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Artigos de revistas sobre o tema "Borohydride oxidation reaction (BOR)"

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Publicado: 29 de março de 2025

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1

Belhaj, Ines, Alexander Becker, Filipe M. B. Gusmão, Biljana Šljukić, Miguel Chaves, Salete S. Balula, Luís Cunha Silva e Diogo M. F. Santos. "Au-Based MOFs as Anodic Electrocatalysts for Direct Borohydride Fuel Cells". ECS Meeting Abstracts MA2023-02, n.º 41 (22 de dezembro de 2023): 2053. http://dx.doi.org/10.1149/ma2023-02412053mtgabs.

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Researchers are exploring direct liquid fuel cells (DLFCs) as alternatives to proton-exchange membrane fuel cells because of their higher energy density and ease of storing and transporting the fuel. Direct borohydride fuel cells (DBFCs) are of particular interest as they offer a sustainable energy source with their high-power density output and the use of a highly alkaline NaBH4 medium [1]. Ensuring efficient and cost-effective catalysts for DBFCs is crucial for their commercial viability. Metal-organic frameworks (MOFs) have demonstrated significant potential as anodic electrocatalysts for BOR in DBFCs [2]. However, research should explore various modifications to MOFs, such as the incorporation of alternative metal ions or functional groups, to improve their catalytic efficiency and reduce cost. This study evaluated the performance of newly developed MOF-based electrocatalysts for DBFCs. Specifically, six MOF-based materials were synthesized and analyzed for their ability to facilitate borohydride oxidation (BOR) using cyclic voltammetry and chronoamperometry in alkaline media. MIL-101_Au@NH2 and MOF-808_Au@NH2 were found to be highly effective for BOR. The kinetic parameters for BOR with MOF-based electrocatalysts, including activation energy, reaction order, exchanged electrons, and anodic charge transfer coefficient, were determined. The activation energy for BOR was found to be 13.6 kJ mol−1 and 15.3 kJ mol−1 for MIL-101_Au@NH2 and MOF-808_Au@NH2, respectively. The number of transferred electrons, n, was found to be 7.0 and 3.1 for MIL-101_Au@NH2 and MOF-808_Au@NH2, respectively. This study demonstrates that MOF-based electrocatalysts can enhance DBFCs' performance, while offering insight into the potential usage of MOFs in other fuel cell technologies. [1] B. Šljukić, D.M.F. Santos, "Direct borohydride fuel cells", in: "Direct Liquid Fuel Cells: Fundamentals, Advances, and Future", 1st ed., R.G. Akay, A.B. Yurtcan (eds.), Academic Press, USA, 203-232 (2021) [2] G. Backovic, B. Šljukić, G.S. Kanberoglu, M. Yurderi, A. Bulut, M. Zahmakiran, D.M.F. Santos, Ruthenium (0) nanoparticles stabilized by the metal-organic framework as an efficient electrocatalyst for borohydride oxidation reaction, International Journal of Hydrogen Energy, 45, 27056-27066 (2020).
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2

Milikić, Jadranka, Raisa C. P. Oliveira, Andres Tapia, Diogo M. F. Santos, Nikola Zdolšek, Tatjana Trtić-Petrović, Milan Vraneš e Biljana Šljukić. "Ionic Liquid-Derived Carbon-Supported Metal Electrocatalysts as Anodes in Direct Borohydride-Peroxide Fuel Cells". Catalysts 11, n.º 5 (14 de maio de 2021): 632. http://dx.doi.org/10.3390/catal11050632.

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Three different carbon-supported metal (gold, platinum, nickel) nanoparticle (M/c-IL) electrocatalysts are prepared by template-free carbonization of the corresponding ionic liquids, namely [Hmim][AuCl4], [Hmim]2[PtCl4], and [C16mim]2[NiCl4], as confirmed by X-ray diffraction analysis, scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy and Raman spectroscopy. The electrochemical investigation of borohydride oxidation reaction (BOR) at the three electrocatalysts by cyclic voltammetry reveals different behavior for each material. BOR is found to be a first-order reaction at the three electrocatalysts, with an apparent activation energy of 10.6 and 13.8 kJ mol−1 for Pt/c-IL and Au/c-IL electrocatalysts, respectively. A number of exchanged electrons of 5.0, 2.4, and 2.0 is obtained for BOR at Pt/c-IL, Au/c-IL, and Ni/c-IL electrodes, respectively. Direct borohydride-peroxide fuel cell (DBPFC) tests done at temperatures in the 25–65 °C range show ca. four times higher power density when using a Pt/c-IL anode than with an Au/c-IL anode. Peak power densities of 40.6 and 120.5 mW cm−2 are achieved at 25 and 65 °C, respectively, for DBPFC with a Pt/c-IL anode electrocatalyst.
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3

Molina Concha, M. Belen, KÊnia Freitas, Aniélli Martini Pasqualeti, Marian Chatenet, Fabio H. B. Lima e Edson A. Ticianelli. "Borohydride Oxidation on Platinum Electrodes - Is Platinum Really a Faradaic Inefficient BOR Electrocatalyst". ECS Transactions 41, n.º 1 (16 de dezembro de 2019): 1719–27. http://dx.doi.org/10.1149/1.3635703.

