Bibliographies thématiques / Catalytic C-H

Littérature scientifique sur le sujet « Catalytic C-H »

Auteur : Grafiati
Publié le 6 septembre 2023

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Articles de revues sur le sujet "Catalytic C-H"

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Hilinski, Michael, Shea Johnson et Logan Combee. « Organocatalytic Atom-Transfer C(sp3)–H Oxidation ». Synlett 29, no 18 (27 juin 2018) : 2331–36. http://dx.doi.org/10.1055/s-0037-1610432.

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Predictably site-selective catalytic methods for intermolecular C(sp3)–H hydroxylation and amination hold great promise for the synthesis and late-stage modification of complex molecules. Transition-metal catalysis has been the most common approach for early investigations of this type of reaction. In comparison, there are far fewer ­reports of organocatalytic methods for direct oxygen or nitrogen insertion into C–H bonds. Herein, we provide an overview of early efforts in this area, with particular emphasis on our own recent development of an iminium salt that catalyzes both oxygen and nitrogen insertion.1 Introduction2 Background: C–H Oxidation Capabilities of Heterocyclic Oxidants3 Oxaziridine-Mediated Catalytic Hydroxylation4 Dioxirane-Mediated Catalytic Hydroxylation5 Iminium Salt Catalysis of Hydroxylation and Amination6 Conclusion and Outlook
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Zhang, Hua, et Li Wang. « Metal-Free Catalytic Aromatic C–H Borylation ». Synlett 31, no 19 (11 août 2020) : 1857–61. http://dx.doi.org/10.1055/s-0040-1707241.

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In recent decades, C–H borylation has undergone rapid development and has become one of the most important and efficient methods for the synthesis of organoboron compounds. Although transition-metal catalysis dominates C–H borylation, the metal-free approach has emerged as a promising alternative strategy. This article briefly summarizes the history of metal-free aromatic C–H borylation, including early reports on electrophilic C–H borylation and recent progress in metal-free catalytic intermolecular C–H borylation; it also highlights our recent work on BF3·Et2O-catalyzed C2–H borylation of hetarenes. Despite these recent advances, comprehensive mechanistic studies on various metal-free catalytic aromatic C–H borylations and novel processes with a wider substrate scope are eagerly expected in the near future.
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Kakiuchi, Fumitoshi, et Shinji Murai. « Catalytic C−H/Olefin Coupling ». Accounts of Chemical Research 35, no 10 (octobre 2002) : 826–34. http://dx.doi.org/10.1021/ar960318p.

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Murai, S., F. Kakiuchi, S. Sekine, Y. Tanaka, Asayuki Kamatani, M. Sonoda et Naoto Chatani. « Catalytic C-H/olefin coupling ». Pure and Applied Chemistry 66, no 7 (1 janvier 1994) : 1527–34. http://dx.doi.org/10.1351/pac199466071527.

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Bach, T., A. Nörder, P. Herrmann et E. Herdtweck. « Diastereoselective Catalytic C-H Amination ». Synfacts 2010, no 10 (22 septembre 2010) : 1141. http://dx.doi.org/10.1055/s-0030-1258647.

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Chen, Qing-An, Wei-Song Zhang et Yan-Cheng Hu. « Isoprene : A Promising Coupling Partner in C–H Functionalizations ». Synlett 31, no 17 (2 juillet 2020) : 1649–55. http://dx.doi.org/10.1055/s-0040-1707172.

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Five-carbon dimethylallyl units, such as prenyl and reverse-prenyl, are widely distributed in natural indole alkaloids and terpenoids. In conventional methodologies, these valuable motifs are often derived from substrates bearing leaving groups, but these processes are accompanied by the generation of stoichiometric amounts of by-products. From an economical and environmental point of view, the basic industrial feedstock isoprene is an ideal alternative precursor. However, given that electronically unbiased isoprene might undergo six possible addition modes in the coupling reactions, it is difficult to control the selectivity. This article summarizes the strategies we have developed to achieve regioselective C–H functionalizations of isoprene under transition-metal and acid catalysis.1 Introduction2 Catalytic Coupling of Indoles with Isoprene3 Catalytic Coupling of Formaldehyde, Arenes and Isoprene4 Catalytic Coupling of 4-Hydroxycoumarins with Isoprene5 Catalytic Coupling of Cyclic 1,3-Diketones with Isoprene6 Conclusion and Outlook
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Nishii, Yuji, et Masahiro Miura. « Construction of Benzo-Fused Polycyclic Heteroaromatic Compounds through Palladium-Catalyzed Intramolecular C-H/C-H Biaryl Coupling ». Catalysts 13, no 1 (22 décembre 2022) : 12. http://dx.doi.org/10.3390/catal13010012.

