Bibliografias temáticas / Carbène NHC

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Literatura científica selecionada sobre o tema "Carbène NHC"

Autor: Grafiati

Publicado: 8 de junho de 2024

Última modificação: 31 de julho de 2025

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Artigos de revistas sobre o assunto "Carbène NHC"

Alauddin, Mohammad, and Mazharul M. Islam. "A computational characterization of N-heterocyclic carbenes for catalytic and nonlinear optical applications." Zeitschrift für Naturforschung B 79, no. 4 (2024): 215–23. http://dx.doi.org/10.1515/znb-2023-0092.

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Abstract Very recently, N-heterocyclic carbenes (NHCs) have found a wide range of applications in the fields of catalysis and nonlinear optics. Herein, we have employed 1,3-bis-(1(S)-benzyl)-4,5-dihydro-imidazol-based carbene as a reference molecule and substituted one H atom from each CH2 of the benzyl groups in both sides by CH3, NH2, and CF3 to study the thermodynamic and opto-electronic properties of NHCs theoretically. It was observed that the enthalpy (H), Gibb’s free energy (G), specific heat capacity (C v), and entropy (S) increase significantly in the presence of the electron-withdraw

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Mokfi, Moloud, Jörg Rust, Christian W. Lehmann, and Fabian Mohr. "Facile N9-Alkylation of Xanthine Derivatives and Their Use as Precursors for N-Heterocyclic Carbene Complexes." Molecules 26, no. 12 (2021): 3705. http://dx.doi.org/10.3390/molecules26123705.

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The xanthine-derivatives 1,3,7-trimethylxanthine, 1,3-dimethyl-7-benzylxanthine and 1,3-dimethyl-7-(4-chlorobenzyl)xanthine are readily ethylated at N9 using the cheap alkylating agents ethyl tosylate or diethyl sulfate. The resulting xanthinium tosylate or ethyl sulfate salts can be converted into the corresponding PF6- and chloride salts. The reaction of these xanthinium salts with silver(I) oxide results in the formation of different silver(I) carbene-complexes. In the presence of ammonia, ammine complexes [Ag(NHC)(NH3)]PF6 are formed, whilst with Et2NH, the bis(carbene) salts [Ag(NHC)2]PF6

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Longevial, Jean-François, Mamadou Lo, Aurélien Lebrun, Danielle Laurencin, Sébastien Clément, and Sébastien Richeter. "Molecular complexes and main-chain organometallic polymers based on Janus bis(carbenes) fused to metalloporphyrins." Dalton Transactions 49, no. 21 (2020): 7005–14. http://dx.doi.org/10.1039/d0dt00594k.

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Janus bis(N-heterocyclic carbenes) composed of a porphyrin core with two N-heterocyclic carbene (NHC) heads fused to opposite pyrroles were used as bridging ligands for the preparation of metal complexes.

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Jutand, Anny, Julien Pytkowicz, Sylvain Roland, and Pierre Mangeney. "Mechanism of the oxidative addition of aryl halides to bis-carbene palladium(0) complexes." Pure and Applied Chemistry 82, no. 7 (2010): 1393–402. http://dx.doi.org/10.1351/pac-con-09-09-22.

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Bis-N-heterocyclic carbenes Pd0 complexes, Pd0(NHC)2, are efficient catalysts in Heck reactions performed with aryl bromides or chlorides. The Pd0(NHC)2 that are not stable are generated in situ from PdII precursors PdY2(NHC)2 (Y = halides) after a chemical reduction. The latter procedure can be mimicked by an electrochemical reduction. The transient Pd0(NHCBn)2 is generated by electrochemical reduction of PdY2(NHCBn)2, and its reactivity in oxidative addition to aryl bromides and chlorides is characterized by the same electrochemical technique with the determination of the rate constants. Pd0

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Elvan, Üstün, and Şahin Neslihan. "Molecular docking analysis of N-heterocyclic carbene and silver N-heterocyclic carbene complexes with thioredoxin reductas." Journal of Indian Chemical Society Vol. 97, No. 10c, Oct 2020 (2020): 2013–16. https://doi.org/10.5281/zenodo.5970121.