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4

Milikić, Jadranka, Kristina Radinović e Biljana Šljukić. "AuAg/rGO electrodes for borohydride oxidation". Tehnika 79, n.º 5 (2024): 515–19. http://dx.doi.org/10.5937/tehnika2405515m.

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Gold and silver nanoparticles in different atomic ratios deposited on reduced graphene oxide (AuAg/rGO-1, AuAg/rGO-2, and AuAg/rGO-3) were tested for the borohydride oxidation reaction in an alkaline medium. The morphology, structure, and composition of AuAg/rGO electrodes were investigated by transmission electron microscopy (TEM) and scanning electron microscopy with integrated energy dispersive spectroscopy (SEM-EDS). The TEM analysis showed that the most of gold and silver particles (more than 80%) are up to 9 nm in size, while slightly larger particles represent less than 5%. SEM-EDS showed a similar morphology, and the composition of three AuAg/rGO electrodes was determined. AuAg/rGO-1 and AuAg/rGO-2 electrodes showed similar, while AuAg/rGO-3 electrodes demonstrated slightly lower electrocatalytic activity for borohydride oxidation. The studied electrodes were observed to be active for the borohydride hydrolysis as well, which is expected based on literature data. AuAg/rGO certainly represent potential anode materials for application in direct borohydride fuel cells.
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5

Milikić, Jadranka, Marta Martins, Ana S. Dobrota, Gamze Bozkurt, Gulin S. P. Soylu, Ayşe B. Yurtcan, Natalia V. Skorodumova, Igor A. Pašti, Biljana Šljukić e Diogo M. F. Santos. "A Pt/MnV2O6 nanocomposite for the borohydride oxidation reaction". Journal of Energy Chemistry 55 (abril de 2021): 428–36. http://dx.doi.org/10.1016/j.jechem.2020.07.029.

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6

ElSheikh, Ahmed, Gordana Backović, Raisa Oliveira, César Sequeira, James McGregor, Biljana Šljukić e Diogo Santos. "Carbon-Supported Trimetallic Catalysts (PdAuNi/C) for Borohydride Oxidation Reaction". Nanomaterials 11, n.º 6 (29 de maio de 2021): 1441. http://dx.doi.org/10.3390/nano11061441.

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The synthesis of palladium-based trimetallic catalysts via a facile and scalable synthesis procedure was shown to yield highly promising materials for borohydride-based fuel cells, which are attractive for use in compact environments. This, thereby, provides a route to more environmentally friendly energy storage and generation systems. Carbon-supported trimetallic catalysts were herein prepared by three different routes: using a NaBH4-ethylene glycol complex (PdAuNi/CSBEG), a NaBH4-2-propanol complex (PdAuNi/CSBIPA), and a three-step route (PdAuNi/C3-step). Notably, PdAuNi/CSBIPA yielded highly dispersed trimetallic alloy particles, as determined by XRD, EDX, ICP-OES, XPS, and TEM. The activity of the catalysts for borohydride oxidation reaction was assessed by cyclic voltammetry and RDE-based procedures, with results referenced to a Pd/C catalyst. A number of exchanged electrons close to eight was obtained for PdAuNi/C3-step and PdAuNi/CSBIPA (7.4 and 7.1, respectively), while the others, PdAuNi/CSBEG and Pd/CSBIPA, presented lower values, 2.8 and 1.2, respectively. A direct borohydride-peroxide fuel cell employing PdAuNi/CSBIPA catalyst in the anode attained a power density of 47.5 mW cm−2 at room temperature, while the elevation of temperature to 75 °C led to an approximately four-fold increase in power density to 175 mW cm−2. Trimetallic catalysts prepared via this synthesis route have significant potential for future development.
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7

Duan, Dong Hong, Yi Fang Zhao, Shi Bin Liu e Ai Lian Wu. "Electrochemical Oxidation of Borohydride on Cu Electrode". Advanced Materials Research 347-353 (outubro de 2011): 3264–67. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.3264.

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The electrochemical behavior of BH4- on Cu electrode in 1M NaOH was investigated by cyclic voltammetry(CV) in the potential range of -1.2V to 0.4V versus Hg/HgO. The CV results show that Cu electrode has obvious catalytic activities to the BH4- hydrolysis which belongs to ‘catalytic’ electrode materials. The BH4- electro-oxidation process on Cu is complex and it could associate with the BH4- hydrolysis reaction, followed by oxidation of the intermediate H, then, the intermediate product (e.g. BH3OH−) oxidized, and direct oxidation of BH4- at more positive potentials.
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8

Milikić, Jadranka, Raisa C. P. Oliveira, Ivan Stoševski, Jugoslav Krstić, Radmila Hercigonja, Šćepan Miljanić, Diogo M. F. Santos e Biljana Šljukić. "Evaluation of silver-incorporating zeolites as bifunctional electrocatalysts for direct borohydride fuel cells". New Journal of Chemistry 43, n.º 36 (2019): 14270–80. http://dx.doi.org/10.1039/c9nj02148e.