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Dibenzo-fused five-membered heteroaromatic compounds, including dibenzofuran, carbazole, and dibenzothiophene, are fundamental structural units in various important polycyclic heteroaromatic compounds. The intramolecular C-H/C-H biaryl coupling of diaryl (thio)ethers and amines based on palladium(II) catalysis under oxidative conditions is known to be one of the most effective, step-economic methods for their construction. Representative examples for the construction of structurally intriguing π-extended polycyclic heteroaromatics through catalytic coupling reactions are briefly summarized in this mini-review.
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Collet, Florence, Camille Lescot, Chungen Liang et Philippe Dauban. « Studies in catalytic C–H amination involving nitrene C–H insertion ». Dalton Transactions 39, no 43 (2010) : 10401. http://dx.doi.org/10.1039/c0dt00283f.

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Bedford, Robin B., Charlotte J. Mitchell et Ruth L. Webster. « Solvent free catalytic C–H functionalisation ». Chemical Communications 46, no 18 (2010) : 3095. http://dx.doi.org/10.1039/c003074k.

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Young, Andrew J., et M. Christina White. « Catalytic Intermolecular Allylic CH Alkylation ». Journal of the American Chemical Society 130, no 43 (29 octobre 2008) : 14090–91. http://dx.doi.org/10.1021/ja806867p.

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Thèses sur le sujet "Catalytic C-H"

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Leitch, Jamie. « Site selective catalytic C-H functionalisation ». Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767559.

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Harnessing site selectivity in C-H functionalisation remains one of the greatest challenges in modern catalysis. In order to differentiate electronically and sterically similar C-H bonds, a variety of pioneering methods have been developed in recent years. One of the key developments is the use of Lewis basic directing groups to selectively direct a metal centre. The results herein report the manipulation of directing group chemistry to allow selective ortho, meta and para C-H functionalisation of arenes. Chapter 1 reports the developments in moving beyond ortho-selectivity in transition metal catalysed C-H functionalisation chemistry. Chapter 2 reports the use of the biologically relevant oxazolidinone and hydantoin heterocycles as weakly coordinating directing groups in ruthenium catalysed ortho-C-H alkenylation methodology. Chapter 3 reports the application of ruthenium catalysed σ-activation to the remote C-H functionalisation of indoles at the C6 position and carbazoles at the C4 position. Chapter 4 reports the manipulation of site selective cyclometalation and its application in the para-C-H alkylation of aniline derivatives.
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Reynolds, William. « Sequential processes involving catalytic C-H functionalisation ». Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.642028.

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The work described herein involves the exploration of sequential reaction processes involving catalytic C-H functionalisations and Pd-catalysed cross-couplings in both batch and continuous-flow operation, in an effort to improve overall reaction efficiencies.
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Paterson, Andrew. « Selective catalytic C-H functionalisation for drug discovery ». Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720659.

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This thesis details the current methods for meta-selective C-H functionalisation and contains three chapters relating to the area of ruthenium catalysed meta selective functionalisation by σ-activation. The first of which contains a published manuscript entitled “Catalytic meta-selective C-H functionalization to construct quaternary carbon centres” and describes a meta selective tertiary alkylation procedure on 2-phenylpyridine substrates. Key findings from this work provide good evidence for a radical based mechanism and proposes a catalytic cycle involving two distinct roles for the ruthenium catalyst; both in the activation of the substrate molecule and in the formation of a tertiary radical coupling partner. The second chapter contains another published manuscript entitled “Mechanistic insight into ruthenium catalysed meta-sulfonation of 2-phenylpyridine” and provides mechanistic analysis for the meta selective sulfonation of 2-phenylpyridine. Key findings from this work show through stoichiometric experiments that sulfonation occurs at the position para to the C-Ru bond formed following cyclometalation with a radical addition being implied. The work also shows that the catalytic species involved do not require an arene ligand and deuterium labelling studies identified a likely rate limiting radical sulfonation step. The final chapter contains additional work relating to the use of α-halo carbonyl coupling reagents to enable meta selective primary, secondary and tertiary alkylations. The use of a triphenylphosphine ligand source was necessary for the coupling of primary α-halo carbonyl coupling partners at the meta position. Crucially, this transformation was not possible with simple, straight-chain alkyl halides, highlighting the privileged reactivity of α-halo carbonyl coupling reagents. This work also contains experimental and computational mechanistic analysis which reveals additional support for a dual activation pathway.
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Ingner, Fredric. « Preparation of carbazolyne precursors through catalytic C-H functionalization ». Thesis, Uppsala universitet, Organisk kemi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-307497.

