Thematische Bibliographien / Molybdenum compounds

Auswahl der wissenschaftlichen Literatur zum Thema „Molybdenum compounds“

Autor: Grafiati
Veröffentlicht am 4. Juni 2021
Zuletzt aktualisiert am 22. Juni 2024

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Inhaltsverzeichnis

  1. Zeitschriftenartikel
  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte
  6. Berichte der Organisationen

Zeitschriftenartikel zum Thema "Molybdenum compounds":

1

Osipov, P. A., R. A. Shayakhmetova und A. B. Sagyndykov. „Preparation, purification and dissolution of molybdenum oxychloride compounds in water“. Engineering Journal of Satbayev University 144, Nr. 6 (2022): 18–23. http://dx.doi.org/10.51301/ejsu.2022.i6.03.

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Expansion of the fields of application of molybdenum and its compounds of high purity requires the study of their various purification methods. The paper considers low-temperature chlorination of technical molybdenum dioxide, purification of the gas mixture from impurities in the filter system, condensation and dissolution of purified molybdenum oxychloride compounds in water. On filters made of tableted sodium chloride, gaseous molybdenum dioxide is purified from aluminum, iron, chromium and nickel with the formation of low-volatile compounds. The capture of silicon by this filter was not detected. Purification of tungsten on filters of granular molybdenum oxide practically does not occur. Purified molybdenum oxychloride compounds are desublimated in the form of compact and fluffy products with an underestimated chlorine content relative to the stoichiometric composition of molybdenum dioxide. Compact molybdenum oxychloride compounds dissolve in distilled water with little or no precipitation. When dissolving fluffy compounds of molybdenum, a tangible precipitate is formed, into which a significant part of the impurities passes.
2

Roggan, Stefan, und Christian Limberg. „Molecular molybdenum/bismuth compounds“. Inorganica Chimica Acta 359, Nr. 15 (Dezember 2006): 4698–722. http://dx.doi.org/10.1016/j.ica.2006.04.030.

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3

Osipov, P. A., R. A. Shayakhmetova, A. B. Sagyndykov, G. K. Maldybaev und Zh А. Alybaev. „PREPARATION, PURIFICATION AND DISSOLUTION OF MOLYBDENUM OXYCHLORIDE COMPOUNDS IN WATER“. Vestnik of the Kyrgyz-Russian Slavic University 22, Nr. 12 (2022): 72–79. http://dx.doi.org/10.36979/1694-500x-2022-22-12-72-79.

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4

Borukaev, Timur A., A. Kh Shaov, I. A. Shogenova, M. A. Pshitsukova und M. S. Pshikhacheva. „Thermostability and Mechanical Properties of PVC-Plastic/Molybdenum Compounds“. Materials Science Forum 935 (Oktober 2018): 140–43. http://dx.doi.org/10.4028/www.scientific.net/msf.935.140.

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Composites based on PVC-plastic and molybdenum compounds were obtained. Thermostability and mechanical properties of the obtained compounds were studied. High thermal stability of the obtained PVC compounds was found. It is shown that molybdenum compounds effectively bind hydrogen chloride and catalyze structural changes in macromolecules. At the same time, the introduction of molybdenum compounds in PVC-plastic does not lead to deterioration in the mechanical properties of the material.
5

Klienkov, Alexey V., Lyubov A. Petukhova und Alexander A. Petukhov. „The study of molybdenum-containing solutions by IR spectroscopy“. Butlerov Communications 61, Nr. 2 (29.02.2020): 103–7. http://dx.doi.org/10.37952/roi-jbc-01/20-61-2-103.