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9

Concha, B. Molina, M. Chatenet, C. Coutanceau e F. Hahn. "In situ infrared (FTIR) study of the borohydride oxidation reaction". Electrochemistry Communications 11, n.º 1 (janeiro de 2009): 223–26. http://dx.doi.org/10.1016/j.elecom.2008.11.018.

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10

Fu, Geng-Tao, Rui Wu, Chang Liu, Jun Lin, Dong-Mei Sun e Ya-Wen Tang. "Arginine-assisted synthesis of palladium nanochain networks and their enhanced electrocatalytic activity for borohydride oxidation". RSC Advances 5, n.º 23 (2015): 18111–15. http://dx.doi.org/10.1039/c5ra01009h.

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Three-dimensional Pd nanochain networks (Pd-NCNs) were prepared by an arginine-assisted self-assembly process, exhibiting excellent electrocatalytic performance towards the borohydride oxidation reaction.
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11

Yi, Lanhua, Yuan Meng, Shaobo Yang, Junjie Fei, Yonglan Ding, Xianyou Wang e Yebo Lu. "N-Doped carbon-supported Au-modified NiFe alloy nanoparticle composite catalysts for BH4− electrooxidation". New Journal of Chemistry 44, n.º 17 (2020): 6940–46. http://dx.doi.org/10.1039/d0nj00557f.

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A nitrogen-doped carbon-supported Au-modified NiFe alloy nanoparticle composite catalyst (Au/NiFe/N–C) has been prepared by a simple method and used as an electrocatalyst for the BH4− oxidation reaction (BOR).
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12

Braesch, Guillaume, Alexandr Oshchepkov, Antoine Bonnefont, Gael Maranzana, Gholamreza Rostamikia, Michael John Janik, Elena Savinova e Marian Chatenet. "(Invited) Electrodeposited Ni-Based Electrodes for High-Performance Borohydride Oxidation Reaction". ECS Meeting Abstracts MA2021-01, n.º 47 (30 de maio de 2021): 1916. http://dx.doi.org/10.1149/ma2021-01471916mtgabs.

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13

Paschoalino, Waldemir J., Stephen J. Thompson, Andrea E. Russell e Edson A. Ticianelli. "The Borohydride Oxidation Reaction on La-Ni-Based Hydrogen-Storage Alloys". ChemPhysChem 15, n.º 10 (2 de abril de 2014): 2170–76. http://dx.doi.org/10.1002/cphc.201400094.

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14

Ahumada, Guillermo, Malin Lill, Julius Kuzmin, Ellymay Goossens, Astrid Steffensen e Helena Lundberg. "Tetrabutylammonium Borohydride: A Sacrificial Reductant in Organic Electrosynthesis". ECS Meeting Abstracts MA2023-02, n.º 53 (22 de dezembro de 2023): 3368. http://dx.doi.org/10.1149/ma2023-02533368mtgabs.

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In this work, tetrabutylammonium borohydride (TBAB) is investigated as a terminal reductant in reductive organic electrosynthesis as replacement for sacrificial anodes. Sacrificial anodes are typically based on easily oxidized metals, such as Mg, Zn, or Al, and are consumed during the reaction, resulting in stoichiometric metal waste. In contrast, oxidation of TBAB enables the use of inert anodes and results in anodic H2 formation, effectively serving as the inverse of cathodic proton reduction. Our results indicate that TBAB oxidation at carbon-based electrodes can replace the use of sacrificial anodes in several organic electrosynthetic reactions, including Birch reduction, hydrodesulfurization of thioethers, hydrodeoxygenation of alcohols1, and cross-electrophile couplings. References Villo, P.; Lill, M.; Alsaman, Z.; Soto Kronberg, A.; Chu, V.; Ahumada, G.; Agarwala, H.; Ahlquist, M.; Lundberg, H. Electroreductive Deoxygenative C–H and C–C Bond Formation from Non-Derivatized Alcohols Fueled by Borohydride Oxidation. ChemElectroChem. 2023, accepted for publication (a previous version can be found in ChemRxiv, DOI: 10.26434/chemrxiv-2023-tw9l1-v2.) Figure 1
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15

He, Nan, Chuanguang Qin, Rumin Wang, Shuhui Ma, Yi Wang e Tao Qi. "Electro-catalysis of carbon black or titanium sub-oxide supported Pd–Gd towards formic acid electro-oxidation". RSC Advances 6, n.º 73 (2016): 68989–96. http://dx.doi.org/10.1039/c6ra13097f.

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Carbon black supported Pd–Gd catalysts (Pd–xGd/C, x is weight percent in catalyst) with different amounts of Gd were prepared by a simultaneous reduction reaction with sodium borohydride in aqueous solution.
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16

Sofian, Muhammad, Fatima Nasim, Hassan Ali e Muhammad Arif Nadeem. "Pronounced effect of yttrium oxide on the activity of Pd/rGO electrocatalyst for formic acid oxidation reaction". RSC Advances 13, n.º 21 (2023): 14306–16. http://dx.doi.org/10.1039/d3ra01929b.