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Gallardo, Donaire Juan. « Synthesis of phthalides and benzolactones via catalytic C-H functionalization/C-O bond-forming ». Doctoral thesis, Universitat Rovira i Virgili, 2014. http://hdl.handle.net/10803/276960.

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El objetivo principal de esta tesis doctoral ha sido la activación de enlaces inertes C-H de forma catalítica para la construcción de enlaces C-O. El primer proyecto desarrollado ha consistido en la funcionalización de enlaces C(sp3)-H para la síntesis directa de phthalides catalizado por Pd, utilizando simples ácidos benzoicos como materiales de partida. Continuando con la misma línea de investigación, el segundo proyecto realizado se ha basado en la utilización de catalizadores simples y de bajo coste de Cu para la funcionalización de enlaces C(sp2)-H/formación de enlaces C-O para la síntesis de benzolactonas. Finalmente, se ha desarrollado una metodología libre de metales para la síntesis de benzolactonas generando reactivos hipervalentes de I(III) de forma catalítica.
The main objective of this Thesis has been the activation of inert C-H bonds catalytically for the construction of C-O bonds. The fist project developed consisted on the activation of C(sp3)-H bonds for the direct synthesis of phthalides catalyzed by Pd, employing simple benzoic acids as starting materials. Continuing in the same research line, the second project described deals with the utilization of cheaper and easy to handle Cu salts as catalyst for the functionalization of C(sp2)-H bonds towards the formation of C-O bonds for the synthesis of benzolactones. Finally, the last project discovered handles a metal-free C-H functionalization approach for the synthesis of benzolactones by using simple iodoarenes as catalyst, thus
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Stateman, Leah Marie. « Catalytic Strategies for Remote C-H Functionalization of Alcohols and Amines ». The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587554146078308.

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Wang, Chang-Sheng. « Selective catalytic C(sp²)–H and C(sp³)–H bond functionalizations for the synthesis of phosphorus and nitrogen containing molecules ». Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S106/document.

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Dans la thèse de doctorat, nous avons développé une approche efficace pour la modification rapide d'oxydes d'arylphosphines via la fonctionnalisation de liaisons C-H en position ortho du groupement P=O catalysée par le ruthénium (II) en présence des alcènes. Intéressement, l'ajustement du pH du milieu réactionnel permet de contrôler la sélectivité de la réaction à savoir alkylation or oléfination. La réduction des oxydes de phosphines fonctionnalisées permet la formation d'arylphosphines portant un carboxylate flexible. Dans le second objectif, un couplage C(sp3)–H /N-H oxydatif catalysé par le cuivre a permis l'alkylation d'hétérocycles à partir de (cyclo alcanes abordables. Ce protocole implique la formation de liaisons C (sp3)–N via une voie radicalaire générée par un clivage homolytique du peroxyde de di-tert-butyle et le piégeage du ou des radicaux par des catalyseurs au cuivre. Dans une troisième partie, nous avons utilisé ces processus radicalaires pour la fonctionnalisation le liassions C(sp3)–H benzylique d'oxyde de 2-alkylpyridines. Ces transformations impliquent un processus en cascade : estérification oxydative catalysée par le cuivre suivie d'un transfert d'atome d'oxygène. Enfin, des dérivés tosylés de pyridin-2-ylméthyl ont été obtenus avec des rendements élevés à partir des oxide de 2-alkylpyridines grâce à un réarrangement sigmatropic [3,3] du produit d'addition entre les oxides de 2-alkylpridine avec des chlorures de chlorure de benzènesulfonyles. De plus, les alkylnitrones subissent également ce réarrangement sigmatropique [3,3] pour donner des cétones α-tosylées après hydrolyse
In the first chapter, we have developed an efficient approach for the fast modification of arylphosphine oxides using ruthenium(II)-catalyzed C–H bond functionalization with alkenes. Interestingly, we have found that the selectivity of the reaction, namely alkylation versus alkenylation, is depending on the reaction pH. The reduction of the phosphine oxide allows the formation of aryl phosphines bearing a flexible pendent carboxylate. In the second objective, a copper-catalyzed oxidative C(sp3)–H/N–H coupling of NH-heterocycles with affordable (cyclo)alkanes was developed. This protocol involved C(sp3)–N bond formation via a radical pathway generated by a homolytic cleavage of di-tert-butyl peroxide and trapping of the radical(s) by copper catalyst.In a third part, benzylic C(sp3)–H acyloxylation of 2-alkylpyridine, 2-alkylpyrazine and 2-alkylthiazole compounds was achieved using simple aldehydes via a copper-catalyzed tandem reaction, involving oxidative esterification followed by O-atom transfer. Finally, pyridin-2-ylmethyl tosylate derivatives are obtained in high yields from 2-alkylpyridine N-oxides via a [3,3]-sigmatropic rearrangement of the adduct between 2-alkylpridine N-oxides with benzenesolfonyl chlorides. Moreover, alkylnitrones also underwant [3,3]-sigmatropic rearrangement to give α-tosylated ketones after hydrolysis
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Gerdes, Gerd. « Catalytic C-H activation of benzene by plantinum(II) : a mechanistic study / ». Zürich, 2004. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=15631.

