Thematische Bibliographien / Fluorinated metal oxides catalysts

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Auswahl der wissenschaftlichen Literatur zum Thema „Fluorinated metal oxides catalysts“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Fluorinated metal oxides catalysts"

Kemnitz, Erhard, und Dirk-Henning Menz. „Fluorinated metal oxides and metal fluorides as heterogeneous catalysts“. Progress in Solid State Chemistry 26, Nr. 2 (Januar 1998): 97–153. http://dx.doi.org/10.1016/s0079-6786(98)00003-x.

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Chekryshkin, Yu S., T. A. Rozdyalovskaya, Z. R. Ismagilov, M. A. Kerzhentsev, O. A. Tetenova und A. A. Fedorov. „Deep Oxidation of Fluorinated Hydrocarbons in Molten Catalysts“. Eurasian Chemico-Technological Journal 5, Nr. 2 (05.04.2016): 137. http://dx.doi.org/10.18321/ectj293.

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The oxidation of fluorine-containing organic substances: fluorocarbon liquid M-1, fluorinated alcohol H(CF2)8CH2OH, and powder polytetrafluoroethylene with air has been studied in melts: NaOH; 43 mol.% LiCl - 33 mol.% NaCl - 24 mol.% KCl (eutectic mixture); (LiCl-NaCl-KCl)eutec. + 10 mass.% V2O5; (LiCl-NaCl-KCl) eutec. + 15 mass.% V2O5; 56 mol.% Na2CO3 - 44 mol.% K2CO3 (eutectic), (Na2CO3 K2CO3)eutect. + 15 mass.% V2O5, and K3V5O14. The compositions of the melts have been examined by GC, DTA, chemical analysis and XRD, and they have been shown to change during the reaction, depending on the composition and partial pressure of the gaseous products over the melt surface. The alkali metal chloride melt containing 15 mass.% V2O5 has been found to be most stable to the action of fluorine compounds. Possibility of deep oxidation of fluorine-containing organic substances in melts based on hydroxides, carbonates and chlorides of alkali metals doped with oxides of vanadium has been proved. The process of deep oxidation of fluorinated hydrocarbons is accompanied by formation of an equilibrium mixture containing hydroxides, carbonates, chlorides and fluorides of alkali metals, as well as their vanadates, if V2O5 additive is used. The relative amounts of these substances in molten systems are determined by the partial pressure of oxygen, CO2 and water vapor.

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Tanuma, T., H. Okamoto, K. Ohnishi, S. Morikawa und T. Suzuki. „Partially Fluorinated Metal Oxide Catalysts for a Friedel–Crafts-type Reaction of Dichlorofluoromethane with Tetrafluoroethylene“. Catalysis Letters 136, Nr. 1-2 (30.10.2009): 77–82. http://dx.doi.org/10.1007/s10562-009-0197-3.

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Siler, C. G. F., R. J. Madix und C. M. Friend. „Designing for selectivity: weak interactions and the competition for reactive sites on gold catalysts“. Faraday Discussions 188 (2016): 355–68. http://dx.doi.org/10.1039/c5fd00192g.

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A major challenge in heterogeneous catalysis is controlling reaction selectivity, especially in complex environments. When more than one species is present in the gas mixture, the competition for binding sites on the surface of a catalyst is an important factor in determining reaction selectivity and activity. We establish an experimental hierarchy for the binding of a series of reaction intermediates on Au(111) and demonstrate that this hierarchy accounts for reaction selectivity on both the single crystal surface and under operating catalytic conditions at atmospheric pressure using a nanoporous Au catalyst. A partial set of measurements of relative binding has been measured by others on other catalyst materials, including Ag, Pd and metal oxide surfaces; a comparison demonstrates the generality of this concept and identifies differences in the trends. Theoretical calculations for a subset of reactants on Au(111) show that weak van der Waals interactions are key to predicting the hierarchy of binding strengths for alkoxides bound to Au(111). This hierarchy is key to the control of the selectivity for partial oxidation of alcohols to esters on both Au surfaces and under working catalytic conditions using nanoporous gold. The selectivity depends on the competition for active sites among key intermediates. New results probing the effect of fluorine substitution are also presented to extend the relation of reaction selectivity to the hierarchy of binding. Motivated by an interest in synthetic manipulation of fluorinated organics, we specifically investigated the influence of the –CF₃ group on alcohol reactivity and selectivity. 2,2,2-Trifluoroethanol couples on O-covered Au(111) to yield CF₃CH₂O–C(O)(CF₃), but in the presence of methanol or ethanol it preferentially forms the respective 2,2,2-trifluoroethoxy-esters. The ester is not the dominant product in any of these cases, though, indicating that the rate of β-H elimination from adsorbed trifluoroethoxy is slower than that for either adsorbed methoxy or ethoxy, consistent with their relative estimated β-C–H bond strengths. The measured equilibrium constants for the competition for binding to the surface are 2.9 and 0.38 for ethanol and methanol, respectively, vs. 2,2,2-trifluoroethanol, indicating that the binding strength of 2,2,2-trifluoroethoxy is weaker than ethoxy, but stronger than methoxy. These results are consistent with weakening of the interactions between the surface and the alkyl group due to Pauli repulsion of the electron-rich CF₃ group from the surface, which offsets the van der Waals attraction. These experiments provide guiding principles for understanding the effect of fluorination on heterogeneous synthesis and further demonstrate the key role of molecular structure in determining reaction selectivity.

