Molybdenum trioxide

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  • Identifiers

    CAS number
    1313-27-5

    Molecular formula
    MoO3

    SMILES
    O=[Mo](=O)=O

    Safety labels

    Irritant
    Irritant

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Odorless 89.15%
    Sour 21.64%
    Burnt 20.7%
    Sharp 18.74%
    Pungent 15.1%
    Caramellic 13.11%
    Clean 12.27%
    Bitter 9.9%
    Ethereal 9.68%
    Sweet 8.58%

     

  • Properties

    pKa est.
    -28.17 (strong acid)

    Molecular weight
    143.95 g/mol

    Melting point expt.

    • 1463 °F (NTP, 1992)
    • 795 °C

    Boiling point

    • 2111 °F at 760 mmHg (Sublimes) (NTP, 1992)
    • 1155 °C, SUBLIMES

    Flash point

    • -23.29 ˚C est.

    Solubility expt.

    • less than 1 mg/mL at 75 °F (NTP, 1992)
    • After strong ignition it is very slightly sol in acids
    • 0.490 g/1000 cc water @ 28 °C
    • Sol in concentrated mineral acids
    • Sol in soln of alkali hydroxides and soln of potassium bitartrate
    • 1.066 g/l water @ 18 °C
    • 20.55 g/l water @ 70 °C

  • Synonyms

    • MOLYBDENUM TRIOXIDE
    • 1313-27-5
    • Molybdenum(VI) oxide
    • trioxomolybdenum
    • Molybdenum oxide (MoO3)
    • Molybdic anhydride
    • Molybdic trioxide
    • Molybdena
    • Molybdic oxide
    • MoO3
    • Molybdic acid anhydride
    • Molybdenum peroxide
    • Molybdenumperoxide
    • Natural molybdite
    • Molybdenum oxide (MoO5)
    • Mo-1202T
    • CCRIS 1163
    • HSDB 1661
    • EINECS 215-204-7
    • UNII-22FQ3F03YS
    • NSC 215191
    • 22FQ3F03YS
    • DTXSID7020899
    • Mo 1202T
    • molybdenum(6+) oxide
    • NSC-215191
    • [MoO3]
    • DTXCID30899
    • MOLYBDENUM TRIOXIDE [MI]
    • CHEBI:30627
    • EC 215-204-7
    • MOLYBDENUM TRIOXIDE [HSDB]
    • MOLYBDENUM TRIOXIDE [IARC]
    • EINECS 234-321-4
    • MOLYBDENUM TRIOXIDE [WHO-DD]
    • MFCD00003469
    • 11098-99-0
    • (MoO3)
    • MOLYBDENUM TRIOXIDE (IARC)
    • Molybdenum anhydride
    • Nitinol Foil
    • molybdenum oxides
    • molybdenum(VI)oxide
    • Few Layers MoS2 Powder
    • Molybdenum Oxide nanowire
    • BOUEN SKN 301
    • WLN: MO O3
    • Nano Molybdenum Oxide Powder
    • Molybdenum Trioxide Nanopowder
    • Mo1202T
    • MOLYBDENUM(VI) TRIOXIDE
    • CHEBI:37775
    • Gadolinium (Gd) Sputtering Targets
    • MOLYBDENUM TRIOXIDE PENTAMER
    • MOLYBDENUM TRIOXIDE TETRAMER
    • MOLYBDENUM OXIDE (MO4O12)
    • MOLYBDENUM OXIDE (MO5O15)
    • Tox21_202785
    • NSC215191
    • AKOS015904164
    • FM16012
    • Molybdenum Oxide Powder, 99.5% Nano
    • Molybdenum oxide nanopowder (<100 nm)
    • Molybdenum(VI) oxide, p.a., 99.0%
    • NCGC00260331-01
    • CAS-1313-27-5
    • MOLYBDENUM OXIDE (MOO3), TETRAMER
    • NS00081390
    • Molybdenum(VI) oxide, puriss. p.a., 99.5%
    • Molybdenum(VI) oxide, Vetec(TM) reagent grade
    • Single Layer Monlybdenum Disulfide Nano Powder
    • Molybdenum(VI) oxide, ACS reagent, >=99.5%
    • Molybdenum(VI) oxide, 99.97% trace metals basis
    • Molybdenum(VI) oxide, ReagentPlus(R), >=99.5%
    • Q416416
    • Molybdenum(VI) oxide, p.a., ACS reagent, 99.5%
    • Few Layers Mlybdenum Disulfide Dispersion(C: 0.1mg/ml, solvent: ethanol)
    • Few Layers Mlybdenum Disulfide Dispersion(C: 0.1mg/ml, solvent: water)
    • Few Layers Mlybdenum Disulfide Dispersion(C: 1mg/ml, solvent: ethanol)
    • Few Layers Mlybdenum Disulfide Dispersion(C: 1mg/ml, solvent: water)
    • Molybdenum(VI) oxide, nanopowder, 100 nm (TEM), 99.5% trace metals basis
    • 215-204-7
    • 234-321-4
    • 235-026-3

