Preparation method of cerium oxide with large specific surface area

A large specific surface, cerium oxide technology, applied in chemical instruments and methods, rare earth metal oxide/hydroxide, metal/metal oxide/metal hydroxide catalyst, etc., can solve the reduction of specific surface area and affect the catalytic effect. and other problems, to achieve the effect of low cost, good catalytic effect and good environmental protection

Active Publication Date: 2018-06-19
蒋央芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally, cerium oxide with large specific surface is used for high temperature catalysis, and high temperature can mak

Method used

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  • Preparation method of cerium oxide with large specific surface area
  • Preparation method of cerium oxide with large specific surface area
  • Preparation method of cerium oxide with large specific surface area

Examples

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Embodiment 1

[0031] A method for preparing cerium oxide with a large specific surface, comprising the following steps:

[0032] (1) Dosing, industrial pure ceric sulfate is mixed with the ceric sulfate solution that concentration is 181g / L, and constant temperature is 41 ℃ to temperature, and industrial pure ammonium carbonate is mixed with the ammonium carbonate solution that concentration is 585g / L, And keep the temperature at 41°C, prepare industrial pure oxalic acid into an oxalic acid solution with a concentration of 103g / L, and keep the temperature at 41°C;

[0033] (2) Reaction, put the prepared oxalic acid solution into the reaction kettle, and keep the temperature until the temperature is 40°C. The reaction kettle has a built-in cooling coil, and then stir at a stirring speed of 110r / min. Add 0.11 times the volume of the oxalic acid solution Ammonium solution, continue to stir for 20 minutes after adding, as the bottom liquid, then add ceric sulfate solution and ammonium carbonate...

Embodiment 2

[0042] A method for preparing cerium oxide with a large specific surface, comprising the following steps:

[0043] (1) dosing, the industrial pure ceric sulfate is mixed with the ceric sulfate solution that concentration is 182g / L, and constant temperature is 40 ℃ to temperature, and industrial pure ammonium carbonate is mixed with the ammonium carbonate solution that concentration is 585g / L, And keep the temperature until the temperature is 40°C, prepare industrial pure oxalic acid into an oxalic acid solution with a concentration of 103g / L, and keep the temperature until the temperature is 40°C;

[0044] (2) Reaction, put the prepared oxalic acid solution into the reaction kettle, and keep the temperature until the temperature is 41°C, the reaction kettle has a built-in cooling coil, then stir, the stirring speed is 108r / min, add 0.105 times the volume of carbonic acid solution of the oxalic acid solution Ammonium solution, continue to stir for 23 minutes after adding, as th...

Embodiment 3

[0053] A method for preparing cerium oxide with a large specific surface, comprising the following steps:

[0054] (1) dosing, industrial pure ceric sulfate is mixed with the ceric sulfate solution that concentration is 184g / L, and constant temperature is 40.5 ℃ to temperature, and industrial pure ammonium carbonate is mixed with the ammonium carbonate solution that concentration is 585g / L, And keep the temperature until the temperature is 40°C, prepare industrial pure oxalic acid into an oxalic acid solution with a concentration of 101g / L, and keep the temperature until the temperature is 40°C;

[0055] (2) Reaction, put the prepared oxalic acid solution into the reaction kettle, and keep the temperature until the temperature is 41°C, the reaction kettle has a built-in cooling coil, and then stir at a stirring speed of 115r / min, add 0.115 times the volume of carbonic acid of the oxalic acid solution Ammonium solution, continue to stir for 25 minutes after adding, as the botto...

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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 ...

Claims

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Application Information

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IPC IPC(8): C01F17/00B01J35/10B01J23/10
CPCB01J23/10B01J35/10B01J35/1014B01J35/1019C01F17/206C01P2004/61C01P2004/62C01P2006/12C01P2006/80
Inventor 蒋央芳
Owner 蒋央芳
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