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Department of Chemistry, Faculty of Art and Science, Ordu University, 52200 Ordu, Turkey Department of Basic Education, Faculty of Education, Cumhuriyet University, 58140 Sivas, Turkey E-mail: elvanustun@odu.edu.tr Manuscript received online 20 October 2020, revised and accepted 31 October 2020 Molecular docking is a frequently used method in computer-supported drug design studies. It is possible to obtain useful information about the magnitude and character of the interaction between known targets and bioactive molecules thanks to docking methods. Besides the well-known anti

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Nonnenmacher, Michael, Dominik M. Buck, and Doris Kunz. "Experimental and theoretical investigations on the high-electron donor character of pyrido-annelated N-heterocyclic carbenes." Beilstein Journal of Organic Chemistry 12 (August 23, 2016): 1884–96. http://dx.doi.org/10.3762/bjoc.12.178.

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Rh(CO)2Cl(NHC) complexes of dipyrido-annelated N-heterocyclic carbenes were prepared. From the C–H coupling constant of the respective imidazolium salts and the N–C–N angle of the N-heterocyclic carbene (NHC), a weaker σ-donor character than that of typical unsaturated NHCs is expected. However, the IR stretching frequencies of their Rh(CO)2Cl complexes suggest an electron-donor character even stronger than that of saturated NHCs. We ascribe this to the extremely weak π-acceptor character of the dipyrido-annelated NHCs caused by the conjugated 14 πe− system that thus allows for an enhanced Rh–

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Qie, Boyu, Ziyi Wang, Jingwei Jiang, et al. "Synthesis and characterization of low-dimensional N-heterocyclic carbene lattices." Science 384, no. 6698 (2024): 895–901. http://dx.doi.org/10.1126/science.adm9814.

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The covalent interaction of N-heterocyclic carbenes (NHCs) with transition metal atoms gives rise to distinctive frontier molecular orbitals (FMOs). These emergent electronic states have spurred the widespread adoption of NHC ligands in chemical catalysis and functional materials. Although formation of carbene-metal complexes in self-assembled monolayers on surfaces has been explored, design and electronic structure characterization of extended low-dimensional NHC-metal lattices remains elusive. Here we demonstrate a modular approach to engineering one-dimensional (1D) metal-organic chains and

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Ojha, Minita, Shweta Choudhary, and Raj K. Bansal. "3-Benzylbenzothiazolylidene Carbene Catalyzed Isomerization of Dimethyl Maleate to Dimethyl Fumarate: Experimental and Theoretical Results." Current Organocatalysis 7, no. 2 (2020): 108–17. http://dx.doi.org/10.2174/2213337206666191018111354.

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Background: N-Heterocyclic Carbenes (NHCs) have emerged as ubiquitous species having applications in a broad range of fields, including organocatalysis and organometallic chemistry. Since Arduengo and co-workers first isolated a bottlable NHC, namely imidazol-2-ylidene derivative, these nucleophilic species have attained a prominent place in synthetic organic chemistry. The NHC-induced non-asymmetric catalysis has turned out to be a really fruitful area of research in recent years. Methods and Results: The quantitative aspects of the experimental and theoretical investigation of isomerization

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Zhu, Tingshun, Ke Xu, and Ziyuan Wang. "N-Heterocyclic Carbene-Organocatalyzed Arene Formation: Application in Atroposelective Synthesis of Polysubstituted Benzenes." Synlett 31, no. 10 (2020): 925–32. http://dx.doi.org/10.1055/s-0039-1690814.

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In recent decades, organocatalysis by N-heterocyclic carbenes (NHCs) has emerged as a versatile and powerful method in organic synthesis. As a result of the power of NHC organocatalysis to produce cyclic compounds, polysubstituted benzenes, which are among the most important cyclic compounds in organic chemistry, can be synthesized efficiently and selectively. This article briefly summarizes the history of NHC organocatalysis, including recent developments in benzene-formation methods, and highlights our recent work in atroposelective arene formation by carbene-catalyzed formal [4+2] cycloadd

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Rey, Yannick P., and Ryan Gilmour. "Modulating NHC catalysis with fluorine." Beilstein Journal of Organic Chemistry 9 (December 6, 2013): 2812–20. http://dx.doi.org/10.3762/bjoc.9.316.

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Fluorination often confers a range of advantages in modulating the conformation and reactivity of small molecule organocatalysts. By strategically introducing fluorine substituents, as part of a β-fluoroamine motif, in a triazolium pre-catalyst, it was possible to modulate the behaviour of the corresponding N-heterocyclic carbene (NHC) with minimal steric alterations to the catalyst core. In this study, the effect of hydrogen to fluorine substitution was evaluated as part of a molecular editing study. X-ray crystallographic analyses of a number of derivatives are presented and the conformation

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Teses / dissertações sobre o assunto "Carbène NHC"

Haumesser, Julien. "Synthèse et caractérisation d'assemblages multi-porphyriniques à espaceurs NHC." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-01017421.