  • Applications

    Molybdenum trioxide (CAS 1313-27-5) is used primarily as a catalyst precursor and support in industrial processes, notably for oxidation catalysts and as a precursor to MoS2-based catalysts and lubricants. It serves as a source of molybdenum for the synthesis of MoS2-containing lubricants and MoS2-based catalysts. In electronics, MoO3 is employed as a high-work-function hole-injection layer in organic electronics, including OLEDs and organic photovoltaics. In ceramics and glass, it functions as a yellow pigment and helps with glaze behavior during firing. Additionally, MoO3 can be used as a precursor for molybdenum-containing coatings and films for specialized applications in coatings and inks.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 486.14
    methanol 625.72
    isopropanol 436.11
    water 157.5
    ethyl acetate 215.27
    n-propanol 334.72
    acetone 500.77
    n-butanol 312.88
    acetonitrile 324.5
    DMF 1115.77
    toluene 112.78
    isobutanol 230.58
    1,4-dioxane 381.44
    methyl acetate 231.92
    THF 623.2
    2-butanone 285.12
    n-pentanol 221.47
    sec-butanol 334.68
    n-hexane 85.03
    ethylene glycol 335.4
    NMP 569.7
    cyclohexane 88.31
    DMSO 1148.25
    n-butyl acetate 113.77
    n-octanol 167.44
    chloroform 322.73
    n-propyl acetate 140.45
    acetic acid 310.41
    dichloromethane 355.62
    cyclohexanone 222.57
    propylene glycol 242.92
    isopropyl acetate 165.71
    DMAc 697.9
    2-ethoxyethanol 405.91
    isopentanol 232.33
    n-heptane 75.77
    ethyl formate 201.67
    1,2-dichloroethane 291.16
    n-hexanol 195.02
    2-methoxyethanol 743.98
    isobutyl acetate 82.13
    tetrachloromethane 128.66
    n-pentyl acetate 132.28
    transcutol 379.53
    n-heptanol 159.82
    ethylbenzene 79.6
    MIBK 183.29
    2-propoxyethanol 347.8
    tert-butanol 492.95
    MTBE 312.71
    2-butoxyethanol 247.51
    propionic acid 200.56
    o-xylene 115.01
    formic acid 304.59
    diethyl ether 397.62
    m-xylene 111.27
    p-xylene 86.66
    chlorobenzene 107.29
    dimethyl carbonate 202.9
    n-octane 47.64
    formamide 474.92
    cyclopentanone 329.17
    2-pentanone 286.76
    anisole 174.76
    cyclopentyl methyl ether 316.54
    gamma-butyrolactone 319.8
    1-methoxy-2-propanol 568.33
    pyridine 234.56
    3-pentanone 225.57
    furfural 329.95
    n-dodecane 38.65
    diethylene glycol 397.02
    diisopropyl ether 163.05
    tert-amyl alcohol 357.07
    acetylacetone 265.13
    n-hexadecane 41.06
    acetophenone 155.0
    methyl propionate 237.59
    isopentyl acetate 96.02
    trichloroethylene 295.3
    n-nonanol 149.08
    cyclohexanol 235.02
    benzyl alcohol 152.61
    2-ethylhexanol 116.39
    isooctanol 121.66
    dipropyl ether 174.73
    1,2-dichlorobenzene 117.09
    ethyl lactate 126.87
    propylene carbonate 172.85
    n-methylformamide 472.05
    2-pentanol 282.24
    n-pentane 136.07
    1-propoxy-2-propanol 253.18
    1-methoxy-2-propyl acetate 143.92
