A supported noble metal catalyst, its preparation method and application
By designing a supported noble metal catalyst, the sulfur and water resistance of the platinum catalyst was enhanced by using cordierite support and active additives, which solved the problem of easy deactivation of noble metal catalysts in the prior art and realized low-temperature and high-efficiency CO catalytic oxidation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUAQIAO UNIVERSITY
- Filing Date
- 2026-02-12
- Publication Date
- 2026-05-26
AI Technical Summary
Existing precious metal catalysts are prone to deactivation under high humidity and high sulfur environments, which leads to a decrease in CO catalytic oxidation efficiency and makes it difficult to effectively remove CO from industrial kiln flue gas.
Supported noble metal catalysts are used, with cordierite support and binder to bind platinum catalysts. TiO2 or CeO2 support and active promoters (such as tungsten oxide, molybdenum oxide, vanadium oxide) are combined to enhance the catalyst’s resistance to sulfur and water. The interaction between the active promoter and the active component Pt is also used to improve the CO catalytic oxidation capacity.
It achieves efficient catalytic oxidation of CO under low-temperature conditions, significantly improves the stability and sulfur resistance of the catalyst, avoids catalyst deactivation, and is suitable for industrial flue gas environments with high humidity and high sulfur.
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Figure CN122076431A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of industrial flue gas catalytic purification technology, specifically relating to a supported noble metal catalyst, its preparation method, and its application. Background Technology
[0002] With the development of modern industry, industrial waste gas and vehicle exhaust have become major sources of air pollution, with CO being the most abundant component in these gases. Under the current context of carbon emission control, industrial kiln flue gas emits a huge amount of CO. In particular, the sintering process in the steel industry is the largest source of CO emissions (accounting for over 70% of steel plant CO emissions), and breakthroughs in efficient emission reduction technologies are needed.
[0003] The commonly used method for removing CO from industrial kiln flue gas in existing technologies is catalytic oxidation. Common catalysts for CO oxidation are divided into two categories: noble metals (such as Pt, Pd, and Rh) and non-noble metals (such as CuO, MnO2, Co3O4, and NiO). However, in actual operating conditions where traditional platinum catalysts remove CO, there are large amounts of water vapor and SO2. SO2 interacts with the active sites of the platinum catalyst and reacts with H2O and the support to form sulfates, which continuously deposit on the catalyst surface, hindering the interaction between components. Furthermore, these sulfates are difficult to remove, thus inhibiting CO adsorption and resulting in the defect of easy catalyst deactivation. Summary of the Invention
[0004] The purpose of this invention is to provide a supported noble metal catalyst, its preparation method and application. The supported noble metal catalyst provided by this invention has excellent sulfur and water resistance properties, the platinum catalyst is not easily deactivated and has high catalytic efficiency.
[0005] To achieve the objectives of this invention, the following technical solutions are provided: A supported noble metal catalyst includes a cordierite support and a platinum catalyst bonded to the surface and pores of the cordierite support by a binder. The platinum catalyst includes a support and an active component and an active agent supported on the surface of the support; the active component is elemental Pt and Pt oxide; the support is a TiO2 support or a CeO2 support; and the active agent is one or more of tungsten oxide, molybdenum oxide, and vanadium oxide.
[0006] Preferably, the TiO2 support is anatase TiO2 support.
[0007] Preferably, the mass ratio of the platinum catalyst to the cordierite support is 0.10 to 0.39:1.
[0008] Preferably, the platinum catalyst contains 0.05 to 1.0 wt.% of the active component and 2 to 5 wt.% of the active additive.
[0009] Preferably, the adhesive comprises one or more of organic polymer adhesives, organic nonionic adhesives, and inorganic sol-gel adhesives.
[0010] Preferably, the organic polymer binder is one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, and polyvinyl alcohol; The organic nonionic binder is triethanolamine and / or Tween; The inorganic sol binder is aluminum sol and / or silica sol.
[0011] Preferably, the mass of the binder is 2 to 15 wt.% of the mass of the platinum catalyst.
[0012] This invention also provides a method for preparing the supported noble metal catalyst described in the above technical solution, comprising the following steps: The cordierite support was impregnated in a platinum catalyst dispersion, and then dried and calcined sequentially to obtain the supported noble metal catalyst. The platinum catalyst dispersion comprises a platinum catalyst, a binder, an inorganic acid, and water.
