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Dissertations / Theses on the topic 'Hydrolysis of sodium borohydride'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Shang, Yinghong. "Thermodynamic and kinetic study on hydrolysis of concentrated sodium borohydride solution." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/16598.

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The hydrolysis of sodium borohydride (NaBH4) over efficient metal catalysts is a promising approach to hydrogen storage. An alkali such as NaOH is often added to stabilise the system in practical applications. The concentration of the NaBH4 solution should be as high as possible to improve energy density of the system. However, the byproduct sodium metaborate (NaB02) would become saturated and precipitate from the solution when the concentration of sodium borohydride is over a limit, resulting in piping blockage and the decrease of the catalyst efficiency. The theme of this thesis was to inves

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2

Masjedi, Mehdi. "Homogeneous Catalysts For The Hydrolysis Of Sodium Borohydride: Synthesis, Characterization And Catalytic Use." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612290/index.pdf.

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Recent study has shown that ruthenium(III) acetylacetonate acts as a homogeneous catalyst in the hydrolysis of sodium borohydride. When two equivalents of trimethylphosphite per ruthenium is added to the reaction solution containing sodium borohydride and ruthenium(III) acetylacetonate in the mixture of water and tetrahydrofuran, the rate of hydrogen generation is practically stopped (or reduced to the level of self hydrolysis). However, the catalytic hydrogen evolution of sodium borohydride restarts at an unexpectedly high rate in a certain period of time (induction time) after addition of tr

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3

Boran, Asli. "Design Of Prototype Reactor For Hydrogen Production From Sodium Borohydride." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613639/index.pdf.

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Sodium borohydride (NaBH4) offers a simple and safe technology for storage and on demand production of hydrogen being a promising and a feasible method for fuel cell applications. The objectives of the present study are to emphasize the role of sodium borohydride as a part of future hydrogen energy system, to investigate the kinetics of the catalytic hydrolysis reaction of NaBH4 in a batch and flow system with respect to temperature, concentration, catalyst and flow rate for flow reactor by proposing a kinetic model and finally based on kinetic analysis, to design a prototype reactor to meet

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4

Vilarinho, Franco Tatiana. "Stabilité des solutions aqueuses de borohydrure de sodium lors de la génération d'hydrogène par hydrolyse." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10158.

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L’hydrogène en tant que vecteur énergétique reste tributaire, pour un développement à grande échelle, de son stockage et de la facilité de dégagement du combustible stocké. Pour les applications embarquées, portables et stationnaires, aucune technologie de stockage (H2 comprimé, H2 liquide, hydrures métalliques ou chimiques) ne répond aujourd’hui au cahier des charges d’un système de stockage. De nombreuses études se penchent donc à la fois sur l'optimisation des composants et le développement de sources d'énergie miniatures. Dans cette optique, la production d'hydrogène par l'hydrolyse des bo

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5

Zahmakiran, Mehmet. "Synthesis And Characterization Of Ruthenium(0) Metal Nanoparticles As Catalyst In The Hydrolysis Of Sodium Borohydride." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12605966/index.pdf.

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Sodium borohydride is stable in alkaline solution, however, it hydrolyses and generates hydrogen gas in the presence of suitable catalyst. By this way hydrogen can be generated safely for the fuel cells. All of the catalyst having been used in the hydrolysis of sodium borohydride, with one exception, are heterogeneous. The limited surface area of the heterogeneous and therefore, have limited activity because of the surface area. Thus, the use of metal nanoclusters as catalyst with large surface area is expected to provide a potential route to increase the catalytic activity. In this dissertat

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6

Bartkus, Tadas Patrick. "An Analytical Model Based on Experimental Data for the Self-Hydrolysis Kinetics of Aqueous Sodium Borohydride." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1283538978.

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7

Metin, Onder. "Synthesis And Characterization Of Hydrogenphosphate-stabilized Nickel(0) Nanoclusters As Catalyst For The Hydrolysis Of Sodium Borohydride." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607239/index.pdf.

