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Wet oxidation catalyst and preparation method thereof

A catalyst and oxidant technology, applied in the field of catalytic wet oxidation catalyst and its preparation, can solve the problems of high working temperature, high price, gap in activity, etc., and achieve the effects of high anti-bleeding performance, stable catalytic performance, and good low-temperature activity.

Active Publication Date: 2017-06-09
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heterogeneous catalysts can be divided into noble metal and transition metal catalysts. Noble metal catalysts have good catalytic activity, but are expensive and have limited reserves.
While transition metal catalysts have better economics, but their activity is still far from industrial applications
Although noble metal catalysts have greater catalytic activity, their operating temperatures are usually greater than 150 °C, while transition metal catalysts require higher temperatures

Method used

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  • Wet oxidation catalyst and preparation method thereof
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preparation example Construction

[0026] The invention provides a kind of preparation method of catalyst, comprises the following steps:

[0027] 1) Dissolving the manganese precursor salt in water to obtain a manganese salt solution, adjusting the pH value of the manganese salt solution to 8-10 with an alkaline solution to obtain an alkaline manganese salt solution;

[0028] 2) mixing the alkaline manganese salt solution with an oxidizing agent to perform an oxidation reaction to obtain a primary oxidation product;

[0029] 3) mixing the primary oxidation product with a peroxidant to carry out a hydrothermal reaction, and separating the obtained reaction product from solid to liquid to obtain a solid;

[0030] 4) drying and calcining the obtained solid in an oxygen atmosphere to obtain a catalyst.

[0031] This method combines redox and hydrothermal. Precipitation of manganese precursor from alkaline solution to generate Mn(OH) 2 precipitation. After high temperature water heating, Mn(OH) 2 decomposes in...

Embodiment 1

[0043] MnCl 2Dissolve in water, prepare a solution with a concentration of 0.3mol / L, take 500mL of the solution, and add dropwise 0.2mol / L sodium hydroxide solution to adjust the pH value to 9, then add 7.51g of 20% hydrogen peroxide, and then mix the resulting mixture Put it in a constant temperature water bath at 80°C, and after the oxidation reaction for 3 hours, transfer the mixed solution into a high-pressure reactor, rapidly raise the temperature to 150°C, and continue the reaction for 6 hours, during which time, 2.15g of 20% hydrogen peroxide was added every half hour. Then, the obtained mixture was filtered and washed, and the obtained solid was dried at 80° C., and finally calcined at 450° C. in an oxygen atmosphere to obtain a catalyst.

[0044] Add 0.1g catalyst to 20mL phenol wastewater (TOC=1000ppm), reaction pressure=2.0Mpa, reaction temperature 60°C, 70°C, 80°C, 90°C, react in autoclave for 3h, the results are shown in Table 1.

[0045] Catalyst activity at dif...

Embodiment 2

[0048] MnCl 2 Dissolve in water, prepare a solution with a concentration of 0.5mol / L, take 500mL of the solution, and add dropwise 0.2mol / L sodium hydroxide solution to adjust the pH value to 10, then add 7.79g of 30% hydrogen peroxide, and then mix the resulting mixture Put it in a constant temperature water bath at 100°C, and after the oxidation reaction for 4 hours, transfer the mixed solution into a high-pressure reactor, rapidly raise the temperature to 180°C, and continue the reaction for 8 hours, during which time, 2.23g of 30% hydrogen peroxide was added every half hour. Then, the obtained mixture was filtered and washed, the obtained solid was dried at 100° C., and finally calcined at 600° C. in an oxygen atmosphere for 8 hours to obtain a catalyst.

[0049] Add 0.1g catalyst to 20mL phenol wastewater (TOC=1000ppm), reaction temperature=70°C, reaction pressure 1.5MPa, 2.5MPa, 3.0MPa in the autoclave for 3h, the results are shown in Table 2.

[0050] The activity of c...

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Abstract

The invention provides a wet oxidation catalyst and a preparation method thereof. The preparation method for the wet oxidation catalyst comprises the steps of mixing precursor manganese salt and water; dripping an alkaline solution to an obtained mixture to adjust the pH value to an alkaline value; dripping oxidizing agents such as hydrogen peroxide and so on to the mixture to carry out oxidation reaction on the mixture; after mixing the oxidized manganese salt solution and hydrogen peroxide, carrying out hydrothermal reaction on the mixed manganese salt solution and hydrogen peroxide; filtering an obtained reactant to obtain a solid; drying and roasting the obtained solid in the oxygen atmosphere to obtain the catalyst. The wet oxidation catalyst provided by the invention has the advantages of low price, good low temperature activity and stability and good loss resistance.

Description

technical field [0001] The present application relates to the field of sewage treatment catalysts, in particular to a catalytic wet oxidation catalyst and a preparation method thereof. Background technique [0002] With the rapid development of modern industry and agriculture, a large number of refractory, even toxic and harmful organic substances continue to enter the water body. Water body pollution has seriously affected the further development of human society. The harmless treatment technology of wastewater has become the most concerned in the world today. one of the research fields. Catalytic wet oxidation technology is a new type of wastewater treatment technology, which refers to using oxygen-enriched gas or oxygen as the oxidant at high temperature (200-280°C) and high pressure (2-8MPa), using the catalytic effect of the catalyst to accelerate the reaction between organic matter and oxidant in wastewater. Respiratory reaction to oxidize organic matter and toxic sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34C01G45/02C02F1/72C02F1/76C02F101/34
CPCB01J23/34C01G45/02C02F1/722C02F1/725C02F1/76C02F2101/345
Inventor 陈秉辉温瑶瑶马长健张诺伟郑进保
Owner XIAMEN UNIV
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