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Molybdenum compounds are widely used as catalysts for various chemical reactions, such as: oxidation, epoxidation, hydrogenation, reduction, etc. In particular, molybdenum compounds are used as a catalyst in the epoxidation of propylene with ethylbenzene hydroperoxide during the joint production of styrene and propylene oxide introduced into the industry as part of PJSC "Nizhnekamskneftekhim". We are working to verify the possibility of using glycol solutions, oxygen-containing inorganic compounds of molybdenum, such as molybdenum acid (MK), molybdenum anhydride (MA) and ammonium paramolybdate (PMA) as an epoxidation reaction catalyst. In the initial molybdenum compounds used to prepare the catalyst solutions, molybdenum is in the hexavalent state. The temperature treatment of these compounds in coordinating solvents, glycols, leads to their partial depolymerization and reduction to Mo(VI). Moreover, the more coordinating the solvent, the deeper these processes are flowed. There are reports in the literature on the study of various molybdenum compounds in aqueous media and crystalline state by IR spectroscopy and Raman scattering. It was found that the dissolution of MA, MK, and PMA in monoethylene glycol (MEG) is associated with the formation in the solution of compounds Mo(V), Mo(VI) of various molecular composition in the form of monomers, dimers, tetramers, and also in the form of the main components of hept- and octamers and higher molecular weight compounds. As the temperature rises, initially larger monomers of the octa- and hepta-form type transform into monomers of lower aggregation. All established patterns are analyzed by the example of PMA solutions in MEG.
6

Jurowska, Anna, Kamil Jurowski, Janusz Szklarzewicz, Boguslaw Buszewski, Tatiana Kalenik und Wojciech Piekoszewski. „Molybdenum Metallopharmaceuticals Candidate Compounds - The “Renaissance” of Molybdenum Metallodrugs?“ Current Medicinal Chemistry 23, Nr. 29 (17.10.2016): 3322–42. http://dx.doi.org/10.2174/0929867323666160504103743.

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Khusnutdinov, R. I., T. M. Oshnyakova und U. M. Dzhemilev. „Molybdenum compounds in organic synthesis“. Russian Chemical Reviews 86, Nr. 2 (28.02.2017): 128–63. http://dx.doi.org/10.1070/rcr4617.

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8

Odularu, Ayodele T., Peter A. Ajibade und Johannes Z. Mbese. „Impact of Molybdenum Compounds as Anticancer Agents“. Bioinorganic Chemistry and Applications 2019 (10.09.2019): 1–9. http://dx.doi.org/10.1155/2019/6416198.

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The aim of this mini review was to report the molybdenum compound intervention to control cancer disease. The intervention explains its roles and progress from inorganic molybdenum compounds via organomolybdenum complexes to its nanoparticles to control oesophageal cancer and breast cancer as case studies. Main contributions of molybdenum compounds as anticancer agents could be observed in their nanofibrous support with suitable physicochemical properties, combination therapy, and biosensors (biomarkers). Recent areas in anticancer drug design, which entail the uses of selected targets, were also surveyed and proposed.
9

Liu, Shuxia, Yanyong Liu, Jie Liu, Baitao Li und Enbo Wang. „Antitumor Activity of Molybdenum Heteropoly Compounds“. Chinese Journal of Applied Chemistry 13, Nr. 2 (01.04.1996): 104–6. http://dx.doi.org/10.3724/j.issn.1000-0518.1996.2.104106.

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Klienkov, Alexey V., und Alexander A. Petukhov. „Obtaining molybdenyl glycolate using ethanol as a salting out solvent“. Butlerov Communications 59, Nr. 9 (30.09.2019): 66–70. http://dx.doi.org/10.37952/roi-jbc-01/19-59-9-66.

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The global production of propylene oxide is more than 8 million tons/year and is increasing by more than 5% annually. Almost all domestic propylene oxide (72 thousand tons/year) is produced at PJSC Nizhnekamskneftekhim (Russia) according to one of the variants of the Halcon process – epoxidation of propylene with ethylbenzene hydroperoxide (HPEB) in the presence of a molybdenum catalyst. One of the most important tasks arising in improving the process for the joint production of styrene and propylene oxide at PJSC Nizhnekamskneftekhim (Russia) is the search and development of new catalysts and catalytic systems, one of the stages of this process – the epoxidation of propylene with HPEB. The complex molybdenum catalyst used in the production of propylene oxide, having high activity and selectivity, has several disadvantages, namely: low dissolved molybdenum content, high consumption of ethylbenzene hydroperoxide for its production, and instability during storage. Thus, the problem of obtaining a catalyst with a higher content of dissolved molybdenum and increasing the stability of the catalytic complex, i.e. development of new catalytic systems with the best technological and technical and economic indicators. An analysis of the scientific and technical literature and patent publications showed that in the synthesis of a complex molybdenum catalyst, various molybdenum compounds of both organic and inorganic nature can be used. During the study, molybdenum-containing solutions based on ammonium paramolybdate and monoethylene glycol were tested, distillation distillation products prepared by distilling off excess monoethylene glycol by strengthening under vacuum. Molybdenyl glycolate was isolated by salting out with ethanol from a distillation bottoms product.
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Zeitschriftenartikel Dissertationen Bücher

Dissertationen zum Thema "Molybdenum compounds":

1

Ellis, S. R. „Characterisation of molybdenum compounds relevant to the molybdenum cofactor of the oxo-molybdenum enzymes“. Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376593.