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The development of new storage materials will facilitate the use of hydrogen as a major energy carrier in near future. In hydrogen economy, chemical hydrides such as NaBH4, KBH4, LiH, NaH have been tested as hydrogen storage materials for supplying hydrogen at ambient temperature. Among these chemical hydrides, sodium borohydride seems to be an ideal hydrogen storage material because it is stable under ordinary conditions and liberates hydrogen gas in a safe and controllable way in aqueous solutions. However, self hydrolysis of sodium borohydride is so slow that it requires a suitable catalyst

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8

Kocak, Ebru. "Effect Of Stabilizer On The Catalytic Activity Of Cobalt(0) Nanoclusters Catalyst In The Hydrolysis Of Sodium Borohydride." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12611280/index.pdf.

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The development of new storage materials will facilitate the use of hydrogen as a major energy carrier in near future. Among the chemical hydrides used as hydrogen storage materials for supplying hydrogen at ambient temperature, sodium borohydride seems to be an ideal one because it is stable under ordinary conditions and liberates hydrogen gas in a safe and controllable way in aqueous solutions. However, self hydrolysis of sodium borohydride is so slow that requires a suitable catalyst. This work aims the use of water dispersible cobalt(0) nanoclusters having large portion of atoms on the sur

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9

Demiralp, Tulin. "Testing The Ruthenium(iii) Acetylacetonate And 1,2-bis(diphenylphosphino)ethane System As Homogeneous Catalyst In The Hydrolysis Of Sodium Borohydride." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609539/index.pdf.

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Recent studies have shown that ruthenium(III) acetylacetonate is acting as homogeneous catalyst in the hydrolysis of sodium borohydride. Although trimethlyphosphite is found to be a poison for the catalytic hydrolysis of sodium borohydride, a longer observation of the reaction in the presence of ruthenium(III) acetylacetonate and 2 equivalent trimethylphosphite shows an unexpected enhancement in the catalytic activity after an induction period. The same rate enhancement is observed when 2 equivalent triphenylphosphine is added into the reaction solution. Addition of 1 equivalent 1,2-bis(diphen

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10

Rakap, Murat. "Preparation And Characterization Of Zeolite Confined Cobalt(0) Nanoclusters As Catalyst For Hydrogen Generation From The Hydrolysis Of Sodium Borohydride And Ammonia Borane." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613421/index.pdf.

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Because of the growing concerns over the depletion of fossil fuel supplies, environmental pollution and global warming caused by a steep increase in carbon dioxide and other greenhouse gases in the atmosphere, much attention has been given to the development of renewable energy sources that are the only long-term solution to the energy requirements of the world&rsquo<br>s population, on the way towards a sustainable energy future. Hydrogen has been considered as a clean and environmentally benign new energy carrier for heating, transportation, mechanical power and electricity generation. Howev

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11

Zahmakiran, Mehmet. "The Preparation And Characterization Of Zeolite Framework Stabilized Ruthenium(0) Nanoclusters." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12611764/index.pdf.

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The use of microporous materials with ordered porous structures as the hosts to stabilize metal nanoclusters has attracted particular interest in the catalysis because the pore size restriction could confine the growth of nanoclusters and lead to an increase in the percentage of catalytically active surface atoms. In this dissertation we report the preparation, characterization and the investigation of the catalytic performance of zeolite framework stabilized ruthenium(0) nanoclusters in the hydrolysis of sodium borohydride and the hydrogenation of aromatics. The zeolite framework stabilized r

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12

Metin, Onder. "Synthesis And Characterization Of Water Soluble Polymer Stabilized Transition Metal(0) Nanoclusters As Catalyst In Hydrogen Generation From The Hydrolysis Of Sodium Borohydride And Ammonia Borane." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612717/index.pdf.