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Puzhel, A. O., V. A. Borisov, A. R. Osipov, I. V. Petlin, A. D. Kiselev und L. N. Adeeva. „Fluoride processing of oil hydrocarbon cracking catalyst with REE concentrate extraction“. Izvestiya Vuzov Tsvetnaya Metallurgiya (Universities Proceedings Non-Ferrous Metallurgy) 1, Nr. 1 (11.02.2021): 28–35. http://dx.doi.org/10.17073/0021-3438-2021-1-28-35.

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It is proposed to use a spent cracking catalyst of petroleum hydrocarbons containing 1 wt.% of rare earth element (REE) oxides as an alternative REE feed source. The study covers the process of removing silicon in the form of ammonium hexafluorosilicate (NH4)2SiF6 by sintering an oil cracking catalyst sample with NH4F and subsequent (NH4)2SiF6 sublimation to produce an aluminum-containing concentrate of rare earth elements. The orthogonal central compositional planning of the experiment was used to study the effect of three factors: sublimation temperature (350 to 400 °С), duration (40 to 80 min), and weight of the catalyst fluorinated sintered mass (5 to 10 g) on the (NH4)2SiF6 sublimation completeness. Results obtained in the experiment were used to build a second-order model, which correlate with experimental data. The dynamics of (NH4)2SiF6 sublimation removal was determined for sublimation durations of τ = 10, 20, 40 and 80 min at processing temperatures of 350, 375 and 400 °C. The (NH4)2SiF6 removal degree values calculated based on the second-order model for τ = 44, 48, 52, 56, 60, 64, 68, 72, and 76 min fit well the experimental curves. Spectra of fluorinated catalyst samples before and after sublimation were studied using X-ray phase analysis and IR spectroscopy. The data of IR spectroscopy and X-ray phase analysis are in good agreement and show that (NH4)2SiF6, (NH4)3AlF6 and unreacted NH4F are present in the catalyst with NH4F sintered mass, and only aluminum compounds are detected – NH4AlF4 and AlF3 after sublimation. These data indicate the completeness of the sublimation removal of silicon from the catalyst and NH4F sintered mass with NH4AlF4 and AlF3 aluminum compounds only observed after sublimation. REE concentration is 15 % due to silicon removal.

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Xi, Jianfei, Jianzhong Liu, Yang Wang, Yourui Hu, Yanwei Zhang und Junhu Zhou. „Metal Oxides as Catalysts for Boron Oxidation“. Journal of Propulsion and Power 30, Nr. 1 (Januar 2014): 47–53. http://dx.doi.org/10.2514/1.b35037.

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Wang, Fei, Jianzhun Jiang und Bin Wang. „Recent In Situ/Operando Spectroscopy Studies of Heterogeneous Catalysis with Reducible Metal Oxides as Supports“. Catalysts 9, Nr. 5 (23.05.2019): 477. http://dx.doi.org/10.3390/catal9050477.

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For heterogeneous catalysis, the metal catalysts supported on reducible metal oxides, especially CeO2 and TiO2, have long been a research focus because of their excellent catalytic performance in a variety of catalytic reactions. Detailed understanding of the promotion effect of reducible metal oxides on catalytic reactions is beneficial to the rational design of new catalysts. The important catalytic roles of reducible metal oxides are attributed to their intimate interactions with the supported metals (e.g., strong metal-support interaction, electronic metal-support interaction) and unique support structures (e.g., oxygen vacancy, reversible valence change, surface hydroxyl). However, the structures of the catalysts and reaction mechanisms are strongly affected by environmental conditions. For this reason, in situ/operando spectroscopy studies under working conditions are necessary to obtain accurate information about the structure-activity relationship. In this review, the recent applications of the in situ/operando spectroscopy methodology on metal catalysts with reducible metal oxides as supports are summarized.

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Vasić, Katja, Gordana Hojnik Podrepšek, Željko Knez und Maja Leitgeb. „Biodiesel Production Using Solid Acid Catalysts Based on Metal Oxides“. Catalysts 10, Nr. 2 (17.02.2020): 237. http://dx.doi.org/10.3390/catal10020237.

