Method for preparing low-temperature high-activity catalyst by semi-dry ball milling and application thereof

Abstract

The application relates to a method for preparing a low-temperature high-activity catalyst by a semi-dry ball milling method and application, and the method comprises the following steps: S110, preparing mixed mud B containing active component salt and carrier salt; S120, stirring the mixed mud B at a temperature of 20-40 DEG C to obtain a semi-dry viscous precursor mud; S130, ball milling the semi-dry viscous precursor mud product to obtain a high-uniform-dispersion precursor mud; and S140, drying and calcining the high-uniform-dispersion precursor mud to obtain a low-temperature high-activity catalyst. The catalyst has a low tail gas (NOx, VOC and CO) treatment temperature and high reaction catalytic activity, and the preparation method is simple in operation and simple in equipment requirement.

Description

Technical Field

[0001] This application relates to the technical field of industrial waste gas purification, and in particular to a method for preparing a low-temperature, highly active catalyst using a semi-dry ball milling process and its application. Background Technology

[0002] The main sources of smog are SO2 and NO emitted during coal-fired power generation, chemical production, and other coal-fired processes. x Among the many precursor substances, nitrogen oxides (NOx) are represented by NO and NO2, such as VOCs, CO, and dust. x Nitrogen oxides are one of the major air pollutants. Large emissions of nitrogen oxides can cause a series of problems such as acid rain, photochemical smog, eutrophication of water bodies, greenhouse effect and ozone layer depletion, which seriously damage the ecological environment and cause great harm to the ecological balance of nature and human health.

[0003] NO in the atmosphere x NO is mainly divided into natural sources and anthropogenic sources. Natural sources of NO... x NO mainly comes from natural phenomena such as lightning and volcanic eruptions, as well as microbial activity and the oxidative decomposition of organisms. x Emissions are relatively stable in quantity and can maintain a basic balance. NO emissions from natural sources... x This is part of the normal ecological cycle and will not cause air pollution. NO in the atmosphere... x More than half of all air pollution is caused by human activities. Human-caused pollutants originate from two sources: emissions from stationary sources (such as thermal power plants, steel mills, and other nitrogen-containing industries) and emissions from mobile sources (such as motor vehicles) containing nitrogen in their exhaust. While coal consumption has been declining year by year due to increasingly stringent air pollutant emission standards in recent years, it still accounts for more than 50% of all energy consumption. In the combustion of traditional energy sources, primarily coal, various air pollutants are inevitably generated, leading to a significant increase in greenhouse gases (GHG) and causing severe environmental pollution.

[0004] Similarly, volatile organic compounds (VOCs) in the atmosphere are mainly divided into natural and anthropogenic sources. In industrial production, such as printing, painting, chemical, pharmaceutical, and semiconductor manufacturing, exhaust emissions and the combustion of fuel in transportation vehicles such as cars, trucks, and ships all produce VOCs. Everyday products like cleaning agents, paints, adhesives, perfumes, cosmetics, cooking, heating, and gas water heaters also generate VOCs, all of which contribute to serious environmental pollution.

[0005] We need to treat the exhaust gases generated in industrial production. This mainly involves denitrification, CO removal, and VOC removal.

[0006] Therefore, developing catalysts with good low-temperature performance is the key to solving the above problems. Summary of the Invention

[0007] To address the technical problems mentioned above, this application proposes a method for preparing low-temperature, highly active catalysts using a semi-dry ball milling process, employing the following technical solution:

[0008] In a first aspect, this application proposes a method for preparing a low-temperature, highly active catalyst using a semi-dry ball milling process, comprising the following steps:

[0009] S110. Prepare mixed mud material B containing active component salt and carrier salt;

[0010] S120. Stir the mixed clay material B at a temperature of 20-40℃ to obtain a semi-dry viscous precursor clay material.

[0011] S130. The semi-dry viscous precursor mud product is ball-milled to obtain a highly uniformly dispersed precursor mud.

[0012] S140. A low-temperature, high-activity catalyst is obtained by drying and calcining a highly uniformly dispersed precursor sludge.

[0013] By adopting the above technical solution, the preparation method of the present invention is simple to operate and requires minimal equipment. Furthermore, the low-temperature, highly active catalyst prepared by this method exhibits a lower tail gas treatment temperature and higher catalytic activity.

[0014] Preferably, S110 includes:

[0015] S111. Add organic solvent dropwise to the carrier salt powder until the powder becomes viscous, and stir at 20-40℃ for 0.5-2 hours to obtain carrier mud A;

[0016] S112. The active component salt powder is mixed into the carrier mud material A to obtain mixed mud material B.

[0017] Preferably, in S112, the concentration of the active component salt in the mixed mud B is 1-20 wt%.

[0018] Preferably, the carrier salt is one of titanium salt, aluminum salt, and zirconium salt;

[0019] The active component salt is one of vanadium salt, tungsten salt, iron salt, manganese salt, and cobalt salt;

[0020] The organic solvent is a volatile alcohol or ketone organic compound.

[0021] Preferably, the titanium salt is selected from TiO(OH)2, TiCl3, or hydrates of the above components;

[0022] The aluminum salt is selected from Al(NO3)3, AlCl3, or hydrates of the above components;

[0023] The zirconium salt is selected from Zr(NO3)4, ZrCl4, or hydrates of the above components;

[0024] The vanadium salt is selected from NH4VO3, VOC2O4, VOCl3 or hydrates of the above components;

[0025] The tungsten salt is selected from (NH4)6W7O24, (NH4)10W12O41 or hydrates of the above components;

[0026] The iron salt is selected from Fe(NO3)3, FeCl3, or hydrates of the above components;

[0027] The manganese salt is selected from hydrates of MnCl2, Mn(NO3)2 or more of the above components;

[0028] The cobalt salt is selected from Co(NO3)2, CoCl2, or hydrates of the above components.

[0029] Preferably, the ball milling conditions in step S130 include: a ball milling speed of 4000-6000 RPM, a ball milling time of 5-20 min forward, 20-60 s stop, 5-20 min reverse, and 20-60 s stop, repeated 1-4 times.

[0030] Preferably, the drying conditions in step S140 include: a temperature of 90–120°C and a time of 18–24 hours;

[0031] The calcination conditions described in step S140 include: temperature 350–450°C, time 3–6 h;

[0032] The calcination conditions described in step S140 also include: calcination in an oxygen atmosphere, and a heating rate of 2-10°C / minute.

[0033] Secondly, this application also proposes a low-temperature high-activity catalyst, which is prepared by the method described in the first aspect.

[0034] Preferably, the low-temperature high-activity catalyst comprises 5-20 wt% of an active component and the balance of a support component, wherein the active component comprises one of vanadium oxide, tungsten oxide, manganese oxide, iron oxide, or cobalt oxide, and the support component comprises one of titanium oxide, aluminum oxide, or zirconium oxide.

[0035] Thirdly, this application also proposes the application of a low-temperature, high-activity catalyst in the purification of industrial waste gas, wherein the purification of industrial waste gas includes tail gas denitrification and VOC removal.

[0036] The low-temperature, high-activity catalyst of this invention exhibits a lower tail gas (NOx, VOC, CO) treatment temperature and higher catalytic activity. Furthermore, the preparation method of this invention is simple to operate and requires minimal equipment. Through a semi-dry ball milling method, the carrier and active component powder are dissolved using organic alcohols and ketones as solvents, and the active substances are further dispersed using a ball mill, resulting in a catalyst with good dispersion, high active component loading, and high catalytic activity. Such a catalyst exhibits lower tail gas treatment temperatures for denitrification, VOC removal, and CO removal, while maintaining high catalytic activity. The preparation method of this invention is simple to operate and requires minimal equipment, making it suitable for industrial promotion and application. Attached Figure Description

[0037] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of this application. Other embodiments and many anticipated advantages of these embodiments will be readily recognized as they become better understood through reference to the following detailed description. Elements in the drawings are not necessarily to scale. The same reference numerals refer to corresponding similar parts.

[0038] Figure 1 This is a flowchart of a method for preparing a low-temperature, highly active catalyst using a semi-dry ball milling process according to the present invention.

[0039] Figure 2 This is a TEM image of the low-temperature, highly active vanadium-titanium denitration catalyst prepared in this invention.

[0040] Figure 3 This is a schematic diagram of the denitrification experiment results in Example 1-4.

[0041] Figure 4 This is a schematic diagram of the VOC oxidation experiment results applied in Example 5-8.

