Gotowe bibliografie tematyczne / Colloidal hydrogenation

Gotowa bibliografia na temat „Colloidal hydrogenation”

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Data publikacji: 25 maja 2024

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Artykuły w czasopismach na temat "Colloidal hydrogenation"

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Pietrowski, Mariusz, Michał Zieliński i Maria Wojciechowska. "Nanocolloidal Ru/MgF2 Catalyst for Hydrogenation of Chloronitrobenzene and Toluene". Polish Journal of Chemical Technology 16, nr 2 (26.06.2014): 63–68. http://dx.doi.org/10.2478/pjct-2014-0031.

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Abstract The use of magnesium fluoride support for ruthenium active phase allowed obtaining new catalysts of high activities in the hydrogenation of toluene and ortho-chloronitrobenzene. Ruthenium colloid catalysts (1 wt.% of Ru) were prepared by impregnation of the support with the earlier produced polyvinylpyrrolidone (PVP)-stabilized ruthenium colloids. The performances of the colloidal catalysts and those obtained by traditional impregnation were tested in the reactions of toluene hydrogenation to methylcyclohexane and selective hydrogenation of ortho-chloronitrobenzene (o-CNB) to ortho-chloroaniline (o-CAN). It was shown that the use of chemical reduction method allows obtaining highly monodisperse ruthenium nanoparticles of 1.6–2.6 nm in size. After reduction in hydrogen at 400oC, the colloidal ruthenium nanoparticles were found to strongly interact with MgF2 surface (SMSI), which decreased the catalyst ability to hydrogen chemisorption, but despite this, the colloid catalysts showed higher activity in o-CNB hydrogenation and higher selectivity to o-CAN than the traditional ones. It is supposed that their higher activity can be a result of high dispersion of Ru in colloid catalysts and the higher selectivity can be a consequence of the lower availability of hydrogen on the surface.
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Konuspayev, Sapar, Minavar Shaimardan, Nurlan Annas, T. S. Abildin i Y. Y. Suleimenov. "Hydrogenation of benzene and toluene over supported rhodium and rhodium-gold catalysts". MATEC Web of Conferences 340 (2021): 01026. http://dx.doi.org/10.1051/matecconf/202134001026.

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Rhodium and rhodium-gold catalysts supported on amorphous aluminosilicates (ASA), titanium dioxide (rutile, TiO2) was prepared in two different ways: absorption and colloidal method. The catalysts were characterized by an inductively coupled plasma optical emission spectrometer (ICP-OES), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The activity and selectivity of the prepared catalysts were tested by the hydrogenation of benzene and toluene. Hydrogenation was conducted at a pressure of 4 MPa and a temperature 80 °C. The bimetallic Rh-Au/ASA catalyst prepared by the absorption method showed higher activity and selectivity in benzene hydrogenation reaction, the same catalyst prepared by the colloidal method demonstrated lower selectivity.
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Chen, Ting-An, i Young-Seok Shon. "Alkanethiolate-Capped Palladium Nanoparticles for Regio- and Stereoselective Hydrogenation of Allenes". Catalysts 8, nr 10 (29.09.2018): 428. http://dx.doi.org/10.3390/catal8100428.

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Colloidal Pd nanoparticles capped with octanethiolate ligands have previously shown an excellent selectivity toward the mono-hydrogenation of both isolated and conjugated dienes to internal alkenes. This paper reports an efficient stereoselective mono-hydrogenation of cumulated dienes (allenes) to either Z or E olefinic isomers, depending on the substitution pattern around C=C bonds. Kinetic studies indicate that the reaction progresses through the hydrogenation of less hindered C=C bonds to produce internal Z olefinic isomers. In the cases of di-substitued olefinic products, this initial hydrogenation step is followed by the subsequent isomerization of Z to E isomers. In contrast, the slow isomerization of Z to E isomers for tri-substituted olefinic products results in the preservation of Z stereochemistry. The high selectivity of Pd nanoparticles averting an additional hydrogenation is steered from the controlled electronic and geometric properties of the Pd surface, which are the result of thiolate-induced partial poisoning and surface crowding, respectively. The high activity of colloidal Pd nanoparticle catalysts allows the reactions to be completed at room temperature and atmospheric pressure.
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Bahruji, Hasliza, Mshaal Almalki i Norli Abdullah. "Highly Selective Au/ZnO via Colloidal Deposition for CO2 Hydrogenation to Methanol: Evidence of AuZn Role". Bulletin of Chemical Reaction Engineering & Catalysis 16, nr 1 (19.01.2021): 44–51. http://dx.doi.org/10.9767/bcrec.16.1.9375.44-51.