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The development of solid acid catalysts, especially based on metal oxides and different magnetic nanoparticles, gained much awareness recently as a result of the development of different nano-based materials. Solid acid catalysts based on metal oxides are promising for the (trans)esterification reactions of different oils and waste materials for biodiesel production. This review gives a brief overview of recent developments in various solid acid catalysts based on different metal oxides, such as zirconia, zinc, titanium, iron, tungsten, and magnetic materials, where the catalysts are optimized for various reaction parameters, such as the amount of catalyst, molar ratio of oil to alcohol, reaction time, and temperature. Furthermore, yields and conversions for biodiesel production are compared. Such metal-oxide-based solid acid catalysts provide more sustainable, green, and easy-separation synthesis routes with high catalytic activity and reusability than traditionally used catalysts.

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Huang, Keke, Yu Sun, Yuan Zhang, Xiyang Wang, Wei Zhang und Shouhua Feng. „Hollow‐Structured Metal Oxides as Oxygen‐Related Catalysts“. Advanced Materials 31, Nr. 38 (14.11.2018): 1801430. http://dx.doi.org/10.1002/adma.201801430.

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Li, Runze, Lei Luo, Xinlong Ma, Wenlong Wu, Menglin Wang und Jie Zeng. „Single atoms supported on metal oxides for energy catalysis“. Journal of Materials Chemistry A 10, Nr. 11 (2022): 5717–42. http://dx.doi.org/10.1039/d1ta08016d.

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Dissertationen zum Thema "Fluorinated metal oxides catalysts"

Ben, Salem Roua. „Catalyseurs à base d'oxydes métalliques fluorés : synthèse, caractérisations et applications catalytiques“. Electronic Thesis or Diss., Lyon 1, 2023. https://n2t.net/ark:/47881/m6c53kx4.

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Ces travaux de thèse portent sur la synthèse de nouveaux catalyseurs fluorés, utilisant d’acide trifluoroacétique (TFAH) comme précurseur de Fluor, leurs caractérisations physico-chimiques et l’étude de leurs propriétés acido-basiques en phases gazeuse et aqueuse. Une première méthode consiste en l’échange anionique entre des supports oxo/hydroxo de titane, de niobium ou de zirconium, de surfaces spécifiques élevées, et une solution de TFAH. La rétention du fluor, avant et après calcination, est plus importante au contact du support à base de zirconium. La présence de fluor inhibe la basicité de la zircone et génère une acidité de Brønsted expliqué par l’effet électroattracteur de fluor et rend la surface du catalyseur plus hydrophobe. La zircone fluorée convertit sélectivement l’isopropanol en propène en phase gazeuse et la dihydroxyacétone en pyruvaldéhyde dans l’eau. La deuxième synthèse est une nouvelle approche multi-étape couplant la décomposition d’un précurseur de fluor à base d’yttrium Y(TFA)3(H2O)3 en NPs de YF3 et leur incorporation dans un gel de TiO2. Différentes techniques de caractérisations physico-chimique (XPS, DRX, RMN 19F) indiquent que le fluor existe sous la forme YF3 dans la matrice de TiO2, stable après une calcination à 500°C. YF3 dispersé dans TiO2 de surface spécifique élevée catalyse efficacement la conversion de la dihydroxyacetone (DHA) dans l’eau
This thesis work focuses on the synthesis of new fluorinated metal catalysts, using trifluoroacetic acid (TFAH) as fluorine precursor, their physico-chemical characterizations and the study of their acid-base properties in the gas and aqueous phases. The first synthesis is the anionic exchange between oxo/hydroxo supports of titanium, of niobium and of zirconium, with high specific areas, and a solution of TFAH. The fluorine retention, before and after calcination, is greater using the zirconium support. The presence of fluorine inhibits the basicity of the zirconia and generates Brønsted acidity due to the electron-withdrawing effect of fluorine and makes the catalyst’s surface more hydrophobic. Fluorinated zirconia produces selectively propene from isopropanol in gas phase and pyruvaldehyde from dihydroxyacetone in water. The second synthesis is new multi-step approach coupling the decomposition of an yttrium-based fluorine precursor Y(TFA)3(H2O)3 into YF3 NPs and their incorporation into TiO2. Various physico-chemical characterization techniques (XPS, XRD, 19F NMR) indicate that fluorine exists in the form of YF3 in the TiO2 matrix, stable at after calcination at 500°C. YF3 dispersed in TiO2 of high surface area catalyzes efficiently the conversion of dihydroxyacetone (DHA) in water

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Ren, Xiaolin. „Synthesis and characterisation of metal oxides and fluorinated perovskite-related oxides“. Thesis, Open University, 2005. http://oro.open.ac.uk/54200/.

