CN112007682B - Low-temperature catalyst for treating methanol through catalytic oxidation and preparation method thereof - Google Patents
Low-temperature catalyst for treating methanol through catalytic oxidation and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of catalyst preparation, and particularly relates to a low-temperature catalyst for catalytic oxidation of methanol and a preparation method thereof. The low-temperature catalyst comprises a carrier and a coating coated on the carrier, wherein the coating amount of the coating is 60-180g/L, the coating contains noble metal Pt, the loading amount of the noble metal Pt is 0.1-3.0 g/L, and the coating also comprises tungsten-aluminum composite oxide W-Al 2 O 3 And boron nitride BN. The invention adopts W-Al with porous structure and large specific surface area 2 O 3 The catalyst is used as a substrate coating, plays a role of uniformly loading noble metal, and the addition of W can further increase Lewis acid sites of alumina, thereby effectively improving the performance of the catalyst coating; the noble metal competitive adsorbent can realize uniform loading and controllable distribution of noble metal; the addition of the hydrophobic material BN can obviously enhance the water resistance of the coating, and meanwhile, the weaker bonding effect between the BN and the Pt can provide more active oxygen for the surface of the catalyst, thereby being beneficial to the improvement of the low-temperature activity of the catalyst.
Description
Technical Field
The invention belongs to the technical field of catalyst preparation, and particularly relates to a low-temperature catalyst for treating methanol through catalytic oxidation and a preparation method thereof.
Background
With the increasing perfection of heating facilities in China and the rapid development of the motor vehicle industry, the type of air pollution in China has been shifted from soot type pollution to mixed type pollution of soot and motor vehicle tail gas, and the motor vehicle tail gas pollution has become a main source of air pollution in most large cities. The methanol fuel is the only economic liquid fuel which can be produced by using coal and natural gas as raw materials at present, and the production process is mature and is convenient to store and use. Studies have also shown that automobile emission of PM using methanol fuel 2.5 PM emitted by gasoline-fueled vehicle 2.5 About 50% lower. Therefore, the popularization of the methanol fuel becomes a realistic choice for reducing the exhaust emission of the motor vehicle and alleviating the haze weather.
It should be noted that the exhaust gas of the methanol fuel automobile contains harmful gaseous emissions such as unburned methanol, formaldehyde and the like, but at the same time, the exhaust gas temperature of the methanol internal combustion engine is lower and the water vapor content is higher, which all put higher performance requirements on the catalyst discharged by the tail gas of the methanol fuel automobile. The catalytic oxidation technology is the core of the methanol oxidation catalyst, and directly determines the removal efficiency of pollutants. Compared with other catalysts, the traditional noble metal catalysts of platinum (Pt) and palladium (Pd) have excellent activity, better selectivity and longer service life, and meanwhile, the noble metal loading is relatively lower, but the problems of uneven distribution, poor low-temperature activity, poor water resistance, high price and the like still exist. Therefore, the method improves the low-temperature ignition activity and the water resistance of the noble metal catalyst and optimizes the noble metal dosage of the catalyst by means of improving a noble metal loading process, screening a coating substrate material, adding a hydrophobic material and the like so as to realize the unification of the catalytic effect and the economy, and is a key problem in the tail gas treatment of the current methanol fuel vehicles.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-temperature catalyst for treating methanol by catalytic oxidation and a preparation method thereof aiming at the defects of the prior art. The preparation method of the catalyst is simple, the steps are easy to operate, the catalyst is particularly suitable for industrial large-scale production, and the prepared catalyst is outstanding in low-temperature activity and excellent in water resistance.
In order to solve the technical problems, the invention adopts the technical scheme that: the low-temperature catalyst for treating methanol by catalytic oxidation comprises a carrier and a coating coated on the carrier, wherein the coating amount of the coating is 60-180g/L, the coating contains noble metal Pt, the loading amount of the noble metal Pt is 0.1-3.0 g/L, and the coating also comprises tungsten-aluminum composite oxide W-Al 2 O 3 And boron nitride BN.
W-Al in the coating 2 O 3 The mass ratio of the boron nitride to BN is 1: 1-9: 1.
The W-Al 2 O 3 Middle W and Al 2 O 3 The mass ratio of (A) to (B) is 1: 9-1: 49.
The carrier is a cordierite honeycomb ceramic carrier or an iron-chromium-aluminum metal honeycomb carrier.
