CN114602525A - Thermal desorption catalyst for aluminum nitride-based ceramic organic matter contaminated soil and preparation method and application thereof - Google Patents
Thermal desorption catalyst for aluminum nitride-based ceramic organic matter contaminated soil and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses an aluminum nitride-based ceramic organic matter contaminated soil thermal desorption catalyst and a preparation method thereof. Based on the mass of the carrier, the mass percentage of the catalytic active component is 1-5%, and the mass percentage of the cocatalyst is 0.5-1%. After the aluminum nitride powder is baked into a ceramic wafer at high temperature, the surface of the aluminum nitride ceramic is modified by using a plasma surface treatment instrument, then the activated carbon is subjected to acid cleaning corrosion by using dilute hydrochloric acid, the surface hydroxyl concentration of the aluminum nitride ceramic is further improved, and then the aluminum nitride ceramic is soaked in a mixed solution of an active component and a cocatalyst precursor, and is prepared by adsorption, drying and roasting. The catalyst is environment-friendly, high in mechanical strength and high in thermal conductivity, can realize 100% desorption of 3-chlorobiphenyl at 230 ℃, and greatly reduces thermal desorption energy consumption of 3-chlorobiphenyl. The product can be widely applied to the field of thermal desorption of soil organic pollutants.
Description
Technical Field
The invention relates to a thermal desorption catalyst for aluminum nitride-based ceramic organic matter contaminated soil, and a preparation method and application thereof, and belongs to the field of environment-friendly catalytic materials and soil remediation.
Background
With the rapid development of economy and town construction and the issuance of relevant national policies, a large number of organic pollution sites are left behind by chemical enterprises. The organic matters not only directly cause great harm to soil animals, plants, microorganisms and ecological systems, but also can enter human bodies through modes of steam inhalation, skin contact and the like, thereby causing great harm to the human bodies. The remediation and treatment work of the soil in the organic matter polluted site becomes a major problem which is unavoidable and relevant to the livelihood, and the remediation and treatment requirements have great social value and economic value.
Research on various repair technologies and equipment for organic contaminated sites is widely carried out in recent years, and related research results are also applied to contaminated site repair. The thermal desorption remediation technology has the advantages of high treatment efficiency, short remediation period, wide application range and the like, and is widely applied to the fields of treating soil, sludge, sediments and the like containing volatile and semi-volatile organic pollutants. The pollutants which can be treated by thermal desorption comprise polychlorinated biphenyl, nitrobenzene, polybrominated diphenyl ether, chlorobenzene, mercury, polycyclic aromatic hydrocarbon and the like. However, the pollutants in the polluted soil area are distributed unevenly, the pollutants tend to have higher boiling points, and a large amount of heat energy is consumed in the treatment process. Wherein, the organic matters such as polychlorinated biphenyl and the like have large molecular weight and high boiling point, so that the energy required by thermal desorption is obviously increased. Patent CN103658165A indicates that the high-temperature tail gas generated in the repairing process is the main part of the heat energy loss in the thermal desorption system, and for the traditional rotary kiln heating system, the soil treatment capacity is 25m3And at the time of/h, the heat loss emitted by the high-temperature flue gas is 30-60%. The high-temperature flue gas brings heat loss and simultaneously can also generate the problem of difficult tail gas treatment, resulting in increased tail gas treatment cost. Therefore, how to reduce heat loss and reduce the disposal cost of the polluted soil by optimizing the thermal desorption system has important engineering significance.
Disclosure of Invention
The invention aims to provide a thermal desorption catalyst for soil polluted by aluminum nitride ceramic-based organic matters, aiming at the current situation and problems of the existing thermal desorption of soil, and the invention also aims to provide a preparation method and application of the catalyst.
A thermal desorption catalyst for the soil polluted by ceramic-based organic matters of aluminum nitride is prepared from ceramic disk of aluminum nitride as carrier, La-Y composite oxide as catalytic active component, and nickel oxide as cocatalyst. Based on the mass of the carrier, the mass percentage of the catalytic active component is 1-5%, the mass percentage of the cocatalyst is 0.5-1%, and the mass ratio of lanthanum oxide to yttrium oxide in the active component is 1: (0.2 to 1).