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Perovskite-related materials of composition LaFe_1-xCo_xO₃ prepared by conventional calcination methods and mechanical milling are shown by temperature programmed reduction to be more susceptible to reduction in a flowing mixture of hydrogen and nitrogen by the incorporation of cobalt. X-ray powder diffraction and Mossbauer spectroscopy show that in iron-rich systems the limited reduction of iron and cobalt leads to the segregation of discrete metallic phases without destruction of the perovskite structure. In cobalt-rich systems, the reduction of Co³⁺ to Co^o precedes complete reduction of Fe³⁺ and the segregation of alloy and metal phases is accompanied by destruction of the perovskite structure. Phases made by milling techniques were of smaller particle size and are more susceptible to hydrogen reduction than their counterparts made by conventional techniques. Materials of the type La_0.5Sr_0.5MO₃ (M= Fe, Co) made by calcination methods are more susceptible to reduction when the transition metal M is cobalt as compared to iron. Perovskite-related oxides of composition La_1-xSr_xFe_1-yCo_yO₃ have been fluorinated by reaction with poly(vinylidene fluoride). The materials have been characterised by X-ray powder diffraction and Mossbauer spectroscopy. Fluorination induces a reduction in the oxidation state of iron from Fe⁴⁺ to Fe³⁺. The fluorinated materials were magnetically ordered at 298 K. Compounds of the type SrFe_1-xSn_xO₃ were found to contain Fe⁵⁺ and Fe³⁺. Fluorination resulted in reduction of the transition metal to Fe³⁺ and, in iron-rich systems, magnetic order. The compound Ba₂SnO₄ which adopts the K₂NiF₄-type structure has also been fluorinated by reaction with zinc fluoride. X-ray powder diffraction shows an enlargement of the unit cell of the fluorinated phase along the c-axis. Small particle iron- and vanadium- antimonate have been prepared by mechanical milling methods. The phases have been examined by M6ssbauer spectroscopy and can be formulated M³⁺Sb⁵⁺O₄ (M = Fe, V). Thermal analysis suggests that the vanadium animonate formed by milling V₂O₅ and Sb₂O₃ in an inert atmosphere may be oxygen deficient. X-ray powder diffraction shows that milling also induces the phase transformation of the cubic senarmontite Sb₂O₃ form to the orthorhombic valentinite Sb₂O₃ form and of a-Sb₂O₄ to B-Sb₂O₄.

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Abdoullah, Mohamad. „Supported transition metal oxides as solid base catalysts“. Thesis, University of Huddersfield, 2016. http://eprints.hud.ac.uk/id/eprint/28325/.

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The initial objective of the work studied here was to investigate the effects of isomorphously-substituted transition metals in lattice sites in Layered Double Hydroxides (LDHs) in terms of basicity and catalytic activity in base-catalysed reactions and oxidation reactions. Experiments in which copper(II), nickel(II), cobalt(II), zinc(II) and iron(III) were substituted in the lattice of synthetic hydrotalcites showed that, on calcination, the resultant mixed oxides arising from hydrotalcites containing copper(II) exhibited the greatest enhancement of catalytic activity. Test reactions were the conversion of 4-methylpentan-2-ol to methylisobutylketone, the oxidation of benzyl alcohol and the Henry reaction between benzaldehyde and nitromethane. Results showed conclusively that copper(II) imparted base catalytic activity to the mixed metal oxides formed on calcination of the LDHs. This was confirmed through an extension to the study in which the copper(II) content in the LDHs was varied. It was shown that there is an optimum copper(II) loading, above which additional copper(II) is not effectively incorporated in the LDH lattice. Other supports for copper(II) as an oxide were investigated, on the basis that activity was linked to effective dispersion of copper(II) oxide. A series of copper(II) dispersions on zirconia, on silica and on magnesium oxide were prepared and tested. The zirconia-supported catalysts were the most active so work was concentrated on these. Two methods for preparing copper(II) oxide/zirconia were investigated, using a solid state reaction and using a sol-gel process. Catalysts were prepared with molar copper contents of from 2 to 60 mol%. It was possible to see from powder X-ray diffraction that copper(II) was dispersed in the zirconia matrix at levels up to about 20% depending on the synthetic method. And it was shown that base-catalytic activity of these materials correlated with the amount of fully incorporated copper(II). Activities of these were generally higher than the mixed metal oxides made from the LDHs. For comparison, another, different, approach to incorporating basicity in oxide supports was examined, in which alkylamino groups were tethered to silica supports, specifically a mesoporous molecular sieve form of silica, SBA-15. The activity of these materials were compared with those of the copper(II) based catalysts in the Henry reaction between nitromethane and benzaldehyde. An advantage of these catalysts was exploited by coordinating palladium(II) to the amine groups at different levels to impart oxidation catalytic activity. The resultant materials, in which only part of the amine functionality was coordinated by palladium(II), were tested as bifunctional catalysts, for combined oxidation and base catalytic activity, in the two step reaction between benzyl alcohol and nitromethane, which proceeds via an oxidation step to benzaldehyde followed by a base-catalysed step. The overall conclusion was that copper(II) is effective at imparting base catalytic activity to a range of support oxides, and that it does not have significant activity towards oxidation reactions., contrary to some claims in the literature. Oxidation activity can be obtained alongside base activity by preparing bifunctional catalysts but only through a different approach.