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Gold, Au nanoparticles were deposited on ZnO, Al2O3, and Ga2O3 via colloidal method in order to investigate the role of support for CO2 hydrogenation to methanol. Au/ZnO was also produced using impregnation method to investigate the effect of colloidal method to improve methanol selectivity. Au/ZnO produced via sol immobilization showed high selectivity towards methanol meanwhile impregnation method produced Au/ZnO catalyst with high selectivity towards CO. The CO2 conversion was also influenced by the amount of Au weight loading. Au nanoparticles with average diameter of 3.5 nm exhibited 4% of CO2 conversion with 72% of methanol selectivity at 250 °C and 20 bar. The formation of AuZn alloy was identified as active sites for selective CO2 hydrogenation to methanol. Segregation of Zn from ZnO to form AuZn alloy increased the number of surface oxygen vacancy for CO2 adsorption to form formate intermediates. The formate was stabilized on AuZn alloy for further hydrogenation to form methanol. The use of Al2O3 and Ga2O3 inhibited the formation of Au alloy, and therefore reduced methanol production. Au/Al2O3 showed 77% selectivity to methane, meanwhile Au/Ga2O3 produced 100% selectivity towards CO. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
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Vrijburg, Wilbert L., Jolanda W. A. van Helden, Arno J. F. van Hoof, Heiner Friedrich, Esther Groeneveld, Evgeny A. Pidko i Emiel J. M. Hensen. "Tunable colloidal Ni nanoparticles confined and redistributed in mesoporous silica for CO2 methanation". Catalysis Science & Technology 9, nr 10 (2019): 2578–91. http://dx.doi.org/10.1039/c9cy00532c.

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Delgado, Jorge A., Olivia Benkirane, Carmen Claver, Daniel Curulla-Ferré i Cyril Godard. "Advances in the preparation of highly selective nanocatalysts for the semi-hydrogenation of alkynes using colloidal approaches". Dalton Transactions 46, nr 37 (2017): 12381–403. http://dx.doi.org/10.1039/c7dt01607g.

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Wang, Xiaodong, Noémie Perret, Laurent Delannoy, Catherine Louis i Mark A. Keane. "Selective gas phase hydrogenation of nitroarenes over Mo2C-supported Au–Pd". Catalysis Science & Technology 6, nr 18 (2016): 6932–41. http://dx.doi.org/10.1039/c6cy00514d.

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Sun, Yifan, Albert J. Darling, Yawei Li, Kazunori Fujisawa, Cameron F. Holder, He Liu, Michael J. Janik, Mauricio Terrones i Raymond E. Schaak. "Defect-mediated selective hydrogenation of nitroarenes on nanostructured WS2". Chemical Science 10, nr 44 (2019): 10310–17. http://dx.doi.org/10.1039/c9sc03337h.

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Colloidal 2H-WS2 nanostructures catalyze selective hydrogenation of substituted nitroarenes to anilines with molecular hydrogen, where sulfur vacancies and tungsten-terminated edges play key roles in enabling functional group selectivity.
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Konuspayeva, Zere, Pavel Afanasiev, Thanh-Son Nguyen, Luca Di Felice, Franck Morfin, Nhat-Tai Nguyen, Jaysen Nelayah i in. "Au–Rh and Au–Pd nanocatalysts supported on rutile titania nanorods: structure and chemical stability". Physical Chemistry Chemical Physics 17, nr 42 (2015): 28112–20. http://dx.doi.org/10.1039/c5cp00249d.