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Sankey, Rosalind Fay. « Beyond C-H activation : the preparation of novel heterocycles using catalytic dearomatisation ». Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.559388.

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The continuous drive for efficient bond forming reactions has led to the emergence of C-H activation methodologies. More specifically, direct arylation reactions are commonly employed in the synthesis of a range of heteroaromatic products. The latter make up a considerable proportion of medicinally important compounds and therefore their rapid and efficient synthesis is paramount. The preparation of carbazoles has been extensively developed within the Bedford group. The expansion of this palladium-catalysed intramolecular direct arylation methodology has been explored with the aim of producing interesting heterocycles, namely acridans and acridines. Interestingly, instead of the expected C-H activation reaction, an unprecedented catalytic dearomatisation reaction took place. This was developed into a more general methodology to produce a range of novel heterocycles, including 4a-alkyl-4aH- carbazoles and dihydroindolo[2,3-b]indoles. Due to their instability these heterocycles undergo a range of interesting transformations, including dimerisation, dealkylation and hydro lysis reactions. Furthermore, it was proposed that typical direct arylation reactions could be occurring via a catalytic dearomatisation mechanism rather than one of the more generally accepted C-H activation mechanisms. A detailed kinetic study has been carried out. Although evidence to support a dearomatisation mechanism could not be obtained, the turnover-limiting step for two substrates could be proposed and a number of interesting observations made.
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Khan, Imtiaz. « Enolate-directed catalytic C-H functionalization of 2-aryl-1,3-dicarbonyl compounds ». Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/30261/.

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I) Synthesis of Spiroindenes by Enolate-Directed Ruthenium-Catalyzed Oxidative Annulation of Alkynes with 2-Aryl-1,3-dicarbonyl Compounds The synthesis of carbocycles by the ruthenium-catalyzed oxidative annulation of alkynes with 2-aryl cyclic 1,3-dicarbonyl substrates is described. Proceeding by the functionalization of C(sp3)–H and C(sp2)–H bonds, and the formation of all-carbon quaternary centers, the reactions provide a diverse range of spiroindenes in good yields and high levels of regioselectivity. II) Synthesis of Benzopyrans by Pd(II)- or Ru(II)-Catalyzed C–H Alkenylation of 2-Aryl-3-hydroxy-2-cyclohexenones We have explored the 2-aryl-3-hydroxy-2-cyclohexenones as competent substrates for palladium- and ruthenium-catalyzed C–H alkenylation reactions with terminal alkenes. This process affords benzopyrans, in most cases, with good functional group tolerance. III) Synthesis of Spiroindanes by Palladium-Catalyzed Oxidative Annulations of 1,3-Dienes Involving C–H Functionalization 1,3-Dienes have been an underexplored class of substrates in catalytic oxidative annulation reactions involving C‒H functionalization. The synthesis of spiroindanes by the palladium-catalyzed oxidative annulation of 1,3-dienes with 2-aryl cyclic 1,3-dicarbonyl compounds is described. Several examples of the dearomatizing oxidative annulation of 1,3-dienes with 1-aryl-2-naphthols are also presented. IV) Enantioselective Spiroindene Formation via C‒H Functionalization Using Chiral Cyclopentadienyl Rhodium Catalysts A chiral cyclopentadienyl rhodium ligand with an atropchiral biaryl backbone enables an asymmetric synthesis of spiroindenes from 2-aryl-1,3-dicarbonyl compounds and alkynes. The process affords a range of products with all-carbon quaternary center in high yields and excellent enantiselectivities. The good functional group tolerance and broad substrate generality are the advantages of this reaction.
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Livres sur le sujet "Catalytic C-H"

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Dixneuf, Pierre H., et Henri Doucet, dir. C-H Bond Activation and Catalytic Functionalization II. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29319-6.