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Metal nanoclusters exhibit unique properties which differ from their bulk materials, owing to the quantum size effects. For example, the catalytic activity of transition metal nanoclusters generally increases with decreasing particle size. However, nanoclusters tend to be fairly unstable with respect to the agglomerate into bulk metal in solution and thus special precautions have to be taken to avoid their aggregation or precipitation during the preparation of such nanoclusters in solution. In order to obtain stable nanoclusters dispersed in solution, a stabilizing agent is usually added into

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13

Dinc, Melek. "Water Soluble Polymer Stabilized Iron(0) Nanoclusters: A Cost Effective And Magnetically Recoverable Catalyst In Hydrogen Generation From The Hydrolysis Of Ammonia Borane." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613427/index.pdf.

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The property transition metal nanoclusters are more active catalysts than their bulk counterparts because of increasing proportion of surface atoms with decreasing paricle size. The development of efficient and economical catalysts to further improve the kinetic properties under moderate conditions is therefore important for the practical application of nanoclusters as catalyst in the hydrogen generation from hydrolysis of ammonia borane this. In this regard, the development of active iron catalysts is a desired goal because it is the most ubiquitous of the transition metals, the fourth most p

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14

Keceli, Ezgi. "Ruthenium(iii) Acetylacetonate." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/3/12607230/index.pdf.

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Ruthenium(III) acetylacetonate was employed for the first time as homogeneous catalyst in the hydrolysis of sodium borohydride. Ruthenium(III) acetylacetonate was not reduced by sodium borohydride under the experimental conditions and remains unchanged after the catalysis, as shown by FT-IR and UV-Vis spectroscopic characterization. Poisoning experiments with mercury, carbon disulfide or trimethylphosphite provide compelling evidence that ruthenium(III) acetylacetonate is indeed a homogenous catalyst in the hydrolysis of sodium borohydride. Kinetics of the ruthenium(III) acetylacetonate ca

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15

Chamoun, Rita. "Elaboration de films catalytiques co-alumine par dépôt électrophorétique pour l'hydrolyse du NaBH4 : développement du procédé dans une perspective de valorisation d'argiles naturelles du Liban comme supports de catalyseurs." Thesis, Lyon 1, 2010. http://www.theses.fr/2010LYO10167.

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L’hydrolyse spontanée du NaBH4 en milieu aqueux est une réaction lente nécessitant l’emploi d’un catalyseur pour l’accélérer. Nous présentons ici l’élaboration de catalyseurs Co supporté sur αAl2O3 mis forme de films, plus appropriés pour des applications nécessitant un démarrage/arrêt à la demande de la génération d’H2. Les films sont déposés sur un substrat Cu par dépôt électrophorétique (DEP). Par ailleurs, des catalyseurs Co supporté sur différentes argiles naturelles (Kaolinite, Illite-A et Illite-B) en provenance du Liban ont été élaborés. Le Co a été déposé sur αAl2O3 par six voies diff

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16

Andrieux, Jérome. "Stockage de l'hydrogène dans les borohydrures alcalins : hydrolyse du borohydrure de sodium." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00654299.

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Le contexte environnemental (réchauffement climatique) et économique (épuisement des ressources en énergies fossiles) entraîne une nécessaire mutation du paysage énergétique mondial. L'hydrogène est présenté comme un vecteur d'énergie propre pouvant, par l'intermédiaire d'une pile à combustible, fournir de l'électricité pour diverses applications (nomade, portable, automobile et stationnaire). Cependant, son développement reste tributaire de son mode de stockage. Parmi les composés présentant de bonnes capacités de stockage, le borohydrure de sodium NaBH4 se distingue puisqu'il permet aussi un

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17

Akyol, Emel Özgen Tamerkan. "Synthesis of Magnesium Hydride And Sodium Borohydride At Low Temperatures/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezlerengelli/master/kimya/T000567.pdf.

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18

Merino, Jimenez Irene. "Investigation of the use of sodium borohydride for fuel cells." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/363760/.

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The use of NaBH4 for fuel cells offers a promising alternative to incumbent electrical power generation technologies. The predicted high energy density (9.3 kW h kg-1) of the direct borohydride fuel cell (DBFC) and its capacity to release 8e- per molecule converts it to a potential substitute for the H2/O2 system. Sodium borohydride, with 10.6 wt. % hydrogen content, can also generate H2 gas to be fed into a traditional H2/O2 fuel cell in an indirect borohydride fuel cell (IBFC). However, there are fundamental aspects of the DBFC and the IBFC that need to be addressed to achieve their optimal

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19

Erkan, Serdar. "Development Of 100w Portable Fuel Cell System Working With Sodium Borohydride." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613564/index.pdf.