[0042] Figure 5 The adsorption curve of the low-temperature, highly active vanadium-titanium denitration catalyst prepared in this invention is shown. Detailed Implementation

[0043] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Firstly, referring to Figure 1This application discloses a method for preparing a low-temperature, highly active catalyst using a semi-dry ball milling process, comprising the following steps:

[0046] S110. Prepare mixed mud material B containing active component salt and carrier salt;

[0047] In a specific embodiment, S110 specifically includes:

[0048] S111. Add organic solvent dropwise to the carrier salt powder until the powder becomes viscous, and stir at 20-40℃ for 0.5-2 hours to obtain carrier mud A;

[0049] S112. The active component salt powder is mixed into the carrier mud material A to obtain mixed mud material B;

[0050] In a specific embodiment, in step S112, the concentration of the active component salt in the mixed mud B is 1-20 wt%, preferably 10-20 wt%.

[0051] In a specific embodiment, the carrier salt is selected from one of titanium salt, aluminum salt, and zirconium salt;

[0052] The active component salt is selected from one of vanadium salt, tungsten salt, iron salt, manganese salt, and cobalt salt;

[0053] The organic solvent is selected from volatile alcohols and ketones such as ethanol, isopropanol, n-propanol, or acetone.

[0054] In specific embodiments, the titanium salt is selected from TiO(OH)2, TiCl3, and their hydrates;

[0055] The aluminum salt is selected from Al(NO3)3, AlCl3, or their hydrates;

[0056] The zirconium salt is selected from Zr(NO3)4, ZrCl4, or their hydrates;

[0057] The vanadium salt is selected from NH4VO3, VOC2O4, VOCl3 or their hydrates;

[0058] The tungsten salt is selected from (NH4)6W7O 24 (NH4) 10 W 12 O 41 Or their hydrates;

[0059] The iron salt is selected from Fe(NO3)3, FeCl3, or their hydrates;

[0060] The manganese salt is selected from MnCl2, Mn(NO3)2 or their hydrates;

[0061] The cobalt salt is selected from Co(NO3)2, CoCl2, or their hydrates.

[0062] S120. Stir the mixed clay material B at a temperature of 20-40℃ to obtain a semi-dry viscous precursor clay material.

[0063] S130. The semi-dry viscous precursor mud product is ball-milled to obtain a highly uniformly dispersed precursor mud.

[0064] In a specific embodiment, the ball milling conditions in step S130 include: a ball milling speed of 4000-6000, preferably 5000-5400; and a ball milling time of 5-20 min forward rotation, 20-60 s stop, 5-20 min reverse rotation, 20-60 s stop, and repeated 1-4 times, preferably 10-15 min forward rotation, 30-40 s stop, 10-15 min reverse rotation, 30-40 s stop, and repeated 2-3 times.

[0065] S140. A low-temperature, high-activity catalyst is obtained by drying and calcining a highly uniformly dispersed precursor sludge.

[0066] In a specific embodiment, the drying conditions in step S140 include: a temperature of 90–120°C, preferably 100–110°C; and a time of 18–24 hours.

[0067] In a specific embodiment, the calcination conditions in step S140 include: a temperature of 350–450°C, preferably 390–420°C; a time of 3–6 h; preferably, the calcination conditions in step S130 further include: being carried out in an oxygen atmosphere; and / or a heating rate of 2–10°C / min, preferably 4–6°C / min.

[0068] Example 1

[0069] 1) Add 9.8g of TiO(OH)2 powder to 10ml of ethanol solution, stir at 25℃ until the powder becomes viscous, and stir for 1h to obtain semi-dry mud material A.

[0070] 2) Add 2.58g NH4VO3 to semi-dry clay A to obtain mixed clay B. Then stir mixed clay B at 25℃ for 1h to obtain semi-dry precursor clay A.

[0071] 3) Add the semi-dry precursor mud A to the ball mill jar, and cycle it twice at a speed of 5400 r / min, for 10 min forward, 30 s stop, 10 min reverse, and 30 s stop, to obtain a uniformly dispersed semi-dry mixed mud C.

[0072] 4) The uniformly dispersed semi-dry mixed sludge C was dried in a vacuum drying oven at a vacuum degree of -0.06 MPa, a temperature of 100℃, and a time of 24 h. After drying, the material was calcined at 410℃ for 4 h in air at a heating rate of 5℃ / min. The resulting material is the low-temperature high-activity vanadium-titanium denitration catalyst VTi-high-speed ball milling method A prepared by the semi-dry ball milling method. The TEM image of the low-temperature high-activity vanadium-titanium denitration catalyst VTi-high-speed ball milling method A prepared in this example is shown below. Figure 2 As shown in (a) in the figure.

[0073] Example 2

[0074] The difference between this embodiment and Example 1 is that the 2.58g NH4VO3 in step 2) is replaced with 3.42g VOC2O4 as a precursor, and the resulting material is the low-temperature high-activity vanadium-titanium denitration catalyst VTi-high-speed ball milling method B prepared by semi-dry ball milling.

[0075] Example 3

[0076] 1) Add 9.8g of TiO(OH)2 powder to 10ml of ethanol solution, stir until the powder becomes viscous, and stir at 25℃ for 1h to obtain semi-dry mud material A.

[0077] 2) Add 7.28g Co(NO3)2·6H2O to semi-dry clay material A to obtain mixed clay material B. Then stir mixed clay material B at 25℃ for 1h to obtain semi-dry precursor clay material A.

[0078] 3) Add the semi-dry precursor mud A to the ball mill jar, and cycle it twice at a speed of 5400 r / min, for 10 min forward, 30 s stop, 10 min reverse, and 30 s stop, to obtain a uniformly dispersed semi-dry mixed mud C.

[0079] 4) The uniformly dispersed semi-dry mixed slurry C was dried in a vacuum drying oven at a vacuum degree of -0.06 MPa, a temperature of 100℃, and a time of 24 h. After drying, the material was calcined at 410℃ for 4 h in air at a heating rate of 5℃ / min. The resulting material is the low-temperature high-activity cobalt-titanium toluene oxidation catalyst CoTi-high-speed ball milling A prepared by the semi-dry ball milling method.

[0080] Example 4

[0081] The difference between this embodiment and Example 3 is that the 7.28g Co(NO3)2·6H2O in step 2) is replaced with 5.95g CoCl2·6H2O as the precursor. The resulting material is the low-temperature, high-activity cobalt-titanium toluene oxidation catalyst CoTi-high-speed ball milling method B prepared by semi-dry ball milling.

[0082] Comparative Example 1

[0083] 1) Take 2.58g of NH4VO3 and add it to 150g of distilled water. Stir at 25℃ for 0.5h until completely dissolved to obtain solution A.

[0084] 2) Dissolve 9.8g TiO(OH)2 in solution A and stir at 25℃ for 1h to obtain solution B.

[0085] 3) After mixing, the mixture was vacuum dried at 75°C for 2 hours using a rotary evaporator. Then, it was calcined at 410°C for 4 hours in air at a heating rate of 5°C / min. The resulting material is the VTi-excess impregnation method. A TEM image of the VTi-excess impregnation method prepared in this comparative example is shown below. Figure 2 As shown in (b) of the diagram.

[0086] Comparative Example 2

[0087] 1) Take 2.58g of NH4VO3 and calcine it at 410℃ for 4h in air atmosphere. The heating rate is 5℃ / min to obtain powder A.

[0088] 2) 9.8g TiO(OH)2 was calcined at 410℃ for 4h in air atmosphere with a heating rate of 5℃ / min to obtain powder B.

[0089] 3) Grind powder A and powder B thoroughly in an agate mortar for 10 minutes. The resulting material is the VTi-mechanical mixture. The TEM image of the VTi-mechanical mixture prepared in this comparative example is shown below. Figure 2 As shown in (c) in the figure.

[0090] Comparative Example 3

[0091] 1) Take 7.28g of Co(NO3)2·6H2O and add it to 150g of distilled water. Stir at 25℃ for 0.5h until completely dissolved to obtain solution A.

[0092] 2) Dissolve 9.8g TiO(OH)2 in solution A and stir at 25℃ for 1h to obtain solution B.

[0093] 3) After mixing, vacuum dry the mixture at 75°C using a rotary evaporator. Then calcine it at 410°C for 4 hours in air, with a heating rate of 5°C / min. The resulting material is the CoTi-excess impregnation method.

[0094] Comparative Example 4

[0095] 1) Take 7.28g of Co(NO3)2·6H2O and calcine it at 410℃ for 4h in air atmosphere. The heating rate is 5℃ / min to obtain powder A.