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Dixneuf, Pierre H., et Henri Doucet, dir. C-H Bond Activation and Catalytic Functionalization I. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24630-7.

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Jacques, Teresa. I : Catalytic Direct C-H Arylation of Pyrazoles. II : Toward Modulation of Neuroplasticity with Small Molecules. [New York, N.Y.?] : [publisher not identified], 2013.

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Pérez, Pedro J., dir. Alkane C-H Activation by Single-Site Metal Catalysis. Dordrecht : Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-3698-8.

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Bergeld, Johan. Thermo- and photostimulated reactions of H₂O, O₂, and CO on Pt(111) and C(0001) surfaces. Göteborg : Göteborg University, Department of Physics, 2007.

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Catalytic Transformations Via C-H Activation 1. Thieme Verlag, George, 2016.

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Dixneuf, Pierre H., et Henri Doucet. C-H Bond Activation and Catalytic Functionalization II. Springer London, Limited, 2016.

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Dixneuf, Pierre H., et Henri Doucet. C-H Bond Activation and Catalytic Functionalization II. Springer, 2016.

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Dixneuf, Pierre H., et Henri Doucet. C-H Bond Activation and Catalytic Functionalization I. Springer, 2018.

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Dixneuf, Pierre H., et Henri Doucet. C-H Bond Activation and Catalytic Functionalization I. Springer London, Limited, 2015.

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Chapitres de livres sur le sujet "Catalytic C-H"

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Tomin, Anna, Seema Bag et Béla Török. « Catalytic CH Bond Activation Reactions ». Dans Green Techniques for Organic Synthesis and Medicinal Chemistry, 67–97. Chichester, UK : John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9780470711828.ch4.

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Ghosh, Pradip, Marc-Etienne Moret et Robertus J. M. Klein Gebbink. « Catalytic Oxygenation of CC and CH Bonds ». Dans Non-Noble Metal Catalysis, 355–89. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527699087.ch14.

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Li, Jie, Suman De Sarkar et Lutz Ackermann. « meta- and para-Selective C–H Functionalization by C–H Activation ». Dans C-H Bond Activation and Catalytic Functionalization I, 217–57. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_130.

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Kakiuchi, Fumitoshi, et Shinji Murai. « Activation of C-H Bonds : Catalytic Reactions ». Dans Activation of Unreactive Bonds and Organic Synthesis, 47–79. Berlin, Heidelberg : Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-68525-1_3.

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Kakiuchi, Fumitoshi. « Catalytic Addition of C – H Bonds to C – C Multiple Bonds ». Dans Topics in Organometallic Chemistry, 1–33. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/3418_2007_064.

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Liu, Zhanxiang, et Yuhong Zhang. « Catalytic C-H Bond Cleavage for Heterocyclic Compounds ». Dans Green Techniques for Organic Synthesis and Medicinal Chemistry, 131–59. Chichester, UK : John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781119288152.ch7.

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Sustac Roman, Daniela, et André B. Charette. « Catalytic C–H Bond Functionalization of Cyclopropane Derivatives ». Dans Topics in Organometallic Chemistry, 91–113. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_118.

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Dana, Suman, M. Ramu Yadav et Akhila K. Sahoo. « Ruthenium-Catalyzed C−N and C−O Bond-Forming Processes from C−H Bond Functionalization ». Dans C-H Bond Activation and Catalytic Functionalization I, 189–215. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_126.

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Wencel-Delord, Joanna, Frederic W. Patureau et Frank Glorius. « Rh(III)- and Ir(III)-Catalyzed C–C Bond Cross Couplings from C–H Bonds ». Dans C-H Bond Activation and Catalytic Functionalization I, 1–27. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_140.

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Dailler, David, Grégory Danoun et Olivier Baudoin. « Applications of Catalytic Organometallic C(sp3)–H Bond Functionalization ». Dans Topics in Organometallic Chemistry, 133–53. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/3418_2015_122.