[0013] Preferably, the calcination temperature is 300~450℃ and the calcination time is 3~5h.
[0014] The present invention also provides the application of the supported noble metal catalyst described in the above technical solution or the supported noble metal catalyst prepared by the preparation method described in the above technical solution in the control of CO emissions in industrial source flue gas.
[0015] This invention provides a supported noble metal catalyst, comprising a cordierite support and a platinum catalyst bonded to the surface and pores of the cordierite support by a binder. The platinum catalyst includes a support and an active component and an active agent supported on the surface of the support. The active component is elemental Pt and Pt oxides. The support is a TiO2 support or a CeO2 support. The active agent is one or more of tungsten oxide, molybdenum oxide, and vanadium oxide. This invention uses cordierite ceramic honeycomb as the support, which has a water absorption rate ≥40%, allowing for better fixation of the active component without detachment. The active agents tungsten oxide, molybdenum oxide, and vanadium oxide are strongly acidic substances with acidic sites, especially Bronst acid sites, which enhance the acidity of the catalyst. These acidic sites repel SO2 from contacting the catalyst surface, thereby improving SO2 resistance. Simultaneously, the active agents allow for a dynamic equilibrium between the formation and decomposition of sulfites on the catalyst surface, achieving good sulfur resistance. Furthermore, there is a strong interaction between the active additive and the active component Pt, which accelerates the charge transfer ability of Pt, improves the catalytic oxidation capacity of CO, and promotes the shift of CO oxidation temperature to the low-temperature region, achieving low-temperature catalysis. The platinum catalyst of this invention also includes a binder, which enhances the adhesion between the cordierite support and the platinum catalyst, while also making the platinum catalyst coating less prone to detachment, thus achieving efficient and stable operation of the platinum catalyst and further preventing catalyst deactivation. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 The graph shows the test results of the supported noble metal catalysts described in Example 1 and Comparative Example 1 of this invention for the catalytic oxidation of CO under conditions containing SO2 and H2O. Figure 2 The graph shows the test results of the supported noble metal catalysts described in Example 1 and Comparative Example 1 of this invention on the CO oxidation performance under H2O conditions. Detailed Implementation
[0018] The present invention provides a supported noble metal catalyst, comprising a cordierite support and a platinum catalyst bonded to the surface and pores of the cordierite support by a binder; The platinum catalyst includes a support and an active component and an active agent supported on the surface of the support; the active component is elemental Pt and Pt oxide; the support is a TiO2 support or a CeO2 support; and the active agent is one or more of tungsten oxide, molybdenum oxide, and vanadium oxide.
[0019] In this invention, the active additives tungsten oxide, molybdenum oxide, and vanadium oxide are strongly acidic substances with their own acidic sites, especially the Bronst acid sites, which enhance the acidity of the catalyst. These acidic sites repel the contact of acidic SO2 with the catalyst surface, thereby improving SO2 resistance. Simultaneously, the active additives also allow the formation and decomposition of sulfites on the catalyst surface to reach a dynamic equilibrium, achieving good sulfur resistance. Furthermore, there is a strong interaction between the active additives and the active component Pt, accelerating Pt's charge transfer ability, improving its catalytic oxidation capacity for CO, and shifting the CO oxidation temperature to a lower temperature range, achieving low-temperature catalysis.
[0020] In this invention, unless otherwise specified, all raw materials used in the preparation are commercially available products well known to those skilled in the art.
[0021] In this invention, the cordierite carrier is specifically a cordierite ceramic honeycomb with a water absorption rate of ≥40%, which can be 40~60% in specific embodiments.
[0022] In this invention, the mass ratio of the platinum catalyst to the cordierite support is 0.10~0.39:1, and in specific embodiments, it is 0.13:1, 0.15:1, 0.18:1, 0.21:1, 0.25:1, 0.29:1, 0.31:1 or 0.35:1.
[0023] In this invention, the TiO2 support is anatase TiO2 support.
[0024] In this invention, the active component in the platinum catalyst has a mass content of 0.05~1.0 wt.%, and in specific embodiments it can be 0.08 wt.%, 0.15 wt.%, 0.2 wt.%, 0.5 wt.% or 0.7 wt.%; the active additive has a mass content of 2~5 wt.%, and in specific embodiments it can be 2.5 wt.%, 3.5 wt.% or 4.5 wt.%.
