A bimetallic ag and pd supported w03 material and a method of making the same

Abstract

The application discloses a kind of bimetallic Ag and Pd loaded WO3 material and preparation method thereof, it is related to sensor material preparation technical field, comprising the following steps: step one: tungsten source is dissolved in to ethanol solution, mix, hydrolysis, aging, precipitate, flush, dry, calcination, cooling;Step two: add deionized water, add silver source solution and palladium source, and stir after adding anti-antibody acid;Step three: centrifugation, wash with ethanol and deionized water, dry;Step four: select alumina ceramic as the substrate gold interdigital electrode as base electrode material, with hook line pen dip WO3 nanoparticle dispersion liquid evenly coated on the interdigital electrode surface;Step five: electrode drying, heat treatment.The application is prepared by simple operation, environmentally friendly, economical preparation method, and efficient gas sensing material, which can exhibit high sensitivity, rapid response, good selectivity and other characteristics at lower working temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensor material preparation, in particular to a bimetallic Ag and Pd loaded WO3 material and a preparation method thereof. BACKGROUND

[0002] With the great progress of industry and technology, a large amount of energy is consumed, and the content of toxic and harmful gases in the air increases, which seriously threatens the atmospheric environment. On the one hand, the emission of toxic gases such as nitrogen oxides and sulfur oxides in industrial waste gas is prone to form greenhouse effect, acid rain, etc., on the other hand, when the concentration of these toxic gases is too high, it will cause poisoning, and even explosion accidents, causing great loss to people's life safety and property. Therefore, it is necessary to monitor these gases in real time and accurately. Gas sensors have been widely used in various fields due to their small size, low cost, accurate detection and timely response. Among many gas sensor materials, transition metal oxides have attracted much attention due to their good chemical stability and thermal stability.

[0003] Tungsten trioxide (WO3) is a common n-type wide band gap semiconductor material with a transition state, with a band gap of about 2.6-2.8 eV. As a wide band gap metal oxide semiconductor, its unique hierarchical structure has a large surface area that can fully contact and react with gas molecules, making it a promising material for high-performance gas sensors. WO3 is widely used as an electrode in gas sensors, humidity sensors, and photocatalysis due to its unique physical and chemical properties. WO3 material has become one of the most promising gas-sensitive materials. However, the sensitivity, selectivity and stability of gas sensors made of pure WO3 material are poor, which cannot meet the requirements of practical application. Therefore, it is necessary to modify WO3 by doping, compounding and other means to improve its sensing performance. However, the existing WO3 modification synthesis process is complex, the conditions are harsh, and the cost is high. It is still a challenge to realize high sensitivity and high selectivity detection of low concentration gas at low temperature. SUMMARY

[0004] The present application relates to the technical field of sensor material preparation, in particular to a bimetallic Ag and Pd loaded WO3 material and a preparation method thereof.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a preparation method of a bimetallic Ag and Pd loaded WO3 material, comprising the following steps:

[0006] Step 1: Preparation of WO3 nanoparticles: Dissolve tungsten source in ethanol solution, ultrasonically mix the solution until homogeneous, hydrolyze and age the resulting solution until a blue-green precipitate is formed; filter the precipitate after aging, wash with ethanol, dry, and finally calcine the sample in a tube furnace and cool to obtain WO3 nanoparticle material.

[0007] Step 2: Loading Ag and Pd ions: WO3 nanoparticle powder is added to deionized water, ultrasonically stirred, and then silver source solution and palladium source are added. After adding oxidative acid, the mixture is stirred to obtain a redox solution.

[0008] Step 3: Post-processing: Transfer the obtained solution to a centrifuge tube, centrifuge and collect the product. Finally, wash and dry with ethanol and deionized water to obtain Ag and Pd-loaded WO3 nanoparticle materials.

[0009] Step 4: Electrode coating: Alumina ceramic as substrate is selected as the gold interdigitated electrode as the base electrode material. The WO3 nanoparticles prepared in step 3 are dispersed in an ethanol solution. After ultrasonic stirring, a surfactant is added to form a WO3 nanoparticle dispersion. The suspension is then evenly coated onto the interdigitated electrode with a fine-tipped pen.

[0010] Step 5: Place the electrode coated with WO3 nanoparticles in a drying oven or allow it to dry naturally at room temperature. Then, perform heat treatment on the dried electrode.

[0011] Preferably, the tungsten source in step one is selected from one or more of tungsten hexachloride, tungstic acid, and ammonium tungstate.