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Rickman, Sarah. „Growth and characterization of molybdenum disulfide, molybdenum diselenide, and molybdenum(sulfide, selenide) formed between molybdenum and copper indium(sulfide, selenide) during growth“. Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.94 Mb., 85 p, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:1435848.

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Şahin, Engin Sözüer Topaloğlu Işıl. „Synthesis And Characterization Oxo-İmido [Tris (3,5-Dimethyl-Pyrazol) Borate] Molybdenum Complexes/“. [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimya/T000444.rar.

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Zhang, Liping. „Hydrodenitrogenation of organonitrogen compounds over nickel-molybdenum sulfide and Molybdenum nitride catalysts /“. The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487942739805674.

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Boldt, Paul Henry. „Room temperature indentation of molybdenum disilicide“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/NQ42836.pdf.

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Konidaris, Peter Christopher. „New cyclopentadienyl imido compounds of molybdenum and tungsten“. Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306573.

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Pratt, David E. „Properties of biological copper, molybdenum and nickel compounds“. Thesis, De Montfort University, 1985. http://hdl.handle.net/2086/4181.

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Dryden, Neil H. „Chemistry of bis(alkyl) nitrosyl and related complexes of molybdenum and tungsten“. Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30694.

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The reactions of (ɳ⁵-C₅R₅)M(NO)(CO)₂ (R = H, Me; M = Mo, W) with PCl₅ result in the formation of the corresponding (ɳ⁵-C₅R₅)M(NO)(Cl)₂ products in high isolated yields (85-95%). These products have been fully characterized by conventional analytical and spectroscopic techniques including an X-ray crystallographic study of [ɳ⁵-C₅Me₅)Mo(NO)(Cl)₂]₂. Alkylation of the (ɳ⁵-C₅R₅)W(NO)(Cl)₂ compounds with Grignard reagents results in the formation of the corresponding complexes, (ɳ⁵-C₅R₅)W(NO)(R')₂ (R = H, Me; R' = CH₂CM₃, CH₂CM₂Ph: R = Me; R' = p-C₆H₄Me, Ph). An electrochemical study of (ɳ⁵-C₅H₅)W(NO)(CH₂CMe₃)₂, (ɳ⁵-C₅H₅)W(NO)(CH₂CMe₂Ph)₂, and (ɳ⁵-C₅Me₅)W(NO)(p-C₆H₄Me)₂ shows 2 successive, chemically reversible, one electron reductions in THF for each complex. The complexes (ɳ⁵-C₅R₅)W(NO)(R')₂ (R = H; R' = CH₂CMe₃, CH₂CMe₂Ph: R = Me; R' = CH₂CMe₂Ph,p-C₆H₄Me) react with 1 atm of CO resulting in the formation of the singly inserted products (ɳ⁵-C₅R₅)W(NO){C(O)R'}(R') in good yields, presumably via initial CO coordination. These acyl complexes have been completely characterized by conventional techniques. The IR and NMR spectroscopic properties of these complexes are indicative of an ɳ²-acyl coordination mode for all of the acylalkyl and acylaryl products. Under 6 atm of CO the (ɳ⁵-C₅H₅)W(NO)(R')₂ (R' = CH₂CMe₃, CH₂CM₂Ph) complexes are doubly carbonylated to form the corresponding (ɳ⁵-C₅H₅)W(NO){C(O)R'}₂ products. Furthermore, (ɳ⁵-C₅Me₅)W(NO){C(O)p-C₆H₄Me}(p-C₆H₄Me) reacts to form (ɳ⁵-C₅Me₅)W(NO)(CO){C(O)p-C₆H₄Me}(p-C₆H₄Me) under 6 atm of CO, but there is no evidence for the formation of a bis(acyl) product. A preliminary X-ray crystallographic investigation of (ɳ⁵-C₅H₅)W(NO){C(O)CH₂CMe₂Ph}₂ reveals the presence of one ɳ²-acyl ligand and one ɳ¹acyl ligand. The ¹H and ¹³C{¹H} NMR spectra of the (ɳ⁵-C₅H₅)W(NO){C(O)R'}₂ compounds exhibit signals for only one type of acyl ligand, indicating that the complexes are stereochemically non-rigid in solution through a process which averages the signals for the ɳ¹and ɳ³- acyl ligands. The bis(benzyl) complexes, (ɳ⁵-C₅R₅)M(NO)(CH₂Ar)₂ (R = H, Me; M = Mo, W; Ar = Ph, p-Tol), react with HCl to form (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ar)(Cl) complexes. These complexes have been reacted with