Anti-poisoning CO oxidation catalyst as well as preparation method and application thereof

Abstract

The invention relates to the technical field of catalysts, and provides an anti-poisoning CO oxidation catalyst as well as a preparation method and application thereof. The molecular sieve is used as a carrier, the noble metal is used as an active component, two ion exchange processes of liquid ion exchange and solid ion exchange (roasting) are adopted, the noble metal active component is loaded in a pore channel of the molecular sieve carrier, and the obtained catalyst shows excellent catalytic activity and anti-poisoning tolerance in sintering flue gas CO catalytic oxidation. The prepared catalyst has SO2 resistance, water resistance, HCl resistance and alkali metal poisoning resistance at the same time, is long in service life, high in catalytic activity and high in CO conversion rate, can be applied to treatment of CO in sintering flue gas in the steel industry, can reduce emission of CO, can also utilize the high calorific value characteristic of CO to achieve energy-saving value, and has wide application prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of catalyst technology, in particular to an anti-poisoning CO oxidation catalyst and a preparation method and application thereof. BACKGROUND

[0002] In the steel industry, the sintering flue gas has the problems of high CO content and large emission amount, and it is urgent to develop a high-efficiency purification technology for sintering flue gas CO. Meanwhile, CO has the characteristics of high heat value, which makes it have potential application value. Under normal circumstances, the temperature of flue gas after desulfurization and dust removal is about 90-95℃, which can be raised to 220-250℃ after heat exchange by a GGH heat exchanger, and then heated to 270-300℃ by a hot air machine before the SCR denitrification reaction. Based on this feature, if a CO reactor is set before the SCR denitrification reactor, the heat generated by the catalytic oxidation of CO can replace the blast furnace gas to supply heat for the low-temperature SCR denitrification, thereby realizing energy saving coupling. In summary, the development of sintering flue gas CO catalytic oxidation technology in the steel industry not only helps to solve the CO emission problem, but also realizes the efficient use of energy, and has broad market application prospects.

[0003] The composition of sintering flue gas in the steel industry is complex, and impurities such as SO2, water, HCl and alkali metals will have a poisoning effect on the CO oxidation catalyst, weaken the CO reaction activity, and ultimately lead to a decline in catalyst performance, so it is urgent to develop a high-performance anti-poisoning catalyst for sintering flue gas CO deep purification and removal. In view of the phenomenon of catalyst poisoning and deactivation, related technologies use a microwave-assisted method to expand the hole of the TiO2-SiO2 coating, and load active components Pt in the expanded TiO2-SiO2 coating by impregnation method, and the obtained catalyst has the characteristics of high catalytic oxidation efficiency and significantly improved sulfur resistance. Another related technology uses potassium permanganate, deionized water, concentrated nitric acid and manganese nitrate as raw materials to prepare OMS-2 powder, then adds an alkaline earth metal salt solution to prepare an OMS-2 powder solution, and finally heat-treats the OMS-2 powder solution to obtain an anti-sulfur and anti-water type CO oxidation catalyst. Another related technology uses a titanium dioxide composite carrier doped with selenium element to load noble metal elements, forming a complex Ti-O-Se and Pt(Ag, Pd, Rh, Ru, Cu)-O-Se structure on the surface of the catalyst, which can improve the anti-SO2 and anti-HCl performance of the catalyst.

[0004] However, in the prior art, the research focus is mainly on improving the SO2, water and HCl poisoning resistance of the catalyst, and the research on the resistance of the catalyst to alkali metal (such as sodium and potassium) poisoning is relatively scarce. However, in the actual application of sintering flue gas purification in the steel industry, the effects of SO2, water, HCl and alkali metal in the flue gas on the catalyst need to be considered simultaneously, and the poisoning of alkali metal will also seriously shorten the service life of the catalyst. In summary, it is an urgent problem in the field to provide a CO oxidation catalyst with SO2, water, HCl and alkali metal poisoning resistance. SUMMARY

[0005] Therefore, the application provides an anti-poisoning CO oxidation catalyst, a preparation method and application thereof. The anti-poisoning CO oxidation catalyst provided by the application has SO2, water, HCl and alkali metal poisoning resistance, a long service life, high catalytic activity and high CO conversion rate.

[0006] In order to achieve the above-mentioned application purposes, the application provides the following technical solutions. A preparation method of an anti-poisoning CO oxidation catalyst, comprising the following steps: Mixing a molecular sieve carrier and a noble metal precursor solution to obtain a slurry; the molecular sieve carrier comprises one or more of ZSM-5, SAPO-34 and SSZ-13; the noble metal elements in the noble metal precursor solution comprise one or more of Pt, Pd and Rh; Performing liquid ion exchange on the slurry under a heat treatment condition to obtain an ion exchange product; the temperature of the heat treatment is above 60℃; Roasting the ion exchange product to obtain an anti-poisoning CO oxidation catalyst.

[0007] Preferably, the mass of the noble metal precursor in the noble metal precursor solution is 0.05-1% of the mass of the molecular sieve carrier.

[0008] Preferably, the noble metal precursor solution is obtained by diluting a noble metal precursor mother liquor; the mass ratio of the noble metal precursor solution to the molecular sieve carrier is 2-8:1.

[0009] Preferably, the mixing time is 10-60 min.

[0010] Preferably, the temperature of the heat treatment is 60-100℃, and the time is 6-16 h.

[0011] Preferably, the roasting temperature is 350-550℃, and the time is 1-8 h.

[0012] The application further provides the anti-poisoning CO oxidation catalyst prepared by the preparation method, which comprises a molecular sieve carrier and a noble metal active component supported on the molecular sieve carrier; the molecular sieve carrier comprises one or more of ZSM-5, SAPO-34 and SSZ-13; and the noble metal active component comprises one or more of Pt, Pd and Rh.

[0013] The application further provides application of the anti-poisoning CO oxidation catalyst in catalytic oxidation of CO.

[0014] The application further provides a method for treating CO-containing flue gas, which comprises contacting the anti-poisoning CO oxidation catalyst with the CO-containing flue gas to catalytically oxidize CO in the flue gas.

[0015] The flue gas is sintering flue gas in the steel industry; the volume space velocity of the flue gas and the catalyst is 6000-20000 h-1; and the temperature of the catalytic oxidation is 220-250 DEG C. -1

[0016] The application provides a preparation method of an anti-poisoning CO oxidation catalyst, which comprises the following steps: mixing a molecular sieve carrier and a noble metal precursor solution to obtain slurry; the molecular sieve carrier comprises one or more of ZSM-5, SAPO-34 and SSZ-13; the noble metal element in the noble metal precursor solution comprises one or more of Pt, Pd and Rh; the slurry is subjected to liquid ion exchange under heat treatment conditions to obtain an ion exchange product; the temperature of the heat treatment is higher than 60 DEG C; and the ion exchange product is calcined to obtain the anti-poisoning CO oxidation catalyst. Through the heat treatment, the liquid ion exchange between the noble metal ions and the cations in the molecular sieve is realized, then through the calcination, the solid ion exchange between the residual noble metal precursor on the molecular sieve and the cations in the molecular sieve is realized again, through the two ion exchange processes, the noble metal active component is uniformly supported in the pore channel of the molecular sieve, and the obtained catalyst exhibits excellent catalytic activity and poisoning resistance in the catalytic oxidation of CO; and the molecular sieve has high specific surface area and structural stability, the noble metal active component supported in the pore channel is uniformly dispersed and has small particle size, exhibits high catalytic activity and hydrothermal stability to CO; the pore channel confinement shielding effect and the rich acid sites of the molecular sieve can effectively limit the generation of sulfates and the adsorption of acid gases, so that the catalyst exhibits higher anti-SO2 and anti-HCl poisoning capacity; meanwhile, the molecular sieve can capture alkali metal (K + , Na + and the like) and act as a sacrifice site to relieve the poisoning of the active alkali metal; and the preparation method of the application does not produce waste liquid and waste gas, and is very friendly to the surrounding environment.

