Relevant bibliographies by topics / Iridium catalysts

Academic literature on the topic 'Iridium catalysts'

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Published: 4 June 2021
Last updated: 26 January 2023

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Journal articles on the topic "Iridium catalysts"

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Siebert, Max, Golo Storch, Frank Rominger, and Oliver Trapp. "Temperature-Controlled Bidirectional Enantioselectivity in Asymmetric Hydrogenation Reactions Utilizing Stereodynamic Iridium Complexes." Synthesis 49, no. 15 (June 20, 2017): 3485–94. http://dx.doi.org/10.1055/s-0036-1588861.

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Stereochemically flexible 2,2(-bis(diphenylphosphino)biphenyl (BIPHEP) ligands were modified with chiral α-substituted carboxylic acid auxiliaries in the 3- and 3′-position. The resulting central-to-axial chirality transfer to the stereochemically flexible chiral axis of the BIPHEP­ core was investigated as well as complexation of these diastereomeric ligands to iridium(I). Solid-state structures of both ligand diastereomers and a diastereomerically pure iridium(I) BIPHEP complex were obtained. Thermal equilibration of the resulting iridium(I) complexes was studied to investigate the stereodynamic properties of the BIPHEP ligands. The iridium(I) complexes without and after pre-catalysis warming in solution — which induces a shift of the diastereomeric ratio — were applied for asymmetric hydrogenation of a prochiral α-substituted acrylic acid, resulting in temperature-controlled bidirectional enantioselectivity of iridium catalysts for the first time. In both cases, enantioenriched (R)-naproxen as well as (S)-naproxen — after re-equilibration of the catalyst at elevated temperatures — was obtained by using the same catalyst.
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Lukey, CA, MA Long, and JL Garnett. "Aromatic Hydrogen Isotope Exchange Reactions Catalyzed by Iridium Complexes in Aqueous Solution." Australian Journal of Chemistry 48, no. 1 (1995): 79. http://dx.doi.org/10.1071/ch9950079.

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Sodium hexachloroiridate (III) and sodium hexachloroiridate (IV) have been used as homogeneous catalysts for hydrogen isotope exchange between benzenoid compounds and water. The ideal solvent consisted of 50 mole % acetic acid/water, and the optimum temperature was found to be 160°C. Under these conditions the rate of incorporation of deuterium into benzene was significant (typically 15% D in 6 h), and reduction to iridium metal was minimized. The active catalytic species was identified as a solvated iridium(III) species, which is also postulated to be the active catalyst in solutions containing hexachloroiridate (IV). The kinetics of exchange in benzene catalysed by sodium hexachloroiridate (III) were elucidated, and found to be more complex than for the corresponding sodium tetrachloroplatinate (II) catalysed exchange, in that a two-term rate dependence was found for catalyst concentration and the reaction was inversely dependent on hydrogen ion concentration. The reaction was found to be independent of chloride ion concentration, this confirming that the active catalyst is a solvated species. Isotopic labelling in all compounds was confined to the aromatic ring, and most substituted benzenes exhibited deactivation of the ortho positions, indicating that a dissociative π-complex exchange mechanism was operating. This was confirmed by exchange into naphthalene, where it was found that labelling was predominantly in the β position. Facile exchange into nitrobenzene provided good evidence of homogeneous catalysis, and not catalysis by precipitated metal.
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Frety, R., P. N. Da Silva, and M. Guenin. "Supported iridium catalysts." Applied Catalysis 57, no. 1 (January 1990): 99–103. http://dx.doi.org/10.1016/s0166-9834(00)80726-5.

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Yoo, Dalsan, Jaegyu Woo, Seolyeong Oh, and Jong-Ki Jeon. "Performance of Pt and Ir Supported on Mesoporous Materials for Decomposition of Hydroxylammonium Nitrate Solution." Journal of Nanoscience and Nanotechnology 20, no. 7 (July 1, 2020): 4461–65. http://dx.doi.org/10.1166/jnn.2020.17598.