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L'objectif de cette thèse a été de mettre au point l'introduction d'azoles en meso d'une porphyrine par couplage d'Ullmann; Divers azoles ont pu être introduit par cette méthode avec de bons rendements, par formation d'une liaison carbone-azote. il a même été possible avec certains azotes de réaliser des doubles couplages d'Ullmann, conduisant ainsi à des 5.15-diazolyle-porphyrines. De plus, ces même conditions réactionnelles ont été utilisées pour introduire un ou deux dérivés donneurs d'électrons (carbazole, phénoxazine, phénothiazine). L'introduction d'imidazole, de triazole et de benzimida

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Fernandez, de Larrinoa Patricia. "Synthèse et formulation de complexes NHC-platine ciblant la mitochondrie pour combattre le glioblastome." Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF037.

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Le glioblastome est la tumeur cérébrale la plus agressive avec un pronostic fatal, principalement à cause des cellules souches cancéreuses. Les médicaments à base de platine, utilisés pour traiter d’autres types de cancers, sont limités par l’apparition d’effets secondaires et le développement de résistances.Les complexes de platine à base de carbène N-hétérocyclique (NHC-Pt) ont été récemment identifiés comme des options thérapeutiques potentielles pour le traitement du glioblastome. Leur efficacité a été démontrée in vitro et in vivo pour éradiquer les cellules souches de glioblastome en cib

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Kong, Lingyu. "De ligands NHCs prochiraux à des complexes métal-NHC énantiopurs : nouvelles perspectives pour la catalyse asymétrique." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0502.

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Les carbènes N-hétérocycliques (NHC) sont connus pour être de bons ligands des métaux de transition (TM). Dans ce manuscrit, le premier chapitre est consacré une présentation non exhaustive des différentes approches qui ont été utilisées dans la littérature pour le design de NHCs chiraux efficaces en catalyse enantiosélective. Au début du deuxième chapitre, le nouveau concept est présenté. Celui-ci repose sur la formation d’un axe de chiralité qui est créé lors de la coordination du ligand NHC à un métal de transition. Ce chapitre est consacré à la synthèse de complexes possédant une symétrie

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Passays, Johan. "Nouveaux ligands mixtes de type phosphore / carbène N-hétérocyclique : synthèse et applications en catalyse asymétrique." Thesis, Rouen, INSA, 2011. http://www.theses.fr/2011ISAM0008.

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Une méthode simple et efficace a été développée pour la préparation de ligands bifonctionnels associant les motifs phosphine ou phosphite d'une part, et carbène Nhétérocyclique(NHC) ou imidazolium d'autre part. Dans un premier temps, une série de ligands diphénylphosphine-carbène chiraux portant un centre stéréogène en a de la phosphinea été développée à partir b-hydroxyesters. Une famille de ligands a ainsi été développée afin d'évaluer l'influence de l'encombrement stérique de différents groupements alkyles en a de la phosphine et de la nature des groupements aromatiques portés sur l'imidazo

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Tang, Shun. "Cycloisomérisations catalysées par les sels du gallium et les complexes NHC-Gallium(III)." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112271.

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Afin de développer des méthodes alternatives à l'activation de systèmes Pi en catalyse homogène par des métaux nobles coûteux et toxiques, nous nous sommes focalisés sur des complexes métalliques et plus particulièrement ceux de la colonne du group XIII. Cette thèse approche une contribution à ce champ d'études, et nous nous sommes particulièrement concentrés sur la chimie de gallium.Trois principaux aspects ont été étudiés dans ce manuscrit: la réactivité des halogénures de gallium(III), des complexes bien définis de gallium (III) portant carbènes N- hétérocycliques (NHCs), et leur activation

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Gojon, Sophie. "Carbènes N-hétérocycliques : nouvelle méthode de synthèse et activité catalytique pour la réticulation de silicone." Toulouse 3, 2011. http://www.theses.fr/2011TOU30321.

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Ce travail concerne l'étude de carbènes de type N-hétérocyclique (NHCs) sous deux aspects : synthèse et réactivité The main objective of this thesis is to study the synthesis of N-heterocyclic (NHCs) and their catalytic activity toward silicone elastomer formation

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Darari, Mohamed. "Synthèse et caractérisation de nouveaux complexes Fe-NHC applicables en cellule solaire DSSC." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0318.