Grignard reagents, R'MgCl, to form the corresponding (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ar)(R') (R' = CH₂SiMe₃, CH₂CMe₃, p-Tol) products. The benzyl ligand in all of these complexes is coordinated in an ɳ²-fashion, similar to that seen in the solid-state molecular structures of the bis(benzyl) precursors. The coordination mode of the benzyl ligands has been confirmed by solid-state molecular structure determinations of the representative examples (ɳ⁵-C₅Me₅)Mo(NO)(CH₂Ph)(Cl) and (ɳ⁵-C₅Me₅)Mo(NO)(CH₂Ph)(CH₂SiMe₃). The ¹H and ¹³C{¹H} NMR spectroscopic data for all of the complexes are discussed, with focus on the diagnostic characteristics for the ɳ²-benzyl ligand. A possible qualitative interpretation for the symmetric ɳ²-bonding mode in these complexes is presented. The (ɳ⁵-C₅Me₅)M(NO)( ɳ²-CH₂Ph)(Cl) (M = Mo, W) complexes react with AgBF₄ in CH₃CN to form electrophilic complexes of the type [(ɳ⁵-C₅Me₅)M(NO)( ɳ²-CH₂Ph)(NCCH₃)]BF₄. The solid-state molecular structures of these complexes are discussed and contrasted with those found for the neutral ɳ²-benzyl complexes. The reaction of racemic AgO₂CCH(Et)(Ph) with the (ɳ⁵-C₅R₅)M(NO)( ɳ²-CH₂Ph)(Cl) (R = H, Me; M = Mo, W: R = H; M = Mo) compounds forms the corresponding diastereomeric (ɳ⁵-C₅R₅)M(NO)( ɳ¹-CH₂Ph)(O₂CCH(Et)(Ph)) products. The ɳ¹ coordination of the benzyl ligand and bidentate coordination of the carboxylate ligand are established by the IR, ¹H, and ¹³C{¹H} NMR spectroscopic data for these products. A mixture of two diasteromeric products is demonstrated by the ¹H and ¹³C{¹H} NMR spectroscopic data and initial attempts to separate these diastereomers by crystallization are described.
Science, Faculty of
Chemistry, Department of
Graduate
9

Hollandsworth, Carl Burton. „Full and half sandwich compounds of dimolybdenum and ditungsten“. Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1095455882.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xxi, 215 p.; also includes graphics (some col.). Includes bibliographical references (p. 209-215).
10

Oloye, Femi Francis. „Synthesis and characterisation of zirconia supported molybdenum oxide and molybdenum carbide catalysts for hydroconversion of n-heptane“. Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=230933.

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The current upgrading catalysts are mainly based on the use of expensive noble metals, which are subject to deactivation due to sintering and coking. An alternative would be to introduce a non-noble metal-based catalyst. In this work, supported molybdenum carbide based systems have been assessed for this purpose. These catalysts were formed by impregnation of zirconia (and zirconium hydroxide) and sulfated zirconia (and zirconium hydroxide) with different loadings of MoO3, with an aim of finding a balance between acid sites and metal-like sites (a site capable of performing dehydrogenation and hydrogenation function without necessarily being a metal). The synthesised catalysts were carburised between 823 and 1123 K using a mixture of methane and hydrogen (4:1) in an attempt to obtain β-Mo2C/ZrO2 or β-Mo2C/S ZrO2. Carburisation at 923 K and above resulted in molybdenum carbide with minimal or no oxygen contents. The conversion and specific rate increased with temperature. Conversion was inversely proportional to space velocity. Analysis of the products distribution as a function of conversion implies that the reaction did not simply follow a consecutive reaction pathway, but that other parallel routes were involved. Conversion increased the research octane number (RON) to ca. 66 due to the increased fraction of pentane isomers. Catalyst carburised at 823 K was approximately four times more active compared to those carburised at 923 K and above, but were of similar activity with Pt/sulfated zirconia. The non-noble metal based catalysts were stable at the reaction temperature while the Pt/sulfated zirconia catalyst deactivates.
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Bücher zum Thema "Molybdenum compounds":

