Preparation method of cerium oxide with large specific surface area

Abstract

The invention discloses a preparation method of cerium oxide with large specific surface area. The preparation method comprises the following steps: preparing liquid: preparing ceric sulfate, ammoniumcarbonate and oxalic acid into a solution and putting the prepared oxalic acid solution into a reaction still, adding an ammonium carbonate solution the volume of which is 0.1 to 0.12 time that of the oxalic acid solution; then adding a ceric sulfate solution and the ammonium carbonate solution into a base solution and cooling the temperature at constant speed in the reaction still; after material adding is finished, stopping cooling the temperature of the reaction still; keeping the temperature and carrying out stirring reaction for 1 to 1.5 hours; then carrying out solid-liquid separation to obtain first filtrate and first residues; adding the first residues into pure water for washing; then drying, crushing and sieving to obtain a sieved material; calcining the sieved material in a rotary kiln, and crushing and screening to obtain the cerium oxide with the large specific surface area. The preparation method of the cerium oxide with the large specific surface area, disclosed by theinvention, has the advantages of simple preparation process, larger specific surface area at normal temperature and high temperature and high catalytic activity.

Description

technical field [0001] The invention relates to a method for preparing cerium oxide with a large specific surface area, belonging to the technical field of catalysts. Background technique [0002] Cerium oxide with a large specific surface is used in petroleum cracking and cracking, automobile exhaust purification and catalysis and other fields. The conventional process is prepared by co-precipitation method. By controlling the agglomeration and adding stabilizers during the powder preparation process, the product can still maintain a large specific surface area at high temperature. The purity of cerium oxide with large specific surface on the market is greater than 99.9%, the particle size is 1-3 microns, the fresh specific surface is generally less than 160m2 / g, and the aged specific surface area (1000°C 4hr) is less than 25m2 / g. [0003] Generally, cerium oxide with large specific surface is used for high temperature catalysis, and high temperature can make the specific ...

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Problems solved by technology

[0003] Generally, cerium oxide with large specific surface is used for high temperature catalysis, and high temperature can make the specific surface of conventional large specific surface cerium oxide decrease sharply, thus affecting the catalytic effect

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