    2-(2-methoxypropoxy) propanol 184.88
    mesitylene 91.63
    ε-caprolactone 190.02
    p-cymene 70.32
    epichlorohydrin 368.73
    1,1,1-trichloroethane 226.54
    2-aminoethanol 345.62
    morpholine-4-carbaldehyde 498.23
    sulfolane 473.75
    2,2,4-trimethylpentane 56.26
    2-methyltetrahydrofuran 368.25
    n-hexyl acetate 156.34
    isooctane 48.47
    2-(2-butoxyethoxy)ethanol 242.16
    sec-butyl acetate 97.45
    tert-butyl acetate 194.11
    decalin 41.31
    glycerin 390.25
    diglyme 377.01
    acrylic acid 195.39
    isopropyl myristate 94.35
    n-butyric acid 223.15
    acetyl acetate 123.28
    di(2-ethylhexyl) phthalate 81.89
    ethyl propionate 149.31
    nitromethane 455.64
    1,2-diethoxyethane 181.03
    benzonitrile 123.25
    trioctyl phosphate 79.69
    1-bromopropane 216.26
    gamma-valerolactone 339.95
    n-decanol 122.27
    triethyl phosphate 84.35
    4-methyl-2-pentanol 163.96
    propionitrile 214.01
    vinylene carbonate 150.83
    1,1,2-trichlorotrifluoroethane 324.24
    DMS 115.92
    cumene 68.44
    2-octanol 139.2
    2-hexanone 162.83
    octyl acetate 114.54
    limonene 98.11
    1,2-dimethoxyethane 510.92
    ethyl orthosilicate 87.8
    tributyl phosphate 76.81
    diacetone alcohol 283.64
    N,N-dimethylaniline 184.08
    acrylonitrile 254.62
    aniline 164.69
    1,3-propanediol 400.58
    bromobenzene 103.72
    dibromomethane 285.37
    1,1,2,2-tetrachloroethane 303.68
    2-methyl-cyclohexyl acetate 96.13
    tetrabutyl urea 121.32
    diisobutyl methanol 98.29
    2-phenylethanol 136.13
    styrene 92.05
    dioctyl adipate 110.21
    dimethyl sulfate 321.48
    ethyl butyrate 108.88
    methyl lactate 223.71
    butyl lactate 117.69
    diethyl carbonate 83.13
    propanediol butyl ether 216.26
    triethyl orthoformate 97.48
    p-tert-butyltoluene 78.06
    methyl 4-tert-butylbenzoate 178.76
    morpholine 446.21
    tert-butylamine 338.99
    n-dodecanol 103.48
    dimethoxymethane 704.33
    ethylene carbonate 130.26
    cyrene 184.07
    2-ethoxyethyl acetate 141.78
    2-ethylhexyl acetate 84.57
    1,2,4-trichlorobenzene 130.23
    4-methylpyridine 221.83
    dibutyl ether 134.26
    2,6-dimethyl-4-heptanol 98.29
    DEF 372.1
    dimethyl isosorbide 247.26
    tetrachloroethylene 243.77
    eugenol 191.53
    triacetin 136.62
    span 80 169.7
    1,4-butanediol 200.76
    1,1-dichloroethane 255.41
    2-methyl-1-pentanol 164.12
    methyl formate 345.04
    2-methyl-1-butanol 216.03
    n-decane 54.93
    butyronitrile 203.25
    3,7-dimethyl-1-octanol 122.45
    1-chlorooctane 108.96
    1-chlorotetradecane 61.79
    n-nonane 56.31
    undecane 44.93
    tert-butylcyclohexane 42.92
    cyclooctane 50.74
    cyclopentanol 297.14
    tetrahydropyran 298.51
    tert-amyl methyl ether 275.47
    2,5,8-trioxanonane 307.12
    1-hexene 135.26
    2-isopropoxyethanol 278.52
    2,2,2-trifluoroethanol 198.15
    methyl butyrate 170.73

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction