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Dissertations / Theses on the topic 'Nox reduction using urea'

Author: Grafiati

Published: 4 June 2025

Last updated: 15 July 2025

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1

Akbar, Mohammed Ishthiaq. "Selective catalytic reduction of NOx gases in diesel exhaust using aqueous urea." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415042.

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2

Johar, Jasmeet Singh. "An experimental investigation of the urea-water decomposition and selective catalytic reduction (SCR) of nitric oxides with urea using V2O5-WO3-TiO2 catalyst." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2595.

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Two flow reactor studies, using an electrically heated laminar flow reactor over Vanadia based (V2O5-WO3/TiO2) honeycomb catalyst, were performed at 1 atm pressure and various temperatures. The experiments were conducted using simulated exhaust gas compositions for different exhaust gases. A quartz tube was used in order to establish inert conditions inside the reactor. The experiments utilized a Fourier transform infrared (FTIR) spectrometer in order to perform both qualitative and quantitative analysis of the reaction products. Urea-water solution decomposition was investigated over V2O5-WO3

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3

Timpanaro, Anthony. "Reduction of NOx Emissions in a Single Cylinder Diesel Engine Using SNCR with In-Cylinder Injection of Aqueous Urea." UNF Digital Commons, 2019. https://digitalcommons.unf.edu/etd/876.

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The subject of this study is the effect of in-cylinder selective non-catalytic reduction (SNCR) of NOx emissions in diesel exhaust gas by means of direct injection of aqueous urea ((NH2)2CO) into the combustion chamber. A single cylinder diesel test engine was modified to accept an electronically controlled secondary common rail injection system to deliver the aqueous urea directly into the cylinder during engine operation. Direct in-cylinder injection was chosen in order to ensure precise delivery of the reducing agent without the risk of any premature reactions taking place. Unlike direct in

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4

Hsieh, Ming-Feng. "CONTROL OF DIESEL ENGINE UREA SELECTIVE CATALYTIC REDUCTION SYSTEMS." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281463739.

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5

Snyder, Eric R. "Characterization of water injection and urea-scr systems for NOx reduction in diesel engines." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1303137622.

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6

Lentz, Samuel D. "Development and optimization of NOx reduction catalysts using statistical analysis." Connect to resource, 2009. http://hdl.handle.net/1811/36953.

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7

Santillan-Jimenez, Eduardo. "Carbon nanotube supported metal catalysts for NOx reduction using hydrocarbon reductants." Lexington, Ky. : [University of Kentucky Libraries], 2008. http://hdl.handle.net/10225/965.

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Thesis (Ph. D.)--University of Kentucky, 2008.<br>Title from document title page (viewed on January 30, 2009). Document formatted into pages; contains: xii, 202 p. : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 189-200).

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8

Mehsein, Kawsar. "Degradation mechanisms study of NOx after-treatment SCR system using urea on a Diesel Particulate Filter catalyst." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2017. http://www.theses.fr/2017ENCM0012.

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La Reduction Catalytique Sélective (SCR) par l’ammoniac est un procédé qui est commercialement utilisé pour l’élimination des oxydes d’azote (NOx) issus des moteurs Diesel afin de répondre aux exigences des normes européennes concernant les émissions. Pour pouvoir mieux traiter les NOx, surtout à froid, la combinaison du catalyseur SCR à base de zéolithe échangée au Cu (Cu-Zéolithe) et le filtre à particules (SCRF) représente un avantage à son rapprochement du moteur. Néanmoins, la combinaison peut avoir aussi des inconvénients, lors de la régénération en continue du filtre à particules, le ca

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9

Crawford, Kyle Elliott. "IMPACT OF UREA INJECTION ON NOX EMISSIONS FOR MSU CHALLENGE X HYBRID ELECTRIC VEHICLE USING A GREEN FUEL." MSSTATE, 2007. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04092007-104511/.

