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Rare earth composite oxide catalyst in catalytic wet oxidation process and preparing method thereof

A technology that catalyzes wet oxidation and composite oxides. It is applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., and can solve the problems of decreased catalyst activity, high catalyst cost, small The problem of low removal rate of molecular organic acids can be achieved by reducing the operating temperature and pressure, making the production process simple and easy, and promoting the promotion and application.

Inactive Publication Date: 2005-09-21
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Noble metal series catalysts have high catalytic activity and stability, especially for small molecule organic acids that are difficult to degrade, but the high price of noble metals themselves leads to high catalyst costs
[0005] Although metal copper series catalysts have good catalytic activity, there is a serious dissolution phenomenon of catalyst active components in the reaction, which reduces the catalyst activity and causes secondary pollution problems
[0006] Rare earth series catalysts mainly use metal zirconium and cerium, which are relatively low in price, have certain activity and good stability in wet oxidation, but the removal rate of rare earth metals for small molecule organic acids is relatively low

Method used

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  • Rare earth composite oxide catalyst in catalytic wet oxidation process and preparing method thereof
  • Rare earth composite oxide catalyst in catalytic wet oxidation process and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Prepare 0.1mol / L ZrOCl 2 ·8H 2 O and 0.9mol / L Ce(NO 3 ) 3 ·6H 2 O Mix 50ml of solution and 1000ml of 0.5mol / L ammonia water, slowly drop the salt solution into the vigorously stirred ammonia water, filter the obtained gel precipitate, and redisperse it in 400ml of deionized water, adjust the pH value to 10 , refluxed in hot lye for 24h, then dried in an oven at 100°C, then placed in a muffle furnace, and calcined at 400°C for 6h in an air atmosphere to obtain ZrO 2 -CeO 2 composite oxide catalyst.

[0024] Then utilize the catalyst prepared by the above method to catalyze wet oxidation containing high-concentration acetic acid wastewater:

[0025] Prepare an acetic acid solution with a COD concentration of about 5000 mg / L, and add ZrO 2 -CeO 2 Put 2.7g of catalyst in the reactor and heat it up to 230°C, stop heating, feed oxygen until the total pressure is 5MPa, continue heating when the temperature drops to 230°C and keep the temperature at 230±3°C, the reactio...

Embodiment 2

[0027] Prepare 0.1mol / L ZrOCl 2 ·8H 2 O and 0.9mol / L Ce(NO 3 ) 3 ·6H 2 O mixed solution 50ml and 0.5mol / L ammonia water 1000ml, slowly drop the salt solution into the vigorously stirred ammonia water, filter the obtained gel precipitate, and redisperse it in 400ml deionized water, adjust the pH value to 10, Reflux in hot lye for 24h, then dry in an oven at 100°C, then place in a muffle furnace and bake at 400°C for 6h in an air atmosphere to obtain ZrO 2 -CeO 2 composite oxide catalyst.

[0028] Then use the catalyst catalytic wet oxidation prepared by the above method to contain high-concentration n-butyric acid wastewater:

[0029] Prepare n-butyric acid solution with COD concentration of about 9000mg / L, add ZrO 2 -CeO 2 Put 2.0g of catalyst in the reactor and heat it up to 230°C, stop heating, feed oxygen until the total pressure is 5MPa, continue heating when the temperature drops to 230°C and keep the temperature at 230±3°C, the reaction time is 2h, the result is ...

Embodiment 3

[0031] Prepare 0.1mol / L ZrOCl 2 ·8H 2 O and 1.1mol / L Ce(NO 3 ) 3 ·6H 2 O mixed solution 50ml and 0.5mol / L ammonia water 1000ml, slowly drop the salt solution into the vigorously stirred ammonia water, filter the obtained gel precipitate, and redisperse it in 400ml deionized water, adjust the pH value to 11, Reflux in hot lye for 36 hours, then dry in an oven at 80°C, then place in a muffle furnace and bake at 600°C for 8 hours in an air atmosphere to obtain ZrO 2 -CeO 2 composite oxide catalyst.

[0032]Then with the catalyst prepared by the above method, carry out the test of removing acetic acid effect according to the test method in embodiment one, the result shows that can obtain better removal effect, carry out the test of removing n-butyric acid effect according to the test method in embodiment two, It can also achieve better removal effect.

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Abstract

The invention discloses a method for preparing the rare-earth compound oxide catalyst, wherein the component is the composite oxides of ZrO2 and CeO2, and the molar ratio of the Zr and Ce is 1:1~1:11. The preparing method comprises the following steps: a) formulating the mixed solution of zircon salt and cerium salt, b) dropping the solution slowly to the alkaline solution which has been stirred vigorously, getting the gelatin deposit and filtering, c) dispersing the deposit again into the deionized water, adjusting the PH to alkalinity, refluxing in the hot alkali liquor, drying and baking and getting the catalyst.

Description

technical field [0001] The invention is used for treating waste water containing high-concentration refractory small molecular organic acids in a catalytic wet oxidation process, and belongs to the field of water treatment technology and environmental functional materials. Background technique [0002] Wet oxidation technology is a very effective advanced chemical oxidation water treatment technology, especially suitable for the treatment of toxic, harmful and high-concentration organic wastewater. Wet oxidation technology has attracted extensive attention due to its advantages of high treatment efficiency, low secondary pollution, fast oxidation speed, small equipment size and recoverable energy, and has a good application prospect. However, wet oxidation technology needs to operate under higher temperature and pressure. Scientists and technicians overcome these shortcomings by adding catalysts to the reaction system and using catalytic wet oxidation technology. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10C02F1/72
Inventor 祝万鹏王建兵杨少霞陈正雄
Owner TSINGHUA UNIV
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