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Actes de conférences sur le sujet "Catalytic C-H"

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SANFORD, MELANIE. « CONTROLLING SELECTIVITY AND REACTIVITY IN CATALYTIC C–H FUNCTIONALIZATION REACTIONS ». Dans 24th International Solvay Conference on Chemistry. WORLD SCIENTIFIC, 2018. http://dx.doi.org/10.1142/9789813237179_0003.

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Lian, T., S. E. Bromberg, H. Yang, M. Asplund, R. G. Bergman et C. B. Harris. « Femtosecond IR Studies of Alkane C-H Bond Activation by Organometallic Compounds ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.fe.27a.

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The mechanism of alkane C-H bond activation by transition metal complexes such as CpM(CO)2 (M=Rh, Ir) has been intensely studied because it represents a first step in a catalytic process using unreactive hydrocarbons.[1] The bond activation reaction starts with the formation of monocarbonyl intermediates such as CpRh(CO). These species have been detected in the gas phase[2] and in liquefied rare Kr and Xe[3] by µs time resolved IR spectroscopy. Unfortunately, the subsequent oxidative insertion of CpRh(CO) into the C-H bond is not well understood due to its rapid rate and low quantum yield (~1%) for formation of the C-H activated product. These properties have hindered previous femtosecond and picosecond time-resolved studies of activation reaction in room temperature alkane solution. [4]
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Le, Anh Ngoc Tram, Hung Hoa Lam, Tuyet Mai Tran Thuy, Long Quang Nguyen, Ngo Tran Hoang Duong, Thuan Minh Nguyen et Dung Van Nguyen. « Facile Preparation of Multifunctional Ag-Fe<sub>x</sub>O<sub>y</sub>/C Composite from Coffee Husk for Antibacterial and Catalytic Applications ». Dans 5th International Conference on Advanced Materials Science. Switzerland : Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-58b9m3.

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In this research, FexOy/C was first prepared through one-step pyrolysis of FeCl3-coffee husk mixture. The surface of FexOy/C was then loaded with Ag particles using an ex-situ method, producing Ag-FexOy/C. XRD result indicates that different crystals of Fe3O4, Fe2O3, and FeO(OH) were formed on the surface of porous carbon. The existence of 0.41 wt% Ag and 3.13 wt% Fe was determined by AAS results. Subsequently, Ag-FexOy/C was primarily explored for its antibacterial and catalytic applications. According to the ASTM E2149-13a standard, the material killed 62% of Staphylococcus aureus within 60 min of contamination. For catalytic performance, 50 ppm sunset yellow FCF was decolorized by 240 ppm H2O2 using 0.40 g/L Ag-FexOy/C at pH 3.0. The results showed that Ag-FexOy/C had an adsorption capacity of 7.8 mg/g and an average decolorization rate of 41.6 mg.g-1.h-1. This rate was approximately 13-fold higher than that without a catalyst. Furthermore, Ag-FexOy/C with a saturation magnetization of 3.62 emu/g was separated and recovered easily from the treated mixture by a magnet bar. Overall, the findings initially prove that Ag-FexOy/C is a promisingly multifunctional material, thanks to its antibacterial activity, adsorption capacity, catalytic activity and magnetic recoverability.
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Hui, K. S., et Christopher Y. H. Chao. « Conversion of Coal Fly Ash Into Zeolite 4A and Its Applications in Waste Water Treatment and Greenhouse Gas Reduction ». Dans ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41361.

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This study applied a novel conversion method to convert coal fly ash (CFA) into pure form (without mixture of CFA residue), single phase and high crystalline zeolite 4A. This novel conversion method allows a reduction by half of the total conversion time while maintaining a high degree of crystallinity of zeolite 4A which exists in a narrower particle size distribution. Applications of the CFA converted zeolite 4A (C4A) in waste water treatment of multi-heavy-metal-ions and in catalytic methane combustion were evaluated. In waste water treatment, for C4A and commercial zeolite 4A, the equilibrium sorption data were well fitted by the Langmuir model and showed the affinity order: Cu2+ &gt; Cr3+ &gt; Zn2+ &gt; Co2+ &gt; Ni2+. Compared to commercial zeolite 4A, the C4A and the treated CFA residue (TCFAR) were effective in removing multi-heavy-ions in water and could be an alternative material for treatment of wastewater. In catalytic methane combustion, post-treatment of C4A was performed to enhance catalytic activity of the catalyst. Catalytic methane combustion was conducted at atmospheric pressure and gas hourly space velocity (GHSV) between 3230 and 16150 h−1 under different lean fuel concentrations (equivalence ratio of 0.1–0.4) at 500 °C. Thermogravimetry analysis (TGA) results showed the catalyst (M(250)-C4A) could be operated at a temperature of 700 °C without damage to the zeolite structure. At 500 °C, higher combustion efficiency was achieved by either reducing the GHSV under the same fuel concentration or reducing the fuel concentration under the same GHSV. Comparing to a commercial catalyst 2%Pd/Al2O3, the catalyst (M(250)-C4A) achieved a higher methane conversion % in the GHSV range of 3230–9690 h−1. Finally, economic and environmental aspects of converting CFA to zeolite 4A were discussed.
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Cirujano, Francisco. « Ionic liquids vs. microporous solids as reusable reaction media for the catalytic C–H functionalization of indoles with alcohols ». Dans The 22nd International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2018. http://dx.doi.org/10.3390/ecsoc-22-05655.