1

R, Braithwaite E., und Haber Jerzy, Hrsg. Molybdenum: An outline of its chemistry and uses. Amsterdam: Elsevier, 1994.

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2

Xiang, Tiegen. Mu ye jin. 8. Aufl. Changsha Shi: Zhong nan da xue chu ban she, 2009.

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1904-, Tananaev Ivan Vladimirovich, und Trunov V. K, Hrsg. Soedinenii͡a︡ redkozemelʹnykh ėlementov. Moskva: "Nauka", 1991.

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Pratt, David E. Properties of biological copper, molybdenum and nickel compounds. Leicester: Leicester Polytechnic, School of Chemistry, 1985.

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Karov, Z. G. Rastvorimostʹ i svoĭstva rastvorov soedineniĭ molibdena i volʹframa: Spravochnik. Novosibirsk: VO "Nauka", 1993.

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Gao, Zhaokui. Qilian zao shan dai yu hua gang yan you guan de wu mu duo jin shu cheng kuang xi tong: Qilian zaoshandai yu huagangyan youguan de wumu duojinshu chengkuang xitong. 8. Aufl. Wuhan Shi: Zhongguo di zhi da xue chu ban she, 2011.

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S, Eliseev S., Solozhenkin P. M und Instituti khimii͡a︡i ba nomi V.I. Nikitin., Hrsg. Khloridy i khlorokisi molibdena i volʹframa. Dushanbe: Izd-vo "Donish", 1989.

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Cittaro, Riccardo. Studies of mono and dihydroxamic acids and their reactions with vanadium and molybdenum compounds. Dublin: University College Dublin, 1996.

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United States International Trade Commission. In the matter of certain ammonium octamolybdate isomers: Investigation no. 337-TA-477. Washington, DC: U.S. International Trade Commission, 2004.

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Neary, Michelle Catherine. Molybdenum, Tungsten and Nickel Compounds as Catalysts for the Dehydrogenation of Formic Acid. [New York, N.Y.?]: [publisher not identified], 2016.

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Buchteile zum Thema "Molybdenum compounds":

1

Parker, Gordon A. „Molybdenum“. In Anthropogenic Compounds, 217–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-540-39468-6_6.

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Macintyre, J. E. „Mo Molybdenum“. In Dictionary of Organometallic Compounds, 227–35. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-6847-6_31.

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MacIntyre, Jane E. „Mo Molybdenum“. In Dictionary of Organometallic Compounds, 144–51. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4899-6848-7_34.

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Macintyre, J. E., F. M. Daniel, D. J. Cardin, S. A. Cotton, R. J. Cross, A. G. Davies, R. S. Edmundson et al. „Mo Molybdenum“. In Dictionary of Organometallic Compounds, 121–26. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-4966-3_34.

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Nagy, Zoltán. „Mo—Molybdenum“. In Electrochemical Synthesis of Inorganic Compounds, 259–65. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-0545-1_39.

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Green, M. „Mo Molybdenum“. In Organometallic Compounds of the Lanthanides, Actinides and Early Transition Metals, 93–117. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-7164-7_16.

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Burgmayer, Sharon J. Nieter, Benjamin R. Williams und Partha Basu. „CHAPTER 2. Pterin-Inspired Model Compounds of Molybdenum Enzymes“. In Molybdenum and Tungsten Enzymes, 8–67. Cambridge: Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/9781782628828-00008.

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Pakhira, Bholanath, Rudra Sarkar und Sabyasachi Sarkar. „CHAPTER 3. Electron Transfer Mechanisms in Molybdenum and Tungsten Model Compounds“. In Molybdenum and Tungsten Enzymes, 68–93. Cambridge: Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/9781782628828-00068.