The preparation method of the low-temperature catalyst for treating methanol by catalytic oxidation comprises the following steps:
(1) preparation of W-Al by isovolumetric immersion method 2 O 3 : weighing ammonium tungstate and activated alumina powder, preparing an ammonium tungstate aqueous solution according to the saturated adsorption capacity of alumina, dropwise adding the prepared ammonium tungstate aqueous solution into the alumina, continuously stirring for 3-10 h, standing and aging for 8-24 h, drying at 100-160 ℃, and finally roasting at 400-600 ℃ for 2-4 h to obtain W-Al 2 O 3 Compounding powder;
(2) preparation of coating slurry: the required amount of W-Al 2 O 3 Adding the composite powder and BN powder into deionized water, stirring to form slurry, treating the slurry by adopting a ball milling process, and controlling the particles D of the slurry 90 8-20 μm to obtain coating slurry;
(3) loading of noble metal: calculating and weighing the amount of the precious metal Pt, wherein the loading amount of the precious metal Pt is 0.1-3.0 g/L, adding a competitive adsorbent into the weighed precursor solution of the precious metal Pt, uniformly stirring, then adding into the coating slurry obtained in the step (2), and stirring for more than 2 hours until the slurry is uniform;
(4) coating a carrier: soaking the carrier in the slurry prepared in the step (3) for 1-5 min, taking out, blowing through a channel in the carrier for 0.5-3 min, drying the carrier at 100-150 ℃ for 5-12 h, and finally roasting the carrier at 400-550 ℃ for 1-3 h to obtain the finished catalyst.
Further, W-Al in the coating slurry in the step (2) 2 O 3 And the mass ratio of the total mass of the BN to the deionized water is 2: 7-2: 3.
Further, the competitive adsorbent in step (3) is one or more combinations of polycarboxylic acids.
Further, the competitive adsorbent in the step (3) is one or more of tartaric acid, oxalic acid and malic acid.
Compared with the prior art, the invention has the following advantages:
the invention adopts W-Al with porous structure and large specific surface area 2 O 3 The catalyst is used as a substrate coating, plays a role of uniformly loading noble metal, and the addition of tungsten can further increase Lewis acid sites of alumina, thereby effectively improving the performance of the catalyst coating; the polycarboxylic acid is used as a noble metal competitive adsorbent, so that the adsorption state of the surface and the interior of the noble metal Pt substrate coating can be changed to a certain extent, and the uniform loading and controllable distribution of the noble metal are realized; the addition of the hydrophobic material BN can obviously enhance the water resistance of the coating, and meanwhile, the weaker bonding effect between the BN and the Pt can provide more active oxygen for the surface of the catalyst, thereby being beneficial to the improvement of the low-temperature activity of the catalyst.
The preparation method is simple, the steps are easy to operate, the method is particularly suitable for industrial large-scale production, and the prepared catalyst has the advantages of outstanding activity of low-temperature catalytic oxidation of methanol and excellent water resistance.
Detailed Description
The technical solution of the present invention will be further described with reference to specific examples.
Example 1
A low-temperature catalyst for catalytic oxidation treatment of methanol comprises a carrier and a coating coated on the carrier, wherein the catalyst carrier is cordierite honeycomb ceramic, the volume is 2.25L, the pore density is 200 meshes/square foot, noble metal Pt is loaded in the coating, and the catalyst also contains W-Al 2 O 3 And BN, wherein the total coating amount of the coating is 100g/L, and the loading amount of the noble metal Pt is 1.0 g/L.