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17

Hjelm, Rachel Marielle Emily, Yannick Garsany, Clémence Lafforgue, Marian Chatenet e Karen Swider-Lyons. "Improvement of the Borohydride Oxidation Reaction by Electrocatalysis on Pt/[TaOPO4/VC]". ECS Transactions 86, n.º 13 (23 de julho de 2018): 659–70. http://dx.doi.org/10.1149/08613.0659ecst.

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18

Wang, Kangli, Juntao Lu e Lin Zhuang. "A Current−Decomposition Study of the Borohydride Oxidation Reaction at Ni Electrodes". Journal of Physical Chemistry C 111, n.º 20 (maio de 2007): 7456–62. http://dx.doi.org/10.1021/jp0710483.

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19

Milikić, Jadranka, Una Stamenović, Vesna Vodnik, Mojca Otoničar, Srečo Škapin e Biljana Šljukić. "Combining silver, polyaniline and polyvinylpyrrolidone for efficient electrocatalysis of borohydride oxidation reaction". Molecular Catalysis 547 (agosto de 2023): 113310. http://dx.doi.org/10.1016/j.mcat.2023.113310.

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20

Pouzar, Vladimír, Tereza Slavíková e Ivan Černý. "Synthesis of (19E)-3β,7β-Dihydroxy-17-oxoandrost-5-en-19-al 19-(O-Carboxymethyl)oxime, New Hapten for 7β-Hydroxydehydroepiandrosterone (3β,7β-Dihydroxyandrost-5-en-17-one)". Collection of Czechoslovak Chemical Communications 62, n.º 1 (1997): 109–23. http://dx.doi.org/10.1135/cccc19970109.

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(19E)-3β,7β-Dihydroxy-17-oxoandrost-5-en-19-al 19-(O-carboxymethyl)oxime (26) was prepared in 15 steps from 17-oxoandrost-5-en-3β-yl benzoate (2, DHEA benzoate). Protection of position 17 by a borohydride reduction and acetylation, subsequent functionalization of position 19 by hypoiodite reaction, oxidation to 19-aldehyde and oximation gave successively (19E)-19-oxoandrost-5-ene-3β,17β-diyl 17-acetate 3-benzoate 19-(O-carboxymethyl)oxime methyl ester (10). Then 7-keto group was introduced by allylic oxidation with chromium(VI) oxide-3,5-dimethylpyrazole complex and stereoselectively reduced by borohydride in the presence of cerium(III) ions into 7β-hydroxy group. After protection as 7-isobutyrate the acetate at position 17 was removed and oxidation recovered 17-ketone. Final deprotection revealed both hydroxyl and carboxyl groups, giving desired 19-CMO 7β-hydroxy DHEA designed as hapten for immunassays.
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21

Rostami, Jowan, Aji P. Mathew e Ulrica Edlund. "Zwitterionic Acetylated Cellulose Nanofibrils". Molecules 24, n.º 17 (29 de agosto de 2019): 3147. http://dx.doi.org/10.3390/molecules24173147.

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A strategy is devised to synthesize zwitterionic acetylated cellulose nanofibrils (CNF). The strategy included acetylation, periodate oxidation, Schiff base reaction, borohydride reduction, and a quaternary ammonium reaction. Acetylation was performed in glacial acetic acid with a short reaction time of 90 min, yielding, on average, mono-acetylated CNF with hydroxyl groups available for further modification. The products from each step were characterized by FTIR spectroscopy, ζ-potential, SEM-EDS, AFM, and titration to track and verify the structural changes along the sequential modification route.
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22

Concha, B. Molina, M. Chatenet, F. Maillard, E. A. Ticianelli, F. H. B. Lima e R. B. de Lima. "In situ infrared (FTIR) study of the mechanism of the borohydride oxidation reaction". Physical Chemistry Chemical Physics 12, n.º 37 (2010): 11507. http://dx.doi.org/10.1039/c003652h.

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23

Stagniūnaitė, Raminta, Virginija Kepenienė, Aldona Balčiūnaitė, Audrius Drabavičius, Vidas Pakštas, Vitalija Jasulaitienė, Loreta Tamašauskaitė-Tamašiūnaitė e Eugenijus Norkus. "An Electrocatalytic Activity of AuCeO2/Carbon Catalyst in Fuel Cell Reactions: Oxidation of Borohydride and Reduction of Oxygen". Catalysts 11, n.º 3 (7 de março de 2021): 342. http://dx.doi.org/10.3390/catal11030342.