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The catalytic decomposition of hydroxylammonium nitrate (HAN) was investigated using a series of platinum and iridium supported on mesoporous materials. In this study, MMZY, KIT-6, and SBA-15 were used as supports. The effects of the active metal and the pore structure of the catalysts on decomposition of HAN solution were studied. The activity of the platinum catalysts supported on mesoporous material is much superior to that of the iridium catalysts on the same support. The Pt(10)/SBA-15 catalyst showed excellent decomposition activity and was the best among the catalysts tested here, which seemed to be because of the pore structure of Pt(10)/SBA-15. Because the pore size of Pt(10)/SBA-15 is larger than that of Pt(10)/MMZY and Pt(10)/KIT-6, it is more advantageous for diffusion of reactant and product gas. The activity of the catalyst increased as the amount of Pt loaded on the SBA-15 support increased.
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Amirsardari, Zahra, Akram Dourani, Mohamad Ali Amirifar, Nooredin Ghadiri Massoom, and Rahim Ehsani. "Development of novel supported iridium nanocatalysts for special catalytic beds." Journal of Nanostructure in Chemistry 10, no. 1 (December 26, 2019): 47–53. http://dx.doi.org/10.1007/s40097-019-00327-8.

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Abstract In the present paper, an experimental study of the catalytic decomposition of hydrous hydrazine was investigated on the different structural forms of the catalyst. The synthesized iridium catalysts have been usually used directly and have not been evaluated in the laboratory reactor. This study includes the preparation of iridium-based catalysts supported on spherical (alumina), honeycomb monoliths (cordierite) and foams (alumina) for the evaluation of catalytic activity in the laboratory reactor. The characterizations of these catalysts were evaluated by the TGA, FESEM and BET analysis. The result of the catalytic characterization of monolithic support was shown a homogeneous distribution of active metal without any problem of sintering (average size 25 nm) on the support surface. While the surface of the spherical and foam supports were shown non-uniform distribution of nanoparticles on the support skeleton (average size 55 nm). The monolithic catalyst exhibits higher decomposition rate and H2 selectivity than other supports due to uniform in shape and particle size distribution. Graphic abstract
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Jiménez, M. Victoria, Ana Ojeda-Amador, Raquel Puerta-Oteo, Joaquín Martínez-Sal, Vincenzo Passarelli, and Jesús Pérez-Torrente. "Selective Oxidation of Glycerol via Acceptorless Dehydrogenation Driven by Ir(I)-NHC Catalysts." Molecules 27, no. 22 (November 8, 2022): 7666. http://dx.doi.org/10.3390/molecules27227666.

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Iridium(I) compounds featuring bridge-functionalized bis-NHC ligands (NHC = N-heterocyclic carbene), [Ir(cod)(bis-NHC)] and [Ir(CO)2(bis-NHC)], have been prepared from the appropriate carboxylate- or hydroxy-functionalized bis-imidazolium salts. The related complexes [Ir(cod)(NHC)2]+ and [IrCl(cod)(NHC)(cod)] have been synthesized from a 3-hydroxypropyl functionalized imidazolium salt. These complexes have been shown to be robust catalysts in the oxidative dehydrogenation of glycerol to lactate (LA) with dihydrogen release. High activity and selectivity to LA were achieved in an open system under low catalyst loadings using KOH as a base. The hydroxy-functionalized bis-NHC catalysts are much more active than both the carboxylate-functionalized ones and the unbridged bis-NHC iridium(I) catalyst with hydroxyalkyl-functionalized NHC ligands. In general, carbonyl complexes are more active than the related 1,5-cyclooctadiene ones. The catalyst [Ir(CO)2{(MeImCH2)2CHOH}]Br exhibits the highest productivity affording TONs to LA up to 15,000 at very low catalyst loadings.
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Kumar, Prashant, Torsten Irrgang, George E. Kostakis, and Rhett Kempe. "Phosphine-free chiral iridium catalysts for asymmetric catalytic hydrogenation of simple ketones." RSC Adv. 6, no. 45 (2016): 39335–42. http://dx.doi.org/10.1039/c6ra04524c.

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Phosphine free iridium catalysts with simple structures show efficient enantioselectivities and activities in the asymmetric hydrogenation of simple ketones by using chiral iridium catalysts to chiral alcohols with up to 96% ee.
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Espinosa-Moreno, Francisco, Putrakumar Balla, Wenjie Shen, Juan Chavarria-Hernandez, Miguel Ruiz-Gómez, and Saúl Tlecuitl-Beristain. "Ir-Based Bimetallic Catalysts for Hydrogen Production through Glycerol Aqueous-Phase Reforming." Catalysts 8, no. 12 (December 3, 2018): 613. http://dx.doi.org/10.3390/catal8120613.

