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Stable and efficient wet oxidation catalyst and preparation method thereof

A wet oxidation and catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as catalyst deactivation, achieve simple operation and improve utilization. Efficient, low cost effect

Inactive Publication Date: 2013-12-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalyst deactivation caused by the dissolution of transition metal oxide active components during the reaction and sintering during heat treatment has become an urgent problem to be solved in this system.

Method used

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  • Stable and efficient wet oxidation catalyst and preparation method thereof
  • Stable and efficient wet oxidation catalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026]Dissolve 8.46g of copper nitrate, 9.52g of zinc nitrate, 9.38g of aluminum nitrate, 3.23g of ferric nitrate and 0.15g of lanthanum nitrate in 100ml of water to prepare a mixed salt solution. Dissolve 11.20g of potassium hydroxide and 6.30g of sodium carbonate in 100ml of water to prepare alkali solution and carbonate solution. Add the mixed salt solution and potassium hydroxide solution slowly and dropwise to the vigorously stirred sodium carbonate solution at the same time, control the drop rate of the salt and alkali, and keep the pH value of the solution at 10±0.2. After the mixed salt solution is consumed, stop the dropwise addition. The precipitate was stirred and crystallized in a water bath at 60°C for 24 hours, the obtained slurry was filtered and washed until neutral, and the filter cake was dried overnight in an oven at 60°C. figure 1 In a, it can be seen that the obtained powder is hydrotalcite-like, and the precursor powder is placed in a muffle furnace at 2°...

Embodiment 2

[0030] Dissolve 9.38g of copper nitrate, 14.87g of zinc nitrate, 13.13g of aluminum nitrate, 5.05g of ferric nitrate and 1.08g of lanthanum nitrate in 150ml of water to prepare a mixed salt solution. Dissolve 16.20g of sodium hydroxide and 5.30g of sodium carbonate in 100ml of water to prepare alkali solution and carbonate solution. Slowly add the mixed salt solution and sodium hydroxide solution dropwise into the vigorously stirred sodium carbonate solution at the same time, control the drop rate of salt and alkali, and keep the pH value of the solution at 10±0.2. After the mixed salt solution is consumed, stop the dropwise addition. The precipitate was stirred and crystallized in a water bath at 60°C for 48 hours, the obtained slurry was filtered and washed until neutral, and the filter cake was dried overnight in an oven at 60°C. figure 2 It can be seen in a that the obtained powder is hydrotalcite-like, and the precursor powder is placed in a muffle furnace at 5°C·min -1...

Embodiment 3

[0033] Dissolve 6.25g of copper nitrate, 6.11g of zinc acetate, 7.99g of aluminum sulfate, 2.00g of ferric sulfate and 2.17g of lanthanum nitrate in 100ml of water to prepare a mixed salt solution. Prepare 100ml of 7.0% dilute ammonia water, and dissolve 4.80g of ammonium carbonate in 100ml of water to prepare alkali solution and carbonate solution. Add the mixed salt solution and dilute ammonia water slowly and dropwise to the vigorously stirred ammonium carbonate solution at the same time, control the drop rate of salt and alkali, and keep the pH value of the solution at 10±0.2. Stir and crystallize the material in a water bath at 60°C for 20 hours, filter and wash the obtained slurry to neutrality, and dry the filter cake in an oven at 80°C overnight, then place the precursor powder in a muffle furnace at 10°C min -1 The heating rate was raised from room temperature to 650°C and roasted for 2 hours to obtain the roasted product, which was filtered and washed with 0.5 mol / ...

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Abstract

The invention discloses a stable and efficient wet oxidation catalyst and a preparation method thereof, belonging to the technical field of water treatment and material preparation. The preparation method of the catalyst comprises the following steps: dropping a mixed salt solution containing copper, zinc, aluminum, iron and lanthanum and a sodium hydroxide solution into a sodium carbonate solution together, and then crystallizing, filtering, washing, drying and roasting to obtain a composite oxide catalyst, wherein a precursor of the catalyst has characteristics of layered hydrotalcite. The catalyst shows an efficient and stable catalytic effect on wet catalytic oxidation of industrial wastewater and analog pollutant phenol. The preparation method improves the activity and stability of a copper-based catalyst and expands the application area of the copper-based catalyst, and the synthesized composite oxide catalyst has important application values and prospects in the field of treatment on high-concentration organic wastewater through wet catalytic oxidation.

Description

technical field [0001] The invention belongs to the technical field of water treatment and material preparation, and more specifically relates to a composite metal oxide catalyst used in wet catalytic oxidation treatment of high-concentration organic wastewater and a preparation method thereof. Background technique [0002] With the development of world population, industrialization, agriculture and urbanization, a large amount of refractory organic matter continuously enters the water body, which not only deteriorates the living environment of human beings, hinders the development of related industries, but also makes the quantity and quality of the world's available fresh water resources continue to decline. . Wastewater treatment has become an important social, technical, economic and political issue. The removal of pollutants in water has also become an important research field. The chemical and petroleum industries generate a wide variety of highly toxic organic waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C02F1/72C02F101/34C02F101/38
Inventor 张立红李海洲
Owner TIANJIN UNIV
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