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Au–Rh and Au–Pd nanoalloys synthesized by colloidal methods and immobilized on rutile titania nanorods are more stable than their monometallic counterparts for tetralin hydrogenation in the presence of sulfur.
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Pike, Sebastian D., Andrés García-Trenco, Edward R. White, Alice H. M. Leung, Jonathan Weiner, Milo S. P. Shaffer i Charlotte K. Williams. "Correction: Colloidal Cu/ZnO catalysts for the hydrogenation of carbon dioxide to methanol: investigating catalyst preparation and ligand effects". Catalysis Science & Technology 7, nr 18 (2017): 4233. http://dx.doi.org/10.1039/c7cy90083j.

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Correction for ‘Colloidal Cu/ZnO catalysts for the hydrogenation of carbon dioxide to methanol: investigating catalyst preparation and ligand effects’ by Sebastian D. Pike et al., Catal. Sci. Technol., 2017, DOI: 10.1039/c7cy01191a.
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Rozprawy doktorskie na temat "Colloidal hydrogenation"

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Weiner, Jonathan. "Colloidal Cu/ZnO nanocatalysts for CO2 hydrogenation to methanol". Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/57498.

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This thesis centres on the development of colloidal nanoparticles for the hydrogenation of carbon dioxide to methanol. Chapter two focusses on the synthesis of zinc oxide (ZnO) nanoparticles through the hydrolysis of diethylzinc in the presence of sub-stoichiometric quantities of organic ligands. Characterisation of the product, through a range of spectroscopic, diffraction and electron microscopy techniques, reveals small (3-4 nm), equiaxial, mono-disperse ZnO nanoparticles coordinated to alkyl-carboxylate, phosphinate and sulfinate ligands. Detailed investigation of the dioctyl-phosphinate capped-zinc oxide nanoparticles reveals that increasing the loading of ligand into the reaction (from 0.05-0.33 equivalents of ligand to zinc) does not affect the size or morphology of the nanoparticles, rather influencing the ligand density and coverage of the nanoparticle surface. In chapter three, these partially capped ZnO nanoparticles, mixed with copper nanoparticles, demonstrate catalytic activity for CO2 hydrogenation. Post-reaction analysis showed significant nanoparticle rearrangement, with an interface forming between the copper and the ZnO. In some cases, a self-assembled nanostructure is observed, consisting of a copper nanoparticle sandwiched between two pyramidal zinc oxide nanoparticles. The ligand has a significant effect on the activity of the catalyst; more reductively stable di-alkyl phosphinate ligands show superior activity to carboxylates. Decreasing the ligand loading on the zinc oxide nanoparticles, results in a higher peak activity due to the decreased ligand density exposing more of the catalyst surface, however the stability of the catalyst is also reduced. In chapter four, the interface between nanoparticles is targeted, with the goal of depositing copper onto the ZnO colloids through reduction and thermolysis reactions to form hybrid Cu/ZnO nanostructures. The most effective route entails the hydrogenolysis of mesitylcopper(I) on to the ZnO nanoparticles, the resulting nanocatalyst displays superior peak activity to both the mixed nanoparticle catalyst described above and a suspension of the commercial catalyst run under the same conditions.
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Wand, Patricia [Verfasser], Ulrich Kaspar [Akademischer Betreuer] [Gutachter] Heiz i Klaus [Gutachter] Köhler. "Synthesis, Characterization and Application of Platinum Nanoparticles in Colloidal Hydrogenation Reactions / Patricia Wand. Betreuer: Ulrich Kaspar Heiz. Gutachter: Ulrich Kaspar Heiz ; Klaus Köhler". München : Universitätsbibliothek der TU München, 2016. http://d-nb.info/1107543568/34.

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André, Rémi F. "Tailored routes to metal-containing nanoparticles for hydrogenation reactions in solution : surface design for H2 activation". Electronic Thesis or Diss., Sorbonne université, 2021. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2021SORUS190.pdf.