[0025] In this invention, the binder accounts for 2 to 8 wt.% of the mass of the platinum catalyst, and in specific embodiments it can be 2.5 wt.%, 3 wt.%, 4 wt.%, 5.5 wt.%, or 6.5 wt.%.
[0026] In this invention, the binder includes an organic polymer binder, an organic nonionic binder, and / or an inorganic sol binder; the organic polymer binder is one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, and polyvinyl alcohol; the organic nonionic binder is triethanolamine and / or Tween; and the inorganic sol binder is aluminum sol and / or silica sol. In a specific embodiment, the binder can be sodium carboxymethyl cellulose and Tween; the mass ratio of sodium carboxymethyl cellulose to Tween is 1:15~25, and in a specific embodiment, it can be 1:20. This invention enhances the adhesion between the cordierite support and the platinum catalyst through the use of a binder, while also making the platinum catalyst coating less prone to detachment, achieving efficient and stable operation of the platinum catalyst, and further preventing catalyst deactivation.
[0027] This invention also provides a method for preparing the supported noble metal catalyst described in the above technical solution, comprising the following steps: The cordierite support was impregnated in a platinum catalyst dispersion, and then dried and calcined sequentially to obtain the supported noble metal catalyst; the platinum catalyst dispersion included a platinum catalyst, a binder, an inorganic acid, and water.
[0028] In this invention, the preparation method of the platinum catalyst includes the following steps: The platinum catalyst is obtained by dispersing TiO2 support or CeO2 support, active agent precursor, active component precursor and water, and then drying and calcining them in sequence.
[0029] In this invention, the active component precursor includes one or more of chloroplatinic acid, platinum nitrate, platinum carbonate, platinum acetylacetonate, and ethylenediamine platinum; the active auxiliary agent precursor includes at least one of a molybdenum precursor, a tungsten precursor, and a vanadium precursor; the molybdenum precursor includes one or more of ammonium heptamolybdate, ammonium molybdate, molybdenum nitrate, and molybdenum sulfate; the tungsten precursor includes at least one of ammonium metatungstate, ammonium paratungstate, ammonium tungstate, and tungsten nitrate; and the vanadium precursor includes one or more of ammonium metavanadate, vanadium oxalate, and vanadium pentoxide.
[0030] In this invention, the mass ratio of TiO2 support or CeO2 support, active component precursor, and active auxiliary agent precursor is 1000:1~3:25~40, and in a specific embodiment it can be 1000:3:37.
[0031] In this invention, the drying temperature in the preparation method of the platinum catalyst is 80~150℃, and in a specific embodiment it can be 100 or 120℃, and the time is 10~12h; the calcination temperature is 300~550℃, and in a specific embodiment it can be 350 or 400℃, and the calcination time is 3~5h.
[0032] The cordierite described in this invention also includes washing and drying before use; the washing is carried out under ultrasonic conditions; this invention does not have any special limitations on drying.
[0033] In this invention, the inorganic acid includes hydrochloric acid, sulfuric acid, or nitric acid; the inorganic acid in this invention acts as a pH adjuster to adjust the pH of the platinum catalyst dispersion to 1-3; by controlling the pH of the platinum catalyst dispersion to be acidic, this invention ensures activity while further ensuring the adhesion between the active components, active additives, and the carrier.
[0034] In this invention, the drying temperature in the preparation method of the supported noble metal catalyst is 40~60℃ and the time is 8~10h; the sintering temperature is 300~450℃ and the holding time is 3~5h.
[0035] The present invention also provides the application of the supported noble metal catalyst described in the above technical solution or the supported noble metal catalyst prepared by the preparation method described in the above technical solution in the control of CO emissions in industrial source flue gas.
[0036] In this invention, the CO in the industrial flue gas originates from steel, oil refining, chemical or coking processes.
[0037] In this invention, the concentration of CO in the industrial source flue gas is 2000~20000ppm, and in specific embodiments it can be 5000, 7000, 8000 or 10000ppm; the concentration of SO2 in the industrial source flue gas is preferably 0~1000ppm, and in specific embodiments it can be 35, 100, 200, 300 or 500ppm; the content of H2O in the industrial source flue gas is 2~20 vol.%, and in specific embodiments it can be 5, 10, 12, 15 or 18 vol.%; the content of O2 in the industrial source flue gas is 3~18 vol.%, and in specific embodiments it can be 5, 8, 10, 12 or 16 vol.%.
