Academic literature on the topic 'Selective oligomerization'

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Journal articles on the topic "Selective oligomerization"

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Sydora, Orson L. "Selective Ethylene Oligomerization." Organometallics 38, no. 5 (February 18, 2019): 997–1010. http://dx.doi.org/10.1021/acs.organomet.8b00799.

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Schumacher, Christoph, Hubert Wang, Christian Honer, Wei Ding, James Koehn, Quentin Lawrence, Christopher M. Coulis, et al. "The SCAN Domain Mediates Selective Oligomerization." Journal of Biological Chemistry 275, no. 22 (March 21, 2000): 17173–79. http://dx.doi.org/10.1074/jbc.m000119200.

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Barrault, J., J. M. Clacens, and Y. Pouilloux. "Selective Oligomerization of Glycerol Over Mesoporous Catalysts." Topics in Catalysis 27, no. 1-4 (February 2004): 137–42. http://dx.doi.org/10.1023/b:toca.0000013548.16699.1c.

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Mukherjee, Soumen, Binita A. Patel, and Sumit Bhaduri. "Selective Ethylene Oligomerization with Nickel Oxime Complexes§." Organometallics 28, no. 10 (May 25, 2009): 3074–78. http://dx.doi.org/10.1021/om900080h.

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Thalody, Betty, and Gregory G. Warr. "The Selective Binding of Anions to Gemini and Trimeric Surfactants at Air/Solution Interfaces." Australian Journal of Chemistry 57, no. 3 (2004): 193. http://dx.doi.org/10.1071/ch03300.

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The selective binding of Br–, Cl–, I–, NO3–, and salicylate anions to quaternary ammonium gemini and trimer surfactant solution/air interfaces has been studied by ion flotation, examining the effect of the degree of oligomerization and polymethylene spacer length between the quaternary nitrogen atoms. The binding of the halides and nitrate showed no significant change with degree of oligomerization. However, salicylate showed a marked decrease in selective uptake with increasing degree of oligomerization, and increased with increasing spacer length.
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Yu, Lanlan, Wenbo Zhang, Wendi Luo, Robert L. Dupont, Yang Xu, Yibing Wang, Bin Tu, et al. "Molecular recognition of human islet amyloid polypeptide assembly by selective oligomerization of thioflavin T." Science Advances 6, no. 32 (August 2020): eabc1449. http://dx.doi.org/10.1126/sciadv.abc1449.

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Selective oligomerization is a common phenomenon existing widely in the formation of intricate biological structures in nature. The precise design of drug molecules with an oligomerization state that specifically recognizes its receptor, however, remains substantially challenging. Here, we used scanning tunneling microscopy (STM) to identify the oligomerization states of an amyloid probe thioflavin T (ThT) on hIAPP8–37 assembly to be exclusively even numbers. We demonstrate that both adhesive interactions between ThT and the protein substrate and cohesive interactions among ThT molecules govern the oligomerization state of the bounded ThT. Specifically, the work of the cohesive interaction between two head/tail ThTs is determined to be 6.4 kBT, around 50% larger than that of the cohesive interaction between two side-by-side ThTs (4.2 kBT). Overall, our STM imaging and theoretical understanding at the single-molecule level provide valuable insights into the design of drug compounds using the selective oligomerization of molecular probes to recognize protein self-assembly.
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PAIK, Seung R., Hyun-Ju SHIN, Ju-Hyun LEE, Chung-Soon CHANG, and Jongsun KIM. "Copper(II)-induced self-oligomerization of α-synuclein." Biochemical Journal 340, no. 3 (June 8, 1999): 821–28. http://dx.doi.org/10.1042/bj3400821.