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Iridium, Iridium-Nickel and Iridium-Copper catalysts were prepared by incipient wetness impregnation and evaluated in the aqueous-phase reforming of glycerol using La2O3 or CeO2 as supports. The catalysts were characterized by N2 physisorption, XRD, H2-TPR, XPS, and EDS. The reactions were carried out in a fixed bed reactor feeding a solution of glycerol (10 wt %) in water, at 270 °C and 58 bar. All IrNi catalysts showed higher activity than Ir and IrCu, and in general, La2O3 catalysts showed a better performance when compared to CeO2 catalysts. The highest hydrogen production yield was reached by bimetallic IrNi catalysts with over 250 µmol min−1 gcat−1 for La2O3 and 150 µmol min−1 gcat−1 for CeO2.
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Pham, Pierce, and Christian Hilty. "Tunable iridium catalyst designs with bidentate N-heterocyclic carbene ligands for SABRE hyperpolarization of sterically hindered substrates." Chemical Communications 56, no. 98 (2020): 15466–69. http://dx.doi.org/10.1039/d0cc06840c.

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A series of iridium catalysts provides NMR sensitivity enhancement using para-hydrogen. The substrate exchange rate can be tuned for optimal polarization by the choice of an aryl and a nucleophilic moiety in the catalyst.
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Slavcheva, Evelina P. "Magnetron sputtered iridium oxide as anode catalyst for PEM hydrogen generation." Macedonian Journal of Chemistry and Chemical Engineering 30, no. 1 (June 15, 2011): 45. http://dx.doi.org/10.20450/mjcce.2011.69.

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Thin films of iridium oxide are deposited by reactive magnetron sputtering. The influence of oxygen partial pressure in the sputtering plasma on the composition, surface structure and morphology of the films has been studied by XRD, SEM, AFM and XPS analysis. An optimal combination of sputtering parameters yields stable microporous amorphous films with highly extended fractal surface. The electrochemical properties of these films are investigated in view of their application as catalysts for PEM water splitting, using the electrochemical techniques of cyclovoltammetry and steady state polarization. A morphology factor assessing the catalyst active surface for a series of sputtered samples with varying thickness/loading is determined and correlated to the catalytic efficiency. It has been proven that iridium oxide is a very efficient catalyst for oxygen evolution reaction (OER). The best performance with anodic current density of 0.3 A cm–2; at potential of 1.55 V (vs. RHE) shows the 500 nm thick film containing 0.2 mg cm-2; catalyst. These results combined with the established long-term mechanical stability of the sputtered iridium oxide films (SIROFs) prove the advantages of the reactive magnetron sputtering as simple and reliable method for preparation of catalysts with precisely controlled composition, loading, and surface characteristics.
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Dissertations / Theses on the topic "Iridium catalysts"

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Sackville, Emma. "Molecular iridium oxidation catalysts." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767567.

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Oxidation reactions of both inorganic and organic substrates are among the most important chemical transformations, with application in sustainable chemistry and chemical synthesis. A library of half sandwich IrIII oxidation complexes with varying ligands were synthesised (54-78% yield) and fully characterised (NMR, UV-vis, crystal data), in order to investigate the effect on catalyst activity for water and C-H oxidation reactions. The electrochemical transition of IrIII to IrIV was investigated (cyclic voltammetry (CV)) and found to vary between ligand sets, such that alkyl substituted compounds had a lower midpoint potential than aryl substituted. Solution speciation under aqueous conditions was also investigated for all complexes (UV-vis spectroscopy), as well as investigation into catalyst activation by oxidative loss of the pentamethylcyclopentadienyl ligand (1H NMR, UV-vis spectroscopy).The catalytic activity for complexes Ir1-Ir7 was investigated for water oxidation with chemical oxidants, by oxygen evolution assays with a Clark electrode. All complexes evolved oxygen to some extent, with ligand effects causing significant variation in the rate of water oxidation (4.60 mM min-1 to 0.02 mM min-1 with sodium periodate in pure H2O). Mechanistic studies including H/D kinetic isotope effects and reaction progress kinetic analysis showed primary KIEs of 1.3-2.5, indicating O-H cleavage to be in the rate determining step. Determination of the catalyst order revealed an order in iridium of 0.5-0.6 for Ir1-Ir6 and 0.9 for Ir7, which was proposed to be due differences in the activecatalyst species for Ir7.The complexes were also tested for C-H oxidation performance and followed by 1H NMR. The reaction profiles for precatalysts Ir1-Ir7 all showed a plateau conversion with C-H oxidation, varying between 52% - 88%, which was attributed to a competition reaction with water oxidation. The varying ligands impart C-H/water oxidation selectivity onto the catalysts. The C-H oxidation scope was extended by investigations into the oxidation of several terpene-based compounds were also conducted (gas chromatography mass spectrometry, 1H NMR).Comparison of the water oxidation activity of the catalysts as driven by electrochemical potential (as followed by Clark electrode and chronoamperometry) exposed surprising trends that did not correlate with the chemical oxidant data and highlights the importance of reaction conditions when comparing water oxidation activity. Catalyst immobilisation was also attempted with a range of metal oxide supports (indium tin oxide on fluorine doped tin oxide glass, BiVO4, Fe2O3) and analysis of the resulting electrode assessed by CV. Fourier transform alternating current voltammetry (FTACV) was employed in order to investigate the oxidation state of the iridium during electrochemical water oxidation, revealing a clear [Ir] redox transition at the foot of the catalytic wave, proposed to be a key transition to the active catalytic species.
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Fuente, Molina Verònica de la. "Ligand design for palladium and iridium selective catalysts." Doctoral thesis, Universitat Rovira i Virgili, 2011. http://hdl.handle.net/10803/34766.

