Английская Википедия:Cerium(IV) hydroxide
Шаблон:Chembox Cerium(IV) hydroxide, also known as ceric hydroxide, is an inorganic compound with the chemical formula Ce(OH)4. It is a yellowish powder that is insoluble in water but soluble in concentrated acids.[1]
Production
Cerium(IV) hydroxide can be produced by reacting cerium(III) carbonate and acetic acid, then oxidizing it with hydrogen peroxide in base. The reactions are:[2]
- Ce2(CO3)3 + 6 CH3COOH → 2 Ce(CH3COO)3 + 3 CO2↑ + 3 H2O
- 2 Ce(CH3COO)3 + 3 H2O2 + 4 H2O → 2 Ce(OH)3(OOH) + 6 CH3COOH
- CH3COOH + NaOH → CH3COONa + H2O
- 2 Ce(OH)3(OOH) → 2 Ce(OH)4↓ + O2↑
The net equation is：
- Ce2(CO3)3 + 6 CH3COOH + 3 H2O2 + 6 NaOH —343 K→ 2 Ce(OH)4 + 6 CH3COONa + O2↑ + 3 CO2↑ + 5 H2O
If using cerium(III) nitrate as ingredient, a similar reaction occurs:[3]
- 2 Ce(NO3)3 + 3 H2O2 + 6 NH3·H2O → 2 Ce(OH)3(OOH)↓ + 6 NH4NO3 + 2 H2O
- Ce(OH)3(OOH) —Δ→ 2 Ce(OH)4↓ + O2↑
It might also prepared by addition of sodium hydroxide or ammonium hydroxide to a Ce4+ solution, being obtained as a gelatinous precipitate described as CeO2·xH2O, (x = 0.5–2). Boiling an insoluble Ce4+ salt in NaOH gives granular Ce(OH)4.[1]
References
Шаблон:Cerium compounds Шаблон:Hydroxides
- ↑ 1,0 1,1 Шаблон:Cite book
- ↑ 钟学明,邓安民,舒红英 等. 氢氧化铈合成的新方法. 过程工程学报. 2005.2. 5(1):74-77
- ↑ 李月红，李树胜，方中心. 高纯氢氧化铈生产工艺研究. 无机盐工业. 2011.9. 43(9): 40-42
