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Dissertations / Theses on the topic 'Diesel exhaust oxidation catalyst'

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Published: 9 September 2021

Last updated: 29 July 2025

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

Hanaki, Yasunari, and Kazuhiro Yamamoto. "Microfluidic Simulation of Diesel Exhaust Gas and Soot Oxidation in Diesel Particulate Filter." SAE International, 2013. http://hdl.handle.net/2237/20341.

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9

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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10

Rankin, Bret A. "Design and development of a microwave enhanced diesel soot oxidation system." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=1058.

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Thesis (M.S.)--West Virginia University, 1999.<br>Title from document title page. Document formatted into pages; contains xiv, 347 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 272-276).

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11

González, García-Cervigón Maria Inmaculada. "Adsorption and oxidation of NO to NO2 over a renewable activated carbon from coconut." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13678.

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The NOx health and environmental problems make necessary to reduce this gaseous emission from different sources. Furthermore, its increase in the last years and the difficulties to remove it with after-treatment systems already in the market make more urgent the development of new techniques. The purpose of this investigation is to study the low temperature catalytic oxidation of NO to NO2 and its adsorption over a renewable activated carbon (AC) from coconut shell. The present research presents the results of experimental work carried out using a laboratory scale reactor to investigate the lo

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12

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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13

Peyrovi, Parnian. "Improved resistance to deactivation of coupled NH3-SCR/ DPF catalyst for diesel exhaust emissions control." Electronic Thesis or Diss., Université de Lille (2018-2021), 2018. http://www.theses.fr/2018LILUR041.

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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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14

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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15

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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16

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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17

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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18

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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19

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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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

DOSA, MELODJ. "Nanostructured ceria-based catalysts for automotive application - Formulation of nanostructured systems for diesel and gasoline-type engines." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2903500.

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22

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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23

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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24

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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25

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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26

Furtado, Nélida Sofia Tavares. "Ageing on commercial automotive catalysts, a structure reactivity study." Master's thesis, 2014. http://hdl.handle.net/10362/13934.

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Increasingly stringed regulations for diesel engine emissions have a significant impact on the required efficiency of DOC. Lowered DOC oxidation efficiency due to thermal aging effects influences the efficiency of the exhaust aftertreatment systems downstream of the DOC. In this work carried out in the Jean Le Rond d’Alembert Institute the effect of hydrothermal aging on the reactivity and structure of a commercial DOC was investigated. The characterization of the catalytic performance was carried out on a synthetic gas bench using carrots catalyst under conditions close to the realistic condi

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27

Liu, Yu-liang, and 劉育良. "Properties of Inorganic Salts in Diesel Exhaust PM2.5 from Heavy-duty Diesel Engine: Application of Waste Cooking Oil Biodiesel Blends and Diesel Particulate Filters with Diesel Oxidation Catalyst." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/hq4k75.

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碩士<br>嘉南藥理科技大學<br>環境工程與科學系暨研究所<br>99<br>This study used biodiesel from waste cooking oil in different proportions, added to commercially available diesel fuel. Biodiesel is divided into three in the order of commercially available super-diesel (B2), 10% biodiesel (B10), 20% biodiesel (B20). The water-soluble ions in the diesel PM2.5 aerosol was acquired from diesel engine under the load conditions of 0%, 25%, 50%. Additionally, comparison with a variety of biodiesel in different loads, the tests of applying the diesel particulate filter (DPF) installation of catalytic oxidizer (DOC) of the exh

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28

Sushma, B. R. "N-Radical Injection For Augmenting The Nox Removal In Diesel Engine Exhaust By Electric Discharges." Thesis, 2005. https://etd.iisc.ac.in/handle/2005/1484.

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Sushma, B. R. "N-Radical Injection For Augmenting The Nox Removal In Diesel Engine Exhaust By Electric Discharges." Thesis, 2005. http://etd.iisc.ernet.in/handle/2005/1484.

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30

"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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31

Oh, Harry Hyunsuk. "C3H6/NOx Interactions Over a Diesel Oxidation Catalyst: Hydrocarbon Oxidation Reaction Pathways." Thesis, 2012. http://hdl.handle.net/10012/6894.

