| 词条 | Molybdenum dioxide |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 361075238 | ImageFile = | ImageSize = | IUPACName = Molybdenum(IV) oxide | OtherNames = Molybdenum dioxide Tugarinovite |Section1={{Chembox Identifiers | CASNo = 18868-43-4 | CASNo_Ref = {{cascite|correct|CAS}} | PubChem = 29320 |Section2={{Chembox Properties | Formula = MoO2 | MolarMass = 127.94 g/mol | Appearance = brownish-violet solid | Density = 6.47 g/cm3 | MeltingPtC = 1100 | MeltingPt_notes = decomposes | BoilingPt = | Solubility = insoluble | SolubleOther = insoluble in alkalies, HCl, HF slightly soluble in hot H2SO4 | MagSus = +41.0·10−6 cm3/mol |Section3={{Chembox Structure | CrystalStruct = Distorted rutile (tetragonal) | SpaceGroup = | Coordination = Octahedral (MoIV); trigonal (O−II) |Section4={{Chembox Thermochemistry | DeltaHf = | Entropy = | HeatCapacity = |Section7={{Chembox Hazards | ExternalSDS = | EUClass = | RPhrases = | SPhrases = | MainHazards = | NFPA-H = | NFPA-F = | NFPA-R = | NFPA-S = | FlashPt = Non-flammable | LD50 = | PEL = |Section8={{Chembox Related | OtherAnions = Molybdenum disulfide | OtherCations = Chromium(IV) oxide Tungsten(IV) oxide | OtherFunction = "Molybdenum blue" Molybdenum trioxide | OtherFunction_label = molybdenum oxides | OtherCompounds = }}Molybdenum dioxide is the chemical compound with the formula MoO2. It is a violet-colored solid and is a metallic conductor. It crystallizes in a monoclinic cell, and has a distorted rutile, (TiO2) crystal structure. In TiO2 the oxide anions are close packed and titanium atoms occupy half of the octahedral interstices (holes). In MoO2 the octahedra are distorted, the Mo atoms are off-centre, leading to alternating short and long Mo – Mo distances and Mo-Mo bonding. The short Mo – Mo distance is 251 pm which is less than the Mo – Mo distance in the metal, 272.5 pm. The bond length is shorter than would be expected for a single bond. The bonding is complex and involves a delocalisation of some of the Mo electrons in a conductance band accounting for the metallic conductivity.[1] MoO2 can be prepared :
2 MoO3 + Mo → 3 MoO2
Single crystals are obtained by chemical transport using iodine. Iodine reversibly converts MoO2 into the volatile species MoO2I2.[3] Molybdenum oxide is a constituent of "technical molybdenum oxide" produced during the industrial processing of MoS2:[4][5] 2 MoS2 + 7O2 → 2MoO3 + 4SO2 MoS2 + 6MoO3 → 7MoO2 + 2SO2 2 MoO2 + O2 → 2MoO3 MoO2 has been reported as catalysing the dehydrogenation of alcohols,[6] the reformation of hydrocarbons[7] and biodiesel.[8] Molybdenum nano-wires have been produced by reducing MoO2 deposited on graphite.[9] Molybdenum oxide has also been suggested as possible anode material for Li-ion batteries.[10][11] The mineralogical form of this compound is called tugarinovite, and is only very rarely found. References1. ^Oxides: Solid state chemistry McCarroll W.H. Encyclopedia of Inorganic Chemistry Ed R. Bruce King, (1994), John Wiley & sons {{ISBN|0-471-93620-0}} {{Molybdenum compounds}}{{oxygen compounds}}2. ^{{Cotton&Wilkinson6th}} 3. ^Conroy, L. E.; Ben-Dor, L. "Molybdenum(IV) Oxide and Tungsten(IV) Oxides Single-Crystals" Inorganic Syntheses 1995, volume 30, pp. 105–107. {{ISBN|0-471-30508-1}} 4. ^Metallurgical furnaces Jorg Grzella, Peter Sturm, Joachim Kruger, Markus A. Reuter, Carina Kogler, Thomas Probst, Ullmans Encyclopedia of Industrial Chemistry 5. ^"Thermal Analysis and Kinetics of Oxidation of Molybdenum Sulfides" Y. Shigegaki, S.K. Basu, M.Wakihara and M. Taniguchi, J. Therm. Analysis 34 (1988), 1427-1440 6. ^A. A. Balandin and I. D. Rozhdestvenskaya, Russian Chemical Bulletin, 8, 11, (1959), 1573 {{doi|10.1007/BF00914749 }} 7. ^Molybdenum based catalysts. I. MoO2 as the active species in the reforming of hydrocarbons A. Katrib, P. Leflaive, L. Hilaire and G. Maire Catalysis Letters, 38, 1–2, (1996) {{doi|10.1007/BF00806906}} 8. ^Catalytic partial oxidation of a biodiesel surrogate over molybdenum dioxide, C.M. Cuba-Torres, et al, Fuel (2015), {{doi|10.1016/j.fuel.2015.01.003}} 9. ^Synthesis of Molybdenum Nanowires with Millimeter-Scale Lengths Using Electrochemical Step Edge Decoration M. P. Zach, K. Inazu, K. H. Ng, J. C. Hemminger, and R. M. Penner Chem. Mater. (2002),14, 3206 {{doi|10.1021/cm020249a}} 10. ^{{Cite journal|last=Shi|first=Yifeng|last2=Guo|first2=Bingkun|last3=Corr|first3=Serena A.|last4=Shi|first4=Qihui|last5=Hu|first5=Yong-Sheng|last6=Heier|first6=Kevin R.|last7=Chen|first7=Liquan|last8=Seshadri|first8=Ram|last9=Stucky|first9=Galen D.|date=2009-12-09|title=Ordered Mesoporous Metallic MoO2 Materials with Highly Reversible Lithium Storage Capacity|journal=Nano Letters|volume=9|issue=12|pages=4215–4220|doi=10.1021/nl902423a|pmid=19775084|issn=1530-6984}} 11. ^{{Cite journal|last=Kim|first=Hyung-Seok|last2=Cook|first2=John B.|last3=Tolbert|first3=Sarah H.|last4=Dunn|first4=Bruce|date=2015-01-01|title=The Development of Pseudocapacitive Properties in Nanosized-MoO2|journal=Journal of the Electrochemical Society|language=en|volume=162|issue=5|pages=A5083–A5090|doi=10.1149/2.0141505jes|issn=0013-4651}} 2 : Molybdenum(IV) compounds|Oxides |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。