[0096] 2) 9.8g TiO(OH)2 was calcined at 410℃ for 4h in air atmosphere with a heating rate of 5℃ / min to obtain powder B.

[0097] 3) Grind powder A and powder B thoroughly in an agate mortar for 10 minutes. The resulting material is the CoTi-mechanical mixing method.

[0098] Secondly, embodiments of this application also disclose a low-temperature high-activity catalyst, which is prepared by the method described in the first aspect.

[0099] In a specific embodiment, the low-temperature high-activity catalyst comprises 5-20 wt% of active component and the balance of support component; more preferably, the low-temperature high-activity catalyst comprises 10-20 wt% of active component and the balance of support component oxide.

[0100] In a specific embodiment, the active component includes one of vanadium oxide, tungsten oxide, manganese oxide, iron oxide, and cobalt oxide; the support component includes one of titanium oxide, aluminum oxide, and zirconium oxide.

[0101] Thirdly, embodiments of this application also disclose the application of a low-temperature, highly active catalyst in exhaust gas denitrification and VOC removal.

[0102] Application Example 1

[0103] The material obtained in Example 1 was used as a catalyst in a denitrification experiment. The experimental conditions were as follows: the concentrations (vol%) of each gas were controlled by a mass flow meter: NO: 500 ppm, NH3: 500 ppm, O2: 5%, N2 as the balance gas, total gas flow rate: 1000 mL / min, and catalyst dosage: 200 mg. The results are as follows. Figure 3 As shown. The formula for calculating the denitrification efficiency is η=(C1-C2) / C1×100%, where C1 is the NOx concentration at the inlet and C2 is the NOx concentration at the outlet, obtained by flue gas analysis.

[0104] Application Example 2

[0105] The difference between this application example and application example 1 is that the material obtained in example 2 is used as a catalyst for denitrification experiments.

[0106] Application Example 3

[0107] The difference between this application example and application example 1 is that the material obtained from comparative example 1 is used as a catalyst in the denitrification experiment.

[0108] Application Example 4

[0109] The difference between this application example and application example 1 is that the material obtained from comparative example 2 is used as a catalyst in the denitrification experiment.

[0110] Application Example 5

[0111] The material obtained in Example 3 was used as a catalyst in a VOC oxidation experiment. Benzene was selected as the VOC. The experimental conditions were as follows: the concentration (vol%) of each gas was controlled by a mass flow meter: benzene: 500 ppm, O2: 5%, N2 as the balance gas, total gas flow rate: 1000 mL / min, and catalyst dosage: 200 mg. The results are as follows. Figure 4 As shown.

[0112] Application Example 6

[0113] The difference between this application example and application example 4 is that the material obtained in example 4 is used as a catalyst for denitrification experiments.

[0114] Application Example 7

[0115] The difference between this application example and application example 4 is that the material obtained from comparative example 3 is used as a catalyst in the denitrification experiment.

[0116] Application Example 8

[0117] The difference between this application example and application example 4 is that the material obtained in comparative example 4 is used as a catalyst in the denitrification experiment.

[0118] Application Examples 1-4 involve using the materials obtained in Examples 1, 2, 1 (Comparative Example), and 2 (Comparative Example 2) as catalysts in denitrification experiments, with the following results: Figure 3 As shown. (Through) Figure 3 The data shows that the semi-dry high-speed ball milling method of the present invention can achieve optimal low-temperature SCR activity, and the NOx removal rate reaches 100% in the temperature range of 225-450℃, with a widened temperature window.

[0119] Application Examples 5-8 show VOC oxidation experiments conducted using the materials obtained in Examples 3, 4, 3, and 4, respectively, as catalysts. The results are as follows. Figure 4 As shown. (Through) Figure 4 The data shows that the semi-dry high-speed ball milling method of the present invention can achieve optimal low-temperature catalytic oxidation activity for CoTi catalyst, with a conversion rate of 80% at 240℃ and 100% at 280℃; moreover, the preparation process is simple and the raw materials are inexpensive and readily available.

[0120] In addition, this application also conducted adsorption-desorption experiments on the materials obtained in Example 1, Comparative Example 1, and Comparative Example 2, respectively, and the experimental results are as follows. Figure 5 As shown. (Through) Figure 5The data shows that the catalytic material prepared by the semi-dry ball milling method in this invention has the largest specific surface area, while the catalytic material prepared by the mechanical mixing method has the smallest specific surface area. The ranking is: semi-dry ball milling > excessive impregnation > mechanical mixing.