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C3H6 oxidation over a Pt/Al2O3 catalyst with or without NOx present was investigated. In particular, its reaction mechanism was studied using diffuse reflectance infrared spectroscopy (DRIFTS), a reactor system designed for monolith-supported catalysts and a micro-reactor system designed for powder catalysts referred to as CATLAB. These experiments reveal that C3H6 oxidation is inhibited by the presence of NO, NO oxidation is inhibited by the presence of CeH6, and that adsorbed NOx can react with gas phase C3H6. DRIFTS and CATLAB results confirm the reaction between C3H6 and nitrates, which ar

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32

Chang, Shuai-Chun, and 張率群. "A Comparative Study of Oxidation and Reduction from the Diesel Exhaust." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/65284937262972516488.

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碩士<br>國立臺灣海洋大學<br>輪機工程系<br>101<br>Exhaust refers harm to human health and the surrounding environment of the material caused by pollution of the atmosphere, these substances may be gas, solid or liquid suspended solids, although not to the inhaled exhaust fumes have an immediate impact, but in the long run, still hazardous to human health. The air we breathe every day, is composed by a variety of chemical substances. In fact, the emission is mainly aimed for the ship turbines, whenever the ship moving commissioning, the chimneys black smoke, in addition to harmful to the body, the owner is the

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33

Irani, Karishma. "Characterization of Competitive Oxidation Reactions Over a Model Pt-Pd/Al2O3 Diesel Oxidation Catalyst." Thesis, 2009. http://hdl.handle.net/10012/4419.

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There has been a growing interest in using lean-burn engines due to their higher fuel economy and associated lower CO2 emissions. However, there are challenges in reducing NOX in an O2-rich (lean-burn) exhaust, and in low temperature soot oxidation. NOX storage/reduction (NSR) and selective catalytic reduction (SCR) are commercial NOX reduction technologies, and both are more efficient with levels of NO2 that are higher than those that are in engine exhaust (engine-out NO2 levels are ~10% of the total NOX). Therefore diesel oxidation catalysts are installed upstream of these technologies to pr

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Al-Adwani, Suad. "Predicting the Effect of Catalyst Axial Active Site Distributions on a Diesel Oxidation Catalyst Performance." Thesis, 2012. http://hdl.handle.net/10012/6938.

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Zone-coated diesel oxidation catalysts (DOCs) can be used to obtain overall improved performance in oxidation reaction extents. However, why this occurs and under what conditions an impact is expected are unknown. In order to demonstrate why these catalysts work better than their standard counterparts and how significant the improved performance is, the CO oxidation performance over a series of Pt−Pd/Al2O3 catalysts, each with a different distribution of precious metal down the length, while maintaining equivalent totals of precious metal, was modeled. Simulations with different flow rates, ra

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35

Abedi, Ali. "The Effect of an Axial Catalyst Distribution on the Performance of a Diesel Oxidation Catalyst and Inverse Hysteresis Phenomena during CO and C3H6 Oxidation." Thesis, 2012. http://hdl.handle.net/10012/6996.

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The Diesel Oxidation Catalyst (DOC) is a key component in the exhaust after-treatment system of diesel engines. In this study two aspects of a DOC were investigated: catalyst distribution and reactant species interactions. In the first part, the effect of an axial Pt distribution along a DOC was investigated by comparing a standard sample, with a homogeneous Pt distribution along the length, with a zoned sample, where the Pt was non-homogeneously distributed along the length. Temperature-programmed oxidation (TPO) and spatially-resolved gas-phase concentration measurement experiments were used

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Bhattacharyya, Anusuya. "DeNOx Studies In Diesel Exhaust Under AC/Pulse Energizations." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2488.