The preparation method comprises the following steps:
(1) preparation of W-Al by isovolumetric immersion method 2 O 3 : 900g of Al is weighed 2 O 3 Powder and 139g of ammonium tungstate, based on Al 2 O 3 Preparing ammonium tungstate aqueous solution by saturated adsorption amount, and dropwise adding the prepared ammonium tungstate aqueous solution to Al 2 O 3 Stirring for 5h, standing, aging for 12h, drying at 120 deg.C for 12h, and calcining at 550 deg.C in muffle furnace for 2h to obtain W-Al 2 O 3 Wherein W and Al 2 O 3 The mass ratio of (A) to (B) is 1: 9;
(2) preparation of coating slurry: weighing 1200g of deionized water, and sequentially adding W-Al 2 O 3 570g and 190g of BN, evenly stirring to form coating slurry, and ball-milling the slurry until the granularity D of the slurry is reached 90 The resulting slurry was continuously stirred at 15 μm to obtain a coating slurry in which W-Al was present 2 O 3 The mass ratio of the BN to the BN is 3: 1;
(3) loading of noble metal: weighing a platinum nitrate solution containing 8.0g of pure Pt, adding 24g of tartaric acid into the platinum nitrate solution, stirring for 1h, dropwise adding the solution into the coating slurry, stirring for 2h, then adding 400g of alumina sol (with the content of cured substances being 10%), and continuously stirring for more than 2 h;
(4) coating of the slurry on the support: and (3) soaking the carrier in the slurry obtained in the step (3) for 2min, taking out, blowing off redundant slurry on the surface of the carrier and in the pore channel by using compressed air for 2min, drying in a drying oven at 120 ℃ for 8h, and roasting in a muffle furnace at 550 ℃ for 2h to obtain the catalyst A.
Example 2
A low-temperature catalyst for treating methanol by catalytic oxidation comprises a carrier and a coating coated on the carrier, wherein the catalyst carrier is cordierite honeycomb ceramic, the volume is 2.25L, and the pore density is 200 meshes/square foot; the coating is loaded with noble metal Pt and also contains W-Al 2 O 3 And BN, wherein the total coating amount of the coating is 100g/L, and the loading amount of the noble metal Pt is 1.0 g/L.
The preparation method comprises the following steps:
(1) preparation of W-Al by isovolumetric immersion method 2 O 3 : 980g of Al are weighed 2 O 3 Powder and 27.8g ammonium tungstate, based on Al 2 O 3 Preparing ammonium tungstate aqueous solution by saturated adsorption amount, and dropwise adding the prepared ammonium tungstate aqueous solution to Al 2 O 3 Stirring for 5h, standing, aging for 12h, drying at 120 deg.C for 12h, and calcining at 550 deg.C in muffle furnace for 2h to obtain W-Al 2 O 3 Wherein W and Al 2 O 3 The mass ratio of (A) to (B) is 1: 49;
(2) preparation of coating slurry: weighing 1200g of deionized water, and sequentially adding W-Al 2 O 3 570g and 190g of BN, evenly stirring to form coating slurry, and ball-milling the slurry until the granularity D of the slurry is reached 90 The resulting slurry was continuously stirred at 15 μm to obtain a coating slurry in which W-Al was present 2 O 3 The mass ratio of the BN to the BN is 3: 1;
(3) loading of noble metal: weighing a platinum nitrate solution containing 8.0g of pure Pt, adding 24g of tartaric acid into the platinum nitrate solution, stirring for 1h, dropwise adding the solution into the coating slurry, stirring for 2h, then adding 400g of alumina sol (with the content of cured substances being 10%), and continuously stirring for more than 2 h;
(4) coating of the slurry on the support: and (4) soaking the carrier in the slurry obtained in the step (3) for 2min, then taking out, blowing off redundant slurry on the surface of the carrier and in the pore channel by using compressed air for 2min, then drying in a drying oven at 120 ℃ for 8h, and roasting in a muffle furnace at 550 ℃ for 2h to obtain the catalyst B.
Example 3
A low-temperature catalyst for treating methanol by catalytic oxidation comprises a carrier and a coating coated on the carrier, wherein the catalyst carrier is cordierite honeycomb ceramic, the volume is 2.25L, and the pore density is 200 meshes/square foot; the coating is loaded with noble metal Pt and also contains W-Al 2 O 3 And BN, wherein the total coating amount of the coating is 100g/L, and the loading amount of the noble metal Pt is 1.0 g/L.
The preparation method comprises the following steps:
(1) preparation of W-Al by isovolumetric immersion method 2 O 3 : 900g of Al is weighed 2 O 3 Powder and 139g of ammonium tungstate, based on Al 2 O 3 Preparing ammonium tungstate aqueous solution by using the saturated adsorption amount, and dropwise adding the prepared ammonium tungstate aqueous solution to Al 2 O 3 Stirring for 5h, standing, aging for 12h, drying at 120 deg.C for 12h, and calcining at 550 deg.C in muffle furnace for 2h to obtain W-Al 2 O 3 Wherein W and Al 2 O 3 The mass ratio of (A) to (B) is 1: 9.