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Yin, Sudong, Yanglin Pan et Zhongchao Tan. « Catalytic Hydrothermal Conversion of Glucose to Light Petroleum Alkanes ». Dans ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90433.

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The production of carbon-neutral liquid fuels from renewable biomass has attracted worldwide interest in an age of depletion of fossil fuel reserves and pollutions caused by utilization of fossil petroleum. Currently, commercial bio-oil production technologies include bio-ethanol, bio-diesel and pyrolysis bio-oil. But, these bio-oils mainly consist of alcohols and aromatic chemicals rather than alkanes of the main components of gasoline and diesel. Direct utilization of these bio-oils can corrode car engines as well as emitting large unburned hydrocarbons particles through automotive combustion system. Therefore, in this study, catalytic hydrothermal conversion (CHTC) of glucose to alkanes in a single batch reactor was investigated with respect to effects of conversion parameters such as initial pressure of process gas H2, pH level of aqueous solution and catalysts on alkane yields and compositions. Results showed that the highest alkane yield of 21.6% (based on the mol of the input glucose) was obtained at 265 °C, with 300 psi of H2 process gas, 0.5 g catalyst of 1w%. Pt/Al2O3 and a residence time of 15 h. The alkane yield was significantly influenced by the initial pressure of H2, which increased with increasing H2 pressure. On the other hand, the alkane yields first increased and then decreased with pH levels. Also, more alkanes were produced by Pt/Al2O3 than Pd/Al2O3. Regarding alkane compositions, high initial pressure of H2 favored the production of relatively heavy C3–4 alkanes. With 300 psi of initial H2, C3H8 and C4H10 accounted for 75% of the total produced alkanes. All of the experimental data in this study lead to one conclusion that petroleum alkanes can be directly produced from glucose.
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Dumeignil, Franck, Benjamin Katryniok et Negissa Ebadi Pour. « Glycerol polymerization over stable and selective calcium hydroxyapatite ». Dans 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/dpka8345.

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High catalytic activity and large availability of Ca-based catalysts make them particulartly attractive for the glycerol polymerization reaction. However, this kind of catalyts usually suffers from a poor stability under the reactions conditions. We present herein the use of Ca-hydroxyapatites (HAps), a very abundant Ca source in the nature, as glycerol polymerization catalysts combining high performance in terms of selectivity and high resistance to deactivation by leaching. We have synthesized, characterized and tested Ca-rich, stochiometric and Ca-deficient HAps. The two latter ones were fully selective to triglycerol at a glycerol conversion of 15 %, at 245 °C after 8 h in the presence of 0.5 mol.% of catalyst. Under the same reaction conditions, the Ca-rich HAp was highly selective to di- and triglycerol (88 %) at a glycerol conversion of 27 %. All the catalysts proved to be stable with negligible Ca species leaching according to the ICP-OES results.
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Chen, Guanyi, Qiang Li, Xiaoyang Lv, Na Deng et Lifei Jiao. « Production of Hydrogen-Rich Gas Through Pyrolysis of Biomass in a Two-Stage Reactor ». Dans ASME Turbo Expo 2004 : Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53582.