[0017] ​In summary, the catalyst prepared by this invention possesses resistance to SO2, water, HCl, and alkali metal poisoning, exhibits a long service life, high catalytic activity, and high CO conversion rate. In a 72-hour test on simulated sintering flue gas components at 240°C, the catalyst maintained high catalytic activity, with a CO conversion rate exceeding 92%. Applying this catalyst to the treatment of CO in sintering flue gas in the steel industry can reduce CO emissions and utilize CO's high calorific value to achieve energy conservation, demonstrating broad application prospects. Attached Figure Description

[0018] Figure 1 The results show the catalytic activity and anti-poisoning performance of the catalysts prepared in Examples 1-6 and Comparative Examples 1-2. Detailed Implementation

[0019] This invention provides a method for preparing an anti-poisoned CO oxidation catalyst, comprising the following steps: A slurry is obtained by mixing a molecular sieve support and a noble metal precursor solution; the molecular sieve support includes one or more of ZSM-5, SAPO-34 and SSZ-13; the noble metal element in the noble metal precursor solution includes one or more of Pt, Pd and Rh. The slurry is subjected to liquid ion exchange under heat treatment conditions to obtain ion exchange products; the heat treatment temperature is above 60°C. The ion exchange product was calcined to obtain an anti-poisoned CO oxidation catalyst.

[0020] This invention involves mixing a molecular sieve support and a noble metal precursor solution to obtain a slurry. In this invention, the molecular sieve support comprises one or more of ZSM-5, SAPO-34, and SSZ-13; the noble metal element in the noble metal precursor solution comprises one or more of Pt, Pd, and Rh; the mass of the noble metal in the noble metal precursor solution is preferably 0.05-1% of the mass of the molecular sieve support, more preferably 0.1-0.5%; the noble metal precursor in the noble metal precursor solution is preferably a noble metal salt or a metal acid, specifically one or more of platinum tetrachloride, chloroplatinic acid, palladium chloride, and rhodium chloride; the noble metal precursor solution is preferably obtained by diluting a noble metal precursor mother liquor; the mass ratio of the noble metal precursor solution to the molecular sieve support is preferably 2-8:1, specifically 5:1. The mixing time is preferably 10-60 min, specifically 30 min, and the mixing is preferably carried out under stirring conditions.

[0021] After obtaining the slurry, the present invention subjectes the slurry to liquid ion exchange under heat treatment conditions to obtain ion exchange products. In the present invention, the heat treatment temperature is above 60°C, specifically 60~100°C, more preferably 80°C, and the time is preferably 6~16 hours, more preferably 8~12 hours. During the heat treatment, noble metal ions in the noble metal precursor and cations in the molecular sieve undergo ion exchange. In a specific embodiment of the present invention, the heat treatment is carried out under sealed conditions to avoid evaporation of the liquid. After the heat treatment is completed, the sealed conditions are preferably removed, and the obtained product liquid is stirred and evaporated to dryness at the heat treatment temperature. The obtained solid is then dried, and the resulting dried powder is subsequently calcined. The drying temperature is preferably 110°C.

[0022] After obtaining the ion exchange product, the present invention calcines the ion exchange product to obtain an anti-poisoning CO oxidation catalyst. In the present invention, the calcination temperature is preferably 350~550℃, more preferably 400~450℃, specifically 450℃; the calcination time is preferably 1~8h, more preferably 2~4h; the calcination can be carried out in an air atmosphere (after calcination, the noble metal exists in the form of oxides); during the calcination process, the noble metal ions remaining on the molecular sieve and the cations in the molecular sieve undergo solid-state ion exchange, simultaneously activating the catalyst, confining the active component within the molecular sieve channels, reducing the loss or migration and aggregation of noble metals during the reaction, and improving the catalytic activity and lifespan of the catalyst.

[0023] The present invention also provides an anti-poisoned CO oxidation catalyst prepared by the preparation method described above, comprising a molecular sieve support and a noble metal active component supported on the molecular sieve support; the molecular sieve support comprises one or more of ZSM-5, SAPO-34 and SSZ-13, and the noble metal active component comprises one or more of Pt, Pd and Rh; the loading of the noble metal active component in the anti-poisoned CO oxidation catalyst is preferably 0.1% to 0.5%.

[0024] The present invention also provides the application of the anti-poisoning CO oxidation catalyst described above in the catalytic oxidation of CO.

[0025] This invention also provides a method for treating CO-containing flue gas, wherein the CO-resistant anti-poisoning catalyst described in the above scheme is contacted with the CO-containing flue gas to catalytically oxidize the CO in the flue gas; the flue gas is sintering flue gas from the iron and steel industry; the composition of the sintering flue gas from the iron and steel industry is complex, and the flue gas contains components such as HCl, SO2, water and alkali metals that can easily poison and deactivate the catalyst; the CO oxidation catalyst provided by this invention has good anti-poisoning performance, long service life, can be used for the catalytic oxidation of CO in sintering flue gas from the iron and steel industry, and has high catalytic activity and high CO conversion rate, exhibiting excellent catalytic effect.