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This doctoral thesis focuses on the synthesis of new ligands and their application in two types of catalytic process: a) palladium catalysed carbonylation reactions and b) asymmetric reactions (hydrogenation of challenge substrates and C-C bond formation). In the first part of the thesis, the synthesis of a family of new diphosphine ligands and their application in Pd-catalysed carbonylation processes is described. These ligands were first used in the Pd-catalysed methoxycarbonylation of ethane, achieving high activity and selectivity. A mechanistic study on these catalytic systems revealed the resting state of this process. The new ligands were also applied in the aminocarbonylation and double-carbonylation of aryl iodides, achieving high level of chemoselectivity in each case. NMR studies on these systems led to the discovery and development of the first phosphine-free Pd-catalysed double-carbonylation of aryl iodides where the base used in the process revealed to also play a key role as ligand and nucleophile. The second part of this thesis describes the synthesis of new phosphino-imidazoline ligands and their application in the Ir-catalysed asymmetric hydrogenation of unfunctionalised olefines and imines achieving moderate enantioselectivities. These ligands were also applied in the Pd-catalysed allylic substitution reactions, achieving excellent enantioselectivities for a wide range of substrates and nucleophiles. An efficient recovery of the catalytic system was carried out by anchoring a phosphino-imidazoline ligand onto a polymer support or using ionic liquids as reaction medium.
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Salih, Omar Abdullah. "Towards polymer supported iridium borylation catalysts for organic synthesis." Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11715/.

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The first chapter contains a detailed explanation of the borylation of arenes using iridium catalysts with different ligands. Phosphine, N,N-aryl and carbene ligands have been studied previously for the borylation of substituted aromatic and heteroaromatic compounds. The importance of polymer supported catalysts is shown. Examples of polymer supported iridium catalysts for the borylation of arenes are given. Chapter 2 discusses the preparation of 2-arylquinoline and quinolone derivatives. These were prepared by reaction of 3-methoxy and 3,5-dimethoxy aniline with malonic acid to generate the 2,4-dichloro quinoline derivatives. These in turn were then coupled with a range of aryl boronic acids in Suzuki-Miyaura cross-coupling reactions. A study documents the borylation selectivity of 2-(4’-methoxyphenyl)-4-chloro-7-methoxyquinoline 230. Various conditions in Stille cross-coupling reaction were used to prepare nonsymmetrical 4,4’-substituted-2,2’-bipyridine derivatives 250 and 285 in chapter 3. These were prepared through coupling of stannyl pyridine 266 with 2-chloro- and bromo-4-substituted pyridine derivatives in presence of metal salts. Ligands 250 and 285 were evaluated in the borylation of m-xylene and compared to the activity of the literature standard ligand 4,4’-di-tert-butyl-2,2’-bipyridine dtbpy 22. Chapter 4 describes the preparation of 2,4,6-substituted pyridine derivatives. These compounds were prepared by one of two methods. The borylation of 2-chloro-4-substituted pyridine derivatives afforded the corresponding boronate esters, which were then coupled with a range of aryl halides. This was followed by an aromatic nucleophilic substitution reaction with a range of amines. Alternatively, aromatic nucleophilic substitution of 2-chloro-4-substituted pyridine derivatives with amines afforded the corresponding 2-aminopyridines. Subsequent borylation of these subtrates followed by Suzuki-Miyaura cross-copuling was also an effective strategy. Chapter 5 reports the synthesis of symmetrical phenanthroline 347 using the Altman protocol. Attachment of a linker to enable coupling to a polymer support afforded modified ligand 367. Phenanthrolines 347 and 367 were evaluated in the borylation of m-xylene compared to the commercially available 3,4,7,8-tetra-methyl-1,10-phenanthroline tmphen 66. The commercially available MCM-41 was chosen as a suitable polymer for the polymer supported iridium catalyst. Different strategies were investigated to attach the phenanthroline ligand to the polymer. These strategies involved attaching an amine linker to the polymer before coupling it with lithium phenanthroline carboxylate 368. Chapter 6 provides all the experimental details.
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Bode, Kirstin S. "OPTIMIZATION OF IRIDIUM AND RUTHENIUM CATALYSTS IN THE C-H OXIDATION OF ALKANES." Kent State University Honors College / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1620909877637546.