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Fuel cells are electricity generators which convert chemical energy of hydrogen directly to electricity by means of electrochemical oxidation and reduction reactions. A single proton exchange membrane (PEM) fuel cell can only generate electricity with a potential between 0.5V and 1V. The useful potential can be achieved by stacking cells in series to form a PEM fuel cell stack. There is a potential to utilize 100W class fuel cells. Fuelling is the major problem of the portable fuel cells. The aim of this thesis is to design and manufacture a PEM fuel cell stack which can be used for portable a

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20

Taha, Mutasem O. "Some uses of acyliminium ions in the synthesis of isoquinolones with potential biological activity." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/12608.

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The preparation of a number of 2-substituted homophthalimides through the condensation of homophthalic anhydride with different arylalkyl arnines is reported. The prepared compounds were alkylated at the 4-position to generate 4-mono-, 4,4-disubstituted and 4-spirocyclic homphthalimides, the analogues of which were reported to have interesting biological activity. Regioselective reduction of the 4-substituted derivatives generated the corresponding carbinolamides. Treating the carbinolamides with mineral or Lewis acids generated N-acyliminiurn ions, which were trapped in situ by one of the fol

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21

Afonso, Louis Greg. "Studies of hydrogen storage in the sodium borohydride and magnesium nickel hydride composite system." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/43802.

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Complex metal hydrides typically have high enthalpies which lead to desorption temperatures that are too high for practical use. Thermodynamic destabilization is one method used to lower the enthalpy of decomposition and hence lower the temperature of desorption of a complex metal hydride. A lower temperature (less than 100ºC) would enable waste heat from a PEM(Polymer Electrolyte Membrane) fuel cell to drive the hydrogen desorption reaction. NaBH₄ was destabilized by ball milling NaBH₄ and Mg₂NiH₄ in a 4:5 molar ratio, respectively. Ball milling periods of up to 2 hours did not have an effect

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22

Daigneault, Louis E. "Modelling the kinetics of the enzymatic hydrolysis of sodium carboxymethyl cellulose." Thesis, University of Ottawa (Canada), 1986. http://hdl.handle.net/10393/4908.

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23

Liddy, Kyle Jacob. "Synthesis of 4-iodo-3-(2-iodoaryl) and 4-bromo-3-(2-bromoaryl) sydnones and their Reactions with Sodium Sulfite, Sodium Borohydride, and Iodine Monochloride." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1501499797285277.

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24

Rocha, Daniele Fernanda de Oliveira 1982. "Estudo da redução de iminas." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249529.

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Orientador: Antonio Claudio Herrera Braga<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-12T16:47:01Z (GMT). No. of bitstreams: 1 Rocha_DanieleFernandadeOliveira_M.pdf: 3918609 bytes, checksum: ca79955ba1bba5d8eb4ed332338d0115 (MD5) Previous issue date: 2008<br>Resumo: Neste trabalho foi estudado o comportamento de uma série de iminas estruturalmente análogas quando submetidas à biocatálise com fermento de pão e cenoura. Também foi testado NaBH4 em conjunto com alguns aminoálcoois de diferentes tamanhos, como 1-amino

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25

Eames, Douglas J. "Direct causticizing of sodium carbonate with manganese oxide." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/7026.

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26

Chassery, Aurélien. "Étude expérimentale et modélisation phénoménologique de l’hydrolyse de sodium tritié : influence des conditions opératoires sur la distribution du tritium dans les effluents." Phd thesis, Toulouse, INPT, 2014. http://oatao.univ-toulouse.fr/13934/1/chassery.pdf.

