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Dissertations / Theses on the topic 'Diesel Catalyst'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Yap, Yeow Hong. "Characterisation of a diesel oxidation catalyst." Thesis, University of Bath, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.551174.

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In order to obtain a deeper understanding of the performance of a diesel oxidation catalyst (DOC), techniques are developed which help to bridge the gap in the development of catalyst technology from the laboratory bench-top to an application on a real 2.0 litre diesel engine. The methodology is illustrated using a full-scale DOC (106 mm diameter; length 114 mm), from which sections are cut and then examined using a variety of techniques, including: optical measurement, SEM, TEM, FTIR, CO chemisorption, pore size and pore volume measurements. These provide valuable information on the character

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2

Genc, Volkan Eyup. "Diesel Soot Oxidation Catalyst Filter System Design." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606189/index.pdf.

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The objective of this study was onboard testing of a mixed metal oxide diesel soot oxidation catalyst composing of oxides of lead and cobalt previously developed in our lab, by mounting a diesel particulate filter (DPF), which is coated with this catalyst, to the exhaust stream of a diesel vehicle. Commercial wall flow type DPF&rsquo<br>s (Corning EX-80) were coated with the catalyst by a slurry wash-coating procedure and then mounted on the exhaust stream of a diesel light duty vehicle (LDV) provided by TOFAS (FIAT Doblo 1.9 JTD). These vehicles were driven on the rollers of the chassis dynam

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3

Ye, Shifei. "Oxidation catalyst studies on a diesel engine." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533408.

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In this thesis, the experimental test facilities consisted of a well instrumented live Ford 2.0 litre turbocharged diesel engine connected to a specially made exhaust can, which contained a diesel oxidation catalyst (DOC). Experiments were performed on DOCs, which were specially prepared by Johnson Matthey, and had thermocouples mounted in their walls to measure axial temperature profiles. These DOCs consisted of a Pt catalyst dispersed in an alumina washcoat on a cordierite monolith supports, and were representative of a commercial application. Experiments were performed on Full-scale DOCs (o

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4

Erwe, Karolin. "Selective Diesel Oxidation Catalysts for Hydrocarbons." Thesis, KTH, Skolan för kemivetenskap (CHE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-145857.

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5

Kienkas, Liene. "Effect of Biofuel Impurities on the Diesel Oxidation Catalyst." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-212558.

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Scania provides sustainable transport systems powered by bioethanol, biogas, biodiesel along with hybrid and conventional solutions. Today Scania offers the largest variety of engines operating on alternative fuels in the market. The number of the alternative fuel operated vehicles sold in 2016 increased by 40 % [1]. Nevertheless, one of the alternative fuels – biodiesel - is a source of inorganic contaminants. These impurities can detrimentally affect the diesel truck after-treatment system that is responsible for harmful emission abatement. As a consequence, better understanding of the alter

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6

Midlam-Mohler, Shawn. "Modeling, control, and diagnosis of a diesel lean nox traps catalyst." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1117570314.

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7

Kröger, V. (Virpi). "Poisoning of automotive exhaust gas catalyst components:the role of phosphorus in the poisoning phenomena." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514286087.

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Abstract The aim of this thesis project was to gain new knowledge on the effect of phosphorus on the catalytic activity and characteristics of automotive exhaust gas catalyst components. The simultaneous roles of phosphorus and calcium were also studied. The first test series of powdery catalyst samples contained Rh and oxide (Test series 1) and the second, Pt and oxide or ZSM-5 (Test series 2). The catalysts were analyzed when fresh and after two ageing and phosphorus poisoning procedures developed in this work. The procedures consisted of adding poison via impregnation in an aqueous solutio

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8

Yamashita, Hiroshi, Hiroyoshi Yane, Masamichi Nakamura, and Kazuhiro Yamamoto. "Simulation on catalytic reaction in diesel particulate filter." Elsevier, 2010. http://hdl.handle.net/2237/20048.

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9

Nylén, Ulf. "Development of ring-opening catalysts for diesel quality improvement." Licentiate thesis, KTH, Chemical Engineering and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1712.