[0026] In this invention, the volume hourly space velocity of the flue gas and the catalyst is preferably 6000~20000 h⁻¹. -1 Specifically, it can be 10000h -1 The preferred temperature for the catalytic oxidation is 220~250℃, specifically 240℃. In a specific embodiment of the present invention, a CO reactor is preferably set up before the SCR denitrification reactor, using the catalyst of the present invention to catalytically oxidize CO in the flue gas, while simultaneously using the exothermic reaction of CO catalytic oxidation to provide supplemental heat for medium- and low-temperature SCR denitrification, thereby achieving coupled energy saving.

[0027] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] Example 1 A 0.1% Pt-ZSM-5 CO oxidation catalyst was prepared by the following steps: 30g of ZSM-5 molecular sieve was weighed, and 15mL of a mother liquor of platinum tetrachloride with a t content of 2g / L was weighed. Deionized water was added to bring the total volume to 150g. The molecular sieve was added to the diluted platinum tetrachloride aqueous solution and stirred thoroughly for 30min. The slurry was then sealed with plastic wrap and transferred to an oil bath at 80℃ and stirred for 12h. After the reaction was completed, the plastic wrap was removed, and the mixture was stirred in the reactor at 80℃ until the solution evaporated to dryness. The residue was dried in an oven at 110℃. The dried powder was calcined in a muffle furnace at 450℃ for 2h to obtain the 0.1% Pt-ZSM-5 catalyst.

[0029] Example 2 A 0.5% Pt-ZSM-5 CO oxidation catalyst was prepared by the following steps: 30g of ZSM-5 molecular sieve was weighed, and 75mL of platinum tetrachloride mother liquor with a Pt content of 2g / L was measured. Deionized water was added to bring the total volume to 150g. The molecular sieve was added to the diluted platinum tetrachloride aqueous solution and stirred thoroughly for 30min. The slurry was then sealed with plastic wrap and transferred to an oil bath at 80℃ and stirred for 12h. After the reaction was completed, the plastic wrap was removed, and the mixture was stirred in the reactor at 80℃ until the solution was evaporated to dryness. The residue was dried in an oven at 110℃. The dried powder was then calcined in a muffle furnace at 450℃ for 2h to obtain the 0.5% Pt-ZSM-5 catalyst.

[0030] Example 3 A 0.1% Pd-ZSM-5 CO oxidation catalyst was prepared by the following steps: 30g of ZSM-5 molecular sieve was weighed, and 15mL of palladium chloride mother liquor with a Pd content of 2g / L was weighed. Deionized water was added to bring the total volume to 150g. The molecular sieve was added to the diluted palladium chloride aqueous solution and stirred thoroughly for 30min. The slurry was then sealed with plastic wrap and transferred to an oil bath at 80℃ and stirred for 12h. After the reaction was completed, the plastic wrap was removed, and the mixture was stirred in the reactor at 80℃ until the solution was evaporated to dryness. The residue was dried in an oven at 110℃. The dried powder was calcined in a muffle furnace at 450℃ for 2h to obtain the 0.1% Pd-ZSM-5 catalyst.

[0031] Example 4 A 0.1%Rh-ZSM-5 CO oxidation catalyst was prepared by the following steps: 30g of ZSM-5 molecular sieve was weighed, and 15ml of rhodium chloride mother liquor with a rh content of 2g / L was weighed. Deionized water was added to bring the total volume to 150g. The molecular sieve was added to the diluted palladium chloride aqueous solution and stirred thoroughly for 30min. The slurry was then sealed with plastic wrap and transferred to an oil bath at 80℃ and stirred for 12h. After the reaction was completed, the mixture was stirred in the reactor at 80℃ until the solution was evaporated to dryness. The residue was dried in an oven at 110℃. The dried powder was calcined in a muffle furnace at 450℃ for 2h to obtain the 0.1%Rh-ZSM-5 catalyst.