A preparation method of the catalyst comprises the following steps:
(1) preparation of ceramic wafer carrier
Pressurizing the aluminum nitride powder in a die, maintaining the pressure to obtain a ceramic wafer blank, and calcining the ceramic wafer blank in a kiln under the protective atmosphere of nitrogen to obtain an aluminum nitride ceramic wafer;
(2) ceramic wafer carrier surface modification
Placing the aluminum nitride ceramic wafer into a plasma surface treatment instrument, vacuumizing the plasma surface treatment instrument, then filling oxygen, and performing surface treatment to form an oxide layer on the surface of the aluminum nitride ceramic wafer; then placing the modified aluminum nitride ceramic wafer into a dilute hydrochloric acid solution, and soaking and corroding for 6-12 h to obtain a ceramic wafer carrier with the modified surface;
(3) preparation of mixed solution of active component and cocatalyst precursor
Weighing lanthanum salt, yttrium salt and nickel salt, adding the lanthanum salt, the yttrium salt and the nickel salt into deionized water, and stirring the mixture in a water bath at 50-70 ℃ until the solution is clear and transparent to obtain a mixed solution of an active component and a cocatalyst precursor;
(4) catalyst preparation
And (3) soaking the surface-modified ceramic wafer carrier prepared in the step (2) in the mixed solution of the active component and the cocatalyst precursor prepared in the step (3), placing the mixed solution in a forced air drying oven for heat preservation and drying after the mixed solution is completely adsorbed by the surface-modified ceramic wafer carrier, and then placing the dried mixed solution in a muffle furnace for roasting to prepare the aluminum nitride ceramic-based organic matter polluted soil thermal desorption catalyst.
The preparation method comprises the following steps: the aluminum nitride powder in the step (1) is YB-AlN (Beijing & Pang New Material science and technology Co., Ltd.), the pressurizing pressure is 10-15 MPa, the pressure maintaining time is 1-3 min, the gas flow rate of the protective atmosphere nitrogen is 10-30 min/mL, the calcining temperature is 1600-1800 ℃, and the heat preservation time is 6-12 h.
The preparation method comprises the following steps: the Plasma surface treatment instrument in the step (2) is a Plasma clean-PL-5010 model (Wenzhou Ke Ling environmental protection science and technology Co., Ltd.), the input voltage is 220V, the working distance is 5-12 mm, the Plasma flame scanning speed is 20-100 mm/s, and the surface treatment time is 1-3 h.
The preparation method comprises the following steps: the volume/mass ratio of the oxygen gas/aluminum nitride ceramic charged in the step (2) is (1-2) mL: 1g, wherein the mass ratio of the aluminum nitride ceramic wafer to the dilute hydrochloric acid solution is 1: 15-20 percent, and the mass concentration of the dilute hydrochloric acid is 10-15 percent.
The preparation method comprises the following steps: the lanthanum salt in the step (3) is lanthanum nitrate hexahydrate or lanthanum chloride heptahydrate, the yttrium salt is yttrium nitrate hexahydrate or yttrium chloride hexahydrate, the nickel salt is nickel nitrate hexahydrate or nickel chloride hexahydrate, and the mass ratio of the lanthanum salt to deionized water is 1: (2-5).
The preparation method comprises the following steps: the drying temperature in the step (4) is 80-100 ℃, and the drying time is 4-6 h; the roasting temperature is 400-500 ℃, and the heat preservation is carried out for 1.5-3 h.
The technical scheme of the invention is as follows: the application of the catalyst in degrading organic pollutants in soil.
Further: the organic pollutant is 3-chlorobiphenyl.
In the technical scheme of the invention: the aluminum nitride ceramic wafer is obtained by baking aluminum nitride powder at high temperature to obtain a ceramic wafer, modifying the surface of the aluminum nitride ceramic by using a plasma surface treatment instrument, and then performing acid pickling corrosion on activated carbon by using dilute hydrochloric acid to further improve the concentration of hydroxyl on the surface of the aluminum nitride ceramic.
The thermal desorption experimental conditions and results of the invention are as follows: 50g of soil containing 1% of 3-chlorobiphenyl is loaded into a catalyst performance evaluation reaction device, the inner diameter of a quartz tube in the evaluation reaction device is 20mm, and hot air at 190-230 ℃ is introduced for performance evaluation. The soil heating temperature is 190-230 ℃, and the usage amount of the catalyst is 3 pieces (15 g in total). The desorption effect of the 3-chlorobiphenyl can reach 100 percent when the thermal desorption is carried out for 20min at 230 ℃, and the activity of the catalyst is still stable and unchanged after the catalyst is used for 10 times in a circulating manner.