[0038] In this invention, the platinum catalyst is used for CO emission control in industrial flue gas at 150~300℃, and in specific embodiments, the temperature can be 160, 180, 200, 220℃ or 250℃.
[0039] To further illustrate the present invention, the supported noble metal catalysts, their preparation methods, and applications provided by the present invention will be described in detail below with reference to the accompanying drawings and embodiments, but these should not be construed as limiting the scope of protection of the present invention.
[0040] Example 1 Titanium dioxide, chloroplatinic acid, ammonium heptamolybdate and distilled water were mixed and stirred for 30 min according to a mass ratio of 365:1:14:20, dried in an oven at 110℃ for 12 h, and calcined in a muffle furnace at 400℃ for 4 h to obtain a platinum catalyst. Weigh 1045g of the above platinum catalyst and 3.5L of distilled water and stir to obtain a mixed slurry; add 0.025wt% sodium carboxymethyl cellulose to the obtained slurry, stir for 10min, then add 0.5wt% Tween to the obtained slurry, stir for 2h to obtain a platinum catalyst dispersion. Pretreated cordierite was obtained by washing and ultrasonically vibrating the cordierite ceramic honeycomb body with water and then drying it. Immerse the pretreated cordierite in the above platinum catalyst dispersion for 3-5 seconds, remove the cordierite, and blow out the excess platinum catalyst dispersion from the pores with compressed air. Repeat the above steps twice to ensure complete coating. Cordierite coated with platinum catalyst dispersion was air-dried at room temperature for 12 hours, then dried in an oven at 30°C for 10 hours, and finally calcined at 400°C for 4 hours to obtain a supported noble metal catalyst.
[0041] The final honeycomb catalyst had a loading rate of 20.11%, exhibited minimal impact-induced shedding, uniform coating within the pores, and excellent loading performance.
[0042] Example 2 Titanium dioxide, chloroplatinic acid, ammonium paratungstate and distilled water were mixed and stirred for 30 min according to a mass ratio of 365.4:1:13.9:20, dried in an oven at 110℃ for 12 h, and calcined in a muffle furnace at 400℃ for 4 h to obtain a platinum catalyst. Weigh 1045g of the above platinum catalyst and 3.5L of distilled water and stir to obtain a mixed slurry; add 0.15wt% sodium carboxymethyl cellulose to the obtained slurry, stir for 10min, then add 0.5wt% Tween to the obtained slurry, stir for 1h to obtain a platinum catalyst dispersion. Pretreated cordierite was obtained by washing and ultrasonically vibrating the cordierite ceramic honeycomb body with water and then drying it. Immerse the pretreated cordierite in the above platinum catalyst dispersion for 3-5 seconds, remove the cordierite, and blow out the platinum catalyst dispersion from the pores with compressed air. Repeat the above steps twice to ensure complete coating. Cordierite coated with platinum catalyst dispersion was air-dried at room temperature for 12 hours, then dried in an oven at 30°C for 10 hours, and finally calcined at 400°C for 4 hours to obtain a supported noble metal catalyst.
[0043] Example 3 Titanium dioxide, chloroplatinic acid, ammonium metatungstate and distilled water were mixed and stirred for 30 min according to a mass ratio of 365:1:14:20, dried in an oven at 110℃ for 12 h, and calcined in a muffle furnace at 400℃ for 4 h to obtain a platinum catalyst. Weigh 1045g of the above platinum catalyst and 3.5L of distilled water and stir to obtain a mixed slurry; add 0.3wt.% sodium carboxymethyl cellulose to the obtained slurry, stir for 5min, then add 5.0wt.% aluminum sol to the obtained slurry, stir for 10min, then add 0.2% Tween to the obtained slurry, stir for 1h to obtain a platinum catalyst dispersion; Pretreated cordierite was obtained by washing and ultrasonically vibrating the cordierite ceramic honeycomb body with water and then drying it. Immerse the pretreated cordierite in the above platinum catalyst dispersion for 3-5 seconds, remove the cordierite, and blow out the platinum catalyst dispersion from the pores with compressed air. Repeat the above steps twice to ensure complete coating. Cordierite coated with platinum catalyst dispersion was air-dried at room temperature for 12 hours, then dried in an oven at 30°C for 10 hours, and finally calcined at 400°C for 4 hours to obtain a supported noble metal catalyst.
