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Journal articles on the topic 'Platinum. Substitution reactions. Oxidation-reduction reaction'

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Published: 4 June 2021
Last updated: 2 February 2022

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1

Su, Min, Li Wei Tang, Sheng Wang, Hao Dan Liu, and Sheng Chen. "Synthesis and Electrochromic Properties of Soluble Polythiophenes." Advanced Materials Research 476-478 (February 2012): 1383–87. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.1383.

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Two kinds of 3-alkoxythiophene monomers were synthesized by the nucleophilic substitution and transetherification reactions. Soluble conjugated polymers based on 3-alkoxythiophene were synthesized by electrochemical polymerization. The process of the electrochemical polymerization, electrochemical redox behaviors and electrochromis of the polymer were investigated by the cyclic voltammetry and spectroelectrochemical measurement. The onset oxidation potentials (Eonset(ox)) of both POT and OOT were at 1040mV (vs. Ag/AgCl) in electrolyte solution system.The oxidation and reduction potential of PP
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2

Bond, AM, R. Colton, DR Mann, and JE Moir. "Characterization of Tris(Diselenocarbamato)Cobalt(III) and Pentakis(Diselenocarbamato)Dicobalt(III) Complexes by Electrochemical, Cobalt-59 N.M.R. and Mass-Spectrometric Techniques. Comparisons With Dithiocarbamate Analogs." Australian Journal of Chemistry 39, no. 9 (1986): 1385. http://dx.doi.org/10.1071/ch9861385.

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A series of Co(RR′dsc)3 and [Co2(RR′dsc)5]+ complexes (R, R′ = two alkyl groups or one heterocyclic group; dsc = NCSe2) have been synthesized and their redox behaviour, chemical reactivity and spectroscopic properties compared with the corresponding dithiocarbamate (RR′dtc) complexes. Electrochemical oxidation of Co(RR′dsc)3 in dichloromethane at platinum electrodes occurs at potentials about 0.34 V less positive than for Co(RR′dsc)3. The formally cobalt(IV) complexes [Co(RR′dsc)3]+ can be identified as a product which is then converted into [Co2(RR′dsc)5]+ via dimerization and an internal red
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3

Romanchenko, Alexander, Maxim Likhatski, and Yuri Mikhlin. "X-ray Photoelectron Spectroscopy (XPS) Study of the Products Formed on Sulfide Minerals Upon the Interaction with Aqueous Platinum (IV) Chloride Complexes." Minerals 8, no. 12 (2018): 578. http://dx.doi.org/10.3390/min8120578.

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The interaction of aqueous solutions bearing platinum-group elements (PGEs) with sulfides is important for understanding the formation and weathering of PGE ore deposits, mineral processing, and synthesis of nanomaterials. Here, the surface species formed upon the contact of the main sulfide minerals (pyrite, pyrrhotite, galena, chalcopyrite and valleriite) with the solutions of H2PtCl6 (pH 1.5, 20 °C) have been studied using X-ray photoelectron spectroscopy (XPS). Uptake of Pt increased gradually with increasing interaction time, and depended, as well as the composition of immobilized product
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4

Šebesta, Filip, and Jaroslav V. Burda. "Side Reactions with an Equilibrium Constraint: Detailed Mechanism of the Substitution Reaction of Tetraplatin with dGMP as a Starting Step of the Platinum(IV) Reduction Process." Journal of Physical Chemistry B 121, no. 17 (2017): 4400–4413. http://dx.doi.org/10.1021/acs.jpcb.7b01427.

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5

Yin, Wong Wai, Wan Ramli Wan Daud, Abu Bakar Mohamad, Abdul Amir Hassan Kadhum, Loh Kee Shyuan, and Edy Herianto Majlan. "Density-Functional Theory of O2 Physical Adsorption on sp3 and sp2 Hybridized Nitrogen-Doped CNT Surfaces for Fuel Cell Electrode." Advanced Materials Research 233-235 (May 2011): 17–22. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.17.

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Catalysis is the major process involved in fuel cell technology to generate electricity which is known renewable. Generally, fuel cell electrodes utilize platinum supported carbon to catalyze the reactions at both cathode and anode. However, cheaper substitution materials such as nitrogen-doped carbon catalyst have attracted greater attention in recent year due to its significant catalytic activity at cathode in fuel cell. Nitrogen-doped CNT (N-CNT) is believed to allow oxygen reduction reaction (ORR) at cathode to take place which play a role as n-type dopant for electrical conductivity. The
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6

Zhao, Huawang, Lei Han, Yujie Wang, and Jiandong Zheng. "Insight into Platinum Poisoning Effect on Cu-SSZ-13 in Selective Catalytic Reduction of NOx with NH3." Catalysts 11, no. 7 (2021): 796. http://dx.doi.org/10.3390/catal11070796.