Has the advantages that:
the catalyst prepared by the invention has the following advantages:
(1) the aluminum nitride ceramic carrier not only has high thermal conductivity, can promote the catalyst to form a local high-temperature area under the same circulating hot air and time conditions, shortens the gasification time of organic pollutants, reduces the environmental temperature required by the activation of the organic pollutants on the surface of the catalyst, but also has higher mechanical strength, can easily separate the soil from the catalyst after the thermal desorption is finished, and simultaneously ensures that the catalyst is not damaged in the process of pumping out the soil;
(2) the active component lanthanum yttrium composite oxide and the cocatalyst nickel oxide have excellent oxidation-reduction performance, and can catalyze and decompose 3-chlorobiphenyl into small molecules at low temperature, so that the thermal desorption temperature of the 3-chlorobiphenyl is greatly reduced;
(3) the aluminum nitride ceramic carrier in the catalyst is subjected to surface modification to form a thin aluminum oxide layer, and the aluminum oxide layer, the active component and the cocatalyst have a synergistic catalytic effect, so that the catalytic thermal desorption effect is improved;
therefore, the catalyst prepared by the invention not only can greatly reduce the thermal desorption energy consumption of soil and reduce the industrial thermal desorption cost, but also has the advantages of environment-friendly components, simple preparation process, lower cost, high cost performance and stronger application and popularization values.
Drawings
FIG. 1 is a graph of the performance of the catalyst prepared in example 1;
FIG. 2 is a graph of the performance of the catalyst prepared in example 2;
FIG. 3 is a graph of the performance of the catalyst prepared in example 3;
Detailed Description
The invention is further illustrated by the following examples, without limiting the scope of the invention:
the aluminum nitride powder is YB-AlN type, and the manufacturer is as follows: beijing, Mingbang, New Material science and technology, Inc.
The Plasma surface treatment instrument is a Plasma clean-PL-5010 model, and the manufacturer comprises: wenzhou Ke Ling environmental protection technology, Inc.
Example 1
(1) Preparation of ceramic wafer carrier
Weighing 5g of aluminum nitride powder, adding the aluminum nitride powder into a mold, pressurizing to 10MPa, maintaining the pressure for 1min, taking out a sample, repeating the blank molding for 10 times to obtain 10 aluminum nitride ceramic blanks, and placing the aluminum nitride ceramic blanks in a kiln furnace, and keeping the temperature of 1600 ℃ for 6h under the protective atmosphere of nitrogen (the gas flow rate is 10min/mL) to calcine to obtain aluminum nitride ceramic wafers;
(2) ceramic wafer carrier surface modification
(3) preparation of mixed solution of active component and cocatalyst precursor
1.1075g of lanthanum nitrate hexahydrate, 0.2827g of yttrium nitrate hexahydrate and 0.9731g of nickel nitrate hexahydrate are weighed, added into 5.5375g of deionized water, and stirred in a water bath at 50 ℃ until the solution is clear and transparent, so that a mixed solution of an active component and a promoter precursor is obtained;
(4) preparation of the catalyst
Based on the mass of the carrier, according to the mass percent of the active component accounting for 1 percent of the mass of the carrier, the mass percent of the cocatalyst accounting for 0.5 percent of the mass of the carrier, the mass ratio of lanthanum oxide to yttrium oxide in the active component is 1: 0.2, weighing 50g of the surface-modified aluminum nitride ceramic wafer carrier prepared in the step (2), soaking the surface-modified aluminum nitride ceramic wafer carrier in the mixed solution of the active component and the cocatalyst precursor prepared in the step (3), completely adsorbing the mixed solution by the surface-modified ceramic wafer carrier, then placing the mixed solution in a forced air drying oven, preserving the heat at 80 ℃ for 4h for drying, and then placing the dried mixed solution in a muffle furnace, and roasting the dried mixed solution at 400 ℃ for 1.5h to prepare the aluminum nitride ceramic-based organic matter contaminated soil thermal desorption catalyst;
(4) test for catalytic Activity
As shown in figure 1, 50g of soil containing 1% of 3-chlorobiphenyl was loaded into a catalyst performance evaluation reaction apparatus, the inner diameter of a quartz tube in the evaluation reaction apparatus was 20mm, and hot air at 190 to 230 ℃ was introduced for performance evaluation. The soil heating temperature is 190-230 ℃, and the usage amount of the catalyst is 3 pieces (15 g in total). The desorption effect of the 3-chlorobiphenyl can reach 100 percent when the thermal desorption is carried out for 20min at 230 ℃, and the activity of the catalyst is still stable and unchanged after the catalyst is used for 10 times in a circulating manner.
