine the system NOx reduction performance using experimental data from a 2013 Cummins 6.7L ISB (Interact System B) diesel engine and model data. The contribution of the three SCR reactions on NOx reduction performance in the SCR-F and the SCR was determined based on the modeling work. The performance of a SCR was simulated with a one-dimensional (1D) SCR model. A NO2/NOx ratio of 0.5 was found to be optimum for maximizing the NOx reduction and minimizing NH3 slip for the SCR for a given value of ammonia-to-NOx ratio (ANR). The SCRF® + SCR system was simulated using the 2D SCR-F + 1D SCR system model. For all the test conditions, the NO2/NOx ratio downstream of the SCRF® was found to be 0 due to NO2 consumption by the NO2 assisted particulate matter (PM) oxidation and the SCR reactions in the SCRF®. Due to this low NO2/NOx ratio, the NOx conversion performance of the downstream SCR was limited to a maximum of 70% and the system performance to a maximum of 97%. The low SCR performance is due to low fast SCR (<10%) and high standard SCR reaction (<85%) rates in the downstream SCR. Also, high NH3 slip due to lower utilization by the SCR reactions was observed from the SCR. Improved NO2/NOx ratio at the SCRF® inlet results in NO2 slip at the SCRF® outlet, which then leads to better NOx reduction performance of this system.</abstract><cop>Warrendale</cop><pub>SAE International</pub><doi>10.4271/04-12-02-0008</doi><tpages>22</tpages></addata></record> |
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| identifier | ISSN: 1946-3952 |
| ispartof | SAE International journal of fuels and lubricants, 2019-01, Vol.12 (2), p.121-142 |
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| source | Jstor Complete Legacy |
| subjects | Aftertreatment modeling Ammonia Catalyst Catalysts Chemical reduction Diesel Diesel engines Diesel particulate filter model Downstream effects Emission standards Environmental protection Fluid filters Nitrogen dioxide Nitrogen oxides NOx reduction Optimization Oxidation Particulate emissions Particulate matter Particulate matter oxidation Selective catalytic reduction Selective reduction catalyst on a DPF model Slip System modeling Two dimensional models |
| title | The Effect of NO2/NOx Ratio on the Performance of a SCR Downstream of a SCR Catalyst on a DPF |
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