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L’hydrolyse contrôlée et progressive est une des solutions technologiques pour traiter le sodium tritié présent dans divers composants d’un Réacteur à Neutrons Rapides. Une étude expérimentale a été réalisée pour analyser et comprendre les phénomènes physico-chimiques mis en jeu lors de cette hydrolyse, fortement exothermique, et étudier l’influence des paramètres opératoires sur la répartition HT /HTO au sein de l’effluent liquide et de l’effluent gazeux générés. Les deux facteurs prédominants sont l’activité totale du sodium traité et le flux énergétique (J/s) dégagée par la réaction. Un mod

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27

Modenbach, Alicia. "Sodium hydroxide pretreatment of corn stover and subsequent enzymatic hydrolysis: An investigation of yields, kinetic modeling and glucose recovery." UKnowledge, 2013. http://uknowledge.uky.edu/bae_etds/17.

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Many aspects associated with conversion of lignocellulose to biofuels and other valuable products have been investigated to develop the most effective processes for biorefineries. The goal of this research was to improve the efficiency and effectiveness of the lignocellulose conversion process by achieving a more basic understanding of pretreatment and enzymatic hydrolysis at high solids, including kinetic modeling and separation and recovery of glucose. Effects of NaOH pretreatment conditions on saccharide yields from enzymatic hydrolysis were characterized in low- and high-solids systems. Fa

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28

Wang, Yan. "Pretreatment and Enzymatic Treatment of Spruce : A functional designed wood components separation for a future biorefinery." Doctoral thesis, KTH, Träkemi och massateknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150395.

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The three main components of wood, namely, cellulose, hemicellulose, and lignin, can be used in various areas. However, since lignin covalently crosslinks with wood polysaccharides creating networks that is an obstacle for extraction, direct extraction of different wood components in high yield is not an easy matter. One potential approach to overcome such obstacles is to treat the wood with specific enzymes that degrade the networks by specific catalysis. However, the structure of wood is so compact that the penetration of the wood fibers by large enzyme molecules is hindered. Thus, the pretr

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29

Delk, Roger Dale. "The effects of guanidinium chloride, urea and sodium dodecyl sulfate on the endoproteinase Glu-C- catalyzed hydrolysis of N-t-BOC-L-glutamic acid-gas-phenyl ester." Virtual Press, 1994. http://liblink.bsu.edu/uhtbin/catkey/897494.

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Endoproteinase Glu-C (EPGIu-C, EC 3.4.21.19), an enzyme isolated from the bacteria Staphylococcus aureus, has been found to cleave specifically at the carboxyl-terminal side of glutamyl and aspartyl peptide bonds. EPGIu-C has been reported to be stable and active in the presence of common denaturants such as guanidinium chloride, urea and sodium dodecyl sulfate (Drapeau, G.R. (1977) Methods in Enzymology, 47:189-191). In order assess the denaturant stability and activity of EPGIu-C, the effect of three common protein denaturants, guanidinium chloride, urea, and sodium dodecyl sulfate (SDS) on

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30

Wang, Ying. "Cellulose fiber dissolution in sodium hydroxide solution at low temperature dissolution kinetics and solubility improvement /." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26632.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Deng, Yulin; Committee Member: Banerjee, Sujit; Committee Member: Frederick, James; Committee Member: Hsieh, Jeffery; Committee Member: Ragauskas, Arthur J.. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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31

Yovanovich, Marcos. "Oxidação eletroquímica do ácido fórmico em eletrólito ácido e básico utilizando eletrocatalisadores PtBi/C e PdBi/C preparados pelo método de redução via borohidreto de sódio adição rápida." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-22082016-155447/.

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PtBi/C e PdBi/C foram preparados em diferentes razões atômicas (100:0, 90:10, 80:20, 70:30, 60:40 e 50:50) pelo método de redução via borohidreto de sódio (com adição total da solução de borohidreto em uma única etapa) utilizando H2PtCl6.6H2O, Pd(NO3)2, (BiNO3)3.5H2O como fonte de metais, Vulcan® (XC72-Cabot) como suporte de carbono e com uma carga metálica correspondente a 20% em massa. Os eletrocatalisadores obtidos foram caracterizados por difração de raios-X (DRX), microscopia eletrônica de transmissão (MET) e voltametria cíclica (VC). A atividade dos diferentes materiais preparados para a

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Rahman, Hafizur. "Modifying kraft pulping to produce a softwood pulp requiring less energy in tissue paper production." Licentiate thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-32833.

