A kind of wet oxidation catalyst and its preparation method and application

A wet oxidation and catalyst technology, used in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. The effect of improving catalytic activity, reducing production cost and reducing operating temperature

Active Publication Date: 2022-02-15
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Catalytic wet oxidant technology can more effectively remove formaldehyde in wastewater, but the existing more effective catalysts contain high precious metals, and the removal rate of formaldehyde still needs to be further improved

Method used

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  • A kind of wet oxidation catalyst and its preparation method and application
  • A kind of wet oxidation catalyst and its preparation method and application
  • A kind of wet oxidation catalyst and its preparation method and application

Examples

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preparation example Construction

[0031] The present invention provides a method for preparing a wet oxidation catalyst described in the above scheme, comprising the following steps: mixing a divalent nickel salt, a ferric salt, a precipitating agent and water to obtain a mixed solution;

[0032] adjusting the pH value of the mixed solution to 8-10, performing a hydrothermal reaction on the mixed solution after the adjusted pH value, and sequentially drying and calcining the solid product obtained by the hydrothermal reaction to obtain a nickel-iron hydrotalcite carrier;

[0033] Mixing the nickel-iron hydrotalcite carrier, the Pt precursor and water to obtain a mixed material liquid; the mass of Pt in the Pt precursor is 0.001% to 1% of the mass of the nickel-iron hydrotalcite carrier;

[0034] Mixing the mixture liquid with a reducing agent aqueous solution to carry out a reduction reaction, separating solids and liquids from the reduction reaction product, drying the solid product, and roasting the obtained ...

Embodiment 1

[0070] (1) 2.44gNi(NO 3 ) 2 ·6H 2 O, 1.13gFe(NO 3 ) 3 9H 2 O was dissolved in 30 mL deionized water;

[0071] (2) 1.26g of urea was dissolved in 30mL of deionized water, mixed with the solution in (1), and stirred evenly to obtain a mixed solution;

[0072] (3) adding dropwise sodium hydroxide solution to the above mixed solution to adjust the pH value of the solution to 8.5;

[0073] (4) The mixed solution after adjusting the pH value is placed in a hydrothermal reaction kettle, the reaction temperature is 50°C, and the reaction time is 19h;

[0074] (5) After hydroheating, the obtained product is suction filtered, washed, dried, and placed in a muffle furnace for calcination at 400° C. for 6 hours to obtain a nickel-iron hydrotalcite carrier, which is denoted as LDHs (hyd);

[0075] (6) Disperse 1 g of LDHs (hyd) in 75 mL of water, add 6.65 μL of chloroplatinic acid hexahydrate solution under stirring conditions, and soak for 30 minutes, wherein the concentration of c...

Embodiment 2

[0080] The only difference from Example 1 is that the addition amount of chloroplatinic acid hexahydrate solution is adjusted to 2.66 μL, and the obtained catalyst is recorded as 0.001Pt / LDHs(hyd).

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Abstract

The invention provides a wet oxidation catalyst and its preparation method and application, belonging to the technical field of catalysts. The wet oxidation catalyst of the invention uses nickel-iron hydrotalcite as a carrier and noble metal Pt as an active component; the noble metal Pt is in an electron-rich state; the mass of the active component is 0.001-1% of the mass of the carrier. In the catalyst provided by the present invention, Pt is in an electron-rich state, which is beneficial to the activation and transfer of oxygen. Therefore, Pt can promote the oxidation of formaldehyde when the amount of Pt is extremely low, thereby improving the catalytic activity of the catalyst and reducing the working temperature of the catalyst. It not only reduces the production cost of the catalyst, but also reduces the cost of removing formaldehyde due to the low working temperature. The results of the examples show that the wet oxidation catalyst of the present invention has a removal rate of formaldehyde up to 100% and a TOC removal rate of over 93% at room temperature.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a wet oxidation catalyst and its preparation method and application. Background technique [0002] Formaldehyde is a chemical raw material with a wide range of uses, but a large amount of waste water containing formaldehyde will be produced in the process of its production and utilization. The existence of formaldehyde not only destroys the ecological environment of water bodies, but also endangers human health. [0003] At present, the technologies for processing formaldehyde wastewater mainly include: 1. Physical methods, such as high-temperature combustion, adsorption, lime and ion exchange; 2. Biological methods, such as anaerobic and aerobic methods; 3. Chemical methods, such as Fenton reagent oxidation method, photocatalytic method and catalytic wet oxidation method, etc. Generally speaking, the physical method not only has a low removal rate, but also has defects such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C02F1/72C02F101/34
CPCB01J23/892B01J23/007C02F1/725C02F1/727C02F2209/20C02F2101/34
Inventor 陈秉辉刘宁张诺伟蔡凡叶松寿谢建榕郑进保
Owner XIAMEN UNIV
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