[0032] Example 5 A 0.1% Pt-SAPO-34 CO oxidation catalyst was prepared by the following steps: 30g of SAPO-34 molecular sieve was weighed, and 15mL of a mother liquor of platinum tetrachloride with a Pt content of 2g / L was weighed. Deionized water was added to bring the total volume to 150g. The molecular sieve was added to the diluted platinum tetrachloride aqueous solution and stirred thoroughly for 30min. The slurry was then sealed with plastic wrap and transferred to an oil bath at 80℃ and stirred for 12h. After the reaction was completed, the plastic wrap was removed, and the mixture was stirred in the reactor at 80℃ until the solution evaporated to dryness. The residue was dried in an oven at 110℃. The dried powder was calcined in a muffle furnace at 450℃ for 2h to obtain the 0.1% Pt-SAPO-34 catalyst.

[0033] Example 6 A 0.1% Pt-SSZ-13 CO oxidation catalyst was prepared by the following steps: 30g of SSZ-13 molecular sieve was weighed, and 15mL of a platinum tetrachloride mother liquor with a Pt content of 2g / L was weighed. Deionized water was added to bring the total volume to 150g. The molecular sieve was added to the diluted platinum tetrachloride aqueous solution and stirred thoroughly for 30min. The slurry was then sealed with plastic wrap and transferred to an oil bath at 80℃ and stirred for 12h. After the reaction was completed, the plastic wrap was removed, and the mixture was stirred in the reactor at 80℃ until the solution evaporated to dryness. The residue was dried in an oven at 110℃. The dried powder was calcined in a muffle furnace at 450℃ for 2h to obtain the 0.1% Pt-SSZ-13 catalyst.

[0034] Comparative Example 1 A 0.1% Pt-TiO2CO oxidation catalyst was prepared by the following steps: 30g of TiO2 powder was weighed, and 15mL of a platinum tetrachloride mother liquor with a 2g / L Pt content was weighed. Deionized water was added to bring the total volume to 150g. The TiO2 powder was added to the diluted platinum tetrachloride aqueous solution and stirred thoroughly for 30min. The slurry was then sealed with plastic wrap and transferred to an oil bath at 80℃ and stirred for 12h. After the reaction was completed, the plastic wrap was removed, and the mixture was stirred in the reactor at 80℃ until the solution evaporated to dryness. The residue was dried in an oven at 110℃. The dried powder was then calcined in a muffle furnace at 450℃ for 2h to obtain the 0.1% Pt-TiO2 catalyst.

[0035] Comparative Example 2 A 0.1% Pt-ZSM-5 CO oxidation catalyst was prepared. During preparation, the liquid ion exchange reaction temperature was adjusted to room temperature, preventing the noble metal ions from fully undergoing the ion exchange reaction with the molecular sieve, which instead became loaded onto the molecular sieve surface. The specific steps are as follows: 30g of ZSM-5 molecular sieve was weighed, along with 15mL of a platinum tetrachloride mother liquor with a Pt content of 2g / L. Deionized water was added to a final volume of 150g. The ZSM-5 molecular sieve was then added to the diluted platinum tetrachloride aqueous solution and stirred thoroughly for 30min. The slurry was then sealed with plastic wrap and stirred at room temperature for 12h. After the reaction was complete, the plastic wrap was removed, and stirring continued at room temperature until the solution evaporated to dryness. The remaining material was dried in an oven at 110℃. The dried powder was then calcined in a muffle furnace at 450℃ for 2h to obtain the 0.1% Pt-ZSM-5 catalyst.

[0036] Test case Alkali metal contamination pretreatment was performed on the catalyst samples before evaluating their catalytic activity and resistance to poisoning.

[0037] The catalyst samples obtained in Examples 1-6 and Comparative Examples 1-2 were pretreated. Potassium (K) was selected to study the catalyst's resistance to alkali poisoning. Potassium oxide (2% by weight) poisoning catalyst was prepared by impregnation. The specific procedure was as follows: 0.428 g of potassium nitrate was dissolved in 50 mL of deionized water, then 10 g of catalyst was added to the solution. After stirring for 1 hour, excess water was evaporated by stirring in an oil bath at 100°C. The sample was then transferred to an oven and dried at 100°C for 6 hours. Finally, it was placed in a muffle furnace and calcined at 400°C at a heating rate of 2°C / min for 4 hours. The calcined sample was then pressed into tablets and granulated to 10-20 mesh to obtain the alkali metal contamination pretreated catalyst particles.

[0038] The pretreated catalyst samples were tested for catalytic activity and anti-poisoning performance.