[0121] In summary, compared with the prior art, the present invention has the following beneficial technical effects:

[0122] (1) The catalyst of the present invention has a lower tail gas (NOx, VOC, CO) treatment temperature and higher reaction catalytic activity, and the preparation method of the present invention is simple to operate and requires simple equipment. By using a semi-dry ball milling method, the carrier and active component powder are dissolved in organic alcohols and ketones as solvents, and the active substances are further dispersed using a ball mill to obtain a catalyst with good dispersion, high active component loading, and high catalytic activity. Such a catalyst has a lower tail gas treatment temperature for denitrification, deVOC removal, and deCO removal, and higher reaction catalytic activity.

[0123] (2) The preparation method of the present invention is simple to operate and requires minimal equipment. It is conducive to industrial promotion and application.

[0124] The specific embodiments of this application have been described above, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0125] In the description of this application, it should be understood that the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The simple fact that certain measures are recited in mutually different dependent claims does not indicate that combinations of these measures cannot be used for improvement. Any reference signs in the claims should not be construed as limiting the scope.

Claims

1. A method for the preparation of a low temperature high activity catalyst by semi-dry ball milling, characterized by: The method comprises the following steps: S110, drop volatile alcohol, ketone organic solvent into the carrier salt powder to make the powder into a viscous state, and stir at a temperature of 20-40℃ for 0.5-2h to obtain carrier paste A; mix the active component salt powder into the carrier paste A to obtain mixed paste B; S120, stir the mixed paste B at a temperature of 20-40℃ to obtain a semi-dry viscous precursor paste; S130, ball mill the semi-dry viscous precursor paste product to obtain a highly uniformly dispersed precursor paste; the rotation speed of ball milling is 4000-6000r / min, the ball milling time is 5-20min forward rotation, 20-60s stop, 5-20min reverse rotation, 20-60s stop, and the cycle is 1-4 times; S140, dry the highly uniformly dispersed precursor paste at 90-120℃ for 18-24h, then heat to 350-450℃ at a heating rate of 2-10℃ / min in an oxygen atmosphere and calcine for 3-6h to obtain a low-temperature high-activity catalyst; The carrier salt is one of titanium salt, aluminum salt and zirconium salt; The active component salt is one of vanadium salt, tungsten salt, iron salt, manganese salt and cobalt salt.

2. A process for the preparation of a low temperature high activity catalyst by semi-dry ball milling as claimed in claim 1 wherein: In the S110, the concentration of the active component salt in the mixed paste B is 1-20wt%.

3. The method for preparing a low-temperature high-activity catalyst by a semi-dry ball milling method according to claim 1, characterized in that: The titanium salt is selected from TiCl3 or a hydrate of the above component; The aluminum salt is selected from Al(NO3)3, AlCl3 or a hydrate of the above component; The zirconium salt is selected from Zr(NO3)4, ZrCl4 or a hydrate of the above component; The vanadium salt is selected from NH4VO3, VOC2O4 or a hydrate of the above component; said tungsten salt is selected from the group consisting of (NH4)6W7O 24 , (NH4) 10 W 12 O 41 or a hydrate of the above components; The iron salt is selected from Fe(NO3)3, FeCl3 or a hydrate of the above component; The manganese salt is selected from MnCl2, Mn(NO3)2 or a hydrate of the above component; The cobalt salt is selected from Co(NO3)2, CoCl2 or a hydrate of the above component.

4. A low temperature high activity catalyst characterized by: The low-temperature high-activity catalyst is prepared by the method of any one of claims 1-3.

5. The low temperature high activity catalyst of claim 4, wherein: The low-temperature high-activity catalyst comprises 5-20wt% active component and the balance of carrier component, the active component comprises one of vanadium oxide, tungsten oxide, manganese oxide, iron oxide or cobalt oxide, and the carrier component comprises one of titanium oxide, aluminum oxide or zirconium oxide.

6. Use of a low-temperature high-activity catalyst as claimed in claim 4 or 5 for the purification of industrial waste gases, characterized in that: The industrial waste gas purification includes tail gas denitration and VOC removal.

Images