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α-Synuclein is a component of the abnormal protein depositions in senile plaques and Lewy bodies of Alzheimer's disease (AD) and Parkinson's disease respectively. The protein was suggested to provide a possible nucleation centre for plaque formation in AD via selective interaction with amyloid β/A4 protein (Aβ). We have shown previously that α-synuclein has experienced self-oligomerization when Aβ25-35 was present in an orientation-specific manner in the sequence. Here we examine this biochemically specific self-oligomerization with the use of various metals. Strikingly, copper(II) was the most effective metal ion affecting α-synuclein to form self-oligomers in the presence of coupling reagents such as dicyclohexylcarbodi-imide or N-(ethoxycarbonyl)-2-ethoxy-1,2-dihydroquinoline. The size distribution of the oligomers indicated that monomeric α-synuclein was oligomerized sequentially. The copper-induced oligomerization was shown to be suppressed as the acidic C-terminus of α-synuclein was truncated by treatment with endoproteinase Asp-N. In contrast, the Aβ25-35-induced oligomerizations of the intact and truncated forms of α-synuclein were not affected. This clearly indicated that the copper-induced oligomerization was dependent on the acidic C-terminal region and that its underlying biochemical mechanism was distinct from that of the Aβ25-35-induced oligomerization. Although the physiological or pathological relevance of the oligomerization remains currently elusive, the common outcome of α-synuclein on treatment with copper or Aβ25-35 might be useful in understanding neurodegenerative disorders in molecular terms. In addition, abnormal copper homoeostasis could be considered as one of the risk factors for the development of disorders such as AD or Parkinson's disease.
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Bekmukhamedov, Giyjaz E., Aleksandr V. Sukhov, Aidar M. Kuchkaev, and Dmitry G. Yakhvarov. "Ni-Based Complexes in Selective Ethylene Oligomerization Processes." Catalysts 10, no. 5 (May 1, 2020): 498. http://dx.doi.org/10.3390/catal10050498.

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Linear alpha-olefins are widely used in the petrochemical industry and the world demand for these compounds increases annually. At present, the main method for producing linear alpha-olefins is the homogeneous catalytic ethylene oligomerization. This review presents modern nickel catalysts for this process, mainly systems for obtaining of one of the most demanded oligomer—1-butene—which is used for the production of linear low density polyethylene (LLDPE) and high density polyethylene (HDPE). The dependence of the catalytic performance on the composition and the structure of the used activated complexes, the electronic and coordination states of the nickel center was considered.
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Schroeder, F. C., S. R. Smedley, L. K. Gibbons, J. J. Farmer, A. B. Attygalle, T. Eisner, and J. Meinwald. "Polyazamacrolides from ladybird beetles: Ring-size selective oligomerization." Proceedings of the National Academy of Sciences 95, no. 23 (November 10, 1998): 13387–91. http://dx.doi.org/10.1073/pnas.95.23.13387.

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Park, Dong Ho, Seong-Su Kim, Thomas J. Pinnavaia, Francisco Tzompantzi, Julia Prince, and Jaime S. Valente. "Selective Isobutene Oligomerization by Mesoporous MSU-SBEA Catalysts." Journal of Physical Chemistry C 115, no. 13 (March 11, 2011): 5809–16. http://dx.doi.org/10.1021/jp111642b.

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Dissertations / Theses on the topic "Selective oligomerization"

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Metzger, Eric Daniel. "The selective oligomerization of ethylene with metal-organic frameworks." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118271.

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Thesis: Ph. D. in Inorganic Chemistry, Massachusetts Institute of Technology, Department of Chemistry, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 195-207).
The benefits of heterogeneous catalysis for industry and the society at large cannot be overstated, with approximately 90% of all industrial catalysis being performed with heterogeneous catalysts. Despite the undeniable operational advantages of heterogeneous catalysts, several large volume industrial processes involved in the production of commodity chemicals remain impenetrable to solid catalysts. Among them are the selective dimerization of ethylene and the selective trimerization of ethylene, which require fine steric and electronic tuning to optimize the production of the desired olefin. In this thesis, I describe the development of new heterogeneous catalysts to address the lack of activity and selectivity found among heterogeneous catalysts for selective ethylene oligomerizations, with an emphasis on developing new metal-organic framework (MOF) catalysts for the selective dimerization of ethylene to 1-butene. The ability to tune the catalytically active site of a solid at the molecular level places MOFs in prime position to answer challenges in heterogeneous catalysis that no other class of solids has been able to address. Chapter 2 of this thesis describes the development of Ni-MFU-4/, a nickel-substituted MOF with excellent activity and selectivity for the dimerization of ethylene to 1-butene. Although the active sites in the MOF are designed to mimic homogeneous Nitrispyrazolylborate dimerization catalysts, the selectivity observed for the solid catalyst is considerably higher than that of the homogeneous system, highlighting the importance of active site isolation in the porous solid. Chapter 3 details a combination of studies utilizing isotopic labeling and mechanistic probes to demonstrate that Ni-MFU-4/ dimerizes ethylene via the Cossee-Arlman mechanism. Chapter 4 reports the preparation of Ni-CFA-1, a related heterogeneous ethylene dimerization catalyst that is far more synthetically accessible than Ni- MFU-4/. Lastly, chapter 5 relays initial results towards the development of MOF-based ethylene trimerization catalysts.
by Eric Daniel Metzger.
Ph. D. in Inorganic Chemistry
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Shaikh, Yacoob. "Towards Selective Ethylene Tetramerization." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23161.