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This paper describes the investigation of electrocatalytic activity of the AuCeO2/C catalyst, prepared using the microwave irradiation method, towards the oxidation of sodium borohydride and oxygen reduction reactions in an alkaline medium. It was found that the obtained AuCeO2/C catalyst with Au loading and electrochemically active surface area of Au nanoparticles (AuNPs) equal to 71 µg cm−2 and 0.05 cm2, respectively, showed an enhanced electrocatalytic activity towards investigated reactions, compared with the Au/C catalyst with an Au loading and electrochemically active surface area of AuNPs equal to 78 µg cm−2 and 0.19 cm2, respectively. The AuCeO2/C catalyst demonstrated ca. 4.5 times higher current density values for the oxidation of sodium borohydride compared with those of the bare Au/C catalyst. Moreover, the onset potential of the oxygen reduction reaction (0.96 V) on the AuCeO2/C catalyst was similar to the commercial Pt/C (0.98 V).
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24

Mitovski, Aleksandra, Nada Štrbac, Miroslav Sokić, Milan Kragović e Vesna Grekulović. "Reaction mechanism and kinetics of sulfide copper concentrate oxidation at elevated temperatures". Metallurgical and Materials Engineering 23, n.º 3 (30 de setembro de 2017): 267–80. http://dx.doi.org/10.30544/320.

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Sulfide copper concentrate from domestic ore deposit (Bor, Serbia) was subjected to oxidation in the air atmosphere due to a better understanding of reaction mechanism and oxidation of various sulfides present in the copper concentrate at elevated temperatures. Results of the initial sample characterization showed that concentrate is chalcopyrite–enargite-tennantite type, with an increased arsenic content. Characterization of the oxidation products showed the presence of sulfates, oxysulfates, and oxides. Based on predominance area diagrams for Me-S-O systems (Me = Cu, Fe, As) combined with thermal analysis results, the reaction mechanism of the oxidation process was proposed. The reactions which occur in the temperature range 25 – 1000 °C indicate that sulfides are unstable in the oxidative conditions. Sulfides from the initial sample decomposed into binary copper and iron sulfides and volatile arsenic oxides at lower temperatures. Further heating led to oxidation of sulfides into iron oxides and copper sulfates and oxysulfates. At higher temperatures sulfates and oxysulfates decomposed into oxides. Kinetic analysis of the oxidation process was done using Ozawa’s method in the non-isothermal conditions. The values for activation energies showed that the reactions are chemically controlled and the temperature is the most influential parameter on the reaction rates.
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25

Gasparotto, Luiz H. S., Amanda C. Garcia, Janaina F. Gomes e Germano Tremiliosi-Filho. "Electrocatalytic performance of environmentally friendly synthesized gold nanoparticles towards the borohydride electro-oxidation reaction". Journal of Power Sources 218 (novembro de 2012): 73–78. http://dx.doi.org/10.1016/j.jpowsour.2012.06.064.

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26

Paschoalino, Waldemir J., e Edson A. Ticianelli. "An investigation of the borohydride oxidation reaction on La–Ni-based hydrogen storage alloys". International Journal of Hydrogen Energy 38, n.º 18 (junho de 2013): 7344–52. http://dx.doi.org/10.1016/j.ijhydene.2013.04.036.

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27

Chatenet, M., M. B. Molina-Concha e J. P. Diard. "First insights into the borohydride oxidation reaction mechanism on gold by electrochemical impedance spectroscopy". Electrochimica Acta 54, n.º 6 (fevereiro de 2009): 1687–93. http://dx.doi.org/10.1016/j.electacta.2008.09.060.

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28

Dahal, Rashmi, Jenny G. Vitillo, Anna C. Åsland, Christoph Frommen, Stefano Deledda e Olena Zavorotynska. "X-ray and Synchrotron FTIR Studies of Partially Decomposed Magnesium Borohydride". Energies 15, n.º 21 (27 de outubro de 2022): 7998. http://dx.doi.org/10.3390/en15217998.

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Magnesium borohydride (Mg(BH4)2) is an attractive compound for solid-state hydrogen storage due to its lucratively high hydrogen densities and theoretically low operational temperature. Hydrogen release from Mg(BH4)2 occurs through several steps. The reaction intermediates formed at these steps have been extensively studied for a decade. In this work, we apply spectroscopic methods that have rarely been used in such studies to provide alternative insights into the nature of the reaction intermediates. The commercially obtained sample was decomposed in argon flow during thermogravimetric analysis combined with differential scanning calorimetry (TGA-DSC) to differentiate between the H2-desorption reaction steps. The reaction products were analyzed by powder X-ray diffraction (PXRD), near edge soft X-ray absorption spectroscopy at boron K-edge (NEXAFS), and synchrotron infrared (IR) spectroscopy in mid- and far-IR ranges (SR-FTIR). Up to 12 wt% of H2 desorption was observed in the gravimetric measurements. PXRD showed no crystalline decomposition products when heated at 260–280 °C, the formation of MgH2 above 300 °C, and Mg above 320 °C. The qualitative analysis of the NEXAFS data showed the presence of boron in lower oxidation states than in (BH4)−. The NEXAFS data also indicated the presence of amorphous boron at and above 340 °C. This study provides additional insights into the decomposition reaction of Mg(BH4)2.
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Cocic, Mira, Mihovil Logar, Sasa Cocic, Dragana Zivkovic, Branko Matovic e Snezana Devic. "Determination of sulphide concentrates of ore copper by XRPD and chemical analysis". Chemical Industry 63, n.º 4 (2009): 319–24. http://dx.doi.org/10.2298/hemind0904319c.