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Ces travaux de thèse se situent dans un domaine au cœur des préoccupations actuelles qui est le développement de nouveaux complexes photoactifs utilisant des métaux abondants pour remplacer les métaux nobles dans les dispositifs à énergie renouvelable. De nouvelles familles de complexes précurseurs ou sensibilisateurs potentiels pour les cellules DSSC (Dye-sensitized solar cells) à base de fer et de ligands tridentates pyridyl-carbènes (FeNHC) ont été préparées et caractérisées. L’objectif, à côté de l’aspect applicatif pour l’énergie, est d’accroître les connaissances dans l’étude des relatio

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Savchuk, Mariia. "Complexes atropisomériques d'or-NHC : design, synthèse et applications dans des réactions de cycloisomérisation asymétriques." Electronic Thesis or Diss., Aix-Marseille, 2022. http://www.theses.fr/2022AIXM0571.

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Le premier chapitre de ce manuscrit est consacré à l’étude des différents designs de NHCs chiraux décrits dans la littérature et leurs applications en tant que ligand dans les transformations énantiosélectives catalysées par l’or. Un nouveau concept de complexes atroipsomériques métal de transition-NHC a été conçu et développé dans notre groupe. Son application pour préparer des complexes de métaux de transition chiraux portant un ligand NHC de symétrie C1 contenant un NHC saturé a été étudiée au cours de mes travaux de doctorat et sera présentée dans le deuxième chapitre. Divers complexes chi

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Hussein, Hiba. "Synthèses de nouveaux ligands carbènes à structures N-hétérocycliques et macro-N-Bis-hétérocycliques symétriques et dissymétriques. Études de leurs propriétés photophysiques, biologiques et de coordination." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0014.

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L'objectif de ce travail de thèse consiste à préparer de nouvelles molécules photosensibles de type carbènes N-hétérocycliques, ligands ou complexes, dessinées pour répondre aux critères des photosensibilisateurs (PS) (molécules pures, hydrosolubles, biocompatibles, non toxiques, d'efficacité d'absorbance maximale, possédant de bonnes propriétés photophysiques) applicables dans le domaine des matériaux ou/et dans le domaine biomédical tel qu'en photothérapie. L'ambition étant d'optimiser les propriétés spectroscopiques des photosensibilisateurs et d'obtenir une bonne photoactivité. Ce travail

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Schnee, Gilles. "Synthèse et réactivité de nouveaux complexes des métaux du groupe 13 portés par des ligands carbènes N-hétérocycliques." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAF053/document.

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Au début de ces travaux, peu d’études avaient été faites sur la complexation des carbènes N-hétérocycliques avec des métaux oxophiles, électropositifs et à hauts degrés d’oxydation tel que les métaux du groupe 13. L’optimisation de voies de synthèse a permis d’étendre le nombre de complexes de types NHC-MIII (M = aluminium, gallium et indium), ainsi qu’à des complexes cationiques. L’association de ces précurseurs avec des NHCs plus encombrés a permis l’observation de réactivités sans précédent (complexes anormaux, paires de Lewis frustrées, dicarbènes N-hétérocycliques). Dans un second temps,

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Mais fontes

Livros sobre o assunto "Carbène NHC"

Estates, NHS, ed. Carbon/energy management in healthcare: Best practice advice for the NHS in England on meeting the mandatory carbon/energy targets, March 2000-March 2010. Stationery Office, 2004.

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United States. National Aeronautics and Space Administration., ed. Analysis of minerals containing dissolved taraces of the fluid phase components "water" and "carbon dioxide": Final report submitted to the NASA Ames Research Center for NASA cooperative agreement NCC 2-446. SETI Institute, 1991.

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Mozambique - Strengthening NDC Ambitions through Blue Carbon Frontiers. Washington, DC: World Bank, 2024. http://dx.doi.org/10.1596/42281.

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Jaramillo, Marcela, and Valentina Saavedra. NDC Invest: Supporting Transformational Climate Policy and Finance. Inter-American Development Bank, 2021. http://dx.doi.org/10.18235/0003340.

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The Inter-governmental Panel on Climate Change (IPCC) indicates that meeting the Paris Agreement's goal of limiting the global temperature rise from pre-industrial levels to between 1.5 and 2 degrees Celsius requires reaching net-zero emissions of carbon dioxide (CO2) between 2050 and 2070, as well as deep reductions in the emissions of other greenhouse gases by around mid-century (GHGs) (IPCC, 2018). At the same time countries need to build resilience to face the changes that cannot be avoided. NDC Invest was created as the one-stop-shop of the IDB Group providing technical and financial supp

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Great Britain: Department of Health: Estates and Facilities Division. Statistics on energy performance and carbon and CO2 Emissions: NHS England, 1999/00 to 2004/05. Stationery Office, The, 2006.

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Strand, Jon. Climate Finance, Carbon Market Mechanisms and Finance “Blending” as Instruments to Support NDC Achievement under the Paris Agreement. World Bank, Washington, DC, 2019. http://dx.doi.org/10.1596/1813-9450-8914.

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Eland, John H. D., and Raimund Feifel. Molecules with four, five or seven atoms. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198788980.003.0005.

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Double photoionisation spectra of NH3, C2H2, HCHO, C2N2, PCl3, CH4, the methyl halides CH3F, CH3Cl, CH3I, the methylene halides CH2Cl2, CH2Br2, CH2I2, the carbon tetrahalides CF4, CCl4, CBr4, germanium tetrahalides GeCl4, GeBr4, and SF6 are presented with analysis to identify the electronic states of the doubly charged ions. The effects of indirect double ionisation pathways are discussed. There are relatively few important molecules with just four atoms, but most of the ones included here are present and sometimes abundant in planetary and astrophysical environments. The range of five-atom mo

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Marques, Marcia, ed. Estudos Avançados em Engenharia Civil. Bookerfield Editora, 2022. http://dx.doi.org/10.53268/bkf21111100.

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No Brasil a Engenharia Civil se utiliza de ciência aplicada na execução de ações indispensáveis prestadas à sociedade. Além da grande área das Engenharias, sua abrangência multidisciplinar frequentemente colabora com as demais áreas do conhecimento com soluções em benefício da sociedade. Este livro reúne capítulos que trazem importantes avanços relacionados a estruturas, construção civil, eletrotécnica, hidráulica ambiental e geotecnia. Visando uma melhor organização, os capítulos estão agrupados nas seções: Ciência Onshore e Ciência Offshore. A seção de Ciência Onshore é composta por cinco ca

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Capítulos de livros sobre o assunto "Carbène NHC"

Louie, Janis. "Ni-NHC Mediated Catalysis." In N-Heterocyclic Carbenes in Synthesis. Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/9783527609451.ch7.

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Lazreg, Faïma, and Catherine S. J. Cazin. "NHC-Copper Complexes and their Applications." In N-Heterocyclic Carbenes. Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527671229.ch08.

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Chauhan, Pankaj, Suruchi Mahajan, Xiang-Yu Chen, and Dieter Enders. "Domino Processes in NHC Catalysis." In N-Heterocyclic Carbenes in Organocatalysis. Wiley-VCH Verlag GmbH & Co. KGaA, 2019. http://dx.doi.org/10.1002/9783527809042.ch5.

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Jin, Zhichao, Xingkuan Chen, and Yonggui R. Chi. "Recent Activation Modes in NHC Organocatalysis." In N-Heterocyclic Carbenes in Organocatalysis. Wiley-VCH Verlag GmbH & Co. KGaA, 2019. http://dx.doi.org/10.1002/9783527809042.ch7.

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Nagao, Kazunori, and Hirohisa Ohmiya. "N‑Heterocyclic Carbene (NHC)/Metal Cooperative Catalysis." In Asymmetric Organocatalysis Combined with Metal Catalysis. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43851-7_4.

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Chen, Xiangyu. "NHC-Catalyzed Annulations of Nitroalkenes." In New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2899-1_2.

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Lazreg, Faïma, and Catherine S. J. Cazin. "Medical Applications of NHC-Gold and -Copper Complexes." In N-Heterocyclic Carbenes. Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527671229.ch07.

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Wurm, Thomas, Abdullah Mohamed Asiri, and A. Stephen K. Hashmi. "NHC-Au(I) Complexes: Synthesis, Activation, and Application." In N-Heterocyclic Carbenes. Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527671229.ch09.

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Díez-González, Silvia, and Steven P. Nolan. "Palladium-catalyzed Reactions Using NHC Ligands." In N-Heterocyclic Carbenes in Transition Metal Catalysis. Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-36930-1_3.

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Chen, Xiangyu. "NHC-Catalyzed Enantioselective Annulations of Enals." In New Strategies for N-Heterocyclic Carbenes Catalyzed Annulations. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2899-1_3.

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Trabalhos de conferências sobre o assunto "Carbène NHC"

Kmetz, J. H., and D. J. Truax. "Carbonate Stress Corrosion Cracking of Carbon Steel in Refinery FCC Main Fractionator Overhead Systems." In CORROSION 1990. NACE International, 1990. https://doi.org/10.5006/c1990-90206.

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Abstract Intergranular cracking and failure of carbon steel piping and vessels of FCC Main Fractionator overhead systems in NH3-H2S-CO2-containing environments is attributed to carbonate stress corrosion cracking. From a plant water sampling program, cracking is correlated with water chemistry, open circuit potential, and pH.

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Opeka, Mark, and Ben Kowalski. "ZrC-NbC-TaC Solid Solutions for Carbon-Carbon Heat Exchange Tubes for Nuclear Thermal Propulsion Fuel Elements." In Nuclear and Emerging Technologies for Space (NETS 2025). American Nuclear Society, 2025. https://doi.org/10.13182/xyz-47529.

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Fortunato, Jo�o, Pedro M. Castro, Diogo A. C. Narciso, and Henrique A. Matos. "Towards the Decarbonization of a Conventional Ammonia Plant by the Gradual Incorporation of Green Hydrogen." In The 35th European Symposium on Computer Aided Process Engineering. PSE Press, 2025. https://doi.org/10.69997/sct.104649.

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As initiatives to decarbonize societies increase, industry is also being considered for policies to encourage its sustainability. Ammonia (NH3) industry relies entirely on Haber-Bosch (HB) process, consuming fossil fuels for hydrogen production and energy purposes, accounting for more than 1 % of anthropogenic carbon dioxide (CO2) emissions. Emerging technologies such as the electrochemical synthesis of NH3 promise sustainable production from water, air, and renewable energies, but low TRLs are still reported. The electrification of the HB process opens a more viable path for sustainable NH3 p

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Ng, Hon C., Victor Gutiérrez, Diogmary Arreaza, Fernando De Abreu, and Erick Hernández. "Naphthenic Acid Corrosion on a Extra-Heavy Crude Oil Upgrader Medium Vacuum Gasoil Side Cut Piping." In CORROSION 2013. NACE International, 2013. https://doi.org/10.5006/c2013-02185.

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Abstract After 5 years of operation, at an average temperature, sulfur content and neutralization number of 200°C (392°F), 3.3%wt and 4.3 mg KOH/gram, respectively; clean, streamlined through-wall pits, grooves and rivulets have caused leaks in the lower portion of horizontal and inclined pipes of the side cut carbon steel piping that draws medium vacuum gasoil (MVGO) from the vacuum distillation tower (VDT). The average corrosion rate estimated from through-wall pits is 4.7 mm/year (187 mils per year). Comparable corrosion morphologies were observed in carbon steel pump cases and VDT shell. T

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Kessing, Jonas, Alexander Nadermann, Brandon Shaver, Justin Milner, and Steven Zinkle. "Grain Growth and Hardness of ZrC, NbC, and TaC Tri-Carbide Surrogate Fuels for Nuclear Thermal Propulsion." In Nuclear and Emerging Technologies for Space (NETS 2024). American Nuclear Society, 2024. http://dx.doi.org/10.13182/nets24-43787.

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Srinivasan, Sridhar, Kwei Meng Yap, Richard J. Horvath, and Russell D. Kane. "Prediction and Assessment of Ammonium Bisulfide Corrosion under Refinery Sour Water Service Conditions – Part 3." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-08929.

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Abstract This paper summarizes results from Phase III of the joint industry program (JIP) on refinery alkaline sour water (ammonium bisulfide) corrosion. Phase III included a comprehensive engineering analysis of data from all three phases of the Sour Water JIP and the development of “H2S tie-in plots” based on a single parameter (H2S partial pressure), replacing the isocorrosion diagrams based on NH3 partial pressure developed in Phase II, and linking with the H2S isocorrosion diagrams based on H2S partial pressure developed in Phase I. These H2S tie-in plots enabled corrosion rate data for c

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Almarzooq, Yousef M., Matthew Hay, Olivier Mathieu, Waruna D. Kulatilaka, and Eric L. Petersen. "The Effect of Mixture Variation and Initial Temperature on the NH2* Thickness of Spherically Propagating Laminar Ammonia Flames." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-129437.

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Abstract Interest in ammonia (NH3) in combustion has increased in recent years as a carbon-free fuel alternative. Therefore, understanding its combustion characteristics is crucial. One way to increase the knowledge of ammonia combustion is by investigating the flame zone of a laminar flame. Using a high-spatial-resolution flame zone measurement technique developed by the current research group, the flame zone of different NH3-containing mixtures was measured experimentally. Those measurements were achieved by investigating spherically propagating flames using a chemiluminescence imaging diagn

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Ou, Juan, Ruomiao Yang, Yuchao Yan, Zhentao Liu, and Jinlong Liu. "Investigation of the Effect of Ammonia Addition on the Two-Stage Ignition Process of Dimethyl Ether Based on Chemical Kinetic Analysis." In ASME 2023 ICE Forward Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/icef2023-110108.

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Abstract Ammonia (NH3) has garnered considerable attention in recent years as a promising carbon-free hydrogen carrier fuel for internal combustion engines. However, directly using pure ammonia in compression-ignition engines poses challenges. To facilitate NH3 ignition, high-activity fuels are often employed to ignite the premixed NH3/air mixture and initiate combustion. This study specifically focuses on the ignition process of binary mixtures of NH3 and dimethyl ether (DME), considering that DME is a carbon-neutral high-activity fuel. By conducting zero-dimensional reaction kinetics analysi

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Su, Tong, Boyan Xu, Rob Bastiaans, and Nicholas A. Worth. "Lean Blow-Off Behaviour of Premixed Bluff-Body Stabilized Hydrocarbon-Air Flames and Ammonia/Hydrogen/Nitrogen-Air Flames." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-124613.

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Abstract Ammonia blends have great potential to be utilized in gas turbine combustors as carbon-free fuels. This paper investigates and compares the lean blow-off behavior of premixed bluff-body stabilized hydrocarbon flames and ammonia/hydrogen/nitrogen flames both experimentally and numerically. Simultaneous high-speed PIV and OH-PLIF are employed to resolve temporal flame and flow field information, allowing the curvature and hydrodynamic strain rates along the flame surfaces to be calculated. OH* and NH2*, chemiluminescence images are also used to examine flame structures at the same bulk

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Pugh, D., A. Valera-Medina, P. Bowen, et al. "Emissions Performance of Staged Premixed and Diffusion Combustor Concepts for an NH3/Air Flame With and Without Reactant Humidification." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-14953.

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Abstract Renewably generated ammonia offers a form of carbon-free chemical energy storage to meet the differences between uncertain renewable supply and fluctuating demand, and has the potential to support future energy requirements as a power-to-X concept. The storage and transportation characteristics of NH3 are favorable compared with H2, however there are significant combustion research challenges to enhance fuel reactivity whilst reducing harmful emissions production. The purpose of the presented work was to evaluate different fuel delivery concepts for a representative GT combustor. An e

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Relatórios de organizações sobre o assunto "Carbène NHC"

Fazekas, Andreas, and Scarleth Nuñez Castillo. NDC Invest Annual Overview 2020. Inter-American Development Bank, 2021. http://dx.doi.org/10.18235/0003430.

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NDC INVEST is an IDB Group platform offering financial solutions and technical support to help build national goals and transform them into attainable plans that generate prosperous, resilient, and carbon neutral economies. Throughout the years closely supporting LAC countries, NDC INVEST has gained valuable experience and knowledge in designing and implementing concrete actions that lead to long-term climate resilience and net-zero emissions by 2050. In 2020, NDC INVEST confirmed its key role in successfully translating national climate commitments into physical and beneficial economic plans

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Bruce, Fraser. Green Ward Toolkit Project. University of Dundee, 2024. https://doi.org/10.20933/100001403.

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The climate emergency is a health emergency. The British Medical Journal (2021) indicated that “if healthcare was a single country, it would be the world’s fifth largest emitter, accounting for 4.6% of greenhouse gas emissions”. This is resonant in the UK, where the National Health Service (NHS) is a cornerstone of society, deeply connected to the lives and wellbeing of its people. Design HOPES (Healthy Organisations in Place-based Eco-systems Scotland) is a two-year transdisciplinary research project that exploits the potential of design-led thinking to innovate and tackle multifaceted health

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Chepeliev, Maksym. Development of the Air Pollution Database for the GTAP 10A Data Base. GTAP Research Memoranda, 2020. http://dx.doi.org/10.21642/gtap.rm33.