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<p>The global oil refining industry with its present shift inproduct distribution towards fuels such as gasoline and dieselwill most likely hold the fort for many years to come. However,times will change and survival will very much depend onprocessing flexibility and being at the frontiers of refiningtechnology, a technology where catalysts play leading roles.Today oil refiners are faced with the challenge to producefuels that meet increasingly tight environmentalspecifications, in particular with respect to maximum sulphurcontent. At the same time, the quality of crude oil is becomingworse wi

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10

Yamauchi, Kazuki, and Kazuhiro Yamamoto. "Numerical simulation of continuously regenerating diesel particulate filter." Elsevier, 2013. http://hdl.handle.net/2237/20043.

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11

Lemoine, Gaetan. "Comparison of different types of Zeolites used as Solid Acid Catalysts in the Transesterification reaction of Jatropha-type oil for Biodiesel production." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-theses/268.

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Sustainable energy management has become a high priority for many countries. A great majority of our energy stocks comes from non-renewable fossil fuels, which are currently dwindling. Biofuels are one of the most promising solutions being researched to address this urgent problem. In particular, using transesterified Jatropha curcas L. oil appears to be a promising method of producing biofuels due to several properties of the plant, such as the high oil yield of its seeds and the fact that it does not compete with food crops. The literature mentions many attempts of using zeolites as so

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12

Rico, Pérez Verónica. "Optimization of N2O decomposition RhOx/ceria catalysts and design of a high N2-selective deNOx system for diesel vehicles." Doctoral thesis, Universidad de Alicante, 2013. http://hdl.handle.net/10045/35739.

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13

Karatzas, Xanthias. "Rhodium diesel-reforming catalysts for fuel cell applications." Doctoral thesis, KTH, Kemisk teknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32647.

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Heavy-duty diesel truck engines are routinely idled at standstill to provide cab heating or air conditioning, and in addition to supply electricity to comfort units such as radio and TV. Idling is an inefficient and unfavorable process resulting in increased fuel consumption, increased emissions, shortened engine life, impaired driver rest and health, and elevated noise. Hydrogen-fueled, polymer-electrolyte fuel-cell auxiliary power unit (PEFC-APU) as a silent external power supply, working independently of the main engine, is proposed as viable solution for better fuel economy and abatement o

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14

Nylén, Ulf. "Ring-opening catalysts for cetane improvement of diesel fuels." Doctoral thesis, KTH, Kemiteknik, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-537.

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The global oil refining industry with its present product distribution essentially shifted towards fuels such as gasoline and diesel will most likely hold the fort for considerable time. However, conditions are changing and refinery survival will very much depend on long-term planning, process and product flexibility and being at the frontiers of refining technology, a technology where catalysts play leading roles. Today oil refiners are faced with the challenge of producing fuels that meet increasingly tight environmental specifications, in particular with respect to maximum sulphur content.

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15

Peyrovi, Parnian. "Improved resistance to deactivation of coupled NH3-SCR/ DPF catalyst for diesel exhaust emissions control." Thesis, Lille, 2018. http://www.theses.fr/2018LIL1R041.

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Les moteurs Diesels connaissent un intérêt récent tout particulier car ils rejettent moins de CO2 que les moteurs essences à puissance égale, du fait qu’ils travaillent en mélange pauvre (en excès d’oxygène). Récemment, des catalyseurs de réduction catalytique sélective (SCR) déposés sur des filtres à particules diesel (FAP) ont été développés pour les applications automobiles en raison de leur capacité à réduire simultanément les émissions de NOx et de particules. Une telle mise en œuvre nécessite une résistance thermique améliorée du catalyseur SCR du fait des exothermes liés à la régénérati

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16

Mora, Pérez Javier. "Control-oriented modelling and diagnostics of diesel after-treatment catalysts." Doctoral thesis, Universitat Politècnica de València, 2019. http://hdl.handle.net/10251/115937.