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Popa, Tiberiu. „Metal oxide catalysts for green applications“. Laramie, Wyo. : University of Wyoming, 2009. http://proquest.umi.com/pqdweb?did=1955861591&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Gonçalves, Alexandre Amormino Dos Santos. „Development of Nanostructured Ceramic Catalysts Based on Mixed Metal Oxides“. Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1543412496976455.

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Han, Binghong. „Activating oxygen chemistry on metal and metal oxides: design principles of electrochemical catalysts“. Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104100.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2016.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 93-98).
Electrochemical energy storage and conversion devices are important for the application of sustainable clean energies in the next decades. However, the slow kinetics of oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) lead to great energy loss in many electrochemical energy devices, including polymer electrolyte membrane fuel cells (PEMFCs), water splitting electrolyzers, and rechargeable metal-air batteries, which hampers the development of new-energy applications such as electric vehicles. To increase the energy efficiency of ORR and OER processes, various catalysts have been studied for oxygen electrocatalysis, but they are still not active enough or not stable enough in developing commercial friendly electrochemical devices. In this work, systematic studies have been applied on two catalyst systems: Pt-metal (Pt-M) alloys for ORR and perovskite oxides for OER. The combination of electrochemical characterizations with transmission electron microscopy (TEM) techniques provides deeper insights on how the basic physical and chemical properties could influence the stability and activity of the catalysts. For Pt-M ORR catalysts, it is found that using transition metal with more positive dissolution potential or forming protective Pt-rich shell by mild acid treatment can improve their stability in acid electrolyte. While for perovskite oxide OER catalysts, it is found that a closer distance between O 2p-band and Fermi level leads to higher activity but lower stability at pH 7, due to the activation of lattice oxygen sites. Moreover, with the help of environmental TEM techniques, structural oscillations are observed on perovskite oxides in the presence of water and electron radiation, caused by the oxygen evolution after water uptake into the oxide lattice. Such structural oscillation is greatly suppressed if the formation and mobility of lattice oxygen vacancy is hampered. The various new activity and stability descriptors for oxygen electrocatalysis found in this work not only provided practical guidelines for designing new ORR or OER catalysts, but also improved our fundamental understandings of the interactions between catalysts and electrolyte.
by Binghong Han.
Ph. D.

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Motshweni, Jim Sipho. „Synthesis of mixed metal oxides for use as selective oxidation catalysts“. Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/445.

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Brown, Adrian St Clair. „The application of superacidic materials for the oxidation of methane“. Thesis, Nottingham Trent University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312315.

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Kotbagi, T. V. „Synthesis of fine chemicals from renewables using supported metal oxides as catalysts“. Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2013. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2170.

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Messi, C. „Nanostructured catalytic metal oxides supported over oxide supports of various nature : the iron oxide system“. Doctoral thesis, Università degli Studi di Milano, 2008. http://hdl.handle.net/2434/57081.

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Bücher zum Thema "Fluorinated metal oxides catalysts"

Aghabozorg, H. Complex metal oxides as potential oxidation catalysts. Manchester: UMIST, 1997.

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Fierro, J. L. G. Metal Oxides. Taylor & Francis Group, 2019.

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Hargreaves, Justin S. J., und S. David Jackson. Metal Oxide Catalysis. Wiley & Sons, Incorporated, John, 2008.

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Hargreaves, Justin S. J., und S. David Jackson. Metal Oxide Catalysis. Wiley & Sons, Limited, John, 2009.

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Fierro, J. L. G., 1948-, Hrsg. Metal oxides: Chemistry and applications. Boca Raton, FL: Taylor & Francis, 2006.

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Fierro, J. L. G. Metal Oxides: Chemistry and Applications. Taylor & Francis Group, 2005.

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Metal Oxide Catalysis, 2 Volume Set. Wiley & Sons, Limited, John, 2008.

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Thangaraju, Mahadevan. Study of precious metal-oxide based electrocatalysts for the oxidation of methanol. 1996.

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Thangaraju, Mahadevan. Study of precious metal-oxide based electrocatalysts for the oxidation of methanol. 1996.

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Fierro, J. L. G. Metal Oxides: Chemistry and Applications. Taylor & Francis Group, 2005.

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Buchteile zum Thema "Fluorinated metal oxides catalysts"

Zhang, Zhenxin, und Wataru Ueda. „All-Inorganic Zeolitic Octahedral Metal Oxides“. In Crystalline Metal Oxide Catalysts, 123–65. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5013-1_5.

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Holme, Timothy P., Hong Huang und Fritz B. Prinz. „Design of Heterogeneous Catalysts and the Application to the Oxygen Reduction Reaction“. In Thin Film Metal-Oxides, 303–28. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0664-9_10.