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The addition of Tier 2 standards by United States Environmental Protection Agency (EPA) has increased focus on light-duty vehicle emissions. In this study, a diesel-electric hybrid vehicle was used for testing under the Challenge X program. The diesel engine was powered by a 20% soy-based biodiesel - 80% diesel blend, and the electric motor received its energy from a 330 volt Nickle Metal Hydride battery pack. The diesel engine, notorious for high emissions of nitrogen oxides (NOx) and particulate matter (PM), requires aftertreatment of these emissions to achieve Tier 2 EPA compliance. The pri

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10

Jagtap, N. "Selective catalytic reduction of NOx under lean burn conditions using supported metal oxide catalysts." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2009. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2770.

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11

More, P. M. "Selective catalytic reduction of NOx by hydrocarbon using bimetallic Ag-Au supported on alumina catalyst." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2015. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2027.

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12

Hill, C. J. "Selective catalytic reduction of NOx over Ag/Al2O3 using higher hydrocarbons and the effect of hydrogen." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.484959.

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The purpose of this study was to first of all determine which hydrocarbon gave the Ã‚Â• best ac.tivity for the H2HC-SCR reaction, then how the addition of H2affected th.e Ag structure on the catalyst as well as how it was involved in the reaction mechanism. In this stUdy interesting and unique experimental. techniques were used these included in situ E?<AFS and fast transient kinetics using isotopically labeled 15NO. Results showed that octane gave the best activity for the HC-SCR both with and without the addition of H2. From EXAFS results the addition of H2 had no effect on the Ag structure,

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13

Tomita, Atsuko, Mitsuru Sano, Takashi Hibino, Takeshi Yoshii, and Masahiro Nagao. "Electrochemical Reduction of NOx at Intermediate Temperatures Using a Proton-Conducting In^3+ -Doped SnP2O7 Electrolyte." The Electrochemical Society, 2006. http://hdl.handle.net/2237/18459.

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14

PENA, DONOVAN ALEXANDER. "DEVELOPMENT AND CHARACTERIZATION OF MIXED OXIDE CATALYSTS FOR THE SELECTIVE CATALYTIC REDUCTION OF NITRIC OXIDE FROM STATIONARY SOURCES USING AMMONIA." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054307250.

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15

Ong, Chun Yang. "Adaptive PI control of NOx̳ emissions in a Urea Selective Catalytic Reduction System using system identification models." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/50561.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.<br>In title on title page, double underscored "x" appears as subscript and italic.<br>Includes bibliographical references (leaf 125).<br>The Urea SCR System has shown great potential for implementation on diesel vehicles wanting to meet the upcoming emission regulations by the EPA. The objective of this thesis is to develop an adaptive controller that is capable of uniformly maintaining a high efficiency and a low ammonia slip in the presence of various uncertainties in the underlying mechanisms as wel

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16

Keinz, Jan. "Optimization of a Dry Low NOx Micromix Combustor for an Industrial Gas Turbine Using Hydrogen-Rich Syngas Fuel." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/277234.

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Environmentally friendly and efficiently produced energy from sustainable and renewable resources is of great importance. Carbon dioxide (CO2) and nitric oxides (NOx) are the main emissions of air-breathing gas turbines in power plants. Gas turbines of the power generation industry are normally fueled with liquid fuels, natural gas or syngas in changing qualities. Syngas can be produced by gasification processes in IGCC power plants and consist of varying percentages of the main fractions hydrogen (H2) and carbon monoxide (CO). CO2 emissions can be reduced by a decrease of the CO-share and an

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17

Santillan-Jimenez, Eduardo. "CARBON NANOTUBE SUPPORTED METAL CATALYSTS FOR NO_x REDUCTION USING HYDROCARBON REDUCTANTS." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_diss/672.

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Nitrogen oxides (NOx) are atmospheric pollutants that pose a serious threat to both the environment and human health. Although catalytic deNOx technologies for engines working under stoichiometric air-to-fuel ratios (i.e., most gasoline engines) are already available, their performance is unsatisfactory under excess air conditions like those under which diesel engines operate. The selective catalytic reduction of NOx with hydrocarbon reductants (HC-SCR) is a potential deNOxsolution for diesel engines, whose operating temperatures are 150-500 ºC. Given that is unlikely for a single catalyst to

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18

Gupta, Himanshu. "NOx reduction by Carbonaceous Materials and CO₂ separation using regenerative metal oxides from fossil fuel based flue gas /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486399160107212.