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[ES] Esta tesis doctoral abarca el desarrollo de algoritmos orientados a mejorar el sistema de control de emisiones en motores Diesel. Para este propósito, la inclusión en el vehículo de sensores embarcados como los de temperatura, los de NOx o el de NH3 permite realizar diagnóstico a bordo de los sistemas de post-tratamiento foco de este trabajo, los cuales son el DOC y el SCR. Así pues, el objetivo es el de satisfacer las normativas de diagnóstico a bordo para mantener las emisiones por debajo del umbral permitido por la normativa a lo largo del tiempo. Los tests experimentales, incluyendo

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17

Gardezi, Syed Ali Z. H. "Effect of Catalyst Preparation Conditions on the Performance of Eggshell Cobalt/SiO₂ Catalysts for Fischer-Tropsch Synthesis." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1639.

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A highly selective eggshell Fischer-Tropsch catalyst has been fabricated via interaction of hydrophobic and hydrophilic molecules on thermally treated silica gel. The physical interactions of the mesoporous silica support and the effect of catalyst preparation conditions on the performance of the cobalt/SiO2 were explored. It was found that dispersion and performance of the FT cobalt/SiO2 catalyst were significantly affected by the preparation technique used. In this study we focus on two key variables: the solvent used during the precursor loading and the calcination atmosphere. Silanol group

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18

Dale, James G. "Implications of the Use of Cerium Oxide Nanoparticle Diesel Fuel-Borne Catalysts: From Transformation During Combustion Through Exposure to Plants and Soils." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77538.

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The fate of nanoparticulate cerium oxide from the diesel fuel catalyst Envirox was studied from its presence in the additive to its transformations during combustion through its exposure to plants and soils using a broad range of analytical techniques. Envirox is a fuel-borne catalyst comprised of nanoparticles of cerium oxide suspended in kerosene. The particles suspended in Envirox were confirmed by synchrotron X-ray diffraction, dynamic light scattering, and electron microscopy to be 5-7 nm crystals of CeO2 present as 15 nm aggregates. Significant changes to the particles were induced by

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19

Shah, Zeban. "Preparing jet engine and diesel engine range fuels from biomass pyrolysis oil through hydrogenation using NiMo as a catalyst." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/171707.

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Neste trabalho, o uso de bio-óleo foi proposto como alternativa aos combustíveis fósseis (petróleo). O bio-óleo foi produzido por pirólise de serragem de eucalipto e óleo de fritura de soja descartado, enquanto que o óxido de cálcio (CaO) foi usado como catalisador de pirólise para melhorar o rendimento de bio-óleo. A temperatura do sistema de pirólise foi iniciada a 25 °C e aumentada para 850 °C. A destilação atmosférica de bio-óleo bruto foi realizada após a pirólise e duas frações foram separadas à temperatura de 80−160 ºC (LFP, Fação Leve da Pirólise do bio- óleo) e 160−240 ºC (HFP, Fração

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20

Kärkkäinen, M. L. (Marja-Liisa). "Deactivation of oxidation catalysts by sulphur and phosphorus in diesel and gas driven vehicles." Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526217239.

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Abstract The combustion of fuels in motor vehicles is one of the most significant causes of air emissions. The use of oxidation catalysts in exhaust gas emission treatment can reduce hydrocarbons (HCs) and carbon monoxide (CO) emissions by more than 90%. Fuels and engine lubricants contain impurities like sulphur (S) and phosphorus (P), which can have a significant effect on the activity and durability of oxidation catalysts. This thesis aims at increasing the current knowledge of the deactivation phenomena caused by sulphur and phosphorus in diesel and natural/bio gas oxidation catalysts. Acc

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21

Wang, Wentao. "NH3 exhaust gas fuel reforming tor diesel engine decarbonisation & lean NOx abatement over Silver/Alumina catalyst." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/5436/.

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The thesis is focusing on the potential roles and applications of NH3 in transportation area, where ammonia is applied i) as a hydrogen carrier involved in a catalytic reforming process tor H2 production, ii) in its reformed form i.e. H2-NH3 mixture for improved NH3 combustion in CI engines (as a carbon-free energy carrier), and iii) as a reductant in engine emission abatement under the incorporation of the NH3 reforming mechanism and catalytic aftertreatment systems. To implement the above studies, a prototype reformer system and a catalytic reaction mechanism were designed and proved capable

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22

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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23

Cerit, Ersen Recep. "Investigation Of The Effect Of Oxidation Filters On The Particulate Emissions Of Diesel Engines." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607561/index.pdf.