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Mousdis, G. A., M. Kompitsas, D. Tsamakis, M. Stamataki, G. Petropoulou und P. Koralli. „Resistivity Sensors of Metal Oxides with Metal Nanoparticles as Catalysts“. In Nanomaterials for Security, 187–99. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7593-9_15.

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Mousdis, G. A., M. Kompitsas, G. Petropoulou und P. Koralli. „Chemoelectrical Gas Sensors of Metal Oxides with and Without Metal Catalysts“. In Advanced Nanomaterials for Detection of CBRN, 135–48. Dordrecht: Springer Netherlands, 2020. http://dx.doi.org/10.1007/978-94-024-2030-2_9.

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Chu, Wenling, Drew Higgins, Zhongwei Chen und Rui Cai. „Non-precious Metal Oxides and Metal Carbides for ORR in Alkaline-Based Fuel Cells“. In Non-Noble Metal Fuel Cell Catalysts, 357–88. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527664900.ch10.

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Ishihara, Akimitsu, Hideto Imai und Ken-ichiro Ota. „Transition Metal Oxides, Carbides, Nitrides, Oxynitrides, and Carbonitrides for O2Reduction Reaction Electrocatalysts for Acid PEM Fuel Cells“. In Non-Noble Metal Fuel Cell Catalysts, 183–204. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527664900.ch5.

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Bentley, J., und J. Graetz. „Application of EELS to Ceramics, Catalysts and Transition Metal Oxides“. In Transmission Electron Energy Loss Spectrometry in Materials Science and The EELS Atlas, 271–316. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527605495.ch8.

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Ono, Yoshio, und Hideshi Hattori. „Preparation and Catalytic Properties of Solid Base Catalysts — I. Metal Oxides“. In Solid Base Catalysis, 69–156. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18339-3_3.

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Levy, Caroline, Masaru Watanabe, Yuichi Aizawa, Hiroshi Inomata und Kiwamu Sue. „Synthesis of Nanophased Metal Oxides in Supercritical Water: Catalysts for Biomass Conversion“. In Progress in Nanotechnology, 217–24. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9780470588260.ch32.

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Buffon, R., M. Leconte, A. Choplin und J. M. Basset. „Reaction of Some Alkylidyne Complexes of Tungsten with Inorganic Oxides: A General Route towards Active Supported W Based Metathesis Catalysts?“ In Transition Metal Carbyne Complexes, 51–53. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1666-4_4.

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Konferenzberichte zum Thema "Fluorinated metal oxides catalysts"

El-Dera, Sandra Erfan, Ahmed Abd El Aziz und Ahmed Abd El Moneim. „Evaluation of the Activity of Metal-Oxides as Anode Catalysts in Direct Methanol Fuel Cell“. In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2012 6th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fuelcell2012-91288.

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In the present work, pure iridium oxide (IrO2), and ternary catalysts (IrSnSb-Oxides and RuIrTi-Oxides) are investigated to be used as anode electrocatalysts in The Direct Methanol Fuel Cells (DMFC). Investigations of Methanol Oxidation and Hydrogen Evolution over the catalysts are measured in sulphuric acid as a supportive electrolyte using cyclic voltammetry technique at room temperature (25°C). A specific comparison between the electrocatalytic activities of IrSnSb-Oxides and RuIrTi-Oxides systems is conducted. A comprehensive examination of IrSnSb-Oxides and RuIrTi-Oxides catalysts containing different fractions of the alloying elements are performed to study the effect of varying Iridium Ir content (%) in IrSnSb-Oxides and Ruthenium Ru content (%) in RuIrTi-Oxides on the catalytic activity of ternary catalysts and on the performance of DMFC. It is observed that the electrocatalytic performance of ternary oxides catalysts is strongly dependent on the Ir and Ru content. The generated IrO2 and 33.36% Ru – 1%Ir – 65.64%Ti – Oxides catalysts prove high stability for oxidation of methanol and more proficient electrochemical activity as an anodic electrocatalyst in DMFC at 25°C. The electrochemical measurements of the Hydrogen Evolution Reaction (HER) for metal oxides show that 46.65%Ir – 40.78%Sn – 12.57%Sb sample and 18.75%Ru – 9.35%Ir – 71.9%Ti sample are the superior hydrogen evolution catalysts at 25°C.

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Rohart, E., S. Verdier, H. Takemori, E. Suda und K. Yokota. „High OSC CeO2/ZrO2 Mixed Oxides Used as Preferred Metal Carriers for Advanced Catalysts“. In SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-1057.

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Fedorova, E. D., L. A. Buluchevskaya, E. A. Buluchevskiy, A. V. Lavrenov und E. R. Saybulina. „Isodewaxing of hydrocarbon biodiesel using catalysts based on zeolites and anion-modified metal oxides“. In 21ST CENTURY: CHEMISTRY TO LIFE. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122929.

