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Tesi sul tema "Automobiles Catalytic converters"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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1

Clarkson, Rory John. "A theoretical and experimental study of automotive catalytic converters." Thesis, Coventry University, 1995. http://curve.coventry.ac.uk/open/items/cb5d72be-4f37-c710-5e08-df9c44201b6f/1.

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Abstract (sommario):

In response to the increasingly widespread use of catalytic converters for meeting automotive exhaust emission regulations considerable attention is currently being directed towards improving their performance. Experimental analysis is costly and time consuming. A desirable alternative is computational modelling. This thesis describes the development of a fully integrated computational model for simulating monolith type automotive catalytic converters. Two commercial CFD codes, PHOENICS and STAR-CD, were utilised to implement established techniques for modelling the flow field in catalyst asse

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2

Quadri, Syed Saleem. "The effect of oblique entry into an automotive catalyst on the flow distribution within the monolith." Thesis, Coventry University, 2008. http://curve.coventry.ac.uk/open/items/bccfd1aa-e70b-7608-3d41-121b43630c1d/1.

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Abstract (sommario):

Automotive catalytic converters are increasingly used to reduce emissions from internal combustion engines to comply with emission regulations. Maldistributed flow across the catalyst affects its warm up, light off time, ageing, and conversion efficiency. This thesis concerns flow distribution in automotive catalytic converters and methods to improve CFD predictions. Previous studies showed that modelling the monolith flow resistance using the Hagen- Poiseuille’s formulation under predicted flow maldistribution. The predictions were improved by incorporating an additional pressure loss term V2

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3

Manlee, Tamaryn. "The identification of factors that contribute to the competitive advantage of the catalytic converter industry cluster in the Eastern Cape." Thesis, Port Elizabeth Technikon, 2002. http://hdl.handle.net/10948/99.

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Abstract (sommario):

The research problem addressed in this study was to determine what the main factors are that contribute to the competitive advantage of the catalytic converter industry cluster in the Eastern Cape. To achieve this objective theoretical models of competitive advantage and literature of industry clustering were identified. For the models on competitive advantage, Porter’s diamond was used for national competitive advantage and Porter’s model on the competitive environment, which affects the competitive advantage of a region. Other theories on competitive advantage of cities and regions were iden

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4

Haimad, N. "A theoretical and experimental investigation of the flow performance of automotive catalytic converters." Thesis, Coventry University, 1997. http://curve.coventry.ac.uk/open/items/3f51aa95-571c-73d5-bee3-4b523cab0a1c/1.

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Abstract (sommario):

Considerable research is being carried out into the parameters that affect catalyst performance in order to meet the latest emission regulations. The conversion efficiency and the durability of automotive catalytic converters are significantly dependent on catalyst flow performance. Related investigations are commonly conducted using CFD techniques which represent an inexpensive and fast alternative to experimental methods. This thesis focuses on the flow performance of automotive catalytic converters using both experimental and computational techniques. The work describes the effects of inlet

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5

Kuczka, Allan Anthony. "Conceptual design analysis of a collection and processing system for scrapped catalytic converters." Master's thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-01202010-020249/.

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6

Yamin, A. K. M. "Pulsating flow studies in a planar wide-angled diffuser upstream of automotive catalyst monoliths." Thesis, Coventry University, 2012. http://curve.coventry.ac.uk/open/items/e82aae35-8737-48e2-b73d-4758a88f5e1a/1.

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Abstract (sommario):

Automotive catalytic converters are used extensively in the automotive industry to reduce toxic pollutants from vehicle exhausts. The flow across automotive exhaust catalysts is distributed by a sudden expansion and has a significant effect on their conversion efficiency. The exhaust gas is pulsating and flow distribution is a function of engine operating condition, namely speed (frequency), load (flow rate) and pressure loss across the monolith. The aims of this study are to provide insight into the development of the pulsating flow field within the diffuser under isothermal conditions and to

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7

Crawford, Ian Stewart. "Catalytic reduction of nitric oxide by carbon monoxide or hydrogen over a Monel metal catalyst." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09EN/09enc899.pdf.