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August, David Philip. "Development of metallosupramolecular photoredox catalysts." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23644.

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Supramolecular chemistry allows the rapid formation of complex systems through self-assembly. These systems often possess unique properties not observed for conventional covalent constructs and have potential applications in areas such as sensing, drug delivery and catalysis. Metallosupramolecular container compounds have been shown to catalyse reactions with both regio- and stereo-selectivity in methods analogous to enzyme type catalysis. Separately, visible-light photoredox catalysis has recently gained considerable interest as an efficient, green and mild method for the rapid synthesis of many chemical compounds. In order to combine the favourable properties of both supramolecular catalysis and visible-light photoredox catalysis, a number of photoredox active metallosupramolecular assemblies were designed, synthesised and analysed. Initial steps were taken to stabilise a known iridium-based M6L4 luminescent cage compound to allow guest encapsulation to take place. The incorporation of isocyanide donors as strong ligands improved the stability of model compounds but synthesis of an analogous three-dimensional assembly was unsuccessful. Instead, a “complex-as-ligand” approach was taken that allowed the straight-forward formation of Pd2L4 systems from a range of photoactive iridium complexes. Importantly, unlike many other photoactive systems, the complexation to palladium did not drastically affect the photoredox properties of the constituent iridium complexes. Multiple approaches were then taken to improve both the stability and guest binding properties of the photoactive assembly in an effort to achieve supramolecular photoredox catalysis. Utilising a model system, a general method was thus developed for enhancing the association constants of neutral guests in organic solvents by switching to large, non-coordinating counter ions that provided reduced competition for the internal binding site. In combination with this increased binding affinity, a range of guest properties were adjusted by association with the hydrogen bond donor environment of the internal cavity. The encapsulation of quinone based oxidants led to unexpected and novel reaction pathways not observed in the bulk phase. As such, this work represents a significant advancement in development of metallosupramolecular systems capable of regio- and stereo-selective photoredox catalysis.
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Leung, Ka Ho. "Oligonucleotide-based lunimescent detection platform utilizing iridium (III) complexes." HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/163.

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Luminescent transition metal complexes have arisen as viable alternatives to organic dyes for sensory applications due to their notable advantages. This thesis aimed to synthesize different kinds of Ir(III) complexes, explore their interactions with DNAs and investigate their application for the construction of label-free oligonucleotide-based sensing platforms. A series of Ir(III) complexes incorporating a variety of C^N and N^N donor ligands were synthesized and were shown to exhibit G-quadruplex-selective binding properties via emission titration, UV/vis titration, fluorescence resonance energy transfer melting and G-quadruplex fluorescent intercalator displacement experiments. These G-quadruplex-selective Ir(III) complexes were utilized as signal transducers to monitor the conformational changes of oligonucleotides in label-free oligonucleotide-based luminescent detection platforms for metal ion (Sr2+), small molecules (GSH and ATP), protein (human neutrophil elastase) and enzyme activities (polymerase, hepatitis C virus NS3 helicase).
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Getton, Frederick P. "Design of metal oxide catalysts." Thesis, Brunel University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314049.

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Lapido, Folami Tesileem. "Oxidative addition of N-H and O-H bonds to iridium: developing active catalysts for N-H and O-H additions to unsaturates." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/39829.