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Oxidation filters are used to decrease particulate emissions commonly. In this study, design of a particulate trap to produce an alternative, low cost filter has been aimed. An experimental setup has been installed according to standards to carry out tests of these designed filters. Electronic measurement and control systems have been attached to this setup to increase efficiency of experiments. Two filter designs have been used in the experiments. First design consists of aluminum wire cloth. Second design is sheet metal structure, which includes three longitudinal cells. Metal chip is used

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24

YAMAMOTO, Kazuhiro, Shingo SATAKE, Hiroshi YAMASHITA, Akira OBUCHI, and Junko UCHISAWA. "Simulation on Soot Oxidation with NO2 and O2 in a Diesel Particulate Filter." The Japan Society of Mechanical Engineers, 2007. http://hdl.handle.net/2237/9385.

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25

Munnis, Sean (Sean Andrew). "Synergistic effects of lubricant additive chemistry on ash properties impacting diesel particulate filter flow resistance and catalyst performance." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67798.

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Thesis (S.M. in Mechanical Engineering and S.M. in Naval Architecture and Marine Engineering)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 147-152).<br>Diesel particulate filters (DPF) have seen widespread use in recent years in both on- and offroad applications as an effective means for meeting the increasingly stringent particulate emission regulations. Overtime, engine-out particulate matter composed of soot and incombustible ash accumulate within the DPF. Although soot can

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26

Tamaldin, N. "Experimental investigation of emissions from a light duty diesel engine utilizing urea spray SCR system." Thesis, Coventry University, 2010. http://curve.coventry.ac.uk/open/items/6cd8a66e-246a-f0f5-6bdc-168e4cc3e3dc/1.

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Stringent pollutant regulations on diesel-powered vehicles have resulted in the development of new technologies to reduce emission of nitrogen oxides (NOx). The urea Selective Catalyst Reduction (SCR) system and Lean NOx Trap (LNT) have become the two promising solutions to this problem. Whilst the LNT results in a fuel penalty due to periodic regeneration, the SCR system with aqueous urea solution or ammonia gas reductants could provide a better solution with higher NOx reduction efficiency. This thesis describes an experimental investigation which has been designed for comparing the effect N

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27

ASTORSDOTTER, JENNIFER, JONAS RICKNELL, FIONA YU, and Axel Forsgren. "Utformning av avgaskatalysator." Thesis, KTH, Skolan för kemivetenskap (CHE), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-173552.

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Naturgas är ett alternativ till oljebaserade bränslen. Ur ett miljöperspektiv är naturgasen fördelaktig eftersom den vid förbränning ger mindre utsläpp av miljöfarliga ämnen än olja. I en diesel dual-fuel motor används diesel och naturgas som bränsle. Naturgas består till största delen av metan. För att oskadliggöra den del av metangasen som inte förbränns i motorn krävs en avgaskatalysator som kan bryta ned det relativt stabila metanet vid låga temperaturer. Målet med det här kandidatexamensarbetet är att tillverka och testa tre olika avgaskatalysatorer för nedbrytning av metan. De tre kataly

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28

Serve, Adrien. "Couche catalytiques conductrices ioniques pour filtre à particules autorégénérant." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1210/document.

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Les travaux s'inscrivent dans le développement de catalyseurs conducteurs ioniques à base de zircone stabilisée à l'oxyde d'yttrium (YSZ) pour l'oxydation des suies dans les filtres à particules (FAP) qui équipent les véhicules Diesel. L'oxydation de la suie sur YSZ a été observée à l'échelle nanométrique par microscopie électronique en transmission environnementale. La réaction d'oxydation se déroule à l'interface (20-40 nm) entre le catalyseur et la suie, l'activité étant liée au nombre de points de contact. Nous avons associé un vecteur d'oxygène mobile, l'argent, à YSZ. Les résultats montr

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29

Hasan, Mohammed. "The filtration and oxidation characteristics of a diesel oxidation catalyst and a catalyzed particulate filter : development of a 1-D 2-layer model /." Available online. Click here, 2005. http://sunshine.lib.mtu.edu/ETD/THESIS/hasanm/Thesis.pdf.