(2) Preparation of coating slurry: weighing 1200g of deionized water, and sequentially adding W-Al 2 O 3 684g and BN 76g, uniformly stirring to form coating slurry, ball-milling the slurry until the granularity of the slurry is D 90 The resulting slurry was continuously stirred at 15 μm to obtain a coating slurry in which W-Al was present 2 O 3 The mass ratio of the BN to the BN is 9: 1;
(3) loading of noble metal: weighing a platinum nitrate solution containing 8.0g of pure Pt, adding 24g of tartaric acid into the platinum nitrate solution, stirring for 1h, dropwise adding the solution into the coating slurry, stirring for 2h, then adding 400g of alumina sol (with the content of cured substances being 10%), and continuously stirring for more than 2 h;
(4) coating of the slurry on the support: and (4) soaking the carrier in the slurry obtained in the step (3) for 2min, then taking out, blowing off redundant slurry on the surface of the carrier and in the pore channel by using compressed air for 2min, then drying in a drying oven at 120 ℃ for 8h, and roasting in a muffle furnace at 550 ℃ for 2h to obtain the catalyst C.
Example 4
A low-temp catalyst for catalytic oxidation treatment of methanol is composed of carrier and coatingThe catalyst carrier is cordierite honeycomb ceramic, the volume is 2.25L, and the pore density is 200 meshes/square foot; the coating is loaded with noble metal Pt and also contains W-Al 2 O 3 And BN, wherein the total coating amount of the coating is 100g/L, and the loading amount of the noble metal Pt is 1.0 g/L.
The preparation method comprises the following steps:
(1) preparation of W-Al by isovolumetric immersion method 2 O 3 : 900g of Al is weighed 2 O 3 Powder and 139g of ammonium tungstate, based on Al 2 O 3 Preparing ammonium tungstate aqueous solution by saturated adsorption amount, and dropwise adding the prepared ammonium tungstate aqueous solution to Al 2 O 3 Stirring for 5h, standing, aging for 12h, drying at 120 deg.C for 12h, and calcining at 550 deg.C in muffle furnace for 2h to obtain W-Al 2 O 3 Wherein W and Al 2 O 3 The mass ratio of (A) to (B) is 1: 9.
(2) Preparation of coating slurry: weighing 1200g of deionized water, and sequentially adding W-Al 2 O 3 380g of BN 380g, uniformly stirring to form coating slurry, and ball-milling the slurry until the granularity of the slurry is D 90 The resulting slurry was continuously stirred at 15 μm to obtain a coating slurry in which W-Al was present 2 O 3 The mass ratio of the BN to the BN is 1: 1;
(3) loading of noble metal: weighing a platinum nitrate solution containing 8.0g of pure Pt, adding 24g of tartaric acid into the platinum nitrate solution, stirring for 1h, dropwise adding the solution into the coating slurry, stirring for 2h, then adding 400g of alumina sol (with the content of cured substances being 10%), and continuously stirring for more than 2 h;
(4) coating of the slurry on the support: and (4) soaking the carrier in the slurry obtained in the step (3) for 2min, then taking out, blowing off redundant slurry on the surface of the carrier and in the pore channel by using compressed air for 2min, then drying in a drying oven at 120 ℃ for 8h, and roasting in a muffle furnace at 550 ℃ for 2h to obtain the catalyst D.
Comparative example 1
The low temperature catalyst for catalytic oxidation treatment of methanol comprises a carrier and a coating coated on the carrier, wherein the catalyst carrier is cordierite honeycomb ceramic, the volume is 2.25L, and the pore density is 200 meshes/flatSquare feet; the coating is loaded with noble metal Pt and also contains W-Al 2 O 3 The total coating amount of the coating is 100g/L, and the loading amount of the noble metal Pt is 1.0 g/L.
The preparation method comprises the following steps:
(1) preparation of W-Al by isovolumetric immersion method 2 O 3 : 900g of Al is weighed 2 O 3 Powder and 139g of ammonium tungstate, based on Al 2 O 3 Preparing ammonium tungstate aqueous solution by saturated adsorption amount, and dropwise adding the prepared ammonium tungstate aqueous solution to Al 2 O 3 Stirring for 5h, standing, aging for 12h, drying at 120 deg.C for 12h, and calcining at 550 deg.C in muffle furnace for 2h to obtain W-Al 2 O 3 Wherein W and Al 2 O 3 The mass ratio of (A) to (B) is 1: 9.
(2) Preparation of coating slurry: weighing 1200g of deionized water, and sequentially adding W-Al 2 O 3 760g, stirring uniformly to form coating slurry, and ball-milling the slurry until the granularity D of the slurry is achieved 90 The particle size is 15 mu m, and the obtained slurry is continuously stirred to obtain coating slurry;
(3) loading of noble metal: weighing a platinum nitrate solution containing 8.0g of pure Pt, adding 24g of tartaric acid into the platinum nitrate solution, stirring for 1h, dropwise adding the solution into the coating slurry, stirring for 2h, then adding 400g of alumina sol (with the content of cured substances being 10%), and continuously stirring for more than 2 h;
(4) coating of the slurry on the support: and (4) soaking the carrier in the slurry obtained in the step (3) for 2min, then taking out, blowing off redundant slurry on the surface of the carrier and in the pore channel by using compressed air for 2min, then drying in a drying oven at 120 ℃ for 8h, and roasting in a muffle furnace at 550 ℃ for 2h to obtain the catalyst E.
Comparative example 2
A low-temperature catalyst for treating methanol by catalytic oxidation comprises a carrier and a coating coated on the carrier, wherein the catalyst carrier is cordierite honeycomb ceramic, the volume is 2.25L, and the pore density is 200 meshes/square foot; the coating is loaded with noble metal Pt and also contains active alumina, the total coating amount of the coating is 100g/L, and the loading amount of the noble metal Pt is 1.0 g/L.
The preparation method comprises the following steps:
(1) preparation of coating slurry: weighing 1200g of deionized water, and sequentially adding active Al 2 O 3 760g, stirring uniformly to form coating slurry, and ball-milling the slurry until the granularity D of the slurry is achieved 90 The particle size is 15 mu m, and the obtained slurry is continuously stirred to obtain coating slurry;
(2) loading of noble metal: weighing a platinum nitrate solution containing 8.0g of pure Pt, adding 24g of tartaric acid into the platinum nitrate solution, stirring for 1h, dropwise adding the solution into the coating slurry, stirring for 2h, then adding 400g of alumina sol (with the content of cured substances being 10%), and continuously stirring for more than 2 h;
(3) coating of the slurry on the support: and (4) soaking the carrier in the slurry obtained in the step (3) for 2min, then taking out, blowing off redundant slurry on the surface of the carrier and in the pore channel by using compressed air for 2min, then drying in a drying oven at 120 ℃ for 8h, and roasting in a muffle furnace at 550 ℃ for 2h to obtain the catalyst F.
Comparative example 1 differs from example 1 in that: no BN was added in comparative example 1; comparative example 2 differs from example 1 in that: comparative example 2W-Al in coating 2 O 3 And replacement of BN with active Al 2 O 3 。
The performance evaluation was performed on the catalyst samples a to F prepared in examples 1 to 4 and comparative examples 1 to 2: the prepared catalysts A-F were subjected to activity evaluation of catalytic oxidation of methanol under the following test conditions: 1000ppm methanol, 4% O 2 ，10％H 2 O, using N as balance gas 2 The reaction temperature is 40-200 ℃, and the space velocity is 20000h -1 . And T of the catalyst sample was thus obtained 50 And T of the catalyst sample 100 The results are shown in Table 1.