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8

Heather, Keith Buxmann. "The determination of a strategy for the implementation of learnerships in the catalytic converter canning industry in the Eastern Cape." Thesis, Port Elizabeth Technikon, 2002. http://hdl.handle.net/10948/117.

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Abstract (sommario):

The Eastern Cape Region, once had sufficient job seekers with automotive component manufacturing skills and experience. Indications are that this pool has been desiccated. The draining of skills out of the area is starting to affect growth potential and competitiveness in the industry in the area. In 1998, the Skills Development Act was passed to implement the National Skills Development Plan, and to encourage employers to train personnel. The strategy promotes a three faceted approach to encourage the development of skills; Workplace Skills Development Plans, Learnerships and Sector Specific

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9

Ludik, Henk. "An investigation into the impact of the substitution of platinum in auto catalysts on the South African economy." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/989.

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Abstract (sommario):

Thesis (MBA (Business Management))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: South Africa has historically benefited from its mineral wealth, building one of the leading mining industries in the world. South Africa holds the worlds largest known PGM (or precious group metals) resource base (in a geological formation known as the Bushveld Igneous Complex), with an estimated life of 230 years (at current mining rates). This precious commodity is a precious source of both the direct as well as indirect contributions into the South African economy, as well as a leading source of

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10

MORCELLI, CLAUDIA P. R. "Elementos do grupo da platina (Pt, Pd e Rh) emitidos por conversores cataliticos de automoveis: um estudo realizado em solos localizados as margens da Rodovia dos Bandeirantes no Estado de Sao Paulo." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11222.

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Abstract (sommario):

Made available in DSpace on 2014-10-09T12:49:39Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:11Z (GMT). No. of bitstreams: 1 09987.pdf: 6803672 bytes, checksum: c070bf0956c20ddeb4d6cb89d8d1535c (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP<br>FAPESP:00/02118-9

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11

Soiné, Robert Paul. "An analysis of the performance of a South African stainless steel manufacturer in localising the demand for corrosion resistant steels within the Eastern Cape catalytic converter industry." Thesis, Port Elizabeth Technikon, 2004. http://hdl.handle.net/10948/200.

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Abstract (sommario):

Commercial decisions are been made with respect to the competitive advantage of manufacturing catalytic converters in South Africa. This thesis identifies those factors relating to the sourcing of stainless steel and the impact it has of securing future business in a competitive environment. The catalytic converter industry requires the support of a stainless steel plant that provides high quality products at a competitive price, while keeping abreast with international developments.

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12

Harvey, Adam. "The oxidative storage and reductive release of sulphur compounds by automobile catalytic converters." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/10941.

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Abstract (sommario):

Hydrogen sulphide emission by catalytic converter-fitted automobiles is a problem, because the gas has an extremely unpleasant odour, which is detectable by the human nose at concentrations below 1 ppm. The problematic hydrogen sulphide emissions are produced by the "storage release" mechanism, in which the catalyst absorbs sulphur dioxide during net oxidising conditions and releases it very rapidly as hydrogen sulphide when the stoichiometry of the exhaust gas changes to net reducing. After a prolonged period of oxidative storage the peak emission of hydrogen sulphide by "storage release" can

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13

Subramanian, Bhargavi. "Exploring Neoteric Solvent Extractants: Applications in the Removal of Sorbates From Solid Surfaces and Regeneration of Automotive Catalytic Converters." Cincinnati, Ohio University of Cincinnati, 2007. http://www.ohiolink.edu/etd/view.cgi?ucin1178075024.

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Abstract (sommario):

Thesis (M.S.)--University of Cincinnati, 2007.<br>Title from electronic thesis title page (viewed July 12, 2007). Includes abstract. Keywords: Solvent extraction; Soils; Pentachlorophenol; Automobile catalytic converters; Metal chelating agents Includes bibliographical references.

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14

Schwaller, Jean-Michel. "Etude et conception d'un support de catalyseur de post-combustion automobile a matrice metallique." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13070.