[0012] Preferably, the ultrasonic mixing time in step one is 30 minutes. During the hydrolysis process, the solution changes from yellow to orange and then to green. The resulting solution is aged, and the solution gradually turns dark green and then black, eventually precipitating a blue-green precipitate.

[0013] Preferably, the solution is aged at a temperature of 30°C for 48 hours.

[0014] Preferably, in step one, the calcination temperature of the tubular furnace is 500℃~600℃, and the calcination time is 2h~3h.

[0015] Preferably, in step two, the silver source is a silver nitrate solution, and the palladium source is one of palladium nitrate and palladium chloride.

[0016] Preferably, in step two, 0.5g of WO3 nanoparticle powder is added to 10ml of deionized water, sonicated for 20min, and then silver source solution and palladium source are added. After adding oxalic acid, the mixture is stirred at 80℃ for 40min. The concentration of the silver source is 0.001mol / L, and the amount added is 0.001~29.5ml. The amount of palladium source added is 0.001~0.0053mg.

[0017] Preferably, in step four, the interdigitated electrode of the substrate is fixed, and WO3 nanoparticle dispersion is uniformly coated on the surface of the interdigitated electrode using a fine-tipped pen.

[0018] The present invention also provides a bimetallic Ag and Pd-loaded WO3 material, which is prepared by the above-mentioned preparation method of Ag and Pd-loaded WO3 nanoparticle material.

[0019] Preferably, based on the Ag and Pd-loaded WO3 nanoparticle material, the mass percentage of Ag in the Ag and Pd-loaded WO3 nanoparticle material is 0.001% to 2.00%, and the mass percentage of Pd in ​​the Ag and Pd-loaded WO3 nanoparticle material is 0.001% to 2.00%.

[0020] The technical effects and advantages of this invention are as follows:

[0021] (1) This invention uses a hydrolysis method to prepare WO3 material, and then uses an impregnation method to dope Ag and Pd into WO3 material to synthesize Ag and Pd loaded WO3 nanomaterials. Due to its small particle size, the Ag and Pd loaded WO3 material has the characteristics of large specific surface area, high surface energy, many active sites, and strong adsorption capacity, which can promote the chemical reaction between WO3 material and the target gas and improve the sensitivity of the device. In addition, noble metals on the support surface can act as catalysts, increase oxygen vacancies, change the band gap size, generate defects in the lattice, and reduce the potential barrier in the adsorption-desorption reaction process of gas on the material surface. Electrodes made from modified WO3 material are used in sensors to improve electrode performance and improve sensing performance, thereby improving the selectivity and sensitivity of the gas sensor.

[0022] (2) This invention deposits Ag and Pd on the surface of tungsten trioxide through a simple and mild solution treatment. The content of Ag and Pd nanoparticles can be controlled by adjusting the solution concentration and immersion time. Furthermore, by dispersing the nanoparticles on the surface of the electrode, a WO3 nanomaterial gas sensor with high sensitivity, high selectivity and good stability is prepared.

[0023] (3) This invention uses a simple, environmentally friendly and economical preparation method to obtain a high-efficiency gas sensing material, which solves the shortcomings of existing gas sensor materials, such as complex synthesis process, harsh conditions, high cost, and difficulty in achieving high sensitivity and high selectivity detection of low-concentration gases at low temperatures. It can exhibit high sensitivity, rapid response and good selectivity for gases at lower operating temperatures. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the preparation process of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] This invention provides, for example Figure 1 The bimetallic Ag and Pd supported WO3 material and its preparation method are shown, including the following steps:

[0027] Step 1: Preparation of WO3 nanoparticles: A tungsten source was dissolved in an ethanol solution and ultrasonically mixed for 30 minutes. After hydrolysis, the resulting solution was aged. During hydrolysis, the solution changed from yellow to orange and then to green. The aged solution gradually turned dark green and then black, eventually precipitating a blue-green precipitate. The aging temperature was 30℃, and the time was 48 hours. After aging, the precipitate was filtered, washed with ethanol, and dried. Finally, the sample was calcined in a tube furnace at 500℃–600℃ for 2–3 hours. After cooling, WO3 nanoparticles were obtained. The tungsten source was selected from one or more of tungsten hexachloride, tungstic acid, and ammonium tungstate.