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30

Vam, Albert. "Kinetics of the Hydro-Deoxygenation of Stearic Acid over Palladium on Carbon Catalyst in Fixed-Bed Reactor for the Production of Renewable Diesel." University of Dayton / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1373313020.

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31

Leray, Alexis. "Identification des mécanismes physico-chimiques impliqués dans le post-traitement plasma des gaz d'échappement et études comparatives des différentes technologies plasma." Thesis, Orléans, 2012. http://www.theses.fr/2012ORLE2049.

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Le nouveau mode de combustion HCCI est adapté pour réduire les émissions d’oxydes d’azote et de particules fines issues de moteurs Diesel afin de respecter les futures normes d’émission Euro de plus en plus drastiques. Ce type de combustion se traduit par l’augmentation des émissions de monoxyde de carbone et des hydrocarbures et par une faible température des gaz d’échappement retardant ainsi leur conversion par le catalyseur d’oxydation Diesel (DOC). C’est dans ce contexte environnemental et économique que le couplage plasma-catalyseur apparait comme une solution intéressante afin d’améliore

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32

Ersson, Anders. "Materials for High-Temperature Catalytic Combustion." Doctoral thesis, KTH, Chemical Engineering and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3501.

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<p>Catalytic combustion is an environmentally friendlytechnique to combust fuels in e.g. gas turbines. Introducing acatalyst into the combustion chamber of a gas turbine allowscombustion outside the normal flammability limits. Hence, theadiabatic flame temperature may be lowered below the thresholdtemperature for thermal NO<sub>X</sub>formation while maintaining a stable combustion.However, several challenges are connected to the application ofcatalytic combustion in gas turbines. The first part of thisthesis reviews the use of catalytic combustion in gas turbines.The influence of the fuel has

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33

Xie, Yiquan. "On the performance of oxidation catalysts and SCR catalysts in the presence of alkali compounds representative of biofuel contaminants : from the commercial catalysts to the active phase." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066494/document.

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En raison des de l’augmentation de la pollution à l’échelle mondial du notamment aux gaz d'échappement des automobiles, de nouvelles réglementations d'émissions ont été mises en place depuis les années 1990. Ces règlementations ont conduit à une évolution des carburants traditionnels vers les biocarburants et à des systèmes de post-traitement des gaz d'échappement, notamment pour les moteurs diesel, de plus en plus sophistiqués. Ils comprennent à ce jour une série d'unités catalytiques, contenant un filtre à particules, un catalyseur d’oxydation pour traiter le monoxyde de carbone et les hydro

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De, Sousa Duarte Marisa Emanuel. "Mesure au coeur d'un réacteur de profils spatiaux et temporels sur les phases liquide et solide par analyses spectroscopiques." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1128.

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Cette thèse s'inscrit dans le domaine de la catalyse hétérogène pour des applications en raffinage et enpétrochimie. Comme objet d'étude, nous avons ciblé les catalyseurs d'hydrotraitement qui permettentd'éliminer les impuretés contenues dans le pétrole comme le soufre. Ces catalyseurs d'hydrotraitementsont constitués de sulfures de molybdène supportés sur alumine et généralement promus par du nickelou du cobalt.L'enjeu de la thèse porte sur la compréhension des phénomènes mis en jeu au cours de la sulfuration etde la stabilisation (cokage, passivation, évolution de la phase sulfure) des catal

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35

Hadjar, Abdelkader. "Catalyseurs électrochimiques pour le stockage et la réduction des oxydes d'azote (NOx)." Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10111.

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L’objectif de ce travail était de démontrer la possibilité de coupler sur un même catalyseur, la fonction de stockage et réduction des NOx (sur le baryum) avec un effet électrochimique reposant sur un système micropile. Ce système micropile est composé de nanoparticules catalytiques (Pt et Rh) déposés sur conducteur ionique par les ions O2- (YSZ) en contact avec un support conducteur électronique (SiC dopé) de façon à pouvoir générer, sous mélanges réactionnels, une force électromotrice capable de réduire électrochimiquement une partie des NOx sur le Pt et d’oxyder le CO, les hydrocarbures imb

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Vieitez, Calo Sara. "Diesel oxidation NOx adsorption catalysts." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/90838/.