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Platinum’s (Pt) poisoning effect on Cu-SSZ-13 and its regeneration were investigated. The Pt enhanced the parallel reactions, such as NH3 oxidation and NO oxidation reactions, which decreased the deNOx activities. In the temperature range below 330 °C, the deactivation of Cu-SSZ-13 by Pt poisoning was primarily caused by the overconsumption of NH3, due to the enhanced NH3-selective oxidation reaction, while the formation of NOx in NH3 oxidation and NO oxidation into NO2 further aggravated the degradation when the temperature was above 460 °C. The non-selective NH3 oxidation and non-selective N
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7

Hartnell, Regan D., Alison J. Edwards та Dennis P. Arnold. "Peripherally-metallated porphyrins: meso-η1-porphyrinyl-platinum(II) complexes of 5,15-diaryl- and 5,10,15-triarylporphyrins". Journal of Porphyrins and Phthalocyanines 06, № 11 (2002): 695–707. http://dx.doi.org/10.1142/s1088424602000828.

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Attempted metathesis reactions of peripherally-metallated meso-η1-porphyrinylplatinum(II) complexes such as trans-[ PtBr ( NiDPP )( PPh 3)2]( H 2 DPP = 5,15- diphenylporphyrin ) with organolithium reagents fail due to competitive addition at the porphyrin ring carbon opposite to the metal substituent. This reaction can be prevented by using 5,10,15-triarylporphyrins, e.g. 5,10,15-triphenylporphyrin ( H 2 TrPP ) and 5-phenyl-10,20-bis(3′,5′-di-t-butylphenyl)porphyrin ( H 2 DAPP ) as substrates. These triarylporphyrins are readily prepared using the method of Senge and co-workers by addition of
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8

Wu, Yan Ni, Hai Fu Guo, Peng Hu, Xiao Peng Xiao, Zhao Wang Xiao, and Shi Jun Liao. "A Comparative Study on Ternary Low-Platinum Catalysts with Various Constructions for Oxygen Reduction and Methanol Oxidation Reactions." Nano 11, no. 07 (2016): 1650081. http://dx.doi.org/10.1142/s1793292016500818.

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Three types of ternary low-platinum nanocatalysts, alloy PdPtIr/C, core–shell PdPt@PtIr/C and Pd@PtIr/C, have been prepared, and their catalytic behaviors toward methanol oxidation reaction (MOR)/oxygen reduction reaction (ORR) are comparatively investigated via cyclic voltammetry and chronoamperometry analysis in an acidic medium. Through a two-step colloidal technique, the synthesized core–shell structured catalyst PtPd@PtIr/C with alloy core and alloy shell show the best catalytic activity toward MOR and the best poisoning tolerance. The alloy PdPtIr/C catalyst prepared via a one-step collo
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9

Lindner, Ekkehard, and Robert Speidel. "Neuartige basische Liganden für die homogenkatalytische Methanolcarbonylierung, XXI [1] Synthese und Eigenschaften von (Ether-Phosphan)-Platin-Komplexen / Novel Basic Ligands for the Homogenous Catalytic Methanol Carbonylation, XXI [1] Synthesis and Properties of (Ether-Phosphane) Platinum Complexes." Zeitschrift für Naturforschung B 44, no. 4 (1989): 437–43. http://dx.doi.org/10.1515/znb-1989-0411.

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The (ether-phosphane) complexes cis-Cl2Pt(Ph2P∼D )2 (2a, b) [D = CH2C4H7O (a). C H2C4H7O2 (b)] are obtained by reaction of Ph2P∼D (1a , b) with either K2PtCl4 or Cl2Pt(COD) (COD = 1,5-cyclooctadiene). Both Cl- anions are abstracted from 2a, b using AgSbF6 to give the cationic bischelate complexes (5a, b). The stepwise cleavage and reform ation of Pt-O bonds in (ether-phosphane) platinum complexes is demonstrated bv the sequence (6a) → [trans-(Ph2P∼D )2PtCO(Cl)][SbF6] (7 a )→5a, when 5a, 6a, and 7a are reacted with KCl, CO, and AgSbF6 respectively. Reduction of 2a with NaBH4 results in the form
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10

Carvalho, M. Fernanda N. N., Armando J. L. Pombeiro, Gabriele Wagner, Bjørn Pedersen, and Rudolf Herrmann. "Cascade Reaction of Camphor-Derived Diynes with Transition Metal Compounds." Zeitschrift für Naturforschung B 54, no. 6 (1999): 725–33. http://dx.doi.org/10.1515/znb-1999-0604.