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It is the need of the hour to reduce the pollutants which poison our atmosphere and harm our health. The diesel engines are the most efficient IC engines in the world today, but paradoxically, they are also the engines which create the largest amounts of NOx, the pollutant that is most difficult to control with the existing technologies. In fact, the existing technologies are unable to meet the increasingly stringent standards for NOx. Even in bio-diesels, which in the future may be adopted as an important alternative fuel, NOx is the major pollutant. Thus not having a safe and stable method f

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Bhattacharyya, Anusuya. "DeNOx Studies In Diesel Exhaust Under AC/Pulse Energizations." Thesis, 2012. http://hdl.handle.net/2005/2488.

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It is the need of the hour to reduce the pollutants which poison our atmosphere and harm our health. The diesel engines are the most efficient IC engines in the world today, but paradoxically, they are also the engines which create the largest amounts of NOx, the pollutant that is most difficult to control with the existing technologies. In fact, the existing technologies are unable to meet the increasingly stringent standards for NOx. Even in bio-diesels, which in the future may be adopted as an important alternative fuel, NOx is the major pollutant. Thus not having a safe and stable method f

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38

Russell, April Elizabeth. "Spatial Temperature and Concentration Changes Following Heterogeneous Damage To a Model Diesel Oxidation Catalyst." Thesis, 2010. http://hdl.handle.net/10012/5643.

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Infra-Red thermography and spatially-resolved capillary inlet mass spectrometry (SpaciMS) have been used to characterize propylene oxidation along a Pt/Al2O3 monolith-supported catalyst, before and after heterogeneous deactivation. The combined techniques clearly show reaction location, and therefore catalyst use, and how these change with thermal and sulphur degradation. Following the heterogeneous thermal aging, the reaction zones at steady state were broader and located farther into the catalyst relative to those observed with the fresh catalyst. As well, the time for the temperature and

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39

Cedeño, Alejandro. "Sintering of a Pt/Al₂O₃ automotive exhaust oxidation catalyst effect on converter "warm-up" performance /." 1989. http://catalog.hathitrust.org/api/volumes/oclc/20051839.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1989.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 183-192).

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40

Kivevele, Thomas. "Oxidation stability of biodiesel from non-edible oils." 2011. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000630.

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M. Tech. Mechanical Engineering.<br>Biodiesel, produced from the transesterification of vegetable oils or animal fats with simple alcohol in the presence of a catalyst, is well positioned to replace petroleum-based diesel. Biodiesel is a non-toxic, biodegradable and renewable fuel. Despite its advantages, the chemical nature of biodiesel makes it more susceptible to oxidation compared to mineral diesel during long-term storage. The production of Croton Oil Methyl Ester (COME), Moringa Oil Methyl Ester (MOME) and Jatropha Oil Methyl Ester (JOME) was therefore carried out. Also, a determination

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41

賴文傑. "On the promotion of vehicle exhaust pollutant oxidation activity by catalyst prepared with hexadecyl trimethyl ammonium bromide-assisted impregnation method." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qhkxf7.

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碩士<br>國立聯合大學<br>環境與安全衛生工程學系碩士班<br>106<br>Impregnation method for the current automotive catalyst preparation technology was one of simple operating conditions. According to a previous study, impregnation method has some defects, such as uneven coating of surface material problems, that will affect the catalyst on the pollutants Removal rate. This research aimed to improve the coating of surface material and enhance the catalytic purification capacity. Hexadecyl trimethyl ammonium bromide (CTAB) with different concentrations was added to modify the catalyst with a series of experiments to impro

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42

Leung, Emi. "Mechanistic Investigation of Novel Niobium-Based Materials as Enhanced Oxygen Storage Components and Innovative CO Oxidation Catalyst Support for Environmental Emission Control Systems." Thesis, 2016. https://doi.org/10.7916/D8N016FM.

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Nb-doped ZrO₂-CeO₂-Y₂O₃ solid solution (Nb-ZrCeYO) is studied as a possible oxygen storage component in three way automobile exhaust catalysts. It shows enhanced oxygen storage (OS) capacity with a higher extent of reduction at temperatures within the typical operating range of three-way catalyst compared with solid solutions without Nb. However, after several days of exposure to ambient air, the OS behavior of the Nb-doped samples shows significant degradation. Degradation is slowed for samples stored in evacuated environments (i.e. vacuum sealed glass tubes). NbOₓ segregation to the surface

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