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Zou, Hanbo, Shengzhou Chen, Zili Liu und Weiming Lin. „Study on the Catalytic Performance of CuO-CeO2 Catalysts Doped with Transition Metal Oxides for Selective CO Oxidation“. In 2011 International Conference on Intelligent Computation Technology and Automation (ICICTA). IEEE, 2011. http://dx.doi.org/10.1109/icicta.2011.507.

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Zhu, Rongshu, Mingxin Guo und Feng Ouyang. „An Exploratory Study on Simultaneous Removal of Nitrogen Oxides and Soot from Diesel Exhaust Gas: Single Component Metal Oxide Catalysts“. In 2008 2nd International Conference on Bioinformatics and Biomedical Engineering. IEEE, 2008. http://dx.doi.org/10.1109/icbbe.2008.462.

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Wang, Jung-Hui, und Chuin-Tih Yeh. „Washcoating Copper Catalyst With Various Metal Oxides Sol Onto Microchannel Reactor for Steam Reforming of Methanol“. In ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33305.

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Washcoating copper catalyst in the micro-channel reactor for steam reforming of methanol (SRM) is advantageous to get high ratio of surface area to volume. Catalyst was coated using brushing method by making slurry with different metal oxides sol as binder (ceria, zirconia and yttria). In the preparation of catalyst slurry, the solid content, ratio of catalyst to binder, pH value and solvent were investigated. The adhesion of catalyst can be compared by estimating the weight loses of washcoating layer after 130W sonication for 30 min. The crystallite, morphology, reduction temperature and chemical environment of catalysts can be characterized by XRD, SEM, TPR and OTPR. The catalyst coated with various metal oxides sol mixing water/ethanol solvent with a specific solid content and catalyst/binder ratio in the neutral solution exhibits a good adherence with the substrate. The performance of fabricated micro-reformer is investigated in the temperature range 150–300 °C. In GHSV = 60,000 h−1, the conversion reaches 80% at 210 °C, and it corresponded to the generating of hydrogen for power output of 2 W assuming a 50% fuel cell operating efficiency. Furthermore, the fabrication of microchannels reactor connecting high temperature PEMFC is investigated.

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Wang, Tianyou, Shuliang Liu, Hongjun Xu, Xing Li, Maolin Fu, Landong Li und Naijia Guan. „Evaluation of In-Situ Synthesized Monolithic Metal-MFI/Cordierite Catalysts to Remove NOx From Lean Exhaust“. In ASME 2005 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/icef2005-1253.

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In this study, ZSM-5 zeolites were successfully in situ synthesized on the surface of honeycomb cordierite substrate and certified by XRD and SEM techniques. Strong interaction between zeolite and substrate has been found during in-situ synthesis, and hydrothermal stabilities of the zeolites was improved by entailing. The in-situ synthesized monolithic ZSM-5/cordierite showed superior thermal and hydrothermal stabilities. Cu-ZSM-5/cordierite was prepared by ion-exchange and impregnation methods were studied as catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NOx) in a lean-burn gasoline engine. Engine test results show that NOx emission was decreased by reductants of HC and CO in the exhaust gas without any other extra reducing agents. It also exhibited high activities. Using Cu-ZSM-5/cordierite, the maximum NOx conversion efficiency to N2 reached to 64% at the exhaust temperature of 400 °C and the gas hourly space velocity (GHTV) of 25 000/h. Meanwhile, the HC conversion efficiency was about 60%, while CO was little converted. Cu-ZSM-5/cordierite also showed good duration and anti-poison properties. Furthermore, the activated temperature of the Cu-ZSM-5/cordierite was decreased and the NOx conversion was increased via addition of iridium as a modifier.

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Depiak, A., und I. Wierzba. „The Catalytic Oxidation of Heated Lean Homogeneously Premixed Gaseous-Fuel Air Streams“. In ASME 2002 Engineering Technology Conference on Energy. ASMEDC, 2002. http://dx.doi.org/10.1115/etce2002/cae-29065.

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Results are presented of an experimental laboratory investigation of the oxidation reactions of heated low velocity streams of homogeneous lean fuel-air mixtures within a packed bed tubular reactor at atmospheric pressure in the presence of non-noble metal oxides catalysts. The main fuel considered was methane, however, other common gaseous fuels, i.e. propane, carbon monoxide, hydrogen and ethylene were also examined for comparative purposes. It was shown that binary cobalt oxide/chromium oxide catalysts can be effective in the oxidation of very lean fuel-air mixtures. Furthermore, there is an optimum value of their mass ratio that could produce a significant improvement to the low temperature oxidation of the lean mixtures examined and the corresponding resulting emissions.

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Avramenko, Valentin, Vitaly Mayorov, Dmitry Marinin, Alexander Mironenko, Marina Palamarchuk und Valentin Sergienko. „Macroporous Catalysts for Hydrothermal Oxidation of Metallorganic Complexes at Liquid Radioactive Waste Treatment“. In ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2010. http://dx.doi.org/10.1115/icem2010-40186.