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Roasting process of sulphide copper concentrates in fluo-solid reactor is an oxidation process, and presents the first stage of copper concentrate processing in Copper Mining and Smelting Complex Bor, RTB Bor. Therefore, the importance of accurate and up to date process control is an apparent precondition for the correct treatment in the following stages and also for of high grade cathode copper. As concentrate is fed into the roaster, it is heated by a stream of hot air to about 590?C. The process takes place between solid and gaseous phases without the appearance of a liquid phase. The heat generated by the exothermic oxidation reaction of sulphur from cooper and iron minerals (chalcopyrite and pyrite) is sufficient to carry out the entire process autogenously at temperature from 620 to 670?C. The temperature of sulphur firing which defines the start of roasting depends on physical traits, particle size of sulfides and characteristic product of oxidation. The obtained products of the roasting process are: calcine, ready for smelting in the furnace and gas-rich sulphure dioxide (SO2), well suited for the production of sulfuric acid. The relationship between the quantitative mineral composition of the charge and of the calcine directly points out to the efficiency of the roasting process in fluo-solid reactor. The amount of bornite and magnetite, resulting from the sulfide oxidation is the most important parameter. Hence, quantitative determination of mineral composition is of great interest. In this work, the results of the determination of quantitative mineral composition of the copper sulphide concentrate (charge) and products of their roasting (calcine and overflow) in fluo-solid reactor in the RTB Bor are presented. The aim was to compare the results of the iron, copper, sulfur and oxygen contents determined by two independent techniques, the chemical (HA) and X-ray powder diffraction analysis (XRPD) that is based on the quantitative mineral composition. Differences in the obtained results are evident, but small enough to confirm the reliability of measurement.
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30

Olu, Pierre-Yves, Bruno Gilles, Nathalie Job e Marian Chatenet. "Influence of the surface morphology of smooth platinum electrodes for the sodium borohydride oxidation reaction". Electrochemistry Communications 43 (junho de 2014): 47–50. http://dx.doi.org/10.1016/j.elecom.2014.02.018.

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31

Yeh, Yi Qi, Chun Wan Yen, Hong-Ping Lin, Yu Cheng Lin e Tsung Chain Chang. "Synthesis of Au Nanoparticles@Mesoporous Silica Templated by Neutral Block Copolymers: Application in CO Oxidation". Materials Science Forum 505-507 (janeiro de 2006): 655–60. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.655.

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A citrate-stabilizing Au nanoparticles aqueous solution was prepared at near 0 oC by reducing tetracholoaurate(III) ions with sodium borohydride. Combining with Pluronic block copolymers, the citrate-stabilizing Au nanoparticles was nearly completely embedded in the mesoporous silica channels via fast silicification with silicate solution at near neutral pH. After calcination for removing organic templates, Au nanoparticles@mesoporous silicas of high surface area and pore volume were obtained. With different block copolymer, the pore size of the mesoporous silica can be tuned. The Au nanoparticles@SBA-15 mesoporous silica exhibits high catalytic activity to CO oxidation reaction.
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32

Yang, Qiao Wen, Peng Fei Li, Ying Zhu, Chen Ying, Jin Lei Zuo, Hai Jun Dan e Shao He Shi. "Study on Catalysis Properties of Graphene Catalyst Loading Iron Oxide". Applied Mechanics and Materials 316-317 (abril de 2013): 1014–17. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.1014.

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The graphite oxide was synthesized with Hummers liquid-phase oxidation method in experiment, and then was reduced to graphene by sodium borohydride, the iron oxide was loaded by dipping method. The catalyst that made reacted in SCR reaction unit in laboratory, the catalysis properties of catalyst was investigated. The experiment results showed that graphene was flake nanometer sheet and presented transparent fold shape, its crystal structure was in order arrangement; the nature of graphene was close to that of raw graphite; their surface function groups were similar; Fe/graphene SCR catalysts had certain catalytic ability in the reaction, the NO conversion rate of catalyst was about 50% while the temperature range was from 200°C to 300°C.
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33

Sun, Guo Xun, Jian Qiang Bi, Wei Li Wang, Xu Xia Hao, Xi Cheng Gao, Wei Kang Yan e Lu Wang. "Synthesis of Boron Nitride Coating on Graphene". Solid State Phenomena 281 (agosto de 2018): 499–503. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.499.

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A method to synthesize boron nitride (BN) coating on the surface of graphene has been developed. BN coating was synthesized by the direct reaction of sodium borohydride and ammonium chloride at a relatively low temperature of 600 °C. Synthesized sample was characterized by RAM, XRD, FESEM, TEM and XPS. It is revealed that the BN coating combines with graphene through van der Waals interactions, and the elements B and N distribute homogeneously on the surface of graphene. Thermogravimetric analysis showed that the oxidation resistance of the graphene was improved after being coated with BN.
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34

Shimada, Kazuaki, Shigenobu Aoyagi e Yuji Takikawa. "Formation of a Sterically Crowded 1,6,6αλ4-Triselenapentalene and 4H-Selenopyran-4-selones Fused with Two Bornane Skeletons Through the Reaction of d-Camphor p-Toluenesulfonylhydrazone With a Base and Elemental Selenium". Natural Product Communications 15, n.º 2 (fevereiro de 2020): 1934578X1989668. http://dx.doi.org/10.1177/1934578x19896686.