Example 2:
(1) preparation of ceramic wafer carrier
Weighing 5g of aluminum nitride powder, adding the aluminum nitride powder into a mold, pressurizing to 15MPa, maintaining the pressure for 3min, taking out a sample, repeating the blank molding for 10 times to obtain 10 aluminum nitride ceramic blanks, and placing the aluminum nitride ceramic blanks in a kiln, keeping the temperature of the aluminum nitride ceramic blanks at 1800 ℃ under the protective atmosphere of nitrogen (the gas flow rate is 30min/mL) for 12h for calcination to obtain aluminum nitride ceramic wafers;
(2) ceramic wafer carrier surface modification
Placing 1 aluminum nitride ceramic wafer obtained in the step (1) into a plasma surface treatment instrument, vacuumizing the plasma surface treatment instrument, then filling 10mL of oxygen, performing surface treatment for 2 hours, wherein the input voltage is 220V, the working distance is 12mm, and the plasma flame scanning speed is 100mm/s, so as to form a thin aluminum oxide layer on the surface of the aluminum nitride ceramic wafer; repeating plasma surface modification for 10 times to obtain 10 plasma surface-modified aluminum nitride ceramic wafers, then placing the modified aluminum nitride ceramic wafers in 1000g of dilute hydrochloric acid solution with the mass concentration of 15%, and soaking for 12h to obtain surface-modified ceramic wafer carriers;
(3) preparation of mixed solution of active component and cocatalyst precursor
Weighing 2.8495g of lanthanum chloride heptahydrate, 3.3585g of yttrium chloride hexahydrate and 2.0249g of nickel chloride hexahydrate, adding 5.6990g of deionized water, and stirring in a water bath at 70 ℃ until the solution is clear and transparent to obtain a mixed solution of an active component and a cocatalyst precursor;
(4) preparation of the catalyst
Based on the mass of the carrier, according to the mass percent of the active component accounting for 5 percent of the mass of the carrier, the mass percent of the cocatalyst accounting for 1 percent of the mass of the carrier, the mass ratio of lanthanum oxide to yttrium oxide in the active component is 1: weighing 50g of the surface-modified aluminum nitride ceramic wafer carrier prepared in the step (2), soaking the surface-modified aluminum nitride ceramic wafer carrier in the mixed solution of the active component and the cocatalyst precursor prepared in the step (3), completely adsorbing the mixed solution by the surface-modified ceramic wafer carrier, then placing the surface-modified ceramic wafer carrier in a forced air drying oven, keeping the temperature of the surface-modified ceramic wafer carrier at 100 ℃ for 6 hours, drying the surface-modified ceramic wafer carrier, and then placing the surface-modified ceramic wafer carrier in a muffle furnace, and roasting the surface-modified ceramic wafer carrier at 500 ℃ for 3 hours to prepare the aluminum nitride ceramic-based organic matter contaminated soil thermal desorption catalyst;
(4) test for catalytic Activity
As shown in FIG. 2, 50g of soil containing 1% of 3-chlorobiphenyl was loaded in a catalyst performance evaluation reaction apparatus, the inner diameter of a quartz tube in the evaluation reaction apparatus was 20mm, and hot air at 190 to 230 ℃ was introduced for performance evaluation. The soil heating temperature is 190-230 ℃, and the usage amount of the catalyst is 3 pieces (15 g in total). The desorption effect of the 3-chlorobiphenyl can reach 100 percent when the thermal desorption is carried out for 30min at 190 ℃, and the activity of the catalyst is still stable and unchanged after the catalyst is recycled for 10 times.
