Several Major Uses of Nanometer Cerium Oxide

Nanocerium oxide is a cheap and widely used rare earth oxide. Nanocerium oxide has a small particle size, uniform particle size distribution, and high purity. Insoluble in water and alkali, slightly soluble in acid. It can be used as polishing materials, catalysts, catalyst carriers (auxiliaries), automobile exhaust absorbers, ultraviolet absorbers, fuel cell electrolytes, electronic ceramics, etc. Nanoscale cerium oxide can directly affect the performance of materials. For example, adding ultrafine nanometer cerium oxide to ceramics can reduce the sintering temperature of ceramics, inhibit lattice growth, and improve the density of ceramics. A large specific surface area can better improve the catalytic activity of the catalyst. Its price-changing characteristics make it have good photoelectric properties and can be doped into other semiconductor materials for modification, improving the efficiency of light quantum migration and improving the photo-induced excitation of the material.

Used for UV absorption

According to research, ultraviolet light between 280nm and 320nm can cause skin tanning and sunburn and even cause skin cancer in severe cases. Adding nanoscale cerium oxide to cosmetics can reduce the damage of ultraviolet rays to the human body. Nanocerium oxide has a strong absorption effect on ultraviolet rays and can be used as an ultraviolet absorber in sunscreen cosmetics, automotive glass, sunscreen fibers, coatings, plastics, and other products. Cerium oxide is used in sunscreen cosmetics. It has no characteristic absorption of visible light, good permeability, and good UV protection effect; and amorphous silicon oxide coating on cerium oxide can reduce the catalytic activity of cerium oxide, thereby preventing The catalytic activity of cerium oxide causes discoloration and deterioration of cosmetics.

Used in catalysts

In recent years, with the improvement of people's living standards, cars have become more and more popular in people's lives. Currently, cars mainly burn gasoline. This inevitably produces harmful gases. At present, people have separated more than 100 substances from automobile exhaust, of which more than 80 are harmful substances announced by the Chinese environmental protection industry, mainly including carbon monoxide, hydrocarbons, nitrogen oxides, Particulate matter (PM), etc. In automobile exhaust, except for nitrogen, oxygen, and combustion products carbon dioxide and water vapor, which are harmless components, the rest are harmful components. Therefore, controlling and solving vehicle exhaust pollution has become an urgent problem.

Regarding automobile exhaust catalysts, most of the common metals used in the early days were chromium, copper, and nickel. Their disadvantages were high ignition temperature, easy poisoning, and poor catalytic activity. After that, precious metals platinum, rhodium, palladium, etc. are used as catalysts, which have the advantages of long life, high activity, and good purification effect. However, because precious metals are expensive and costly, they are also easily poisoned by phosphorus, sulfur, lead, etc., so it is very difficult to promote.

Adding nano-cerium oxide to automobile exhaust purifiers has the following advantages over adding non-nano-scale cerium oxide: nano-scale cerium oxide particles have a large specific surface area, high coating volume, low harmful impurity content, and increased oxygen storage capacity; nano-oxidation Cerium is at the nanometer level, ensuring a high specific surface area of the catalyst in a high-temperature atmosphere, thereby greatly improving the catalytic activity; as an additive, it can reduce the amount of platinum and rhodium, automatically adjust the air-fuel ratio and promote catalysis, and can increase the heat of the carrier properties such as stability and mechanical strength.

Used in the steel industry

Due to their special atomic structure and activity, rare earth elements are used as trace additives in steel, cast iron, aluminum, nickel, tungsten, and other materials. They can eliminate impurities, refine grains, and improve material composition, thereby improving the mechanical, physical, and mechanical properties of the alloy. processing performance, improve the thermal stability and corrosion resistance of the alloy. For example, in the steel industry, rare earths are used as additives to purify molten steel, change the shape and distribution of impurities in the center of the steel, refine the grains, and change the structure and properties. Using nano-cerium oxide as coatings and additives can improve the oxidation resistance, hot corrosion, water corrosion, and sulfurization properties of high-temperature alloys and stainless steel, and can also be used as an inoculant for ductile iron.

Nano-cerium oxide also has many uses. For example, in fuel cells, cerium oxide-based composite oxide is used as the electrolyte, which can have a sufficiently high oxygen ionization current density at 500°C to 800°C; cerium oxide is added during the rubber vulcanization process. It can modify rubber to a certain extent; in fields such as luminescent materials and magnetic materials, cerium oxide also plays an important role.

Xiamen Yuyi New Technology Co., Ltd. uses a one-time molding method to obtain the preparation technology for stable mass production of rare earth metals, which is a good solution to the low purity, low activity, and low product quality of other production processes (such as liquid phase method, grinding method, etc.) Issues such as uniformity and large particle size. Through a large number of experiments, Xiamen Yuyi New Technology Co., Ltd. has very rich and sophisticated experience in accurately preparing nano-rare earth metals of different types, high purity, and the same particle size distribution, and it is uniform and controllable in the range of 10-50 nanometers.