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Reaction of d-camphor p-toluenesulfonylhydrazone with t-butoxide and elemental selenium in dimethylformamide at an elevated temperature afforded a stable compound having a unique 1,6,6αλ4-triselenapentalene ring and 4 H-selenopyran-4-selones along with dialkenyl diselenide, dibornylenes, and 1,2,5-triselenepin, and the structural confirmation of these products were carried out by X-ray crystallographic analysis. The sterically crowded 1,6,6aλ4-triselenapentalene ring fused with two bornane sleketons was stable enough under aerobic exposure and was inactive toward sodium borohydride reduction but was converted into 1,2-diselenole derivative through m-chloroperbenzoic acid oxidation.
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35

Chatenet, Marian, Fabio H. Lima e Edson A. Ticianelli. "Study of the Borohydride Oxidation Reaction on Gold in Alkaline Medium Using On-Line Mass Spectrometry". ECS Transactions 25, n.º 13 (17 de dezembro de 2019): 39–48. http://dx.doi.org/10.1149/1.3315171.

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36

Swider-Lyons, Karen, Rachel M. E. Hjelm, Yannick Garsany, Clemence Lafforgue e Marian Chatenet. "Improved Borohydride Oxidation Reaction Activity and Stability for Carbon-Supported Platinum Nanoparticles with Tantalum Oxyphosphate Interlayers". Journal of The Electrochemical Society 167, n.º 16 (1 de dezembro de 2020): 164508. http://dx.doi.org/10.1149/1945-7111/abcbb1.

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37

Backović, Gordana, Biljana Šljukić, Gulsah Saydan Kanberoglu, Mehmet Yurderi, Ahmet Bulut, Mehmet Zahmakiran e Diogo M. F. Santos. "Ruthenium(0) nanoparticles stabilized by metal-organic framework as an efficient electrocatalyst for borohydride oxidation reaction". International Journal of Hydrogen Energy 45, n.º 51 (outubro de 2020): 27056–66. http://dx.doi.org/10.1016/j.ijhydene.2020.07.034.

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38

Oliveira, Vanessa L., Eric Sibert, Yvonne Soldo-Olivier, Edson A. Ticianelli e Marian Chatenet. "Investigation of the electrochemical oxidation reaction of the borohydride anion in palladium layers on Pt(111)". Electrochimica Acta 209 (agosto de 2016): 360–68. http://dx.doi.org/10.1016/j.electacta.2016.05.093.

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39

Freitas, Kênia S., Belen Molina Concha, Edson A. Ticianelli e Marian Chatenet. "Mass transport effects in the borohydride oxidation reaction—Influence of the residence time on the reaction onset and faradaic efficiency". Catalysis Today 170, n.º 1 (julho de 2011): 110–19. http://dx.doi.org/10.1016/j.cattod.2011.01.051.

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40

Olu, Pierre-Yves, Antoine Bonnefont, Guillaume Braesch, Vincent Martin, Elena R. Savinova e Marian Chatenet. "Influence of the concentration of borohydride towards hydrogen production and escape for borohydride oxidation reaction on Pt and Au electrodes – experimental and modelling insights". Journal of Power Sources 375 (janeiro de 2018): 300–309. http://dx.doi.org/10.1016/j.jpowsour.2017.07.061.

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41

Rañoa, Mary Elyssa R., Matthew L. Villanueva, Justienne Rei P. Laxamana, Hannah Grace G. Necesito e Bernard John V. Tongol. "Palladium/coconut husk biochar composite material as an effective electrocatalyst for ethanol oxidation reaction". Advances in Natural Sciences: Nanoscience and Nanotechnology 15, n.º 2 (24 de abril de 2024): 025003. http://dx.doi.org/10.1088/2043-6262/ad3de0.

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Abstract This study utilised coconut husk biochar as an alternative sustainable carbon support for Pd-based electrocatalyst for ethanol oxidation reaction in basic medium. Coconut husk biochar (BC) was prepared via slow pyrolysis at 800 °C for 1 h at a ramp rate of 5 °C min−1. The Pd/BC catalyst was prepared via borohydride-facilitated reduction of palladium chloride solution. TEM analysis revealed good dispersion of the Pd nanoparticles on the biochar support with particle size ranging from 1.9 to 3.4 nm. Cyclic voltammetry (CV) measurements of Pd/BC in 1.0 M ethanol in 0.1 M KOH gave an on-set potential of −0.615 V (versus Ag/AgCl) with a forward peak current density of 23.87 mA cm−2, which is slightly higher than the commercial Pd/C catalyst. The Pd/BC also has a higher electrochemical stability and durability than the commercial Pd/C catalyst based on chronoamperometry studies (i.e., 44.43% versus 39.64% current retention). The synthesised coconut husk biochar–supported Pd catalyst exhibited promising results for ethanol oxidation reaction for alkaline direct ethanol fuel cell application.
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42

