Monatomic catalyst for thermal desorption of soil polluted by organic matter and preparation method of monatomic catalyst

A technology of polluted soil and catalyst, which is applied in the direction of catalyst activation/preparation, restoration of polluted soil, physical/chemical process catalyst, etc., to achieve the effects of environmental friendliness, reduction of industrial thermal desorption cost, and improvement of activity and stability

Pending Publication Date: 2022-01-04
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a catalyst for the thermal desorption of organic matter polluted soil aiming at the present situation and existing problems of the existing soil thermal desorption. Another purpose of the present invention is to provide the preparation method of the above-mentioned catalyst

Method used

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  • Monatomic catalyst for thermal desorption of soil polluted by organic matter and preparation method of monatomic catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of carrier

[0029] Immerse 100g of alumina balls with a diameter of 2mm in 100g of triethanolamine, react for 20h under the condition of stirring in a water bath at 50°C, and then place them in an oven at 80°C for 2h to dry;

[0030] (2) Preparation of active component precursor solution

[0031] Weigh 63.1mg of cerium nitrate hexahydrate, 24.3mg of manganese sulfate monohydrate and 63.2mg of ferric nitrate nonahydrate, add 15.06g of deionized water and place in a constant temperature water bath at 60°C and stir for 60min until the solution is clear and transparent to obtain the active component precursor Body solution; wherein, the mass ratio of ceria, manganese dioxide and ferric oxide in the active component is 1:0.5:0.5;

[0032] (3) Preparation of catalyst

[0033] Based on the mass of the carrier, the active component accounts for 0.05% by mass of the carrier mass, weigh the 100g alumina balls prepared in step (1) and immerse them in the active ...

Embodiment 2

[0037] (1) Preparation of carrier

[0038] Immerse 100g of alumina balls with a diameter of 0.5mm in 300g of triethanolamine, react for 24 hours under the condition of stirring in a water bath at 60°C, and then place them in an oven at 110°C for 8 hours to dry;

[0039] (2) Preparation of active component precursor solution

[0040] Weigh 238.7mg of cerium chloride, 37.9mg of manganese chloride tetrahydrate and 56.4mg of ferric chloride hexahydrate, add 16.65g of deionized water and place in a constant temperature water bath at 60°C and stir for 120min until the solution is clear and transparent to obtain the active component Precursor solution; wherein, the mass ratio of ceria, manganese dioxide and ferric oxide in the active component is 1:0.1:0.1;

[0041] (3) Preparation of catalyst

[0042] Taking the mass of the carrier as a benchmark, the mass percentage of the active component accounting for the mass of the carrier is 0.2%, and the 100g alumina balls prepared in step...

Embodiment 3

[0046] (1) Preparation of carrier

[0047] Immerse 100g of alumina balls with a diameter of 1mm in 500g of triethanolamine, react in a water bath at 70°C for 24h, then place them in an oven at 110°C for 4h to dry;

[0048] (2) Preparation of active component precursor solution

[0049]Weigh 157.7mg of cerium nitrate hexahydrate, 71.1mg of manganese chloride tetrahydrate and 21.2mg of ferric chloride hexahydrate, add 12.5g of deionized water, place in a constant temperature water bath at 60°C and stir for 60min until the solution is clear and transparent to obtain the active group Sub-precursor solution; wherein, the mass ratio of ceria, manganese dioxide and ferric oxide in the active component is 1:0.5:0.1;

[0050] (3) Preparation of catalyst

[0051] Taking the mass of the carrier as a benchmark, the mass percentage of the active component accounting for the mass of the carrier is 0.1%, and the 100g alumina balls prepared in step (1) are weighed and immersed in the active...

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Abstract

The invention discloses a monatomic catalyst for thermal desorption of soil polluted by organic matter and a preparation method of the monatomic catalyst. An alumina ball is used as a carrier, a cerium-manganese-iron composite oxide is used as a catalytic active component, and triethanolamine is used as an anchoring agent. The carrier mass is taken as a reference. The preparation method comprises the following steps: impregnating alumina balls in an anchoring agent, conducting drying after a water bath reaction, impregnating the alumina balls in an active component precursor composite solution, and conducting reacting, aging, drying and roasting. The catalyst is environment-friendly and high in mechanical strength, 100% desorption of benzo[A]anthracene can be achieved at the temperature of 200 DEG C, and thermal desorption energy consumption of benzo[A]anthracene is greatly reduced. The product can be widely applied to the field of thermal desorption of soil organic pollutants.

Description

technical field [0001] The invention relates to a single-atom catalyst for thermal desorption of organic polluted soil and a preparation method thereof, belonging to the field of environmental protection catalytic materials and soil restoration. Background technique [0002] Research on various remediation technologies and equipment for organically polluted sites has been widely carried out in recent years, and relevant research results have also been applied to the remediation of contaminated sites. Thermal desorption remediation technology is widely used in the treatment of soil, sludge, sediment and other sites containing volatile and semi-volatile organic pollutants due to its advantages of high treatment efficiency, short remediation period, and wide application range. Pollutants that can be treated by thermal desorption include nitrobenzene, polybrominated diphenyl ethers, chlorobenzene, mercury, polychlorinated biphenyls, and polycyclic aromatic hydrocarbons. However...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J23/94B01J35/00B01J37/00B01J37/02B09C1/06C09K17/08
CPCB01J23/002B01J23/8892B01J23/94B01J37/0018B01J37/0207B09C1/06B09C1/065C09K17/08B01J2523/00B01J35/394B01J2523/31B01J2523/3712B01J2523/72B01J2523/842Y02P20/584
Inventor 徐海涛金奇杰徐慕涛计雯钰陆尧李明波宋静徐梦
Owner NANJING UNIV OF TECH
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