이산화 몰리브덴
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이산화 몰리브덴 속성
- 녹는점
- decomposes [JAN85]
- 밀도
- 6.47 g/mL at 25 °C (lit.)
- 용해도
- insoluble in H2O, acid solutions, alkaline solutions
- 물리적 상태
- 가루
- 색상
- 적갈색
- Specific Gravity
- 6.47
- 수용성
- 약간 용해되는 H2SO4; 용해되지 않음 HCl, HF 및 알칼리 [HAW93]
- Crystal Structure
- MoO2 type
- crystal system
- Monoclinic
- Space group
- P21/c
- Lattice constant
a/nm b/nm c/nm α/o β/o γ/o V/nm3 0.55388 0.48562 0.56285 90 119.683 90 0.1315
- 노출 한도
- ACGIH: TWA 10 mg/m3; TWA 3 mg/m3
NIOSH: IDLH 5000 mg/m3
- InChIKey
- QXYJCZRRLLQGCR-UHFFFAOYSA-N
- CAS 데이터베이스
- 18868-43-4(CAS DataBase Reference)
안전
- 위험 및 안전 성명
- 위험 및 사전주의 사항 (GHS)
위험품 표기 | Xn | ||
---|---|---|---|
위험 카페고리 넘버 | 20/21/22-36/37/38 | ||
안전지침서 | 26-36 | ||
WGK 독일 | 1 | ||
RTECS 번호 | QA4688000 | ||
TSCA | Yes | ||
HS 번호 | 28257000 | ||
독성 | mouse,LD50,subcutaneous,318mg/kg (318mg/kg),Zhurnal Vsesoyuznogo Khimicheskogo Obshchestva im. D.I. Mendeleeva. Journal of the D.I. Mendeleeva All-Union Chemical Society. Vol. 19, Pg. 186, 1974. | ||
기존화학 물질 | KE-25436 |
이산화 몰리브덴 C화학적 특성, 용도, 생산
화학적 성질
Lead-gray, nonvolatile powder. Dapproximately 6.4. Insoluble in hydrochloric acidand hydrogen fluoride and alkalies, sparingly solu-ble in sulfuric acid.물리적 성질
Molybdenum(IV) oxide can be prepared by several methods including controlled oxidation of Mo and controlled reduction of MoO3 with hydrogen. The pure oxide suitable for structure determination has been prepared by electrolysis of a polymolybdate (K2O5.MoO3) solution. Molybdenum(IV) oxide is insoluble in water: it is inert in solutions of nonoxidizing acids or bases, but is dissolved by oxidizing solutions. It dissociates to Mo and MoO3 at high temperatures (~ 1100°).Crystalline MoO2 is violet or brown. Its deformed rutile structure consists of infinite chains of MoO6 octahedra sharing opposite edges along the chain direction with Mo-Mo distances alternately long (3.10 A) and short (2.50 A). It is diamagnetic and semiconducting ; metal-metal bonds are present. Some of its thermodynamic properties are as follows: G°f29% ~ 172.415 kcal/mole H°f29% -140.5 kcal/mole S°298 11.954 gibbs/mole.
용도
Molybdenum(IV) oxide (MoO2) is a transition metal oxide with good electrical conductivity due to the presence of delocalized electrons in its valence band. It is traditionally prepared by reducing MoO3 in dry hydrogen in the temperature range of 450-550°C.MoO2 can be used in a variety of energy based applications such as an anode material in rechargeable lithium batteries and fuel flexible solid oxide fuel cells.It can also be used as a catalyst in hydrogen reforming processes.
제조 방법
Molybdenum(IV) oxide is obtained by passing steam over red hot molybdenum:Mo + 2H2O → MoO2 + 2H2
Alternatively, the oxide may be prepared by heating a molybdate salt, such as ammonium molybdate, with a reducing agent such as zinc. The dioxide also may be obtained along with other oxides of molybdenum when molybdenum metal is heated in air.
A brown-black suspension of MoO2 in hydrate form may be obtained by reducing a solution of ammonium molybdate with hydrogen in the presence of colloidal palladium.
일반 설명
Molybdenum(IV) oxide (MoO2) is a transition metal oxide with good electrical conductivity due to the presence of delocalized electrons in its valence band. It is traditionally prepared by reducing MoO3 in dry hydrogen in the temperature range of 450-550°C.위험도
Toxic material.Safety Profile
Poison by subcutaneous route. Incandescent reaction with air. When heated to decomposition it emits toxic fumes of Mo.이산화 몰리브덴 준비 용품 및 원자재
원자재
준비 용품
이산화 몰리브덴 공급 업체
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