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Dans ces travaux de thèse, nous avons exploré différentes classes de nanoparticules métalliques telles que des carbures, des oxydes et des phosphures, pour des applications en catalyse colloïdale. Afin de construire un système catalytique de type « Paire de Lewis Frustrée », la synergie avec des bases de Lewis moléculaires a été étudiée. En introduction, les enjeux et les défis de l’activation de H2 en solvant sont présentés, avec un focus sur les catalyseurs non purement métalliques pour l’hydrogénation de composés modèles. Dans la première partie, des carbures et des hydrures de métaux de début de transition ont été synthétisés par métathèse solide-solide. Nous avons exploré l’influence de différents paramètres de procédé sur la spéciation de phase des produits. Les catalyseurs supportés les plus prometteurs, Mo2C/C et W2C/C, ont été étudiées pour l’hydrogénation d’oléfines en phase gaz et en solvant. Dans la deuxième partie, des oxydes de cerium et d’indium ont été produits par voie hydrothermale. L’importance de défauts d’oxygène dans CeO2-x pour l’activation de H2 en phase gaz et pour la semi-hydrogénation du phénylacétylène a été établie. La dernière partie est dédiée à la synthèse solvothermale d’oxydes de molybdène et de tungstène, ainsi qu’à celle de carbure et de phosphures de nickel. Les mécanismes de synthèse ont été étudiés par RMN pour la partie organique et par XAS et DRX pour la partie inorganique. L’activité catalytique des nanoparticules non supportées a finalement été évaluée pour l’hydrogénation du nitrobenzène et du phénylacétylène dans plusieurs solvants
In this thesis work, the use of metal-containing nanoparticles such as carbides, oxides and phosphides is explored for colloidal catalysis. In an attempt to build a Frustrated Lewis Pair (FLP)-like catalytic system for H2 activation, the synergy with a molecular Lewis base is assessed. In the bibliographic introduction, the stakes and the challenges of H2 activation in solvent are presented, with an emphasis on the use of non-purely metallic catalysts for the hydrogenation of model compounds. In the first part, early transition metal carbides and hydrides are synthesized via solid-state metathesis. The influence of process parameters is explored to tune the phase speciation in the products. The most promising carbon-supported catalysts, Mo2C/C and W2C/C, are studied for gas phase and liquid phase hydrogenations of olefins. In the second part, cerium and indium oxides are obtained via hydrothermal pathways. The relevance of oxygen defects in CeO2-x is established for H2 gas phase activation and semi-hydrogenation of phenylacetylene in solvent. The last part is dedicated to the non-aqueous syntheses of molybdenum and tungsten oxides, and nickel carbide and phosphides. The syntheses mechanisms are studied by means of NMR for the organic species and XAS and XRD for the nature of the inorganic species. The catalytic activity of the unsupported nanoparticles is finally evaluated for the hydrogenation of nitrobenzene and phenylacetylene in various solvents
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Baldyga, Lyndsey Michelle. "Effect of Platinum Particle Size on the Sulfur Deactivation of Hydrogenation". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/3966.

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A large concern of the fossil fuel and renewable energy industries is the sulfur poisoning of catalysts. In the case of noble metals, such as platinum, it is seen that there is a size trend associated with the level of activity in the presence of sulfur. Smaller nanoparticles could be more tolerant due to sulfur surface vacancies. On the other hand, larger particles could have less deactivation because the sulfur is more attracted to the smaller particles and the sulfur molecules bind stronger to these smaller particles. The size effect of sulfur deactivation was investigated by testing four sizes of nanoparticles, ranging from 2 - 7 nm with and without sulfur by running an ethylene hydrogenation reaction. The synthesized particles were characterized by mass spectrometry, X - ray diffraction, and transmission electron microscopy. The 7 nm catalyst resulted in being the most sulfur tolerant due to the sulfur particles binding strongly to the smaller particles.
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Chen, Liang-Fu, i 陳亮夫. "Effect of Additives on Ni-B Colloid Catalysts for the Hydrogenation of p-Chloronitrobenzene". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/67440363797111653070.