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Modification of softwood kraft pulp by the addition of either polysulfide (PS) or sodium borohydride (NaBH4) has been shown to increase the pulp yield due to a higher retention of glucomannan. The pulps with higher yield gave a paper with higher tensile index than reference pulp, especially at lower degrees of refining. The higher yield pulps also showed a greater porosity of the fibre wall, indicating an increase in the swelling potential of the fibres. This can lead to increased fibre flexibility and increased joint strength between the fibres and to the higher handsheet tensile index. Howe

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Hannauer, Julien. "Stockage solide et génération d’hydrogène : du borohydrure de sodium NaBH4 à l’hydrazine borane N2H4BH3 : catalyse, cinétique et mécanismes." Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10349.

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Parmi les procédés de stockage d’hydrogène étudiés actuellement, le stockage solide de l’hydrogène dans les hydrures chimiques, associée à sa génération par une réaction de solvolyse, est une technologie prometteuse. La première partie de cette thèse s’articule donc autour de l’étude de la solvolyse de deux composés étudiés ces dernières années, le borohydrure de sodium NaBH4 et l’ammoniaborane NH3BH3. Le dégagement contrôlé d’hydrogène peut alors se faire par des réactions d’hydrolyse. La comparaison de la cinétique de la réaction d’hydrolyse du NaBH4 avec celle de la méthanolyse du NaBH4 nou

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34

Kwon, Beatsam. "Catalytic reduction of organic pollutants using supported metal nanoparticles." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23190/.

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Metal nanoparticle catalysts have in the last decades been extensively researched for their enhanced performance compared to their bulk counterpart. Properties of nanoparticles can be controlled by modifying their size and shape as well as adding a support and stabilizing agent. In this study, preformed colloidal gold nanoparticles supported on activated carbon were tested on the reduction of 4-nitrophenol by NaBH4, a model reaction for evaluating catalytic activity of metal nanoparticles and one with high significance in the remediation of industrial wastewaters. Methods of wastewater remedia

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35

Kostka, Johannes. "Wasserstoffgenerator-Systeme auf Basis chemischer Hydride zur Versorgung von PEM-Brennstoffzellen im Kleinleistungsbereich." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2012. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-100204.

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Drei Wasserstoffgenerator-Systeme (WGS) auf Basis chemischer Hydride wurden in dieser Arbeit als Labormuster ausgelegt, gefertigt und in ihren Betriebseigenschaften analysiert. Es wurden ein 20 W-WGS und zwei 100 W-WGS untersucht. Als chemische Hydride wurden Amminboran und Natriumborhydrid ausgewählt. Aufgrund ihrer vergleichsweise einfachen Lagerfähigkeit, ihren moderaten Freisetzungsbedingungen und ihrer volumetrisch wie gravimetrisch hohen Wasserstoffdichten erschienen sie in besonderer Weise geeignet für Wasserstoffgeneratoren im Kleinleistungsbereich. Zwar zeigen diese chemischen Hydride

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36

Nandenha, Júlio. "Estudo da oxidação eletroquímica do ácido fórmico utilizando eletrocatalisadores Pd/C-Sb2O5.SnO2, PdAu/C-Sb2O5.SnO2, PdIr/C-Sb2O5.SnO2 e PdAulr/C-Sb2O5.SnO2 preparados via redução por borohidreto de sódio." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-29072016-133123/.