Example 3:
(1) preparation of ceramic wafer carrier
Weighing 5g of aluminum nitride powder, adding the aluminum nitride powder into a mold, pressurizing to 15MPa, maintaining the pressure for 1min, taking out a sample, repeating the blank molding for 10 times to obtain 10 aluminum nitride ceramic blanks, and placing the aluminum nitride ceramic blanks in a kiln, and keeping the temperature of 1700 ℃ for 8h and calcining under the protective atmosphere of nitrogen (the gas flow rate is 20min/mL) to obtain aluminum nitride ceramic wafers;
(2) ceramic wafer carrier surface modification
Placing 1 aluminum nitride ceramic wafer obtained in the step (1) into a plasma surface treatment instrument, vacuumizing the plasma surface treatment instrument, filling 7mL of oxygen, performing surface treatment for 3 hours at an input voltage of 220V, a working distance of 8mm and a plasma flame scanning rate of 60mm/s, and thus forming a thin aluminum oxide layer on the surface of the aluminum nitride ceramic wafer; repeating plasma surface modification for 10 times to obtain 10 plasma surface-modified aluminum nitride ceramic wafers, then placing the modified aluminum nitride ceramic wafers in 900g of dilute hydrochloric acid solution with the mass concentration of 17%, and soaking for 10 hours to obtain surface-modified ceramic wafer carriers;
(3) preparation of mixed solution of active component and cocatalyst precursor
2.8495g of lanthanum chloride heptahydrate, 3.3585g of yttrium chloride hexahydrate and 0.9731g of nickel nitrate hexahydrate are weighed and added into 5.6990g of deionized water, and the mixture is stirred in a water bath at 70 ℃ until the solution is clear and transparent, so that a mixed solution of an active component and a promoter precursor is obtained;
(4) preparation of the catalyst
Based on the mass of the carrier, according to the mass percent of the active component accounting for 5 percent of the mass of the carrier, the mass percent of the cocatalyst accounting for 0.5 percent of the mass of the carrier, the mass ratio of lanthanum oxide to yttrium oxide in the active component is 1: weighing 50g of the surface-modified aluminum nitride ceramic wafer carrier prepared in the step (2), soaking the surface-modified aluminum nitride ceramic wafer carrier in the mixed solution of the active component and the cocatalyst precursor prepared in the step (3), completely adsorbing the mixed solution by the surface-modified ceramic wafer carrier, then placing the mixed solution in a forced air drying oven, keeping the temperature at 90 ℃ for 6 hours for drying, and then placing the dried mixed solution in a muffle furnace, roasting the dried mixed solution at 450 ℃ for 2 hours to prepare the aluminum nitride ceramic-based organic matter contaminated soil thermal desorption catalyst;
(4) test for catalytic Activity
As shown in FIG. 3, 50g of soil containing 1% of 3-chlorobiphenyl was loaded in a catalyst performance evaluation reaction apparatus, the inner diameter of a quartz tube in the evaluation reaction apparatus was 20mm, and hot air at 190 to 230 ℃ was introduced for performance evaluation. The soil heating temperature is 190-230 ℃, and the usage amount of the catalyst is 3 pieces (15 g in total). The desorption effect of the 3-chlorobiphenyl can reach 100 percent when the thermal desorption is carried out for 30min at 210 ℃, and the activity of the catalyst is still stable and unchanged after the catalyst is recycled for 10 times.
Comparative example 1
(1) Preparation of the catalyst
The conditions were the same as in example 1 except that the surface modification of step (2) was not performed on the aluminum nitride ceramic wafer carrier during the catalyst preparation;
(2) contrast effect
Compared with the example 1, the surface modification of the step (2) is not carried out during the preparation of the catalyst, and the mixed solution of the active component and the promoter precursor is difficult to be absorbed in the ceramic carrier, so that the aluminum nitride-based ceramic thermal desorption catalyst is difficult to prepare.
Comparative example 2
(1) Preparation of the catalyst
The same conditions as in example 2 were used except that the lanthanum yttrium composite oxide was not added as a catalytically active component during the preparation of the catalyst;
(2) test for catalytic Activity
50g of soil containing 1% of 3-chlorobiphenyl is loaded into a catalyst performance evaluation reaction device, the inner diameter of a quartz tube in the evaluation reaction device is 20mm, and hot air at 190-230 ℃ is introduced for performance evaluation. The soil heating temperature is 190-230 ℃, and the usage amount of the catalyst is 3 pieces (15 g in total). The desorption effect of the 3-chlorobiphenyl at 230 ℃ for 30min is 54 percent.