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The oxidative addition of the N-H bond of both heterocyclic and acyclic amines and the O-H bond of phenols, water and carboxylic acids to iridium(I) trimethylphosphines complexes was studied and the reactivity of the resulting hydrido amido-, aryloxo- and carboxylato iridium(III) complexes was investigated. Oxidative addition of the N-H bond of pyrrole, indole, 3-methylindole, 7-azaindole, carbazole and aniline to [Ir(COD)(PMe₃)₃]CI (1a) (COD = 1,5-cyclooctadiene) produces merIr( NR₂)H(PMe₃)₃CI (2a-f) complexes. That these amines were bound to iridium through an Ir-N bond was established by ¹H, ³¹P and ¹³C NMR spectroscopy, IR spectroscopy, C-H analyses and single crystal x-ray diffraction. Similarly, oxidative addition of the O-H bond of phenol, p-cresol, 3,5-dimethylphenol, and water to [Ir(COD)(PMe₃)₃]CI (la) produces mer-Ir(OR)H(PMe₃)₃C1 (5a-c and 6) which were characterized by ¹H, ³¹P and ¹³C NMR spectroscopy, C H analyses and single crystal x-ray diffraction. A preliminary study of the reactivity of both the amido and aryloxo complexes suggests that because of the increased electron affinity of the heteroatoms involved (N or 0), there is high electron density at the heteroatoms in these complexes and therefore the M-N or M-O bond can heterolyze more easily than M-C bonds. This increased tendency of the M-N or M-O bond to heterolyze leads to decomposition reactions when attempts are made to open up a coordination site at the metal center by removing the chloride ligand.
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Jiang, Fan. "New ruthenium and iridium catalysts for transformations involving hydroden transfer." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S170.

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Les activités catalytiques de complexes du ruthénium et de l'iridium ont été examinées dans trois thématiques. De nouvelles phosphines chirales bifonctionnelles à groupement acide et les complexes métalliques correspondants ont été préparés. Nous avons montré que le nouveau ligand (S)-Sulfo-binepine est très efficace pour l'hydrogénation énantiosélective de cétones aromatiques catalysée par le ruthénium et l'hydrogénation énantiosélective de cétiminesaromatiques en présence de catalyseurs de l'iridium. Sur la base d'études mécanistiques, un mécanisme de sphère externe a été proposé pour l'hydrogénation de cétones. Dans le cas de l'hydrogénation de cétimines, les intermédiaires-clés ont été obtenus, ce qui a permis de proposer deux chemins réactionnels compétitifs pour expliquer les effets sur l'énantiosélectivité. Les fonctionnalisations d'amines cycliques sur l'atome d'azote et les carbones en α et β de l'hétéroatome ont été réalisées grâce à des processus de transfert d'hydrogène assistés par des catalyseurs du ruthénium et l'iridium à ligand phosphinesulfonate
In this doctoral thesis, the catalytic activities of new ruthenium and iridium complexes have been examined in three major topics. New chiral phosphine-containing acidic bifunctional ligands and correspondingmetalcomplexes have been prepared. (S)-Sulfo-binepine was shown to be a very efficient novel ligand for ruthenium-catalyzed enantioselective hydrogenation of aryl ketones and iridium-catalyzed enantioselective hydrogenation of arylketimines. Based on mechanistic studies, outer-sphere mechanism was proposed for ketone hydrogenation. For ketimine hydrogenation, the key intermediate and resting species have been obtained, allowing the proposal of two competitive reaction pathways to explain the effects on enantioselectivity. N- and(α,β)-C-functionalization of cyclic amines have been achieved via borrowing hydrogen processes assisted by ruthenium and iridium phosphinesulfonate catalysts
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Le, Trang X. "Oxidation addition of H-H bonds to iridium : developing novel active water soluble catalysts for hydrogenation of unsaturates /." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09232008-144717/.

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Books on the topic "Iridium catalysts"

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Oro, Luis A., and Carmen Claver, eds. Iridium Catalysts for Organic Reactions. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69083-0.

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Homogeneous catalysis with compounds of rhodium and iridium. Dordrecht: D. Reidel Pub. Co., 1985.

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Iridium complexes in organic synthesis. Weinheim: Wiley-VCH, 2009.

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Jobson, Simon. Iron-57 and Iridium-193 Mossbauer studies of supported iron-iridium Fischer-Tropsch catalysts. Birmingham: University of Birmingham, 1990.

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Andersson, Pher G., ed. Iridium Catalysis. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-15334-1.

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Dickson, Ronald S. Homogeneous Catalysis with Compounds of Rhodium and Iridium. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5267-6.

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Andersson, Pher G. Iridium Catalysis. Springer, 2011.

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Andersson, Pher G. Iridium Catalysis. Springer, 2013.

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Oro, Luis A., and Carmen Claver. Iridium Catalysts for Organic Reactions. Springer International Publishing AG, 2022.

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Oro, Luis A., and Carmen Claver. Iridium Catalysts for Organic Reactions. Springer International Publishing AG, 2021.