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There is an increasing trend towards advancing the understanding and development of ethylene oligomerization catalysts, both in academia and industry. The metal of choice in this chemistry is invariably chromium, which has shown great versatility in selective trimerization/tetramerization, non-selective oligomerization and polymerization of ethylene. While much success has been achieved in ethylene trimerization, the same con not be said about tetramerization catalysis. Aminophosphine based ligands have demonstrated their ability towards selective 1-octene production, however, the popular PNP catalyst is able to achieve only 70% selectivity. In order to explore the possibility of developing and enhancing the selectivity of chromium based ethylene tetramerization catalyst, this thesis work was undertaken. The ligand systems we chose for our work were bidentate aminophosphine based (PN(CH2)nNP), which has yielded interesting selective oligomerization. Subtle modifications were found to result in drastic changes in selectivity, from tetramerization (PN(CH2)3NP) to trimerization (PN(CH2)2NP). We managed to successfully develop the first truly selective (over 90%) 1-octene catalyst with polymer-free behavior. Further modifications on the ligand framework, where one atom of Si was used to link the two NP units, resulted in non-selective oligomerization, in which case we determined that the oxidation-state of chromium is a key player. We explored other modifications on our selective ligands in which one of the arms on the bidentate ligand was replaced with a base-donor amine, phosphine or pyridine, and resulted in interesting selectivity changes. The final modification that we tested was a novel N(CH2)2P ligand and found it to be a highly active, non-selective oligomerization catalyst.
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Palmer, Ryan D. (Ryan Dee). "Mass transport in metal-organic frameworks as a limiting step in size-selective oligomerization." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/103507.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Chemistry, 2016.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Metal organic frameworks (MOFs) are a relatively new class of crystalline, porous materials at the interface of organic and inorganic chemistry that have been applied in gas absorption and storage systems, thin-film devices, and heterogeneous catalysts. While numerous examples of size-exclusive catalysis have been reported, to our knowledge no reports of size-selective oligomerization catalysis have been reported to date. Herein, chemically stable Zr based MOFs, namely UiO-67 and PCN-777, are investigated as possible candidates to promote size-selective oligomerization catalysis. Using acylated propylene-glycol methyl ethers as model substrates, the mass transport properties of these materials was investigated. Unfortunately, slow mass transport of solvated substrates through pores assumed to be sufficiently large for facile diffusion may prevent MOFs from serving as suitable scaffolds. Indeed, pore apertures large enough for quick diffusion rates may require pore volumes too large to allow reasonable size-selectivity.
by Ryan D. Palmer.
S.M.
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Thapa, Indira. "The Challenge of Selectivity in Ethylene Oligomerization: Ligand Design and Metal Valence States." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23188.

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Catalytic ethylene oligomerization is a well understood industrially viable process. The large majority of scientific literature and patents concerning this process has been developed with the use of chromium catalysts. Commercial systems producing selective tri/tetramerization, non-selective oligomerization and polymerization are all based on this metal with the exception of a few systems based on other transition metals (Zr, Ti, Ni etc.). This versatility raises interesting questions about chromium’s unique behaviour. Essentially, selective or non-selective oligomerization and polymerization processes could be regarded as belonging to the same category of C-C bond forming reactions, though different mechanisms are involved. The first part of this thesis explores a variety of chromium complexes for ethylene oligomerization purposes. In order to gather further information about the unique behaviour of chromium, we have explored a variety of nitrogen and phosphorus containing ligands. We started with a simple bi-dentate anionic amidophosphine (NP) ligand and assessed the role of the ligand’s negative charge and number of donor atoms in determining the type of catalytic behaviour in relation to the metal oxidation state. This ligand proved capable of generating a series of chromium dimeric, tetrameric or polymeric and even heterobimetallic chromium-aluminate complexes in different valence states. This allowed us to isolate a “single component” self activating Cr(II) complex as well as a rare example of mixed valence Cr(I)/Cr(II) species. Additionally, each of these species acted as switchable catalyst depending on the type of co-catalyst
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Touma, Marwan. "Nouvelles reactions d'oligomerisation et de telomerisation selectives catalysees par des complexes cationiques du palladium." Toulouse 3, 1986. http://www.theses.fr/1986TOU30139.