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Sugimoto, Hideki. „CHAPTER 6. Synthesis of Mono- and Bisdithiolene Molybdenum and Tungsten Model Compounds“. In Molybdenum and Tungsten Enzymes, 166–93. Cambridge: Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/9781782628828-00166.

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Kirk, Martin L. „CHAPTER 2. Spectroscopic and Electronic Structure Studies of Mo Model Compounds and Enzymes“. In Molybdenum and Tungsten Enzymes, 13–67. Cambridge: Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/9781782628842-00013.

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Konferenzberichte zum Thema "Molybdenum compounds":

1

Oldiges, Donald, und Scott Hamilton. „Moly Disulfide in Bolting Applications“. In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63361.

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Molybdenum disulfide (MoS2) is a popular lubricant, however a study completed in the early 1990’s stated that this type of lubricant can lead to stress corrosion cracking (SSCC) of the bolting materials. However, over the past 20 years, many bolting applications using molybdenum disulfide based compounds have been found to provide better galling resistance to the bolt assembly than many other components. It has also been shown to have a few other less desirable traits such as potential for corrosion in specific environments. Therefore, for successful bolting applications one must consider all the pros and cons of the anti-seize compound they select. One of the negative properties of molybdenum compounds is their link to SSCC on some alloys in specific environmental conditions. This paper focuses on corrosion potential.
2

Фатимат Адраевна, Атабиева,, und Отарова, Асият Салиховна. „MOLYBDENUM COMPOUNDS IN THE WATER OF THE RIVERS OF THE CENTRAL CAUCASUS“. In Наука и научный потенциал - основа устойчивого развития государства: сборник статей международной научной конференции (Валдай, Ноябрь 2022). Crossref, 2022. http://dx.doi.org/10.37539/221114.2022.11.51.002.

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Тяжелые металлы - широко распространенные загрязнители. Вертикальная зональность исследуемой территории, многообразие подстилающих горных пород и почв водосборных площадей рек предопределяют повышенное содержание тяжелых металлов в воде рек Центрального Кавказа - Малка, Баксан, Черек, Терек, Нальчик, Куркужин и Лескен. В указанных реках методом атомно-абсорбционной спектрометрии с использованием электротермического атомизатора «МГА-915М» определены концентрации соединений молибдена. В воде почти всех рек по соединениям молибдена наблюдаются превышения предельно допустимых концентраций вредных веществ в водах водных объектов рыбохозяйственного значения (ПДК). Heavy metals are widespread pollutants. The vertical zonality of the studied territory, the variety of underlying rocks and soils of the catchment areas of rivers determine the increased content of heavy metals in the water of the rivers of the Central Caucasus - Malka, Baksan, Cherek, Terek, Nalchik, Kurkuzhin and Lesken. Concentrations of molybdenum compounds were determined in these rivers by atomic absorption spectrometry using the MGA-915M electrothermal atomizer. In the water of almost all rivers, molybdenum compounds exceed the maximum permissible concentrations of harmful substances in the waters of fishery water bodies (PDK).
3

Babayan, E. „241. Health Status in Workers Occupationally Exposed to Molybdenum and Its Compounds“. In AIHce 2002. AIHA, 2002. http://dx.doi.org/10.3320/1.2766170.

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4

Kotelnikova, Alexandra A., Alexander G. Karengin und Orlando Mendoza. „Plasmachemical synthesis and evaluation of the thermal conductivity of metal-oxide compounds “Molybdenum–uranium dioxide”“. In IV INTERNATIONAL CONFERENCE FOR YOUNG SCIENTISTS, POST-GRADUATE STUDENTS AND STUDENTS: Isotopes: Technologies, Materials and Application (ITMA-2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5027222.

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5

Babayan, E., V. Kogan, R. Bumazian, V. Gabuchian, R. Hovhanessian, M. Sianozova und L. Saryan. „157. Biochemical and Hormonal Disorders in Workers Occupationally Exposed to Molybdenum Dust and its Compounds“. In AIHce 1999. AIHA, 1999. http://dx.doi.org/10.3320/1.2762991.

