FIELD: manufacturing technology.
SUBSTANCE: present invention relates to particles of cerium oxide, which have excellent heat resistance, in particular, suitable for catalysts, functional ceramics, solid electrolyte for fuel cells, material for grinding, ultraviolet absorbers, and the like, and especially suitable for use as catalyst or cocatalyst material, for example, in catalysis for cleaning exhaust gases of vehicles. Present invention also relates to a method of producing such particles of cerium oxide, and to a catalyst, for example, for cleaning exhaust gases using such particles of cerium oxide. Method of producing cerium oxide particles includes at least steps for preparing a solution of a cerium salt containing anions and cations, where ranges from 90 to 100 mol%. cerium cations are tetravalent cerium cations. Method also includes heating solution of cerium salt at temperature within range from 60 to 220 °C, to obtain a suspension containing a liquid medium and a precipitate, and reducing the concentration of anions of the cerium salt present in the liquid medium by a value in range of 10 to 90 mol% compared to said anions contained in the liquid medium. Additionally, the method involves heating the suspension at a temperature in range of 100 to 300 °C, optionally cooling the suspension, bringing the suspension into contact with the main compound, optionally separating the precipitate from the liquid medium. Method also includes adding an organic texturing agent to a slurry or to a slurry, optionally separating the residue from the liquid and calcining a precipitate obtained at the end of the step of adding an organic texturing agent or obtained at the step of producing particles of cerium oxide. Particles of cerium oxide have the following properties: specific surface area (SBET), enclosed within 80 to 120 m2/g, after calcination at 800 °C for 2 hours in air; specific surface area (SBET), enclosed within range from 55 to 80 m2/g, after calcination at 900 °C for 5 hours in air; total volume of pores enclosed within range from 0.9 to 1.6 ml/g, after calcination at 800 °C for 2 hours in air; and total volume of pores enclosed within range from 0.85 to 1.5 ml/g after calcination at 900 °C for 5 hours in air. Catalyst is a cocatalyst containing cerium oxide particles for cleaning exhaust gases. Composition contains at least cerium oxide particles obtained using the cerium oxide method or particles. Method for removing part of a substrate includes preparing at least a composition comprising particles of cerium oxide obtained using a method of producing particles of cerium oxide, or particles of cerium oxide, available for production by means of a method of producing particles of cerium oxide, contacting at least a composition and a substrate to be ground, and performing grinding of the substrate.
EFFECT: high heat resistance, absorption and desorption capacity.
16 cl, 2 tbl, 2 ex
