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Dissertations / Theses on the topic 'Hexaaluminat'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Parsland, Charlotte. "Study of the activity of catalysts for the production of high quality biomass gasification gas : with emphasis on Ni-substituted Ba-hexaaluminates." Licentiate thesis, Linnéuniversitetet, Institutionen för byggd miljö och energiteknik (BET), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-55702.

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The fossil hydrocarbons are not inexhaustible, and their use is not without impact in our need of energy, fuels and hydrocarbons as building blocks for organic materials. The quest for renewable, environmentally more friendly technologies are in need and woody biomass is a promising candidate, well provided in the boreal parts of the world. To convert the constituents of wood into valuable gaseous products, suitable for the end use required, we need a reliable gasification technology. But to become an industrial application on full scale there are still a few issues to take into account since

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2

Elm, Svensson Erik. "Nanomaterials for high-temperature catalytic combustion." Licentiate thesis, Stockholm : School of Chemical Science, KTH, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4360.

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3

Negahdari, Zahra. "Reaction sintered alumina-lanthanum hexaaluminate composites." Aachen Shaker, 2009. http://d-nb.info/1000213897/04.

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4

Hissam, Jason C. "Characterization of nickel-substituted hexaaluminate catalysts." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5999.

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Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains vii, 78 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 74-76).

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5

Negahdari, Zahra [Verfasser]. "Reaction Sintered Alumina/Lanthanum Hexaaluminate Composites / Zahra Negahdari." Aachen : Shaker, 2010. http://d-nb.info/1124365702/34.

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6

Marzahl, Daniel-Timo [Verfasser]. "Rare-Earth-Doped Strontium Hexaaluminate Lasers / Daniel-Timo Marzahl." München : Verlag Dr. Hut, 2016. http://d-nb.info/1113336226/34.

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7

Schonhardt, Tobias. "Kinetic study of tar cracking/reforming over nickel-substitutedBa-hexaaluminate catalysts." Thesis, Linnéuniversitetet, Institutionen för teknik, TEK, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-22319.

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8

Gardner, Todd H. "Hexaaluminate catalysts for the partial oxidation of middle distillate fuels." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5116.

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Thesis (Ph. D.)--West Virginia University, 2007.<br>Title from document title page. Document formatted into pages; contains xii, 162 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 139-150).

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9

Zarur, Jury Juan Andrey 1970. "Catalytic combustion of methane with nanostructured barium hexaaluminate-based materials." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9116.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, February 2000.<br>Includes bibliographical references.<br>Catalytic combustion of methane has been widely studied as an alternative to gasphase homogeneous combustion. It allows combustion to occur at high levels of excess air, leading to more complete reaction and reduced hydrocarbon emissions. It further enables combustion to proceed at lower temperatures, significantly reducing the NO" production. Noble metal systems, such as platinum and palladium, have been studied as combustion catalysts. However, noble

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10

Laassiri, Said. "Synthèse et caractérisation des oxydes-mixtes nanocristallins de type hexaaluminate : propriétés en mobilité d'oxygène et en catalyse d'oxydation." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2314/document.

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Depuis les années 70, les oxydes mixtes de type hexaaluminate suscitent un intérêt certain pour les réactions catalytiques du fait de leur stabilité thermique élevée qui leur confère un fort potentiel pour les réactions à haute température. Cependant, la majorité des procédés de synthèse adoptés pour la préparation de ces derniers nécessite au moins une étape de traitement thermique à haute température afin d'achever le processus de cristallisation. Ainsi, les hexaaluminates préparées par voie chimique classique présentent des tailles de particules larges et des aires spécifiques réduites (&lt

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11

Loison, Lise Rebecca Verfasser], Rainer [Akademischer Betreuer] [Telle, and Jacques [Akademischer Betreuer] Poirier. "High temperature corrosion of calcium hexaaluminate with biomass slag / Lise Rebecca Loison ; Rainer Telle, Jacques Poirier." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1220836389/34.

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12

Loison, Lise Rebecca [Verfasser], Rainer [Akademischer Betreuer] Telle, and Jacques [Akademischer Betreuer] Poirier. "High temperature corrosion of calcium hexaaluminate with biomass slag / Lise Rebecca Loison ; Rainer Telle, Jacques Poirier." Aachen : Universitätsbibliothek der RWTH Aachen, 2018. http://d-nb.info/1220836389/34.

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13

Laassiri, Said. "Synthèse et caractérisation des oxydes-mixtes nanocristallins de type hexaaluminate : Propriétés en mobilité d'oxygène et en catalyse d'oxydation." Thesis, Université Laval, 2014. http://www.theses.ulaval.ca/2014/30479/30479.pdf.