(3) Contrast effect
Compared with the embodiment 2, the catalyst is prepared without adding the lanthanum-yttrium composite oxide as the catalytic active component, although the promoter nickel oxide also has certain redox performance, and 3-chlorobiphenyl is catalytically degraded into micromolecules, so that the catalyst has certain thermal desorption activity at the temperature lower than the boiling point of 3-chlorobiphenyl, but the thermal desorption activity is obviously lower than that of the aluminum nitride ceramic-based catalyst with the lanthanum-yttrium composite oxide as the catalytic active component.
Comparative example 3
(1) Preparation of the catalyst
The conditions were the same as in example 3 except that the aluminum nitride powder was replaced with alumina powder in the preparation of the catalyst;
(2) test for catalytic Activity
50g of soil containing 1% of 3-chlorobiphenyl is loaded into a catalyst performance evaluation reaction device, the inner diameter of a quartz tube in the evaluation reaction device is 20mm, and hot air at 190-230 ℃ is introduced for performance evaluation. The soil heating temperature is 190-230 ℃, and the using amount of the catalyst is 3 pieces (15 g in total). The desorption effect of the 3-chlorobiphenyl can reach 61 percent when the thermal desorption is carried out for 30min at 230 ℃.
(3) Contrast effect
Compared with the embodiment 3, the aluminum nitride powder is replaced by the alumina powder, the thermal conductivity of the catalyst is obviously reduced, and the catalyst cannot form a local high-temperature area under the same circulating hot air and time conditions, so that the gasification time of organic pollutants is prolonged, and the activity is obviously reduced.
Claims (9)
1. The thermal desorption catalyst for the aluminum nitride ceramic-based organic matter contaminated soil is characterized in that: the catalyst takes an aluminum nitride ceramic wafer as a carrier, a lanthanum-yttrium composite oxide as a catalytic active component and nickel oxide as a cocatalyst. Based on the mass of the carrier, the mass percentage of the catalytic active component is 1-5%, the mass percentage of the cocatalyst is 0.5-1%, and the mass ratio of lanthanum oxide to yttrium oxide in the active component is 1: (0.2 to 1).
2. The preparation method of the thermal desorption catalyst for the soil polluted by the aluminum nitride ceramic-based organic matters, which is disclosed by claim 1, is characterized by comprising the following steps of: the preparation method of the catalyst comprises the following steps:
(1) preparation of ceramic wafer carrier
Pressurizing the aluminum nitride powder in a die, maintaining the pressure to obtain a ceramic wafer blank, and calcining the ceramic wafer blank in a kiln under the protective atmosphere of nitrogen to obtain an aluminum nitride ceramic wafer;
(2) ceramic wafer carrier surface modification
Placing the aluminum nitride ceramic wafer into a plasma surface treatment instrument, vacuumizing the plasma surface treatment instrument, then filling oxygen, and performing surface treatment to form an oxide layer on the surface of the aluminum nitride ceramic wafer; then placing the modified aluminum nitride ceramic wafer into a dilute hydrochloric acid solution, and soaking and corroding for 6-12 h to obtain a ceramic wafer carrier with the modified surface;
(3) preparation of mixed solution of active component and cocatalyst precursor
Weighing lanthanum salt, yttrium salt and nickel salt, adding the lanthanum salt, the yttrium salt and the nickel salt into deionized water, and stirring the mixture in a water bath at 50-70 ℃ until the solution is clear and transparent to obtain a mixed solution of an active component and a cocatalyst precursor;
(4) catalyst preparation
And (3) soaking the surface-modified ceramic wafer carrier prepared in the step (2) in the mixed solution of the active component and the cocatalyst precursor prepared in the step (3), placing the mixed solution in a forced air drying oven for heat preservation and drying after the mixed solution is completely adsorbed by the surface-modified ceramic wafer carrier, and then placing the dried mixed solution in a muffle furnace for roasting to prepare the aluminum nitride ceramic-based organic matter polluted soil thermal desorption catalyst.
3. The preparation method of the thermal desorption catalyst for the aluminum nitride ceramic-based organic matter contaminated soil according to claim 2, which is characterized in that: the pressurizing pressure of the aluminum nitride powder in the step (1) is 10-15 MPa, the pressure maintaining time is 1-3 min, the gas flow rate of nitrogen in the protective atmosphere is 10-30 min/mL, the calcining temperature is 1600-1800 ℃, and the heat preservation time is 6-12 h.