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碩士
國立中央大學
化學工程與材料工程研究所
94
Ni-B amorphous catalysts proved to be a better catalyst on both activity and selectivity for hydrogenation of p-chloronitrobenzene (p-CNB) from previous studies. However, the catalytic activity of Ni-B catalyst did not compete with that of noble metals viz., Pd and Pt. In order to enhance the catalytic activity of Ni-B for the hydrogenation, six additives were introduced into Ni-B amorphous catalyst, including metal salts of Cr, Ce, Th, W, Ru and Mo. A series of modified Ni-B amorphous nanocatalysts were prepared by chemical reduction of mixed salts of the metal additive and nickel acetate tetrahydrate with sodium borohydride in water/methanol solution. The characterization results revealed that at a specific weight ratio of metal dopants, some particles of modified Ni-B catalysts became smaller and have better thermal resistance, and protecting the special amorphous structure even at high temperature. During hydrogenation of p-CNB, some modified Ni-B catalysts have showed lower catalytic activity than unmodified one. However, the catalytic activity of these promoted catalysts are better than Raney nickel used in industries, with high selectivity to the main product of p-CAN (p-chloroaniline). Among these promoted catalysts, Mo-Ni-B showed the best activity and reached almost 100% conversions even at lower reaction temperature of 323K. According to kinetic studies and results of various characterization methods, such as powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and N2 sorption, the correlation of the catalytic performance to both the structural and the electronic characteristics have been arrived and discussed briefly.
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Części książek na temat "Colloidal hydrogenation"

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Ravet, I., A. Gourgue i J. B. Nagy. "Hydrogenation Activity of Colloidal Cobalt Boride Particles Synthesized in the CTAB-1-Hexanol-Water Reversed Micellar Systems". W Surfactants in Solution, 697–712. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-7981-6_12.

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Joó, F. "Alkanes by Hydrogenation of Alkenes with Polymer-Stabilized Colloidal Metal Catalysts". W Water in Organic Synthesis, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-206-00084.

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Maumela, Mulisa, i Ndzondelelo Bingwa. "Leveraging Dendrimer Macromolecules for the Encapsulation and Stabilisation of Nano-Sized Ruthenium Catalysts: Evaluation of Catalytic Reaction Kinetics in the Reduction of Pollutants Organic Dyes, Oxidation of Alcohols and Alkenes as Well as Hydrogenation Reactions". W Ruthenium - Materials Properties, Device Characterizations, and Advanced Applications. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.111453.

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Encapsulation of nano-sized metal catalysts within the dendrimers macromolecules’ frameworks has been well documented thus far. Dendrimers are described as symmetric, monodispersed macromolecules resembling a tree-like branched structure and have been utilised as both a template and stabilising agent for the fabrication of metal (noble and non-noble) nano-catalysts. For this purpose, different types of dendrimers can be employed. The use of dendrimers for metal catalysts stabilisation or encapsulation offers several advantages in catalysis. For example, the dendrimer template allows the synthesis of catalytically active monodispersed nanoparticles and the dendrimers template itself does not passivate the metal active atoms during the catalytic process. Additionally, dendrimers have the potential to act as a “vehicle” that can be leveraged for the fabrication of heterogeneous catalysts. For example, surface groups of the dendrimers can be functionalised to chemically link the dendrimer-encapsulated nanoparticles (DENs) with solid supports such as silica. A significant number of studies on the synthesis and catalytic evaluation of dendrimer-metal nanocomposite materials (e.g. Ruthenium-based) onvarious reactions can be found in the literature. This chapter, however, will particularly focus on the recent developments on the synthesis, characterisation and catalytic applications of dendrimer-derived (colloidal and supported) Ruthenium catalysts.
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Margitfalvi, J., I. Bertoti, L. Toth, L. Yakhyaeva, E. Talas i E. Tfirst. "Enantioselective Hydrogenation of Ethyl Pyruvate over Pt Colloids". W Catalysis of Organic Reactions. CRC Press, 2002. http://dx.doi.org/10.1201/9780203911013.ch29.

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"Enantioselective Hydrogenation of Ethyl Pyruvate over Pt Colloids". W Catalysis of Organic Reactions, 420–31. CRC Press, 2002. http://dx.doi.org/10.1201/9780203911013-32.

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Joó, F. "Hydrogenation of Pent-2-yne with Polymer-Stabilized Metal Colloids". W Water in Organic Synthesis, 1. Georg Thieme Verlag KG, 2012. http://dx.doi.org/10.1055/sos-sd-206-00100.

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Borsla, A., A. M. Wilhelm, J. P. Canselier i H. Delmas. "Hydrogenation of olefins in aqueous phase, catalyzed by ligand-protected and polymer-protected rhodium colloids". W Studies in Surface Science and Catalysis, 2093–98. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80777-6.

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