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Platinum(II) catalyzes the isomerization of camphor sulfonamide diynes in a cascade reaction involving annulation of a five-membered ring to the camphor skeleton, ring-enlargement by C-C bond cleavage, reduction of sulfur(VI) to sulfur(IV), and oxidation of a hydroxy group to a ketone. The reactions of the diynes with other transition metal compounds were also studied. Copper, gold and rhenium give final products similar to those obtained with simple Brønsted acids or halogens, mainly by annulation o f a five-membered ring to the camphor moiety, accompanied by reduction of a sulfonamide to a s
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11

Wang, Kang-Kyun, Bong-Jin Kim, Si-Hwan Ko, Dong Hoon Choi, and Yong-Rok Kim. "Fabrication of Photofunctional Nanoporous Membrane and Its Photoinactivation Effect of Vesicular Stomatitis Virus." Journal of Nanomaterials 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/454507.

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Fabrication and photophysical study of photofunctional nanoporous alumina membrane (PNAM) were performed, and its application of photodynamic antimicrobial chemotherapy (PACT) was investigated. Nanoporous alumina membrane (NAM) was fabricated by two-step aluminium anodic oxidation process. Surface of the fabricated NAM was modified with organo-silane agent to induce covalent bonding between NAM and a photosensitizer (PtCP: [5,10,15-triphenyl-20-(4-methoxycarbonylphenyl)-porphyrin] platinum). PtCP was covalently bonded to the surface of the modified NAM by nucleophilic acyl substitution reactio
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12

Broaddus, Eric, Joel Brubaker, and Scott A. Gold. "Electrochemical Characterization of Platinum Nanotubules Made via Template Wetting Nanofabrication." International Journal of Electrochemistry 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/960513.

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Standard oxidation-reduction reactions such as those of ferrocyanide and ferrocene have long been employed in evaluating and comparing new electrode structures with more traditional configurations. A variety of nanostructured carbon electrodes developed in recent years have been reported to exhibit faster electron transfer kinetics than more traditional carbon structures when studied with these redox reactions. This type of comparison has not been widely explored for nanostructured platinum electrodes that have become increasingly common. In this work, a platinum nanotubule array electrode was
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13

Trunov, Aleksey M. "Oxygen-Containing Nanoclusters on the Surface of Pt-Electrodes and Oxygen Reduction Reaction in Alkaline Medium." International Journal of Electrochemistry 2018 (June 4, 2018): 1–13. http://dx.doi.org/10.1155/2018/7164578.

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Analysis of the role of oxygen-containing nanoclusters in oxygen reduction reaction (ORR) on Pt-electrodes in alkaline media is provided on the basis of the concept of electrochemical processes with slowed stage of consecutive heterogeneous chemical reaction (ConHCR). Under the ConHCR concept, the main factor determining the ORR characteristics is energetic inhomogeneity of electrode surface (EIES) according to Temkin. A new concept, according to which EIES is determined by the Gibbs energy of formation of oxygen-containing surface structures with inclusions of surface defects of the platinum
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14

Lorenz, Oliver, Alexander Kühne, Martin Rudolph, et al. "Role of Reaction Intermediate Diffusion on the Performance of Platinum Electrodes in Solid Acid Fuel Cells." Catalysts 11, no. 9 (2021): 1065. http://dx.doi.org/10.3390/catal11091065.

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Understanding the reaction pathways for the hydrogen oxidation reaction (HOR) and the oxygen reduction reaction (ORR) is the key to design electrodes for solid acid fuel cells (SAFCs). In general, electrochemical reactions of a fuel cell are considered to occur at the triple-phase boundary where an electrocatalyst, electrolyte and gas phase are in contact. In this concept, diffusion processes of reaction intermediates from the catalyst to the electrolyte remain unconsidered. Here, we unravel the reaction pathways for open-structured Pt electrodes with various electrode thicknesses from 15 to 2
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15

Piskunov, S., Y. F. Zhukovskii, M. N. Sokolov, and J. Kleperis. "AB Initio Calculations of CUN@Graphene (0001) Nanostructures for Electrocatalytic Applications." Latvian Journal of Physics and Technical Sciences 55, no. 6 (2018): 30–34. http://dx.doi.org/10.2478/lpts-2018-0041.

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Abstract Substitution of fossil-based chemical processes by the combination of electrochemical reactions driven by sources of renewable energy and parallel use of H2O and CO2 to produce carbon and hydrogen, respectively, can serve as direct synthesis of bulk chemicals and fuels. We plan to design and develop a prototype of electrochemical reactor combining cathodic CO2-reduction to ethylene and anodic H2O oxidation to hydrogen peroxide. We perform ab initio calculations on the atomistic 2D graphene-based models with attached Cu atoms foreseen for dissociation of CO2 and H2O containing complexe
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16

Mohiuddin, A. K. M. "Development of Catalytic Converter Using Non-Precious Metals." Advanced Materials Research 1115 (July 2015): 462–67. http://dx.doi.org/10.4028/www.scientific.net/amr.1115.462.