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Worldwide usage of diesel engines has been rising rapidly and, accordingly, more stringent emission standards are introduced to lower the concentrations of diesel exhaust pollutants. NOx abatement is crucial, especially in diesel engines where controlling NOx is extremely difficult as oxygen is always in excess. The title and objective of this thesis arises from a novel approach, the diesel oxidation NOx adsorption catalyst (DONAC), where NOx is to be stored by a diesel oxidation catalyst (DOC). Supported platinum catalysts are the most used technology for diesel oxidation catalysts. Hence, th

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Campbell, Steven Bruce. "Characterisation of bimetallic diesel oxidation catalysts." Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=211242.

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With mobile emission limits worldwide becoming more stringent, catalysts have increased in complexity to achieve improved activities and selectivities. This has required catalysts to be characterised under more severe conditions e.g. after extended thermal treatments to simulate catalyst lifetime. Detailed characterisation may allow a deeper understanding of the interactions within these catalysts and lead to improvements in catalyst design. The characterisation of these and other sophisticated catalysts may be improved by the development of an advanced characterisation technique using quantit

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Simon, Antoine. "Optimisation énergétique de chaînes de traction hybrides essence et Diesel sous contrainte de polluants : Étude et validation expérimentale." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2010.

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L’hybridation électrique de la chaîne de traction automobile est l’une des solutions adoptées pour respecter les règlementations futures sur ses émissions. La stratégie de supervision de la chaîne de traction hybride répartit la puissance produite par le moteur à combustion interne et la machine électrique. Elle répond habituellement à un problème d’optimisation où l’objectif est de réduire la consommation de carburant mais nécessite à présent d’y ajouter les émissions polluantes. La chaîne de dépollution, placée à l’échappement du moteur, permet de diminuer la quantité de polluants émise dans

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Klein, Jennifer. "Effets de la combustion du noir de carbone sur l'adsorption des NOx sur un catalyseur quatre voies." Phd thesis, Université de Haute Alsace - Mulhouse, 2011. http://tel.archives-ouvertes.fr/tel-00675633.

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Récemment, les constructeurs automobiles se sont intéressés au développement des catalyseurs appelés quatre voies, destinés à diminuer simultanément les émissions polluantes des moteurs diesels par l'intermédiaire d'un seul monolithe catalytique. Dans cet objectif, plusieurs études ont montré que la capacité de stockage des NOx de ces catalyseurs est inhibée par la présence de suies. Les travaux présentés dans ce manuscrit s'inscrivent dans la compréhension des phénomènes en cause. Les résultats obtenus montrent que la présence de noir de carbone entraîne une diminution de la stabilité des nit

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Nilsson, Marita. "Hydrogen Generation for Fuel Cells in Auxiliary Power Systems." Doctoral thesis, KTH, Kemiteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10024.

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Heavy-duty trucks are in idle operation during long periods of time, providing the vehicles with electricity via the alternator at standstill. Idling trucks contribute to large amounts of emissions and high fuel consumption as a result of the low efficiency from fuel to electricity. Auxiliary power units, which operate independently of the main engine, are promising alternatives for supplying trucks with electricity. Fuel cell-based auxiliary power units could offer high efficiencies and low noise. The hydrogen required for the fuel cell could be generated in an onboard fuel reformer using the

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Väliheikki, A. (Ari). "Resistance of catalytic materials towards chemical impurities:the effect of sulphur and biomaterial-based compounds on the performance of DOC and SCR catalysts." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212845.

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Abstract Exhaust gas emissions, e.g. nitrogen oxides (NOx), hydrocarbons (HCs) and carbon monoxide (CO), are harmful to human health and the environment. Catalysis is an efficient method to decrease these emissions. Unfortunately, the fuels and lubricant oils may contain chemical impurities that are also present in exhaust gases. Thus, catalytic materials with high activity and chemical resistance towards impurities are needed in the abatement of exhaust gas emission. In this thesis, the aim was to gain new knowledge about the effects of chemical impurities on the behaviour and activity of the

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Franz, Rudolf. "Výzkum progresivních metod snižování obsahu škodlivých látek ve výfukových plynech vznětových motorů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-418061.