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Book chapters on the topic "Iridium catalysts"

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Kirchhecker, Sarah, Brian Spiegelberg, and Johannes G. de Vries. "Homogenous Iridium Catalysts for Biomass Conversion." In Iridium Catalysts for Organic Reactions, 341–95. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/3418_2020_72.

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Billig, E., and R. L. Pruett. "By Rhodium and Iridium Catalysts." In Inorganic Reactions and Methods, 367–69. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145319.ch147.

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Oro, Luis A., and Carmen Claver. "Correction to: Iridium Catalysts for Organic Reactions." In Iridium Catalysts for Organic Reactions, C1. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69083-0_74.

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Fernández-Alvarez, Francisco J., and Luis A. Oro. "Correction to: Chapters." In Iridium Catalysts for Organic Reactions, 455–56. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/3418_2020_73.

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Kunz, Doris, and Eva Jürgens. "Strongly Electron Donating Tridentate N-Heterocyclic Biscarbene Ligands for Rhodium and Iridium Catalysts." In Molecular Catalysts, 183–206. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527673278.ch9.

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Crabtree, Robert H. "Introduction and History." In Iridium Catalysis, 1–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15334-1_1.

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Diéguez, Montserrat, Oscar Pàmies, and Carmen Claver. "Iridium-Catalyzed Hydrogenation Using Phosphorus Ligands." In Iridium Catalysis, 11–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15334-1_2.

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Woodmansee, David H., and Andreas Pfaltz. "Iridium-Catalyzed Asymmetric Hydrogenation of Olefins with Chiral N,P and C,N Ligands." In Iridium Catalysis, 31–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15334-1_3.

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Saidi, Ourida, and Jonathan M. J. Williams. "Iridium-Catalyzed Hydrogen Transfer Reactions." In Iridium Catalysis, 77–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15334-1_4.

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Bower, John F., and Michael J. Krische. "Formation of C–C Bonds via Iridium-Catalyzed Hydrogenation and Transfer Hydrogenation." In Iridium Catalysis, 107–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15334-1_5.

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Conference papers on the topic "Iridium catalysts"

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Macchioni, Alceo. "Homogeneous and heterogenized iridium water oxidation catalysts." In SPIE Solar Energy + Technology, edited by Sanjay Mathur. SPIE, 2014. http://dx.doi.org/10.1117/12.2060957.

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

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In the present work, pure iridium oxide (IrO2), and ternary catalysts (IrSnSb-Oxides and RuIrTi-Oxides) are investigated to be used as anode electrocatalysts in The Direct Methanol Fuel Cells (DMFC). Investigations of Methanol Oxidation and Hydrogen Evolution over the catalysts are measured in sulphuric acid as a supportive electrolyte using cyclic voltammetry technique at room temperature (25°C). A specific comparison between the electrocatalytic activities of IrSnSb-Oxides and RuIrTi-Oxides systems is conducted. A comprehensive examination of IrSnSb-Oxides and RuIrTi-Oxides catalysts containing different fractions of the alloying elements are performed to study the effect of varying Iridium Ir content (%) in IrSnSb-Oxides and Ruthenium Ru content (%) in RuIrTi-Oxides on the catalytic activity of ternary catalysts and on the performance of DMFC. It is observed that the electrocatalytic performance of ternary oxides catalysts is strongly dependent on the Ir and Ru content. The generated IrO2 and 33.36% Ru – 1%Ir – 65.64%Ti – Oxides catalysts prove high stability for oxidation of methanol and more proficient electrochemical activity as an anodic electrocatalyst in DMFC at 25°C. The electrochemical measurements of the Hydrogen Evolution Reaction (HER) for metal oxides show that 46.65%Ir – 40.78%Sn – 12.57%Sb sample and 18.75%Ru – 9.35%Ir – 71.9%Ti sample are the superior hydrogen evolution catalysts at 25°C.
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Ghosh, Bankim B., Prokash Chandra Roy, Mita Ghosh, Paritosh Bhattacharya, Rajsekhar Panua, and Prasanta K. Santra. "Control of S.I. Engine Exhaust Emissions Using Non-Precious Catalyst (ZSM-5) Supported Bimetals and Noble Metals as Catalyst." In ASME 2005 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ices2005-1025.