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6

Атабиева, Фатимат Адраевна, und Елена Александровна Чередник. „MONITORING THE LEVEL OF HEAVY METAL COMPOUNDS IN THE TEREK RIVER“. In Научные исследования в современном мире. Теория и практика: сборник избранных статей Всероссийской (национальной) научно-практической конференции (Санкт-Петербург, Декабрь 2020). Crossref, 2020. http://dx.doi.org/10.37539/nitp312.2020.15.43.011.

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В статье представлен анализ многолетних результатов (2005-2020 годы) изменчивости уровня содержания соединений таких тяжелых металлов как хром, никель, молибден, свинец, цинк и марганец. Цель исследования - выявление и оценка степени загрязненности воды реки Терек растворенными формами металлов в среднем и нижнем течении в летнее половодье по частоте превышения ПДК. The article presents an analysis of long-term results (2005-2020) of variability in the content of compounds of such heavy metals as chromium, nickel, molybdenum, lead, zinc and manganese. The purpose of the study is to identify and assess the degree of water pollution of the Terek River by dissolved forms of metals in the middle and lower reaches during the summer flood in terms of the frequency of exceeding the MPC.
7

Vesely, Andreas. „Processes for the Treatment of NORM and TENORM“. In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4623.

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By contract with the Austrian government, the ARC is treating radioactive waste from research institutions and industries. In the last years, one focus was the development of processes for the treatment of NORM and TENORM. Our goal in developing such processes is to recycle valuable compounds for further industrial usage and to concentrate the radioactive elements as far as possible, to save space in the waste storage facilities. Austria is an important producer of tungsten-thoria- and tungsten-molybdenum-thoria-cermets. Scrap is generated during the production process in the form of turnings and grinding sludge and dust. Although big efforts have been undertaken to replace Thorium compounds, waste streams from past production processes are still waiting for treatment. The total amount of this waste stored in Austria may be estimated to be approx. 100 tons. In close co-operation with the tungsten industries, recycling processes were tested and further developed at ARC in laboratory, bench scale and pilot plants. Three different approaches to solve the problem were studied: Dissolution of tungsten in molten iron in an arc or induction furnace, thus producing an Fe-W or Fe-W-Mo alloy. Slag is produced upon the addition of lime and clay. This slag extracts nearly all of the Thorium contained in the metal melt. Selective dissolution of Tungsten in aqueous alkaline medium after oxidation of the metal to the hexavalent state by heating the scrap in air at temperatures of 500°C to 600°C. The resulting oxides are treated with sodium hydroxide solution. Tungsten and Molybdenum oxides are readily dissolved, while Thorium oxide together with silicon and aluminum compounds remain insoluble and are separated by filtration. Sodium tungstate solution is further processed by the usual hydrometallurgical tungsten mill process. Oxidation and dissolution of Tungsten can be achieved in one step by an electrochemical process. Thus, thoriated Tungsten scrap is used as an anode in an electrolysis cell, while sodium hydroxide or ammonia serve as electrolyte. After dissolution of Tungsten, the solids are separated from the liquid by filtration. With the electrochemical process, treatment of Tungsten-Thoria scrap can be achieved with high throughput in rather small reactors at moderate temperatures and ordinary pressure. The Tungsten solution exhibits high purity. Another process which we examined in detail is the separation of radium from rare earth compounds. Radium was separated by co-precipitation with barium sulfate from rare earth chloride solutions. The efficiency of the separation is strongly pH-dependent. Again, the valuable rare earth compound can be reused, and the radioactive elements are concentrated.
8

Waku, Yoshiharu, Narihito Nakagawa, Kenji Kobayashi und Shinya Yokoi. „Development of Near-Net Shape Casting Technology for MGC Components“. In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68398.