[0044] Example 4 Cerium dioxide, chloroplatinic acid, ammonium metavanadate and distilled water were mixed and stirred for 30 min according to a mass ratio of 365:1:14:20, dried in an oven at 110℃ for 12 h, and calcined in a muffle furnace at 400℃ for 4 h to obtain a platinum catalyst. Weigh 1045g of the above platinum catalyst and 3.5L of distilled water and stir to obtain a mixed slurry; add 0.023wt% of carboxymethyl cellulose to the obtained slurry, stir for 10min, then add 0.5wt% of Tween to the obtained slurry, stir for 2h to obtain a platinum catalyst dispersion. Pretreated cordierite was obtained by washing and ultrasonically vibrating the cordierite ceramic honeycomb body with water and then drying it. Immerse the pretreated cordierite in the above platinum catalyst dispersion for 3-5 seconds, remove the cordierite, and blow out the platinum catalyst dispersion from the pores with compressed air. Repeat the above steps twice to ensure complete coating. Cordierite coated with platinum catalyst dispersion was air-dried at room temperature for 12 hours, then dried in an oven at 30°C for 10 hours, and finally calcined at 400°C for 4 hours to obtain a supported noble metal catalyst.
[0045] Example 5 Cerium dioxide, chloroplatinic acid, ammonium heptamolybdate and distilled water were mixed and stirred for 30 min according to a mass ratio of 365:1:14:20, dried in an oven at 110℃ for 12 h, and calcined in a muffle furnace at 400℃ for 4 h to obtain a platinum catalyst. Weigh 1045g of the above platinum catalyst and 3.5L of distilled water and stir to obtain a mixed slurry; add 0.023wt% of carboxymethyl cellulose to the obtained slurry, stir for 10min, then add 0.125wt% of Tween to the obtained slurry, stir for 2h to obtain a platinum catalyst dispersion. Pretreated cordierite was obtained by washing and ultrasonically vibrating the cordierite ceramic honeycomb body with water and then drying it. Immerse the pretreated cordierite in the above platinum catalyst dispersion for 3-5 seconds, remove the cordierite, and blow out the platinum catalyst dispersion from the pores with compressed air. Repeat the above steps twice to ensure complete coating. Cordierite coated with platinum catalyst dispersion was air-dried at room temperature for 12 hours, then dried in an oven at 30°C for 10 hours, and finally calcined at 400°C for 4 hours to obtain a supported noble metal catalyst.
[0046] Example 6 Titanium dioxide, chloroplatinic acid, ammonium heptamolybdate and distilled water were mixed and stirred for 30 min according to a mass ratio of 365:1:14:20, dried in an oven at 110℃ for 12 h, and calcined in a muffle furnace at 400℃ for 4 h to obtain a platinum catalyst. Weigh 1045g of the above platinum catalyst and 3.5L of distilled water and stir to obtain a mixed slurry; add sodium carboxymethyl cellulose at 0.023wt% of the obtained slurry, stir for 10min, then add Tween at 0.125wt% of the obtained slurry, stir for 2h to obtain a platinum catalyst dispersion. Pretreated cordierite was obtained by washing and ultrasonically vibrating the cordierite ceramic honeycomb body with water and then drying it. Immerse the pretreated cordierite in the above platinum catalyst dispersion for 3-5 seconds, remove the cordierite, and blow out the platinum catalyst dispersion from the pores with compressed air. Repeat the above steps twice to ensure complete coating. Cordierite coated with platinum catalyst dispersion was air-dried at room temperature for 12 hours, then dried in an oven at 30°C for 10 hours, and finally calcined at 400°C for 4 hours to obtain a supported noble metal catalyst.
[0047] Comparative Example 1 Titanium dioxide, chloroplatinic acid and distilled water were mixed and stirred for 30 min at a mass ratio of 365:1:20, dried in an oven at 110℃ for 12 h, and then calcined in a muffle furnace at 400℃ for 4 h to obtain a platinum catalyst. Weigh 1045g of the above platinum catalyst and 3.5L of distilled water and stir to obtain a mixed slurry; add 0.025wt% sodium carboxymethyl cellulose to the obtained slurry, stir for 10min, then add 0.5wt% Tween to the obtained slurry, stir for 2h to obtain a platinum catalyst dispersion. Pretreated cordierite was obtained by washing and ultrasonically vibrating the cordierite ceramic honeycomb body with water and then drying it. Immerse the pretreated cordierite in the above platinum catalyst dispersion for 3-5 seconds, remove the cordierite, and blow out the platinum catalyst dispersion from the pores with compressed air. Repeat the above steps twice to ensure complete coating. Cordierite coated with platinum catalyst dispersion was air-dried at room temperature for 12 hours, then dried in an oven at 30°C for 10 hours, and finally calcined at 400°C for 4 hours to obtain a supported noble metal catalyst.
[0048] Test case The CO catalytic oxidation performance of the supported noble metal catalysts obtained in Example 1 and Comparative Example 1 was tested. The water resistance test conditions were: 220℃, 7000 ppm CO, 10 vol.% O2, 15 vol.% H2O, and N2 as the balance gas, with a space velocity (GHSV) of 60000 h⁻¹. -1 The measurement was performed using gas chromatography. The sulfur resistance test conditions were: 220℃, 7000 ppm CO, 200 ppm SO2, 10 vol.% O2, 15 vol.% H2O, and N2 as the balance gas, with a space velocity (GHSV) of 60000 h⁻¹. -1 The measurement was performed using gas chromatography; the test results are as follows: Figures 1-2 As shown.
[0049] Figure 1 The graph shows the test results of the supported noble metal catalysts described in Example 1 and Comparative Example 1 of this invention for the catalytic oxidation of CO under conditions containing SO2 and H2O. Figure 1 The results show that the CO catalyst prepared by this invention has good resistance to SO2 and H2O at 220℃.
[0050] Figure 2 The graph shows the test results of the supported noble metal catalysts described in Example 1 and Comparative Example 1 of this invention for CO oxidation performance under H2O-containing conditions. Figure 2 The results show that the platinum catalyst prepared in this invention has good CO catalytic oxidation activity at 220℃, with a catalytic efficiency >95%, and good resistance to H2O.
[0051] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.
Claims
1. A supported noble metal catalyst, characterized in that, It includes a cordierite support and a platinum catalyst bonded to the surface and pores of the cordierite support by a binder; The platinum catalyst includes a support and an active component and an active agent supported on the surface of the support; the active component is elemental Pt and Pt oxide; the support is a TiO2 support or a CeO2 support; and the active agent is one or more of tungsten oxide, molybdenum oxide, and vanadium oxide.
2. The supported noble metal catalyst according to claim 1, characterized in that, The TiO2 support is anatase TiO2 support.
3. The supported noble metal catalyst according to claim 1, characterized in that, The mass ratio of the platinum catalyst to the cordierite support is 0.10~0.39:
1.
4. The supported noble metal catalyst according to claim 1, characterized in that, The platinum catalyst contains 0.05 to 1.0 wt.% of the active component and 2 to 5 wt.% of the active additive.
5. The supported noble metal catalyst according to claim 1, characterized in that, The adhesive includes one or more of organic polymer adhesives, organic nonionic adhesives, and inorganic sol-gel adhesives.
6. The supported noble metal catalyst according to claim 5, characterized in that, The organic polymer binder is one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose, and polyvinyl alcohol; The organic nonionic binder is triethanolamine and / or Tween; The inorganic sol binder is aluminum sol and / or silica sol.
7. The supported noble metal catalyst according to claim 5 or 6, characterized in that, The mass of the binder is 2 to 15 wt.% of the mass of the platinum catalyst.
8. A method for preparing the supported noble metal catalyst according to any one of claims 1 to 7, characterized in that, Includes the following steps: The cordierite support was impregnated in a platinum catalyst dispersion, and then dried and calcined sequentially to obtain the supported noble metal catalyst. The platinum catalyst dispersion comprises a platinum catalyst, a binder, an inorganic acid, and water.
9. The preparation method according to claim 8, characterized in that, The roasting temperature is 300~450℃, and the roasting time is 3~5h.
10. The application of the supported noble metal catalyst according to any one of claims 1 to 7 or the supported noble metal catalyst prepared by the preparation method according to claim 8 or 9 in the control of CO emissions from industrial flue gas.