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Biomass is quite abundant in the world, particularly in some countries like China. China has large quantities of straw and/or stalk-origin biomass resources and the attention is currently being paid to the exploitation of these resources to produce energy products via different technical solutions, among of which pyrolysis of biomass to produce hydrogen-rich gas is very promising as hydrogen is a very clear energy carrier. In this work, pyrolysis of rice straw, corn stalk and sawdust was carried out in a two-stage reactor (the first-stage reactor is a conventional fixed-bed pyrolyser, and the second-stage reactor is a catalytic fixed bed) to produce hydrogen-rich gas. The effect of catalytic bed on the pyrolysis behaviour have been investigated, with the emphasis on final product particularly hydrogen. The operation of the catalytic reactor appears significant in promoting biomass pyrolysis towards the production of gaseous products, especially hydrogen. At 750°C of the pyrolyser with rice straw as fuel, the use of the catalytic bed leads to the increases of gas yield from 0.41 Nm3/kg to 0.50 Nm3/kg, approximately 22% increase, and of H2 concentration from 33.79% to 50.80% in volume, approximately 50.3% increase, respectively. Compared with calcined dolomite, fresh nickel-based catalyst shows stronger catalytic effect on the pyrolysis of rice straw as its use in the catalytic bed results in the increase of gas yield from 0.41 Nm3/kg to 0.56 Nm3/kg, approximately 36.6% increase, and the increase of H2 concentration from 33.79% to 59.55% in volume, approximately 76.2% increase. Furthermore, two catalysts follow the same trend for the pyrolysis of corn stalk and sawdust. At temperature of 815°C, catalysts also follow the same trend. Catalytic bed can significantly reduce the level of tar which is carried out with the producer gas, to less than 1% of original level. Catalyst load or gas space velocity (hourly) has the influence on the gas yield and H2 concentration. 30% of load, i.e. gas space velocity (hourly) 0.9 × 104 h−1, appears reasonable. Beyond that, gas yield and H2 concentration remain almost unchanged.
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Davison, Evan, Jessica Otto, Sandeep Kumar et Randy Maglinao. « Production of Branched Esters via Continuous Alkylation of Fatty Acid Methyl Esters over Montmorillonite and h-zsm5 Catalysts ». Dans 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/ezak5028.

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Abstract: Lignocellulosic and waste from the food industry offers a sustainable way to produce alternative transportation fuel and provide fiber and biomaterial. Thermochemical processes can depolymerize lignin into its phenolic monomers which can be upgraded to aromatic hydrocarbons. Fatty acids from food wastes have functional groups to accommodate selective synthesis of chemicals. These characteristics could be utilized as sustainable high-value additive products for fuels and lubricating oils. In the present study, an effective lubricity additive was synthesized via continuous alkylation of fatty acid methyl esters with aromatic hydrocarbons. A continuous fixed-bed reactor operated at atmospheric pressures was used. Acid-treated montmorillonite and H-ZSM5 were used as catalysts. The effects of the various catalysts on the liquid product composition were investigated while keeping other reaction conditions constant. An improved catalytic activity was achieved in montmorillonite catalyst compared to H-ZSM5 catalysts. The alkylation of fatty acid methyl esters with aromatic hydrocarbons over montmorillonite and alumina-supported Ni catalysts occurred at 200-210 °C.
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Amama, Placidus B., Jonathan E. Spowart, Andrey A. Voevodin et Timothy S. Fisher. « Modified Magnesium Hydride and Calcium Borohydride for High-Capacity Thermal Energy Storage ». Dans ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44133.

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MgH2 and Ca(BH4)2 are potential thermal energy storage (TES) materials that possess extraordinarily high inherent thermal energy densities of up to 2 MJ/kg. However, the high desorption temperatures at atmospheric pressure [>300°C for Ca(BH4)2, >400°C for MgH2] coupled with slow kinetics represent significant challenges for their use in TES. In order to address these challenges, the present work focuses on the development of new modification approaches based on nanostructuring via high-energy vibratory ball milling and catalytic enhancement using pure Ni and Ni alloys. Our work reveals that high-energy vibrating-mill technique with ball-to-powder weight ratio as low as 13:1can produce MgH2 powders with nanocrystallites after 2h of milling. MgH2 milled with Ni (5 wt%) and Ni5Zr2 (5 wt%) catalysts for 2 h showed apparent activation energies, EA of 81 and 79 kJ/mol, respectively, corresponding to ∼50% decrease in EA and ∼100°C decrease in the decomposition temperature (Tdec). On the other hand, the decomposition reaction of Ca(BH4)2 does not seem to be catalyzed by the Ni-based catalysts tested.
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Rapports d'organisations sur le sujet "Catalytic C-H"

1

Crabtree, Robert. Moving to Sustainable Metals : Multifunctional Ligands in Catalytic, Outer Sphere C-H, N-H and O-H Activation. Office of Scientific and Technical Information (OSTI), mars 2015. http://dx.doi.org/10.2172/1171638.

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