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Depuis les années 1970, les oxydes mixtes de type hexaaluminate suscitent un intérêt certain pour les réactions catalytiques du fait de leur stabilité thermique élevée, leur conférant un fort potentiel pour les réactions se déroulant à haute température. Cependant, la majorité des procédés de synthèse adoptés pour la préparation de ces derniers nécessite au moins une étape de traitement thermique à haute température afin d’achever le processus de cristallisation. Ainsi, les hexaaluminates préparées par voie chimique classique présentent des tailles de particule larges et des aires spécifiques

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14

Jacoby, Jürgen. "Experimental Investigation of Catalytic Combustion of Simulated Gasified Biomass for Gas Turbine Applications." Doctoral thesis, KTH, Energy Technology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3234.

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15

Aidel, Soraya. "Microémulsions inverses et synthèse de catalyseurs hexaaluminate de baryum substitués par du manganèse : activité des catalyseurs dans l'oxydation du méthane." Lyon 1, 2005. http://www.theses.fr/2005LYO10078.

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L'objectif de ce travail est de synthétiser des catalyseurs actifs dans la réaction d'oxydation du méthane à partir d'une nouvelle méthode de synthèse. Les particules sont préparées par voie sol-gel à l'intérieur des gouttelettes d'eau d'une microémulsion inverse. Cette technique permet d'obtenir des nanoparticules de formes et de tailles prédéfinies par celles des gouttelettes qui leur ont donné naissance, et dont la distribution de taille est monodisperse. Deux microémulsions distinctes (l'une à base de NEODOL 91-6 et l'autre, de Triton® X-100) ont été étudiées puis utilisées afin de synthét

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16

Elm, Svensson Erik. "Nanotemplated High-Temperature Materials for Catalytic Combustion." Doctoral thesis, KTH, Kemiteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4800.

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Catalytic combustion is a promising technology for heat and power applications, especially gas turbines. By using catalytic combustion ultra low emissions of nitrogen oxides (NOX), carbon monoxide (CO) and unburned hydrocarbons (UHC) can be reached simultaneously, which is very difficult with conventional combustion technologies. Besides achieving low emission levels, catalytic combustion can stabilize the combustion and thereby be used to obtain stable combustion with low heating-value gases. This thesis is focused on the high-temperature part of the catalytic combustor. The level of performa

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17

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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18

Santiago, Redondo Marta. "Hexaaluiminate-type catalysts for n2o abatement." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/9111.

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En las últimas décadas, se han estudiado un gran número de los catalizadores para la descomposición catalítica de N2O. Sin embargo, la mayoría de estos catalizadores no muestran actividades razonables en condiciones reales de proceso Los hexaaluminatos sustituidos por metales, hasta ahora utilizados principalmente en la combustión catalítica de metano, poseen excelentes cualidades para ser prometedores candidatos para la descomposición de N2O a alta temperatura. Su estructura laminada, y la presencia de sitios redox proporcionan a este material una gran estabilidad química, una alta resistenci

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19

Kusar, Henrik. "Catalytic combustion of gasified waste." Doctoral thesis, KTH, Chemical Engineering and Technology, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3600.

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<p>This thesis concerns catalytic combustion for gas turbineapplication using a low heating-value (LHV) gas, derived fromgasified waste. The main research in catalytic combustionfocuses on methane as fuel, but an increasing interest isdirected towards catalytic combustion of LHV fuels. This thesisshows that it is possible to catalytically combust a LHV gasand to oxidize fuel-bound nitrogen (NH3) directly into N2without forming NOX. The first part of the thesis gives abackground to the system. It defines waste, shortly describesgasification and more thoroughly catalytic combustion.</p><p>The se

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20

MARTINAT, BEATRICE. "Etude de materiaux laser potentiels a matrice hexaaluminate de lanthane lamgal#1#1o#1#9. Activation par ti#3#+ et sensibilisation de la fluorescence de nd#3#+ par ti#3#+ et quelques autres ions." Paris 6, 1990. http://www.theses.fr/1990PA066607.

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Ce travail concerne la mise au point de nouveaux materiaux laser solides par activation, par differents ions, de la matrice hexaaluminate de lanthane lamgal#1#1o#1#9 (lma), type magnetoplombite. Des monocristaux de lma:ti ont ete elabores par procede verneuil. Le titane y est present simultanement aux etats d'oxydation 3+ et 4+. La matrice lma peut accueillir une proportion importante de titane (jusqu'a un atome de ti#3#+ ou de ti#4#+, remplacant un atome al#3#+ par unite formulaire). La resonance paramagnetique electronique a permis, d'une part de determiner les sites occupes par ti, d'autre

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21

Liu, You-Tin, and 劉祐廷. "A Study on the Host Effect on the Luminescent Properties of Alkaline-earth Hexaaluminate Phosphors." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/04828395616264082400.

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