4. The preparation method of the thermal desorption catalyst for the aluminum nitride ceramic-based organic matter contaminated soil according to claim 2, which is characterized in that: the Plasma surface treatment instrument in the step (2) is of a Plasma clean-PL-5010 type, the input voltage is 220V during surface treatment, the working distance is 5-12 mm, the Plasma flame scanning speed is 20-100 mm/s, and the surface treatment time is 1-3 h.
5. The preparation method of the thermal desorption catalyst for the aluminum nitride ceramic-based organic matter contaminated soil according to claim 2, which is characterized in that: the volume/mass ratio of the oxygen to the aluminum nitride ceramic charged in the step (2) is (1-2) mL: 1g, wherein the mass ratio of the aluminum nitride ceramic wafer to the dilute hydrochloric acid solution is 1: 15-20 percent, and the mass concentration of the dilute hydrochloric acid is 10-15 percent.
6. The preparation method of the thermal desorption catalyst for the aluminum nitride ceramic-based organic matter contaminated soil according to claim 2, which is characterized in that: the lanthanum salt in the step (3) is lanthanum nitrate hexahydrate or lanthanum chloride heptahydrate, the yttrium salt is yttrium nitrate hexahydrate or yttrium chloride hexahydrate, and the nickel salt is nickel nitrate hexahydrate or nickel chloride hexahydrate.
7. The preparation method of the thermal desorption catalyst for the aluminum nitride ceramic-based organic matter contaminated soil according to claim 2, which is characterized in that: the drying temperature in the step (4) is 80-100 ℃, and the drying time is 4-6 h; the roasting temperature is 400-500 ℃, and the heat preservation is carried out for 1.5-3 h.
8. Use of the catalyst of claim 1 for degrading organic pollutants in soil.
9. Use according to claim 8, characterized in that: the organic pollutant is 3-chlorobiphenyl.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170309514A1 (en) * | 2016-04-26 | 2017-10-26 | Lam Research Corporation | Oxidizing treatment of aluminum nitride films in semiconductor device manufacturing |
| CN110756213A (en) * | 2019-11-07 | 2020-02-07 | 中国科学院上海高等研究院 | Aluminum nitride-based catalyst, preparation method and application |
| CN113019412A (en) * | 2021-03-08 | 2021-06-25 | 大连理工大学 | Catalyst for preparing olefin by light alkane dehydrogenation, preparation method and application thereof |
| CN113731409A (en) * | 2021-09-28 | 2021-12-03 | 昆明理工大学 | Catalytic oxidation purification catalyst for thermal desorption waste gas of organic contaminated soil and preparation method and application thereof |
| CN113877597A (en) * | 2021-08-06 | 2022-01-04 | 南京工业大学 | Thermal desorption monatomic catalyst for organic matter contaminated soil and preparation method thereof |
-
2022
- 2022-03-24 CN CN202210294751.3A patent/CN114602525B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170309514A1 (en) * | 2016-04-26 | 2017-10-26 | Lam Research Corporation | Oxidizing treatment of aluminum nitride films in semiconductor device manufacturing |
| CN110756213A (en) * | 2019-11-07 | 2020-02-07 | 中国科学院上海高等研究院 | Aluminum nitride-based catalyst, preparation method and application |
| CN113019412A (en) * | 2021-03-08 | 2021-06-25 | 大连理工大学 | Catalyst for preparing olefin by light alkane dehydrogenation, preparation method and application thereof |
| CN113877597A (en) * | 2021-08-06 | 2022-01-04 | 南京工业大学 | Thermal desorption monatomic catalyst for organic matter contaminated soil and preparation method thereof |
| CN113731409A (en) * | 2021-09-28 | 2021-12-03 | 昆明理工大学 | Catalytic oxidation purification catalyst for thermal desorption waste gas of organic contaminated soil and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 上海半导体器件研究所, 上海半导体器件研究所 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115254131A (en) * | 2022-08-09 | 2022-11-01 | 南京工业大学 | Thermal desorption catalyst for solid heat carrier organic matter contaminated soil and preparation method thereof |
| CN115254131B (en) * | 2022-08-09 | 2023-04-25 | 南京工业大学 | Thermal desorption catalyst for solid heat carrier organic matter contaminated soil and preparation method thereof |
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