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Os eletrocatalisadores Pd/C, Pd/C-15%ATO, PdAu/C-15%ATO (90:10, 70:30 e 50:50), PdIr/C-15%ATO (90:10, 70:30 e 50:50) e PdAuIr/C-15%ATO (90:5:5, 70:20:10 e 50:45:5) foram preparados pelo método de redução por borohidreto de sódio. Esses eletrocatalisadores foram caracterizados por espectroscopia de energia dispersiva de raios X (EDX), difração de raios X (DRX) e microscopia eletrônica de transmissão (MET), enquanto que as atividades eletrocatalíticas para a oxidação eletroquímica do ácido fórmico em meios ácido e alcalino foram investigadas por voltametria cíclica, cronoamperometria e experimen

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Macedo, Luciene Fagundes Lauer. "Remoção de mercúrio e arsênio em cação-azul, Prionace glauca." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/9/9131/tde-19012011-102635/.

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Os cações são importantes recursos pesqueiros que podem apresentar concentrações de mercúrio (Hg) e arsênio (As) muitas vezes acima do limite de tolerância, o que os tornam impróprios como alimento. No meio aquático estes contaminantes são convertidos em espécies orgânicas, em especial metilmercúrio (MeHg) e arsenobetaína (AB), respectivamente. O MeHg é neurotóxico, sendo o sistema nervoso em desenvolvimento o mais susceptível. A AB é pouco tóxica, no entanto, o As inorgânico está envolvido em processos de estresse oxidativo, mutagênese e principalmente carcinogênese. Neste trabalho, foi avali

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Fournel, Jean-Louis. "Synthèse et étude de nouveaux agonistes dopaminergiques : les amino hydroxy tetrahydro quinoléines." Rouen, 1986. http://www.theses.fr/1986ROUES029.

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Synthèse d'hydroxy- ou dihydroxy amino-3 tetrahydro-1,2,3,4 quinoléines par réduction par NABH4 ou par hydrogénations sur palladium d'amino-3 quinoléines ; études de relation structure activité ; calculs MNDO et CNDO

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Huang, Yu-Ying, and 黃鈺媖. "Study of catalytic high hydrolysis of sodium borohydride by foam catalyst." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/73001229303931563190.

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碩士<br>元智大學<br>機械工程學系<br>99<br>A new reactor had been designed in this reaserch. Flowing with high purity sodium borohydride solution and reactive with Ru/Ni catalyst, the reactor can produce a large number of high purity hydrogen. According to hydrogen is convenience and has high stability, we use different weight percents of sodium borohydride and sodium hydroxide for testing. In every experiment, we choose a best data of producing hydrogen into the continually hydrogen hydrolysis experiment. The research uses different solution inputs for single piece and each experiment capacity based on t

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Lai, Yao-sheng, and 賴耀生. "Hydrogen production from hydrolysis of sodium borohydride using modified CoB catalysts." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/89059886059999622590.

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碩士<br>國立中央大學<br>化學工程與材料工程研究所<br>96<br>Amorphous CoB catalyst was prepared by cobalt acetate using sodium borohydride as the reducing agent in this research. The main reaction was hydrolysis of sodium borohydride solution. Different additives were added into CoB to modify its physical and chemical properties in favor of better hydrogen generation rate. The series of modified CoB catalysts were characterized by X-ray diffraction (XRD), BET (Brunauer-Emmett-Teller), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The catalytic activity of CoB (2230 ml/min•g) wa

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Huang, Zhen-Ming, and 黃振銘. "Study of catalytic hydrolysis of sodium borohydride by Ru/Ni foam catalyst." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/01121293766377243522.

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碩士<br>元智大學<br>機械工程學系<br>98<br>High purity hydrogen generated by hydrolysis of sodium borohydride can be used as the fuel of PEM fuel cell and other portable device. As its high hydrogen storage capacity, controllable reaction and mild condition, hydrogen generation by catalytic hydrolysis of chemical hydride, such as sodium borohydride, has been the major focus of researches. On the threshold of the controllable of hydrogen generated by hydrolysis of sodium borohydride, the catalyst for hydrolysis of hydrogen generation is studied. First, applying chemical plating, Ru/Ni foam catalyst was prep

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Pan, Chuan-Yi, and 潘泉亦. "Effects of Co-B catalysts synthesis conditions on sodium borohydride hydrolysis reactors design." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/02431300131127318413.