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One of the main problems of liquid radioactive waste (LRW) management is concerned with treatment of decontamination waters containing organic ligands. The organic ligands like oxalic, citric and ethylenediaminetetraacetic acids form stable complexes with radionuclides which puts restrictions on application of many technologies of LRW management. One of the ways of destruction of metallorganic complexes consists in using the catalytic oxidation. However, the heterophase catalytic oxidation is rather problematic due to formation of metal oxides on the catalyst surface and calmatation of meso- and micropores. A possible solution of the above problem can be found in synthesis of macroporous catalysts for oxidation having a regular macroporous structure. The present paper describes the template synthesis of macroporous metalloxide catalysts performed with using siloxane-acrylate microemulsions as templates. The method for impregnation of precious metals (PM) particles into the template, which enables one to produce PM nanoparticles of a specific size and immobilize them in the porous structure of the synthesized metalloxide catalysts, is presented. A possible mechanism of the synthesis of macroporous catalysts is suggested and the comparison of the electronic and photon-correlation spectroscopy results obtained at different stages of catalysts synthesis was conducted.

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Rosa, Josimar Souza, Marcos Moresco Smaniotto und Giovani Dambros Telli. „Impacts on combustion from the metal oxide nanoparticles use as an additive in biodiesel: literature review“. In SAE Brasil 2023 Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2023-36-0119.

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<div class="section abstract"><div class="htmlview paragraph">Although pure biodiesel is used in diesel engines, some challenges, such as higher density, lower cetane number, and lower calorific value, prevent it from completely replacing conventional fossil diesel. Therefore, the addition of compounds aimed at improving the biodiesel combustion process or improving its physicochemical properties is a fundamental issue in using them in pure form or in high proportions in engines, thereby maintaining the performance of such equipment. An alternative that has been studied in recent years is the addition of nanoparticles to biodiesel, which act as catalysts in the combustion process. This study examined in detail the influence of nanoadditives on the performance, combustion, and emissions characteristics of the CI engine. Furthermore, it will discuss the challenges and potential future directions in the utilization of nanoparticles to improve the use of biodiesel in CI engines. The reviewed articles show that the addition of nanoparticles to biodiesel can improve the thermal efficiency of the engine, reduce fuel consumption, carbon monoxide, unburned hydrocarbons, and nitrogen oxides (NOX) emissions due to the catalytic effect of metallic oxide nanoparticles. As a result, the activation temperature of carbon combustion is reduced and, therefore, the oxidation rate of hydrocarbons is increased, promoting more complete combustion. Thus, the use of nanoparticle catalysts can be considered a promising method to optimize the performance of compression ignition engines operating on biodiesel.</div></div>

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Berichte der Organisationen zum Thema "Fluorinated metal oxides catalysts"

Akyurtlu, Ates, und Jale F. Akyurtle. INVESTIGATION OF MIXED METAL SORBENT/CATALYSTS FOR THE SIMULTANEOUS REMOVAL OF SULFUR AND NITROGEN OXIDES. Office of Scientific and Technical Information (OSTI), August 2001. http://dx.doi.org/10.2172/789669.

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Akyurtlu, A., und J. F. Akyurtlu. Investigation of mixed metal sorbent/catalysts for the simultaneous removal of sulfur and nitrogen oxides. Office of Scientific and Technical Information (OSTI), März 1999. http://dx.doi.org/10.2172/8818.

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Akyurtlu, Ates, und Jale F. Akyurtlu. INVESTIGATION OF MIXED METAL SORBENT/CATALYSTS FOR THE SIMULTANEOUS REMOVAL OF SULFUR AND NITROGEN OXIDES. Office of Scientific and Technical Information (OSTI), November 1999. http://dx.doi.org/10.2172/834566.

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Ates Akyurtlu und Jale F. Akyurtlu. INVESTIGATION OF MIXED METAL SORBENT/CATALYSTS FOR THE SIMULTANEOUS REMOVAL OF SULFUR AND NITROGEN OXIDES. Office of Scientific and Technical Information (OSTI), April 2000. http://dx.doi.org/10.2172/828034.

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Lai-Sheng Wang. Early Transition Metal Oxides as Catalysts: Crossing Scales from Clusters to Single Crystals to Functioning Materials. Office of Scientific and Technical Information (OSTI), Juli 2009. http://dx.doi.org/10.2172/958303.

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Dr. Ates Akyurtlu und Dr. Jale F. Akyurtlu. Investigation of mixed metal sorbent/catalysts for the simultaneous removal of sulfur and nitrogen oxides. Semiannual report, Apr 1, 1998--Oct 31, 1998. Office of Scientific and Technical Information (OSTI), Oktober 1998. http://dx.doi.org/10.2172/754426.

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