[0039] The catalyst particles were tested for CO catalytic oxidation under simulated sintering flue gas conditions in the steel industry. The specific test method was as follows: 3.5g of catalyst particles were placed in a fixed-bed reactor, and simulated sintering flue gas was introduced. The simulated sintering flue gas contained 5000 mg / m³ of CO. 3 CO, 500 mg / m 3 NO, 150mg / m 3 HCl, 50 mg / m 3 SO2, 6% O2, 10% H2O, and N2 are in equilibrium, with a volume hourly space velocity (VHSV) of 10000 h⁻¹. -1 The test temperature was 240℃. The CO concentration in the exhaust gas was detected online using a NICOLET infrared gas analyzer, and the change in CO conversion rate with reaction time was obtained. The test results are as follows: Figure 1 As shown.

[0040] according to Figure 1 It can be seen that the catalysts prepared in Examples 1-6 maintained high catalytic activity within 72 hours, with CO conversion rates remaining above 92%. In contrast, the catalyst prepared in Comparative Example 1 showed a continuous decrease in activity after 6 hours, with a CO conversion rate of only 50.5% after 48 hours. In Comparative Example 2, the liquid ion exchange reaction temperature was adjusted to room temperature, preventing the noble metal ions and molecular sieve from fully undergoing the ion exchange reaction. Instead, the ions were loaded onto the surface of the molecular sieve, resulting in significantly reduced catalytic activity and stability. The CO conversion rate was only 77.2% at the beginning, and then the catalytic activity continued to decline, with the CO conversion rate dropping below 50% after 24 hours and only 24.3% after 72 hours.

[0041] In summary, this invention uses molecular sieves as a carrier and precious metals as active components. Through two ion exchange processes—liquid ion exchange and solid ion exchange (calcination)—the precious metal active components are loaded into the pores of the molecular sieve carrier. The resulting catalyst exhibits excellent catalytic activity and resistance to poisoning in the catalytic oxidation of CO in sintering flue gas, and has broad application prospects in the oxidation of CO in sintering flue gas in the steel industry.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing a CO oxidation catalyst resistant to poisoning, characterized in that, Includes the following steps: A slurry is obtained by mixing a molecular sieve support and a noble metal precursor solution; the molecular sieve support includes one or more of ZSM-5, SAPO-34 and SSZ-13; the noble metal element in the noble metal precursor solution includes one or more of Pt, Pd and Rh. The slurry is subjected to liquid ion exchange under heat treatment conditions to obtain ion exchange products; the heat treatment temperature is above 60°C. The ion exchange product was calcined to obtain an anti-poisoned CO oxidation catalyst.

2. The preparation method according to claim 1, characterized in that, The mass of the noble metal precursor in the noble metal precursor solution is 0.05 to 1% of the mass of the molecular sieve support.

3. The preparation method according to claim 1, characterized in that, The noble metal precursor solution is obtained by diluting the noble metal precursor mother liquor; the mass ratio of the noble metal precursor solution to the molecular sieve support is 2~8:

1.

4. The preparation method according to claim 1, characterized in that, The mixing time is 10-60 minutes.

5. The preparation method according to claim 1, characterized in that, The heat treatment is performed at a temperature of 60~100℃ for a time of 6~16h.

6. The preparation method according to claim 1, characterized in that, The roasting temperature is 350~550℃, and the time is 1~8h.

7. The anti-poisoning CO oxidation catalyst prepared by the preparation method according to any one of claims 1 to 6, characterized in that, It includes a molecular sieve support and a noble metal active component loaded on the molecular sieve support; the molecular sieve support includes one or more of ZSM-5, SAPO-34 and SSZ-13, and the noble metal active component includes one or more of Pt, Pd and Rh.

8. The application of the anti-poisoning CO oxidation catalyst according to claim 7 in the catalytic oxidation of CO.

9. A method for treating CO-containing flue gas, characterized in that, The anti-poisoning CO oxidation catalyst of claim 7 is brought into contact with CO-containing flue gas to catalytically oxidize the CO in the flue gas.

10. The application according to claim 9, characterized in that, The flue gas is sintering flue gas from the iron and steel industry; the volume hourly space velocity of the flue gas and the catalyst is 6000~20000 h⁻¹. -1 The temperature for the catalytic oxidation is 220~250℃.

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