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The purpose of this note is to document data sources and steps used to develop the air pollution database for the GTAP Data Base Version 10A. Emissions for nine substances are reported in the database: black carbon (BC), carbon monoxide (CO), ammonia (NH3), non-methane volatile organic compounds (NMVOC), nitrogen oxides (NOx), organic carbon (OC), particulate matter 10 (PM10), particulate matter 2.5 (PM2.5) and sulfur dioxide (SO2). The dataset covers four reference years – 2004, 2007, 2011 and 2014. EDGAR Version 5.0 database is used as the main data source. To assist with emissions redistrib

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Schur, Michael, and Aisha Reynolds. National Climate Finance Vehicles: Best Practice Insights from International Case Studies. Asian Development Bank, 2024. http://dx.doi.org/10.22617/wps240495-2.

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This working paper—developed under ADB’s NDC Advance technical assistance platform—sets out the important role that national climate finance vehicles can play in stimulating investment in low-carbon and climate-resilient development. It presents a model design framework and readiness criteria for clarifying the key factors supporting effective operation and achieving prioritized climate outcomes and sustainable development. The paper presents three case studies of national financing vehicles from Australia, Indonesia, and Thailand, identifying success factors and lessons learned. The paper con

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Gasim, Anwar, Lester C. Hunt, and Jeyhun Mikayilov. Baseline Forecasts of Carbon Dioxide Emissions for Saudi Arabia Using the Structural Time Series Model and Autometrics. King Abdullah Petroleum Studies and Research Center, 2023. http://dx.doi.org/10.30573/ks--2022-dp19.

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To tackle the threat of climate change, countries worldwide have signed the Paris Agreement. This agreement aims to limit the global average temperature increase to below 2 degrees Celsius and potentially below 1.5 degrees Celsius above pre-industrial levels (UNFCCC 2015). Parties to the Paris Agreement are required to submit domestic climate plans detailing their mitigation measures, known as nationally determined contributions (NDCs). These plans detail countries’ ambitions and efforts to combat and respond to climate change. NDCs are communicated at five-year intervals, and each successive

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Chepeliev, Maksym, Israel Osorio Rodarte, and Dominique van der Mensbrugghe. Distributional Impacts of Carbon Pricing Policies under Paris Agreement: Inter and Intra-Regional Perspectives. GTAP Working Paper, 2021. http://dx.doi.org/10.21642/gtap.wp88.

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While bringing multiple benefits for the environment, achievement of the stringent global greenhouse gas emissions reduction target, like the one outlined in the Paris Climate Agreement, is associated with significant implementation costs and could impact different dimensions of human well-being, including welfare, poverty and distributional aspects. In this paper, we analyze the poverty and distributional impacts of different carbon pricing mechanisms consistent with reaching the Paris Agreement targets. We link a global recursive dynamic computable general equilibrium model ENVISAGE with the

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Blair, Neal. A benthic carbon budget for the Continental Slope off Cape Hatteras, NC. Office of Scientific and Technical Information (OSTI), 1999. http://dx.doi.org/10.2172/765626.

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Kalman, Joseph, and Maryam Haddad. Wastewater-derived Ammonia for a Green Transportation Fuel. Mineta Transportation Institute, 2022. http://dx.doi.org/10.31979/mti.2021.2041.

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The energy-water nexus (i.e., availability of potable water and clean energy) is among the most important problems currently facing society. Ammonia is a carbon-free fuel that has the potential to reduce the carbon footprint in combustion related vehicles. However, ammonia production processes typically have their own carbon footprint and do not necessarily come from sustainable sources. This research examines wastewater filtration processes to harvest ammonia for transportation processes. The research team studied mock wastewater solutions and was able to achieve ammonia concentrations above

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Kalman, Joseph, and Maryam Haddad. Wastewater-derived Ammonia for a Green Transportation Fuel. Mineta Transportation Institute, 2022. http://dx.doi.org/10.31979/mti.2022.2041.

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Luomi, Mari, and Hind Aldhuwaihi. Saudi Arabia and the Circular Carbon Economy: From Vision to Implementation. King Abdullah Petroleum Studies and Research Center, 2024. http://dx.doi.org/10.30573/ks--2024-dp36.

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This case study shows how the Circular Carbon Economy (CCE) Index can be used to analyze a country’s CCE performance and enablers in a holistic manner and in a comparative context, relative to other countries. Saudi Arabia is an extremely relevant country to examine in this context given the centrality of the CCE concept in its climate change and energy transition policy. The paper aims to do two things: first, it provides an analysis of Saudi Arabia’s current CCE performance and its enabling environments for the CCE transition, relative to other countries. Second, it places this in the contex

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