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De, Souza Roberto Fernando. "Etude des reactions d'oligomerisation, isomerisation et polymerisation de substrats insatures catalysees par des complexes allyle cationiques du nickel." Toulouse 3, 1987. http://www.theses.fr/1987TOU30152.

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Oligomerisation de l'ethylene. Mecanisme de l'isomerisation des olefines superieures en presence des complexes du titre. Polymerisation catalytique d'autres substrats insatures : styrene, dienes, alcynes. . . La polymerisation du phenylacetylene a ete etudiee en detail car elle conduit a des materiaux semiconducteurs a l'etat non dope
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Cai, Feng Xian. "Influence du coordinat triéthylphosphine sur la réactivité des ions Ni+ supportés dans la réactivité d'oligomérisation de l'éthylène." Paris 6, 1986. http://www.theses.fr/1986PA066077.

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Les deux premiers chapitres sont consacrés à la préparation et à la caractérisation des catalyseurs aux différentes étapes de leur élaboration par l'utilisation conjointe des spectroscopies RPE, Uv-Vis et IR. Les deux derniers chapitres sont consacrés aux tests catalytiques et à l'étude du mécanisme réactionnel et de l'empoisonnement des sites actifs.
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Teixeira, Bruno Miguel Queirós Rola. "Modeling of oligomerization in C3-cut selective hydrogenation." Dissertação, 2018. https://repositorio-aberto.up.pt/handle/10216/116553.

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Rreza, Iva. "Development of Tantalum Phenoxy-Imine Compounds for Selective Ethylene Oligomerization." Thesis, 2014. https://thesis.library.caltech.edu/8486/1/Senior%20Thesis%20Final%20Report_Iva%20Rreza.pdf.

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The development of catalysts that selectively oligomerize light olefins for uses in polymers and fuels remains of interest to the petrochemical and materials industry. For this purpose, two tantalum compounds, (FI)TaMe2Cl2 and (FI)TaMe4, implementing a previously reported phenoxy-imine (FI) ligand framework, have been synthesized and characterized with NMR spectroscopy and X-ray crystallography. When tested for ethylene oligomerization catalysis, (FI)TaMe2Cl2 was found to dimerize ethylene when activated with Et2Zn or EtMgCl, and (FI)TaMe4 dimerized ethylene when activated with B(C6F5)3, both at room temperature.
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Elowe, Paul Richard. "The Selective Oligomerization of Ethylene Using Chromium Diphosphine Catalysts and the Synthesis and Reactivity of Group 7 Carbonyl Derivatives Relevant to Synthesis Gas Conversion." Thesis, 2009. https://thesis.library.caltech.edu/5240/1/1_Title.pdf.

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The work presented in this thesis explores two distinct fields of organometallic chemistry with a common goal of selectively transforming cheap and abundant feedstocks to value-added chemicals using homogeneous catalysts.

Chapter 1 presents the synthesis and characterization of a series of bis(diphenylphosphino)amine ligands and their corresponding chromium(III) trichloride complexes. The isolated chromium complexes are precursors to highly active catalysts for the selective oligomerization of ethylene to 1-hexene and 1-octene. The unique feature of the ligands presented herein is the presence of coordinating functionalities tethered to the nitrogen backbone. These act as hemilabile donors, which stabilize the active species and/or transition states during catalysis. This increased stability leads to more productive catalysts. Furthermore, important solvent and additive effects have been investigated. While reactions in non-polar solvents exhibit poor activity at lower ethylene pressures, those in more polar solvents are highly active and generate very little undesired polymer. Varying the solvent has a significant impact on 1-hexene/1-octene selectivity as well. Experiments with potentially coordinating additives result in a higher tendency for 1-octene formation. An investigation of catalyst decomposition is also discussed.

Chapter 2 presents synthetic, structural and reactivity studies on a series of Group 7 carbonyl derivatives relevant to synthesis gas conversion. Reduction of the carbonyl precursors with a hydride source generates the corresponding formyl species. This reaction is facilitated when more electrophilic carbonyl complexes are employed. Neutral and cationic Fischer carbene complexes were prepared by the reaction of the formyl species with boranes and alkyltriflates, respectively. Further reduction of Group 7 methoxycarbenes with a hydride leads to the formation of a reactive methoxymethyl species. Dimethyl ether release is obtained from treatment of a manganese methoxymethyl species with a hydride. Moreover, subjecting manganese methoxymethyl complexes to an atmosphere of CO generates acyl complexes via migratory insertion. Preliminary mechanistic details are presented.