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Abstract (sommario):

Conception d'un pot catalytique et etude de l'efficacite de la catalyse. Mise au point d'un support metallique. Preparation du support par passivation de l'alliage fer-chrome-aluminium. Stabilisation de l'alumine par ajout de terres rares. Utilisation de platine et de palladium comme materiaux catalytiques

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15

Michel, Pierre. "Gestion d'énergie d’un véhicule hybride électrique-essence équipé d'un catalyseur par minimisation conjointe consommation-pollution : étude et validation expérimentale." Thesis, Orléans, 2015. http://www.theses.fr/2015ORLE2006.

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Abstract (sommario):

Dans les véhicules hybrides électrique-essence, les stratégies de gestion de l’énergie déterminent la répartition des flux d'énergies des moteurs thermique et électrique avec pour objectif classique la réduction de la consommation. Par ailleurs, pour respecter les seuils réglementaires d’émissions polluantes, les motorisations essence sont équipées d’un catalyseur 3-voies chauffé par les gaz d’échappement. Une fois amorcé, ce catalyseur convertit presque entièrement les émissions polluantes du moteur. C’est donc au démarrage que la plupart de la pollution est émise, lorsque le catalyseur est f

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16

Yao, Dongping. "Three-way automobiles converters: Modeling reaction and diffusion in the catalytic layers." Thesis, 2001. http://hdl.handle.net/1911/17480.

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Abstract (sommario):

A novel multi-scale model is developed to describe in detail the reaction and diffusion processes taking place in the catalytic layers of three-way automobile converters. This comprehensive model considers the simultaneous oxidation of carbon monoxide, hydrogen and one hydrocarbon species, as well as the reduction of nitrogen oxide. The resulting problem of coupled and nonlinear ordinary differential equations is solved using an adaptive spline collocation technique. Our computations reveal significant diffusional limitations in the catalytic layers and important interactions among the various

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17

Piedras, Francisco Javier vega. "Hydrometallurgical approach for recovery of pgms from spent automobile catalytic converters." Master's thesis, 2019. http://hdl.handle.net/10400.1/13968.

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Abstract (sommario):

The recovery of platinum-group metals (PGMs) from secondary sources, such as spent devices like automobile catalytic converters (ACC), has been gaining interest in the last decades due to their scarcity in the earth crust and their high demand. Their extended applications among different industries, together with their difficulty to be replaced by other materials, has created the urge to develop new technologies for PGMs recovery that can help with the supply requirements, while being environmentally friendlier than the existing processes. Hydrometallurgical techniques represent a possib

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18

Hsieh, Tung-Fu, and 謝東甫. "Study on Secondary Air Injection And The Effect of Temperature on Catalytic Converter for Automobile." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/8ue423.

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Abstract (sommario):

碩士<br>國立虎尾科技大學<br>機械與機電工程研究所<br>101<br>In this study, secondary air was injected into the exhaust of automobile to reduce the time needed for heating up the catalyst. By doing this, the catalyst can reach its working temperature faster, which will be beneficial for the purification of exhaust gas. To carry out the experiment, secondary air was injected at two locations, namely the head exhaust manifold and the head 4-in-2 exhaust manifold of the engine. In addition, one-way valve was installed to create vacuum effect inside the exhaust pipe, resulting from the positive/negative pressure formed

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19

Wu, Wen-Jenq, and 吳文正. "A Study on the Effects of Engine Speed and the Catalytic Converter on Automobile VOCs Emission." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/63038271991335072019.

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Abstract (sommario):

碩士<br>國立成功大學<br>環境工程學系<br>86<br>A Study on the Effects of Engine Speed and theCatalytic Converter on Automobile VOCs Emission Volatile Organic Compounds (VOCs), such as 1,3-butadiene, benzene, toluene and xylenes, are found in automobile exhaust and other sources. They are known to be neurotoxic, mutagenic or carcinogenic, and thus harzadous to human nervous system and skin.ere used for this study. The engine was fueled separately with 92 and 95 Lead-free gasoline, and was operated at 1000

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