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Much attention has been paid to unidirectionally solidified ceramic composites as a candidate for a high-temperature structural material. Eutectic composites, known as Melt Growth Composites (MGCs), have recently been developed. The MGCs (Al2O3/YAG, Al2O3/GAP binary and Al2O3/YAG/ZrO2 ternary systems) have a novel microstructure consisting of three-dimensionally continuous and complexly entangled single-crystal Al2O3 and single-crystal oxide compounds (YAG or GAP or YAG and ZrO2). Therefore, the MGCs have excellent high-temperature strength characteristics, creep resistance, superior oxidation resistance and thermal stability in an air atmosphere at very high temperatures. Manufacturing processes for the MGCs (Al2O3/YAG and Al2O3/GAP binary systems) are being examined under a Japanese national project, scheduled from 2001–2005. The molybdenum mold for near-net-shaped casting of the gas turbine component was fabricated by plasma spraying the molybdenum powders on the copper model. Near-net-shape casting of MGCs is being examined under the NEDO project using the plasma sprayed mold and a new Bridgman-type furnace.
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Pershin, Yu P., E. A. Bugaev, I. A. Kopilets, S. A. Yulin und I. V. Kozhevnikov. „ATTAINMENT OF PHASE EQUILBRIUM IN MULTILAYERS“. In Physics of X-Ray Multilayer Structures. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/pxrayms.1994.wa.4.

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Structural, phase and chemical stabilities of multilayers Mo-Si, MOSi2- Si, W-Si, WSi2-Si, Cr-Sc, W-Sc, Mo-B4C, Mo−(B+C), Mo2B5-B4C, Cr3C2-C, TiC-C, Ti-Be and others were studied in 300-1100°C temperature range by small-angle and large-angle X-ray diffraction scattering and electron microscopy methods. The structural instability (crystallization of amorphous Si, C, MOSi2, WSi2, MoC, MoB2, Mo2B5, B and Cr3 C2 and recrystal-lization of polycrystal Mo, W, Sc, MoSi2, WSi2, Mo2B5 and MoC layers) as well as the phase instability (transformation of MoSi2 lattice from hexagonal to tetragonal modification) are responsible for the degradation of multilayers due to the development of the interface roughness and mechanical stresses. The chemical instability (formation of MoSi2 and WSi2 silicides at interfaces of Mo-Si and W-Si multilayers, Mo2C and MoC carbides and MoB2 and Mo2B5 borides in Mo-(B+C) multilayers, TiBe12 in Ti-Be ones) influences critically chemical composition profile, layer thicknesses and a period of multilayers. Formation of chemical compounds accompanied by an amorphization of polycrystal layers (growth of amorphous Mo2C and MoC carbides instead of polycrystal Mo at about 450 °C and the subsequent substitution of polycrystal molybdenum carbides on amorphous borides MoB2 and Mo2B5 at 700-800 °C in Mo-(B+C) multilayers) promotes the smoothening of interfaces. This effect of the chemical instability can be used for an improving of the X-ray reflectivity of multilayers.
10

Wachowiak, Devin M., und Jason D. Wilson. „A Review of Experiences With AL-6XN® and Zeron® 100 Alloys in Air Pollution Control Systems“. In ASME 2010 Power Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/power2010-27187.

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Coal fired power plants are faced with increasingly strict air quality control laws and EPA rules. New multi-pollutant legislation is controlling a wider range of emissions, especially sulfur compounds. A significant number of flue gas desulfurization (FGD) units worldwide employ wet scrubbing to reduce sulfur dioxide emissions by more than 90 percent. Wet scrubbing has also been found to be effective at removing mercury in many cases. Due to the inherent contaminants generated by the combustion of coal, wet FGD’s require the use of corrosion resistant materials in their construction. A variety of metallic corrosion resistant alloys are currently used in these pollution control systems. This paper will review the use of AL-6XN and Zeron 100 alloys in various FGD applications around the world. Examples of AL-6XN and Zeron 100 in actual service in FGD units will be presented. AL-6XN and Zeron 100 are alloys that have been chosen for these systems when conditions are too severe for either 316L stainless steel or 2205 duplex stainless steel. Experimental data will be reviewed that supports the use of these alloys in the high chloride containing environments encountered by the many components of the pollution control systems. AL-6XN and Zeron 100 alloys have proven to be cost effective materials of construction that fill the gap between the lower alloyed stainless steels such as 317L, 904L, and 2205, and the high molybdenum and nickel based alloys such as C-276. As AL-6XN and Zeron 100 alloys are established materials of construction, they are readily available in product forms necessary to complete an FGD system.

Berichte der Organisationen zum Thema "Molybdenum compounds":

1

Spink, D. Synthesis, characterization, and reactivity of sulfided hexanuclear molybdenum cluster compounds. Office of Scientific and Technical Information (OSTI), September 1990. http://dx.doi.org/10.2172/6562551.

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