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碩士<br>淡江大學<br>化學工程與材料工程學系博士班<br>101<br>The objective of this work is to study the effect of various Co-B catalyst synthesis conditions on the catalyst surface morphology and kinetic parameters. The Co/B catalyst was synthesized on IR-120/TP-207 resin surface by using ion exchange and chemical reduction method using NaBH4 as a reduction agent. The reduction conditions which were investigated here were: reduction temperature, NaBH4 concentration, pH value, NaBH4 adding flow rate and different types of resins. The result shows reduction temperature gives the most dramatic effect on surface morpho

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Cheng, Ya-Ling, and 鄭雅玲. "Design and Control of a Hydrogen Generation System using the Sodium Borohydride Hydrolysis Reaction." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17527806323206414605.

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碩士<br>臺灣大學<br>化學工程學研究所<br>98<br>NaBH4 hydrolysis for on-board hydrogen generation has received much attention recently due to its higher theoretical energy capacity and zero emissions. In this work, three different operating modes (adiabatic, isothermal, Partially-insulated) of a continuous hydrogen generation system using the NaBH4 hydrolysis reaction are explored. Partially-insulated operation is recommended for this system since it has a higher outlet temperature and lower temperature distribution in reactor, which both mitigate the NaBO2 precipitation problem so that a larger energy densit

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Park, Sunyoung Urquidi-MacDonald Mirna Demirel Melik C. "Catalytic aspects of non-noble metals on hydrogen generation from hydrolysis of sodium borohydride." 2008. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3053/index.html.

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Liao, Wei-Yu, and 廖偉宇. "Dynamic characteristic study of solid sodium borohydride tablets hydrolysis systems with stable hydrogen release rate." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/53906193833551301128.

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碩士<br>淡江大學<br>化學工程與材料工程學系碩士班<br>100<br>In this work, sodium borohydride hydrolysis systems for hydrogen generation were set-up and used to find the reaction kinetic model and kinetic parameters of Ru/Al2O3 catalyst. In order to efficiently enhance the hydrogen storage capacity of the solid sodium borohydride hydrolysis systems, a mathematical model was built and used to analyst and find out the dominant variables of the process. Water was injected by a rotary pump and dispersed via a porous stainless steel sheet into the surface of the NaBH4 tablet/Ru/Al2O3 with a 1.5 cm diameter and 0.2 cm th

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Nunes, Hélder Xavier Teixeira. "Hydrogen generation from catalytic hydrolysis of sodium borohydride on a mini-reactor for portable applications." Dissertação, 2014. https://repositorio-aberto.up.pt/handle/10216/89198.

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Nunes, Hélder Xavier Teixeira. "Hydrogen generation from catalytic hydrolysis of sodium borohydride on a mini-reactor for portable applications." Master's thesis, 2014. https://repositorio-aberto.up.pt/handle/10216/89198.

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Valadão, Emília Isabel de Castro e. Câmara Freitas. "Hydrogen generation from Sodium Borohydride - The effect of Ni-Ru supported catalyst in the hydrolysis reaction." Dissertação, 2018. https://hdl.handle.net/10216/111385.

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Valadão, Emília Isabel de Castro e. Câmara Freitas. "Hydrogen generation from Sodium Borohydride - The effect of Ni-Ru supported catalyst in the hydrolysis reaction." Master's thesis, 2018. https://hdl.handle.net/10216/111385.

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Kuo, Heng-Chia, and 郭恆嘉. "Synthesis and Investigation of Nano-sized Platinum/Metal Oxide Catalystin Hydrogen Generation from Sodium-borohydride Solution Hydrolysis." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/62329094943028898607.

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碩士<br>國立臺灣大學<br>化學研究所<br>96<br>Hydrogen energy is being considered as an alternative energy source of the future because of its advantages in overcoming the ongoing energy crisis. A hydrogen economy is proposed to solve the growing shortage of easily obtainable fossil fuel, and global warming due to the emission of greenhouse gases to the atmosphere. The most common challenge for hydrogen fuel economy is the storage of hydrogen and chemical hydrides are the best substitute of hydrogen storage system. One of the most commonly used metal hydride is sodium borohydride, which has a storage density

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