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19

Babaie, Meisam. "Reduction of diesel engine exhaust emissions using non-thermal plasma technology." Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/81593/1/Meisam_Babaie_Thesis.pdf.

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Non-thermal plasma (NTP) is a promising candidate for controlling engine exhaust emissions. Plasma is known as the fourth state of matter, where both electrons and positive ions co-exist. Both gaseous and particle emissions of diesel exhaust undergo chemical changes when they are exposed to plasma. In this project diesel particulate matter (DPM) mitigation from the actual diesel exhaust by using NTP technology has been studied. The effect of plasma, not only on PM mass but also on PM size distribution, physico-chemical structure of PM and PM removal mechanisms, has been investigated. It was fo

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20

Dani, Debasis. "Reduction of NOx in diesel engine using diesel water emulsion." Thesis, 2012. http://ethesis.nitrkl.ac.in/3401/1/combo_thesis.pdf.

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Diesel engines exhausting gaseous emission and particulate matter have long been regarded as one of the major air pollution sources, particularly in metropolitan areas, and have been a source of serious public concern for a long time. There has been numerous research in the field of reduction of these pollutants since diesel engines came to major use. Major emissions from a diesel engine are NOx, SOx, CO and particulate matter (PM).amongst these pollutants CO and Sox and some quantity of particulate matters are reduced by some after treatment methods, outside the engine, in the catalytic conve

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21

Panda, Sunil Kumar. "Reduction of NOx emission in diesel engine using Exhaust Gas Recirculation." Thesis, 2012. http://ethesis.nitrkl.ac.in/3698/1/final_thesis_-_Sunil_Panda.pdf.

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Nowadays, internal combustion engines are the essential parts of transportation and mechanized agricultural system. So the consumption of diesel and petroleum has been upsurged. As petroleum is a nonrenewable source and recent surge in petroleum prices have regenerated interest in bio-fuels. It has shown that biodiesel-fueled engines produce less CO, unburned HC and smoke emissions compared to diesel fuel, but higher NOx emissions. Exhaust Gas Recirculation (EGR) is an efficient technique to reduce NOx emission as it lowers the flame temperature in the combustion chamber. The objective of this

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22

賴理夏. "Low Temperature Selective Catalytic Reduction of NOx with NH3 using La(1-x)Sr(x)Mn(1-y)Co(y)O3 Perovskite Catalysts." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/69995045982399131618.

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碩士<br>國立交通大學<br>環境工程系所<br>102<br>The selective catalytic reduction (SCR) has been applied for several decades to reduce NOx emissions with ammonia from stationary sources. The MoO3 or V2O5 supported on TiO2 are the most commonly employed SCR catalysts. However, it is limited to a narrow and relatively higher temperature window (300~400℃). This limits the application of SCR to many other industrial processes such as the steel manufacture industry which has high NOx emissions at relatively lower temperatures of around 150℃. Perovskite-type oxides, with the characteristics of low-cost materials a

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23

Klingbeil, Adam Edgar. "Particulate and NOx reduction in a heavy-duty diesel engine using high levels of exhaust gas recirculation and very early or very late start of injection." 2002. http://catalog.hathitrust.org/api/volumes/oclc/50137860.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2002.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 117-121).

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24

(7830965), Houston L. Miller. "INVESTIGATION OF CORN YIELD IMPROVEMENT FOLLOWING CEREAL RYE USING STARTER NITROGEN FERTILIZER." Thesis, 2019.

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Cereal rye (CR), the most common and effective nitrogen (N) scavenging cover crop option in the Midwest, is often utilized in cropping systems to reduce nitrate loss for environmental benefits. To increase environmental efficiency in Midwest corn cropping systems, we must increase the overall adoption of CR. However, due to the yield reduction potential (6%) for corn planted after CR termination, CR is primarily recommended before soybean. To increase CR adoption, we must develop adaptive fertilizer management practices that achieve competitive grain yields relative to cropping systems where C

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