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Cerium(IV) oxide occurs naturally as the mineral cerianite-(Ce). [16] [17] It is a rare example of tetravalent cerium mineral, the other examples being stetindite-(Ce) and dyrnaesite-(La). The "-(Ce)" suffix is known as Levinson modifier and is used to show which element dominates in a particular site in the structure. [18]
It exists as the anhydrous salt Ce(SO 4) 2 as well as a few hydrated forms: Ce(SO 4) 2 (H 2 O) x, with x equal to 4, 8, or 12. These salts are yellow to yellow/orange solids that are moderately soluble in water and dilute acids. Its neutral solutions slowly decompose, depositing the light yellow oxide CeO 2. Solutions of ceric sulfate have a ...
The anion [Ce(NO 3) 6] 2− has T h (idealized O h) molecular symmetry. The CeO 12 core defines an icosahedron. [4] Ce 4+ is a strong one-electron oxidizing agent. In terms of its redox potential (E° ≈ 1.61 V vs. N.H.E.) it is an even stronger oxidizing agent than Cl 2 (E° ≈ 1.36 V). Few shelf-stable reagents are stronger oxidants.
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] Ce 2 (CO 3) 3 + 6 CH 3 COOH → 2 Ce(CH 3 COO) 3 + 3 CO 2 ↑ + 3 H 2 O
The SCE-200 (also referred as Semi-Cryogenic Engine-200) is a 2 MN thrust class liquid rocket engine, being developed to power Indian Space Research Organisation's (ISRO) existing LVM3 and upcoming heavy and super heavy-lift launch vehicles.