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The scope of this dissertation work is a description of modern methods of reducing exhaust emission in diesel engines. The fundamental part is the application of these methods for diesel engines for off-road use that means for engines that are used in tractors and road machines. The mentioned evidence for the practical utility of the results of this dissertation thesis in practice and their verification on the actual engine are given in the conclusion.

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Ndimande, Conrad. "Ideal hydrocracking catalysts for the conversion of FT wax to diesel." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9123.

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Includes bibliographical references.<br>The Fischer-Tropsch wax synthesis process and the subsequent upgrade of the wax to useful distillate fuels by mild hydrocracking is a well-known, economically viable method of producing liquid fuels, in particular diesel fuel. This project seeks to develop an ideal hydrocracking catalyst (i.e. a hydrocracking unit in which only primary cracking occurs) for the conversion of Fischer-Tropsch (FT) wax to diesel and to determine the effect of carbon monoxide on the activity and selectivity of the hydrocracking catalyst for possible integration of low tempera

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Lourenço, Álvaro Augusto de Mattos. "Otimização de sistema de pós-tratamento de gases de escape do tipo catalisadores seletivos em motores diesel." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265070.

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Orientadores: Pedro Teixeira Lacava, Cristiane Aparecida Martins<br>Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-16T15:33:30Z (GMT). No. of bitstreams: 1 Lourenco_AlvaroAugustodeMattos_M.pdf: 3468846 bytes, checksum: 9323ce32ffd4213746598242a62aa82f (MD5) Previous issue date: 2010<br>Resumo: A tecnologia de motores diesel tem sido guiada por legislações cada vez mais severas. Para cumprir estas legislações, os sistemas de controle de emissões estão se desenvolvendo rapidamente. Neste contexto,

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Mastrantuono, Laeticia. "Etude de l'élimination catalytique simultanée des NOx et des suies présents dans les gaz d'échappement Diesel." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210945.

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Caporali, Roberto. "Understanding the activity and the chemistry of Pd-based diesel oxidation catalysts." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669674.

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Several technologies offer a promising strategy for the exhaust after-treatment of diesel engines in which continuing to further thrift Pt/Pd alloy diesel oxidation catalysts (DOC) by increasing Pd content, the prospect of an essentially Pt-free DOC catalyst is very attractive because Pd is cheaper than Pt. However, to determine the viability of this approach a much better understanding of PdO/AI20 3 chemistry and reactivity is needed. Therefore, the aim of this work is (1) to improve the catalytic performance of the Pd based ?iesel oxidation catalyst by using different preparation method and

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Leistner, Kirsten. "Etude expérimentale et modélisation de l'oxydation catalysée de suies Diesel." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2012. http://tel.archives-ouvertes.fr/tel-00858763.

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L'objectif de cette thèse est de d'evelopper des modèles cinétiques pour la régénération des filtres à particules Diesel (FaP), basés sur la catalyse par des formulations du type platine-cérine-zircone (Pt/CexZr1−xO2). L'intérêt pratique de ce type de modèle est lié à son utilité dans le calcul de termes sources chimiques dans des modèles 3D, et à la possibilité d'étudier le mécanisme réactionnel de l'oxydation catalysée de la suie. Au coeur de cette analyse cinétique se situe l'estimation des paramètres d'Arrhenius pour un ensemble d'étapes réactionnelles, en ajustant les courbes théoriques (

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Bataille, Frédéric. "Hydrodésulfuration poussée des gazoles ; transformation d'alkyldibenzothiophènes sur catalyseurs bifonctionnels sulfure-acide." Poitiers, 2000. http://www.theses.fr/2000POIT2300.

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Dufreche, Stephen Thomas. "Effect of phosphorous poisoning on catalytic cracking of lipids for green diesel production." Diss., Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-04022008-220330.

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Evans, Jason Carter. "Influence of fuel sulfur content on emissions from diesel engines equipped with oxidation catalysts." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1594.

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Thesis (M.S.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains xii, 140 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 83-84).

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