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Three Way Catalysts (TWC) are extensively used for simultaneous control of three principal automotive pollutants, namely carbon monoxide (CO), Oxides of nitrogen (NOx), and hydrocarbon (HC). Most of works on three way catalytic converter have been carried out with noble metals such as Platinum, Rhodium, and Iridium have been tried individually and in different combinations and proportions. Noble metal catalysts give very good performance of reduction of (NOx), CO and HC in the narrow range of stoichiometric Air Fuel ratio. Noble metals are costly and not abundantly available. These draw backs of the noble metal catalysts have inspired to search for the alternative catalysts, which will perform well over the wide range of A/F ratio and are economical and abundantly available. This paper discusses the processing of ZSM-5 to Cu-Ion- Exchanged ZSM-5, ZSM-5 supported Cu-Pt bimetallic catalyst and Cu-Rh bimetallic catalyst and placing them in a three staged converter to study the reduction efficiencies of exhaust emissions CO, NOx, and HC in a 800 cc Maruti S. I. Engine. The experiments are carried out at 1500 rpm, 17.6 A/F ratio, different catalyst bed temperatures and different engine loads 0%, 17.5%, 35%, 52.5%, and 70% of full load. The results achieved are the maximum reduction of CO 90% at 375 °C NOx 90% at 375 °C and HC 61% at 380 °C. The same engine was also run for Noble metal converter (NMC) (EURO-II) purchased from an authorized Maruti distributor and the maximum reduction achieved were CO 89% at 375° C, NOx 91% at 375° C, and HC 70% at 390° C comparable to Zeolite Catalytic Converter (ZCC).
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Malakar, Chandi, Guenter Helmchen, and Richa Gupta. "First Immobilized Catalysts for Iridium- Catalyzed Asymmetric Allylic Amination – Rate Enhancement by Immobilization." In 5th Annual International Conference on Chemistry, Chemical Engineering and Chemical Process (CCECP 2017). Global Science & Technology Forum (GSTF), 2017. http://dx.doi.org/10.5176/2301-3761_ccecp17.26.

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

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In this study, ZSM-5 zeolites were successfully in situ synthesized on the surface of honeycomb cordierite substrate and certified by XRD and SEM techniques. Strong interaction between zeolite and substrate has been found during in-situ synthesis, and hydrothermal stabilities of the zeolites was improved by entailing. The in-situ synthesized monolithic ZSM-5/cordierite showed superior thermal and hydrothermal stabilities. Cu-ZSM-5/cordierite was prepared by ion-exchange and impregnation methods were studied as catalysts for selective catalytic reduction (SCR) of nitrogen oxides (NOx) in a lean-burn gasoline engine. Engine test results show that NOx emission was decreased by reductants of HC and CO in the exhaust gas without any other extra reducing agents. It also exhibited high activities. Using Cu-ZSM-5/cordierite, the maximum NOx conversion efficiency to N2 reached to 64% at the exhaust temperature of 400 °C and the gas hourly space velocity (GHTV) of 25 000/h. Meanwhile, the HC conversion efficiency was about 60%, while CO was little converted. Cu-ZSM-5/cordierite also showed good duration and anti-poison properties. Furthermore, the activated temperature of the Cu-ZSM-5/cordierite was decreased and the NOx conversion was increased via addition of iridium as a modifier.
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Tingkun Gu, Rongshu Zhu, Rong Yang, and Feng Ouyang. "Notice of Retraction: Simultaneous removal of diesel soot particulates and nitrogen oxides over iridium catalysts in the presence of oxygen." In 2010 2nd Conference on Environmental Science and Information Application Technology (ESIAT 2010). IEEE, 2010. http://dx.doi.org/10.1109/esiat.2010.5567361.

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Ganske, G., G. Topalov, E. Slavcheva, W. Mokwa, and U. Schnakenberg. "Sputtered platinum-iridium as catalyst for hydrogen fuel cells." In TRANSDUCERS 2009 - 2009 International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2009. http://dx.doi.org/10.1109/sensor.2009.5285621.

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Depew, Daniel D., and Joseph J. Wang. "Density Functional Theory Investigations on Bulk Iridium Structures for ReaxFF Catalysis Parameterization." In 52nd AIAA/SAE/ASEE Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-4780.

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Koderman Podboršek, Gorazd. "Heating and electrical in situ STEM of titanium oxynitride support for iridium catalyst nanoparticles." In European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.597.

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Scheuerlein, Martin Christoph, and Wolfgang Ensinger. "Electroless Nano-Plating in Ion-track Etched Polymers: Iridium- and Bismuth-coated Membranes for Catalysis and Sensing Applications." In The 6th World Congress on Recent Advances in Nanotechnology. Avestia Publishing, 2021. http://dx.doi.org/10.11159/icnnfc21.lx.109.

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