Cerium oxide usually appears as a yellow powder. It is insoluble in water and moderately soluble in strong mineral acids. CeO2 is slightly hygroscopic and will absorb small amounts of moisture and CO2 from the atmosphere.
Cerium Oxide Chemical Properties Available:
99% min., 99.95%, and 99.99% (REO basis)
Cerium Oxide Physical Properties Available:
Tablets, pieces, granules, and powder
Cerium Oxide Physical Constants:
Molecular Weight (g/mol.)
Apparent Density (g/cm3)
7.65 g/cm3 as a solid
Melting Point (°C)
Boiling Point (°C)
Acute Health Hazard
Mohs Hardness @ 20 °C
Solubility In Water
White or pale yellow solid
Cubic, face centered
Cerium Oxide Typical Applications:
a) Used in precision polishing and lapping applications, escpecially for glass.
b) In the doped form,(it comes from cerium and oxygen) ceria is of interest as a material for solid oxide fuel cells or SOFCs because of its relatively high oxygen ion conductivity (i.e. oxygen atoms readily move through it) at intermediate temperatures (500-800 °C). Undoped and doped ceria also exhibit high electronic conductivity at low partial pressures of oxygen due to the formation of small polarons. However, doped ceria has an extended electrolytic region (area of predominant ionic conductivity), over that of ceria, that allows its use as an electrolyte in SOFCs. Substituting a fraction of the ceria with gadolinium or samarium will introduce oxygen vacancies in the crystal without adding electronic charge carriers. This increases the ionic conductivity and results in a better electrolyte.
c) Under reducing conditions, those experienced on the anode side of the fuel cell, a large amount of oxygen vacancies within the ceria electrolyte can be formed. Some of the cerium(IV) oxide is also reduced to cerium(III) oxide under these conditions which consequently increases the electronic conductivity of the material. The lattice constant of ceria increases under reducing conditions as well as with decreasing nanocrystal size in nanocrystalline ceria, as a result of reduction of the cerium cation from a 4+ to a 3+ state in order to charge compensate for oxygen vacancy formation.
d) Ceria has been used in catalytic converters in automotive applications. Since ceria can become non-stoichioimetric in oxygen content (i.e. it can give up oxygen without decomposing) depending on its ambient partial pressure of oxygen, it can release or take in oxygen in the exhaust stream of a combustion engine. In association with other catalysts, ceria can effectively reduce NOx emissions as well as convert harmful carbon monoxide to the less harmful carbon dioxide. Ceria is particularly interesting for catalytic conversion economically because it has been shown that adding comparatively inexpensive ceria can allow for substantial reductions in the amount of platinum needed for complete oxidation of NOx and other harmful products of incomplete combustion.
e) Due to its fluorite structure, the oxygen atoms in a ceria crystal are all in a plane with one another, allowing for rapid diffusion as a function of the number of oxygen vacancies. As the number of vacancies increases, the ease at which oxygen can move around in the crystal increases, allowing the ceria to reduce and oxidize molecules or co-catalysts on its surface. It has been shown that the catalytic activity of ceria is directly related to the number of oxygen vacancies in the crystal, frequently measured by using X-Ray Photoelectron Spectroscopy to compare the ratios of Ce3+ to Ce4+ in the crystal.
f) Ceria can also be used as a co-catalyst in a number of reactions, including the water-gas shift and steam reforming of ethanol or diesel fuel into hydrogen gas and carbon dioxide (with varying combinations of rhodium oxide, iron oxide, cobalt oxide, nickel oxide, platinum, and gold), the Fischer-Tropsch reaction, and selected oxidation (particularly with lanthanum). In each case, it has been shown that increasing the ceria oxygen defect concentration will result in increased catalytic activity, making it very interesting as a nanocrystalline co-catalyst due to the heightened number of oxygen defects as crystallite size decreases—at very small sizes, as many as 10% of the oxygen sites in the fluorite structure crystallites will be vacancies, resulting in exceptionally high diffusion rates. Source: Wikipedia
Cerium Oxide Packaging:
a) Jars, pails, drums, multiply paper bags, bulk bags and fiberboard containers. For further information on packaging options contact us.
b) Packaging may vary according to HAZMAT and TSCA (SARA Title III) status.
Packaging Details: Cerium Oxide Powder packed into plastic film bags and then packed into steel drums or packed to customers' specifications
For small amount or samples, we can prepare and package the commodities with Aluminum foil bags, vacuumed and sealed. And send it to you using FedEx, DHL or UPS, door to door transportation.
ISO/TS 16949 QMS certificates demonstrates both commitment to product quality and compliance to customer specific requirements. The system is an ongoing process that helps find and report areas of improvement.