TABLE 1T of catalyst samples of examples 1-4 and comparative examples 1-2 50 、T 100 Comparison
As can be seen from Table 1, T of catalysts A to D prepared in examples 1 to 4 50 And T 100 Both lower than catalysts E and F prepared in comparative examples 1-2, and T 50 Is the reaction temperature, T, at which the conversion of the contaminants reaches 50% 50 Lower indicates better light-off activity of the catalyst, T 100 Is the reaction temperature, T, at which the conversion of the contaminants reaches 100% 100 Lower indicates higher conversion efficiency of the catalyst. In conclusion, the finished catalyst prepared by the preparation method disclosed by the invention has better light-off activity and conversion efficiency than the catalyst prepared by the comparative example.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the principles of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (8)
1. The low-temperature catalyst for treating methanol by catalytic oxidation comprises a carrier and a coating coated on the carrier, and is characterized in that the coating amount of the coating is 60-180g/L, the coating contains noble metal Pt, the loading amount of the noble metal Pt is 0.1-3.0 g/L, and the coating further comprises a tungsten-aluminum composite oxide W-Al 2 O 3 And boron nitride BN;
the preparation method of the catalyst comprises the following steps:
(1) preparation of W-Al by isovolumetric immersion method 2 O 3 : weighing ammonium tungstate and activated alumina powder, preparing an ammonium tungstate aqueous solution according to the saturated adsorption capacity of alumina, dropwise adding the prepared ammonium tungstate aqueous solution into the alumina, continuously stirring for 3-10 h, standing and aging for 8-24 h, drying at 100-160 ℃, and finally roasting at 400-600 ℃ for 2-4 h to obtain W-Al 2 O 3 Compounding powder;
(2) preparation of coating slurry: the required amount of W-Al 2 O 3 Adding the composite powder and BN powder into deionized water, and stirring to form slurryThen adopting ball-milling process to treat slurry and controlling granules D of slurry 90 8-20 μm to obtain coating slurry;
(3) loading of noble metal: calculating and weighing the amount of the precious metal Pt, wherein the loading amount of the precious metal Pt is 0.1-3.0 g/L, adding a competitive adsorbent into the weighed precursor solution of the precious metal Pt, uniformly stirring, then adding into the coating slurry obtained in the step (2), and stirring for more than 2 hours until the slurry is uniform;
(4) coating a carrier: soaking the carrier in the slurry prepared in the step (3) for 1-5 min, taking out, blowing through a channel in the carrier for 0.5-3 min, drying the carrier at 100-150 ℃ for 5-12 h, and finally roasting the carrier at 400-550 ℃ for 1-3 h to obtain the finished catalyst.
2. The low temperature catalyst for catalytic oxidation treatment of methanol according to claim 1, wherein W-Al in the coating layer 2 O 3 The mass ratio of BN to BN is 1: 1-9: 1.
3. The low temperature catalyst for catalytic oxidation treatment of methanol according to claim 1, wherein the W-Al is selected from the group consisting of 2 O 3 Middle W and Al 2 O 3 The mass ratio of (A) to (B) is 1: 9-1: 49.
4. The low temperature catalyst for catalytic oxidation treatment of methanol according to claim 1, wherein the carrier is a cordierite honeycomb ceramic carrier or an iron-chromium-aluminum metal honeycomb carrier.
5. The method for preparing a low-temperature catalyst for catalytic oxidation treatment of methanol according to claim 1, comprising the steps of:
(1) preparation of W-Al by isovolumetric immersion method 2 O 3 : weighing ammonium tungstate and activated alumina powder, preparing an ammonium tungstate aqueous solution according to the saturated adsorption capacity of alumina, dropwise adding the prepared ammonium tungstate aqueous solution into the alumina, and continuously stirring for 3-10 hThen standing and aging for 8-24 h, drying at 100-160 ℃, and finally roasting at 400-600 ℃ for 2-4 h to obtain W-Al 2 O 3 Compounding powder;
(2) preparation of coating slurry: the required amount of W-Al 2 O 3 Adding the composite powder and BN powder into deionized water, stirring to form slurry, treating the slurry by adopting a ball milling process, and controlling the particles D of the slurry 90 8-20 μm to obtain coating slurry;
(3) loading of noble metal: calculating and weighing the amount of the precious metal Pt, wherein the loading amount of the precious metal Pt is 0.1-3.0 g/L, adding a competitive adsorbent into the weighed precursor solution of the precious metal Pt, uniformly stirring, then adding into the coating slurry obtained in the step (2), and stirring for more than 2 hours until the slurry is uniform;
(4) coating a carrier: soaking the carrier in the slurry prepared in the step (3) for 1-5 min, taking out, blowing through a channel in the carrier for 0.5-3 min, drying the carrier at 100-150 ℃ for 5-12 h, and finally roasting the carrier at 400-550 ℃ for 1-3 h to obtain the finished catalyst.
6. The method for preparing a low-temperature catalyst for catalytic oxidation treatment of methanol according to claim 5, wherein W-Al in the coating slurry in the step (2) 2 O 3 And the mass ratio of the total mass of the BN to the deionized water is 2: 7-2: 3.
7. The method for preparing a low-temperature catalyst for catalytic oxidation treatment of methanol according to claim 5, wherein the competitive adsorbent in the step (3) is one or more combinations of polycarboxylic acids.
8. The method for preparing a low-temperature catalyst for catalytic oxidation treatment of methanol according to claim 5, wherein the competitive adsorbent in the step (3) is one or more of tartaric acid, oxalic acid and malic acid.
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