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Book chapters on the topic "Selective oligomerization"

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"Polymerization and Selective Oligomerization of Alkenes." In Homogeneous Catalysis, 167–200. Hoboken, NJ: John Wiley & Sons, Inc, 2014. http://dx.doi.org/10.1002/9781118872369.ch6.

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Baronetti, G. T., E. J. Lazzari, A. A. Castro, and O. A. Scelza. "Behavior of Metallic Oxides Suported On Li/MgO In The Methane Oligomerization." In New Developments in Selective Oxidation, 373–80. Elsevier, 1990. http://dx.doi.org/10.1016/s0167-2991(08)60169-x.

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Inui, T., and J. B. Kim. "High quality gasoline synthesis by selective oligomerization of light olefins and successive hydrogenation." In catalysts in Petroleum Refining and Petrochemical Industries 1995, Proceedings of the 2nd International Conference on Catalysts in Petroleum refining and Petrochemical Industries, 489–98. Elsevier, 1996. http://dx.doi.org/10.1016/s0167-2991(96)80049-8.

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York, Andrew P. E., John B. Claridge, Malcolm L. H. Green, and Shik Chi Tsang. "A Study of the Catalytic Oxidative Oligomerization of Methane to Aromatics." In New Developments in Selective Oxidation II, Proceedings of the Second World Congress and Fourth European Workshop Meeting, 315–26. Elsevier, 1994. http://dx.doi.org/10.1016/s0167-2991(08)63423-0.

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Conference papers on the topic "Selective oligomerization"

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Len, Christophe, Remi Nguyen, and Nicolas Galy. "Microwave-Assisted Continuous Flow for the Selective Oligomerization of Glycerol." In 1st International Electronic Conference on Catalysis Sciences. Basel, Switzerland: MDPI, 2020. http://dx.doi.org/10.3390/eccs2020-07519.

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Bolotov, Vasiliy Alexandrovich, Serguei Fedorovich Tikhov, Konstantin Radikovich Valeev, Vladimir Timurovich Shamirzaev, and Valentin Nikolaevich Parmon. "SELECTIVE FORMATION OF LINEAR ALPHA-OLEFINS VIA MICROWAVE CATALYTIC CRACKING OF LIQUID STRAIGHT-CHAIN ALKANES." In Ampere 2019. Valencia: Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9894.

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Linear even-carbon-number alpha-olefins (LAO) with four or more carbon atoms are important compounds of high demand in chemical industry as precursors of a wide range of value-added chemicals [1]. LAO are used as co-monomers for polyethylene production, for the production of alcohols (mainly in detergents and plasticizers) and for synthesis of polyalphaolefins (used in synthetic lubricants). Alpha-olefins (C4, C6, C8 and C10) are mainly used to produce poly(vinyl chloride) plasticizers, high-density and linear low-density polyethylene to impart the stress-crack resistance. C10–C14 alpha-olefins can be used to synthesize linear alkylbenzene sulfonates (synthetic detergents). A conventional route to produce alpha-olefins is oligomerization of ethylene. The process provides production of high quality alpha-olefins but is very costly. If not oligomerization, LAO can be produced by thermal cracking of waxy paraffins but the product is not pure and contains numerous internal olefins, dienes and paraffin impurities. The process is conducted in the vapor phase at relatively low cracking temperatures and needs rapid quenching to prevent side reactions such as isomerization or cyclization. In our previous work [2], we showed that the selectivity to alpha-olefins can be increased considerably via catalytic cracking of n-alkanes under selective MW heating of catalysts. In the present work, the general regularities of MW cracking of n-alkanes are presented. Porous ceramic matrix Al2O3/Al composites (ceramometals) and various carbon materials (CM) having high dielectric losses were studied as supports of the catalysts. MW cracking was conducted with n-C16H34 and n-C28H58. The influence particle size and surface morphology of ceramometals and CM on the structural and group composition of the products was studied. It was established that LAO (C2-C23) and n-alkanes (C2-C26) were the main cracking products under selective MW heating of the used supports. The quantitative analysis of the products demonstrated that the liquid-phase process is more selective to alpha-olefins at the MW catalytic cracking than at the convectional thermal cracking. Silica modification of the surface of CM was shown to suppress spark discharge (usually observed at MW heating of CM); hence, the thermal cleavage of C-C bonds on the CM surface but not in the plasma discharge contributes the most to the formation of radicals. It was shown that the selectivity to liquid alpha-olefin could be more than 85 % under MW heating of cermets in region of the E - field node and decrease considerably in the region of H - field node.
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