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This paper shows the uses of low cost metal for the development of catalytic converters. While bringing down the cost, attention must be paid on the performance capability of the catalytic converter. The objective of this work is to develop and design a low cost catalytic converter using copper as the main catalyst in the catalyst system. Copper powder was chosen as the alternative catalyst to reduce the use of precious group metals (PGMs) platinum, palladium, and rhodium. A spark ignition engine’s catalytic converter has to perform the oxidation of CO, oxidation of HC and reduction of NOxsimu
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17

Shaw, J. P., F. Schwager, and S. Harayama. "Substrate-specificity of benzyl alcohol dehydrogenase and benzaldehyde dehydrogenase encoded by TOL plasmid pWW0. Metabolic and mechanistic implications." Biochemical Journal 283, no. 3 (1992): 789–94. http://dx.doi.org/10.1042/bj2830789.

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The substrate-specificities of benzyl alcohol dehydrogenase and benzaldehyde dehydrogenase, encoded by TOL plasmid pWW0 of Pseudomonas putida mt-2, were determined. The rates of benzyl alcohol dehydrogenase-catalysed oxidation of substituted benzyl alcohols and reduction of substituted benzaldehydes were independent of the electronic nature of the substituents at positions 3 and 4. Substitutions at position 2 of benzyl alcohol affected the reactivity of benzyl alcohol dehydrogenase: the velocity of the benzyl alcohol dehydrogenase-catalysed oxidation was lower for compounds possessing electron
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18

Swaddle, T. W. "Inorganic solution chemistry at elevated pressures." Canadian Journal of Physics 73, no. 5-6 (1995): 258–66. http://dx.doi.org/10.1139/p95-037.

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Recent interest in pressure effects on inorganic systems in solution has been centred upon the use of volumes of activation ΔV‡ as criteria of reaction mechanism. Work in our laboratory has sought to determine whether ΔV‡ is indeed a useful parameter in this respect, i.e., whether it is substantially independent of pressure and reaction conditions and whether it can be quantitatively predicted for suitably "simple" reactions. For solvent exchange on metal ions (the simplest conceivable substitution process), a semi-empirical model predicts ΔV‡ for limiting dissociative (bond breaking) and asso
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19

Lee, Young-Woo, SeungNam Cha, Kyung-Won Park, Jung Inn Sohn, and Jong Min Kim. "High Performance Electrocatalysts Based on Pt Nanoarchitecture for Fuel Cell Applications." Journal of Nanomaterials 2015 (2015): 1–20. http://dx.doi.org/10.1155/2015/273720.

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Fuel cells, converting chemical energy from fuels into electricity directly without the need for combustion, are promising energy conversion devices for their potential applications as environmentally friendly, energy efficient power sources. However, to take fuel cell technology forward towards commercialization, we need to achieve further improvements in electrocatalyst technology, which can play an extremely important role in essentially determining cost-effectiveness, performance, and durability. In particular, platinum- (Pt-) based electrocatalyst approaches have been extensively investig
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20

Pihera, Pavel, and Jiří Svoboda. "Reactivity Studies of [1]Benzothieno[3,2-b][1]benzofuran." Collection of Czechoslovak Chemical Communications 65, no. 1 (2000): 58–76. http://dx.doi.org/10.1135/cccc20000058.

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Electrophilic substitution and metallation reactions of the title compound 1 were studied. Bromination, acetylation, benzoylation, formylation, and nitration usually afforded nonseparable mixtures of 2- and 7-substituted derivatives as the main product. Disubstitution reactions preferably led to 2,7-disubstituted derivatives. [1]Benzothieno[3,2-b][1]benzofuran 10,10-dioxide (17) and [1]benzothieno[3,2-b][1]benzofuran 10-oxide (18) can be selectively obtained by oxidation of 1. Mononitration of 17 and 18 led selectively to corresponding 7-nitro derivatives 19 and 21, respectively. Only sulfoxid
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21

Huyen, Tran Thi Thu, Tran Thi Luyen, and Nguyen Thi Tuyet Mai. "The Determing Activation Energy of Total Oxidation Reaction of m-xylene over La0,7Sr0,3BO3 (B = Mn, Fe, Ni) Perovskite Catalysts." VNU Journal of Science: Natural Sciences and Technology 33, no. 4 (2017). http://dx.doi.org/10.25073/2588-1140/vnunst.4493.

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Perovskite-type oxides containing rare earth ions and transition metals are of interest for catalytic oxidation and reduction reactions associated with automotive exhaust emission control. They are known to exhibit a good catalytic activity in the total oxidation reaction of carbon monoxide or hydrocarbon and removal of nitrogen oxides. By partially substitution of A and B ions of the perovskite with others, a wide variety of mixed oxides A1-xA’xB1-yB’yO3 can be obtained, allowing the systematic modification of the catalytic properties. We presented the preparation and the catalytic properties
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