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A kind of m-mno x - CEO 2 Catalysts and their applications

A technology of catalysts and dopants, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., which can solve the preparation cost of rare industrial applications and limited scale applications Catalyst stability and other issues, to achieve the effect of good thermal stability, large specific surface area, high catalytic oxidation activity

Active Publication Date: 2021-11-30
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing indoor formaldehyde treatment technology can be divided into two categories: one is physical adsorption technology, which mainly uses high-performance adsorption materials (granular activated carbon, zeolite, molecular sieve, etc.) ) absorption to achieve the purpose of purifying the air; one type is chemical oxidation technology, that is, formaldehyde is oxidized and degraded into non-toxic and harmless CO through chemical oxidation or biotechnology 2 and H 2 O, which includes ozone oxidation, photocatalytic oxidation, room temperature catalytic oxidation and negative ion technology, among which room temperature catalytic oxidation can catalyze the complete oxidation of formaldehyde without using external light source and heat source, which is easy to integrate into air purifier or Ventilation and air-conditioning systems have a wide range of applications and are considered to be the development trend of air purification technology, with broad development space and application prospects. However, the room temperature catalytic oxidation technology is still in the experimental development stage, and the catalysts are mostly loaded noble metal catalysts. Its large-scale application is limited by the preparation cost and the stability of the catalyst, and there are few examples of industrial application

Method used

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  • A kind of m-mno <sub>x</sub> - CEO <sub>2</sub> Catalysts and their applications
  • A kind of m-mno <sub>x</sub> - CEO <sub>2</sub> Catalysts and their applications
  • A kind of m-mno <sub>x</sub> - CEO <sub>2</sub> Catalysts and their applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take an appropriate amount of manganese nitrate solution, add an appropriate amount of distilled water, then take an appropriate amount of solid cerium nitrate and dissolve it in the above solution, stir until completely dissolved, wherein the Mn / Ce molar ratio is 6:1, then add an appropriate amount of potassium carbonate, and stir until completely dissolved, its K 2 The load of O is 1wt%, and then add an appropriate amount of citric acid solid into the above solution, stir until it is completely dissolved, the molar ratio of metal ion to citric acid is 6:1, put the above solution in a water bath at 80°C for cooking, and make it into In the form of a sol, take it out and place it in a stainless steel reactor with a polytetrafluoroethylene liner, and place the reactor in an oven at 100°C for aging for 24 hours, then take out the sample and place it in an oven at 100°C for 5 hours to dry, then put The above-mentioned solid is ground into powder, and then roasted at 350°C ...

Embodiment 2

[0032] Take an appropriate amount of manganese nitrate solution, add an appropriate amount of distilled water, then take an appropriate amount of solid cerium nitrate and dissolve it in the above solution, stir until completely dissolved, wherein the Mn / Ce molar ratio is 4:1, then add an appropriate amount of ferric nitrate, and stir until completely dissolved, The molar ratio of Fe / Ce is 1:2, then add an appropriate amount of solid citric acid into the above solution, stir until it is completely dissolved, the molar ratio of metal ions to citric acid is 12:1, put the above solution in a water bath at 80°C for cooking, Make it into a sol, take it out and put it in a stainless steel reactor with a polytetrafluoroethylene liner, and put the reactor in an oven at 120°C for aging for 24 hours, then take out the sample and put it in an oven at 100°C for 5 hours to dry , and then grind the above solid into powder, and roast at 550°C for 7 hours to obtain powder FeO x -MnO x -CeO 2...

Embodiment 3

[0034] Take an appropriate amount of manganese nitrate solution, and add an appropriate amount of distilled water, then take an appropriate amount of solid cerium nitrate and dissolve it in the above solution, stir until it is completely dissolved, wherein the Mn / Ce molar ratio is 2:1, then add an appropriate amount of copper nitrate, and stir until completely dissolved, The molar ratio of Cu / Ce is 1:1, then add an appropriate amount of solid citric acid into the above solution, stir until it is completely dissolved, the molar ratio of metal ions to citric acid is 18:1, put the above solution in a water bath at 80°C for cooking , make it into a sol, take it out and put it in a stainless steel reactor with a polytetrafluoroethylene liner, and put the reactor in a 140°C oven for aging for 24h, then take out the sample and place it in an oven at 100°C for 5h Dry, then grind the above solid into powder, and roast at 650°C for 7h to obtain powder CuO-MnO x -CeO 2 catalyst.

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Abstract

The invention discloses a M‑MnO X -CeO 2 Catalyst, the catalyst is MnO X , CeO 2 It is the active component, with M as the dopant, prepared by citric acid complexation method; M is FeO x , CuO, CoO x or K 2 O; the molar ratio of Mn and Ce in the catalyst is 6:1‑1:1; when M is FeO x , CuO or CoO x , the molar ratio of metal ions to Ce in M ​​is 1:4‑1:1; when M is K 2 O, K 2 The doping amount of O is 1 wt%. The catalyst of the invention can be used for catalytic oxidation of gaseous formaldehyde under normal temperature conditions, or for thermal catalytic oxidation of CVOCs.

Description

technical field [0001] The invention relates to a powder type and supported M-MnO x -CeO 2 Catalyst and its preparation method and application. The powder-type catalyst is mainly used for catalyzing indoor gaseous formaldehyde at room temperature, which can catalyze and oxidize gaseous formaldehyde at room temperature to reduce indoor formaldehyde to the national standard ( 0.08 mg / m 3 ) below; supported catalysts are mainly used for thermocatalytic oxidation of CVOCs, such as chlorobenzene, dichlorobenzene, dichloroethane, dichloroethylene, etc. Background technique [0002] A large amount of volatile organic compounds (Volatile organic compounds, referred to as VOCs) will continue to be emitted in the production process of my country's petrochemical, packaging and printing, pharmaceutical, coating, automobile manufacturing and semiconductor manufacturing industries. A large number of studies have shown that VOCs are the cause of compound atmospheric pollution One of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J23/889B01D53/86B01D53/72B01D53/70
CPCB01D53/8662B01D53/8668B01D2255/2022B01D2255/2065B01D2255/2073B01D2255/20738B01D2255/20746B01D2255/20761B01D2257/2064B01D2257/708B01J23/34B01J23/8892
Inventor 黄琼陶涛司涵虞舒琨王佳晓赵云霞
Owner NANJING UNIV OF INFORMATION SCI & TECH
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