Ko, Youngdon, Loris Lombardo, Mo Li, Thi Ha My Pham, Heena Yang e Andreas Züttel. "Selective Borohydride Oxidation Reaction on Nickel Catalyst with Anion and Cation Exchange Ionomer for High‐Performance Direct Borohydride Fuel Cells (Adv. Energy Mater. 16/2022)". Advanced Energy Materials 12, n.º 16 (abril de 2022): 2270063. http://dx.doi.org/10.1002/aenm.202270063.

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43

Braesch, Guillaume, Antoine Bonnefont, Vincent Martin, Elena R. Savinova e Marian Chatenet. "Borohydride oxidation reaction mechanisms and poisoning effects on Au, Pt and Pd bulk electrodes: From model (low) to direct borohydride fuel cell operating (high) concentrations". Electrochimica Acta 273 (maio de 2018): 483–94. http://dx.doi.org/10.1016/j.electacta.2018.04.068.

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44

Molina Concha, Belén, Marian Chatenet, Edson A. Ticianelli e Fabio H. B. Lima. "In Situ Infrared (FTIR) Study of the Mechanism of the Borohydride Oxidation Reaction on Smooth Pt Electrode". Journal of Physical Chemistry C 115, n.º 25 (6 de junho de 2011): 12439–47. http://dx.doi.org/10.1021/jp2002589.

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45

Parrour, Gaëlle, Marian Chatenet e Jean-Paul Diard. "Electrochemical impedance spectroscopy study of borohydride oxidation reaction on gold—Towards a mechanism with two electrochemical steps". Electrochimica Acta 55, n.º 28 (dezembro de 2010): 9113–24. http://dx.doi.org/10.1016/j.electacta.2010.07.086.

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46

Mane, Ramchandra Bhimrao, e Abhijit Jaysingrao Kadam. "A New Synthesis of Occidol". Collection of Czechoslovak Chemical Communications 64, n.º 3 (1999): 533–38. http://dx.doi.org/10.1135/cccc19990533.

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Sodium borohydride reduction of 5,8-dimethyl-3,4-dihydronaphthalen-1-(2H)-one (4) yielded 5,8-dimethyl-1,2,3,4-tetrahydro-1-naphthol (5). The tetralol 5 on Vilsmeier-Haack reaction with N,N-dimethylacetamide yielded 1-(5,8-dimethyl-3,4-dihydro-2-naphthyl)ethan-1-one (7) which on hydrogenation over Pd/C afforded 1-(5,8-dimethyl-1,2,3,4-tetrahydro-2-naphthyl)ethan-1-one (8). The tetralol 5 on Vilsmeier-Haack formylation gave 5,8-dimethyl-3,4-dihydro-2-naphthaldehyde (9) which on reduction with lithium aluminium hydride followed by oxidation with the Jones reagent furnished 5,8-dimethyl-1,2,3,4-tetrahydro-2-naphthoic acid (11). The acid 11 on treatment with excess of methyllithium yielded (±)-occidol (1); with two moles of methyllithium it yielded ketone 8, which on reaction with methyllithium furnished (±)-occidol (1).
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47

Freitas, KÊnia S., Belén Molina Concha, Edson A. Ticianelli e Marian Chatenet. "Borohydride Oxidation on Pt-Based Electrodes: Evidence of Residence Time Effect on the Reaction Onset and Faradaic Efficiency". ECS Transactions 33, n.º 1 (17 de dezembro de 2019): 1693–99. http://dx.doi.org/10.1149/1.3484659.

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48

Rhee, Hakjune, Gwangil An, Minkyung Lim e Kwon-Soo Chun. "Environmentally Benign Oxidation Reaction of Benzylic and Allylic Alcohols to Carbonyl Compounds Using Pd/C with Sodium Borohydride". Synlett 2007, n.º 1 (janeiro de 2007): 0095–98. http://dx.doi.org/10.1055/s-2006-956457.

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49

Lafforgue, Clémence, Robert W. Atkinson, Karen Swider-Lyons e Marian Chatenet. "Evaluation of carbon-supported palladium electrocatalysts for the borohydride oxidation reaction in conditions relevant to fuel cell operation". Electrochimica Acta 341 (maio de 2020): 135971. http://dx.doi.org/10.1016/j.electacta.2020.135971.

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50

Wang, Jiali, Fuyi Chen, Yachao Jin, Yimin Lei e Roy L. Johnston. "One-Pot Synthesis of Dealloyed AuNi Nanodendrite as a Bifunctional Electrocatalyst for Oxygen Reduction and Borohydride Oxidation Reaction". Advanced Functional Materials 27, n.º 23 (10 de abril de 2017): 1700260. http://dx.doi.org/10.1002/adfm.201700260.

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