[0028] Step 2: Loading Ag and Pd ions: WO3 nanoparticle powder was added to deionized water, ultrasonically stirred, and then silver source solution and palladium source were added. After adding oxalic acid, the mixture was stirred to obtain a redox solution. The silver source was silver nitrate solution, and the palladium source was either palladium nitrate or palladium chloride. 0.5g of WO3 nanoparticle powder was added to 10ml of deionized water, ultrasonicated for 20min, and then silver source solution and palladium source were added. After adding oxalic acid, the mixture was stirred at 80℃ for 40min. The concentration of the silver source was 0.001mol / L, and the amount added was 0.001~29.5ml. The amount of palladium source added was 0.001~0.0053mg.

[0029] Step 3: Post-processing: Transfer the obtained solution to a centrifuge tube, centrifuge and collect the product. Finally, wash and dry with ethanol and deionized water to obtain Ag and Pd-loaded WO3 nanoparticle materials.

[0030] Step 4: Electrode coating: Alumina ceramic as substrate is selected as the gold interdigitated electrode as the base electrode material. The WO3 nanoparticles prepared in step 3 are dispersed in an ethanol solution. After ultrasonic stirring, a surfactant is added to form a WO3 nanoparticle dispersion. The suspension is then evenly coated onto the interdigitated electrode with a fine-tipped pen.

[0031] Step 5: Place the electrode coated with WO3 nanoparticles in a drying oven or allow it to air dry at room temperature to remove the solvent from the electrode surface. After drying, perform heat treatment on the electrode at a temperature between 450℃ and 500℃ for a time typically between 1 and 3 hours. This heat treatment time range helps ensure that the WO3 nanoparticle dispersion forms a thin film, crystallizes sufficiently, and has stable properties, thereby further improving the adhesion between the WO3 nanoparticles and the substrate electrode and the electrode performance.

[0032] Example 1

[0033] Preparation of WO3 nanoparticles: First, 1.17 g of tungsten hexachloride was dissolved in 230 ml of anhydrous ethanol. The solution was ultrasonically mixed for 30 min to ensure complete dissolution. During hydrolysis, the solution changed from yellow to orange and then to green. The dissolved solution was then aged at room temperature (30 °C) for 48 h. The solution gradually turned dark green and then black, eventually precipitating a blue-green precipitate. The precipitate was filtered and washed with ethanol, then dried in a 60 °C oven for 24 h. Finally, the sample was calcined in a tube furnace at 600 °C for 3 h in air, and then cooled to room temperature to obtain the WO3 nanoparticle sample.

[0034] Loading Ag and Pd ions: Weigh 0.2g of the prepared WO3 nanoparticle sample and disperse it in 10ml of deionized water. After ultrasonic stirring for 10min, a WO3 dispersion is obtained. Add 0.001ml of silver nitrate solution and 0.001g of palladium chloride, and add 0.006g of ascorbic acid. Stir at 80℃ for 40min to obtain a redox solution.

[0035] Post-processing: The solution obtained in the above steps was transferred to a centrifuge tube, centrifuged and the product was collected. Finally, it was washed with ethanol and deionized water and dried to obtain the Ag and Pd loaded WO3 nanoparticle sample, denoted as S1.

[0036] Electrode coating: Alumina ceramic as substrate is selected as the gold interdigitated electrode as the base electrode material. The WO3 nanoparticles prepared in step 3 are dispersed in ethanol solution. After ultrasonic stirring, a surfactant is added to form a WO3 nanoparticle dispersion. The suspension is evenly coated on the interdigitated electrode with a fine-tipped pen.

[0037] Step 5: Place the electrode coated with WO3 nanoparticles in a drying oven or allow it to air dry at room temperature to remove the solvent from the electrode surface. After drying, perform heat treatment on the electrode at a temperature between 450℃ and 500℃ for a duration of 1 to 3 hours. This heat treatment time range helps ensure that the WO3 nanoparticle dispersion forms a thin film, crystallizes sufficiently, and has stable properties, thereby further improving the adhesion between the WO3 nanoparticles and the substrate electrode and the electrode performance. The resulting electrode product coated with WO3 nanoparticles with Ag and Pd loading is designated as A1.

[0038] Example 2

[0039] Preparation of WO3 nanoparticles: First, 1.17 g of tungsten hexachloride was dissolved in 230 ml of anhydrous ethanol. The solution was ultrasonically mixed for 30 min to ensure complete dissolution. During hydrolysis, the solution changed from yellow to orange and then to green. The dissolved solution was then aged at room temperature (30 °C) for 48 h. The solution gradually turned dark green and then black, eventually precipitating a blue-green precipitate. The precipitate was filtered and washed with ethanol, then dried in a 60 °C oven for 24 h. Finally, the sample was calcined in a tube furnace at 600 °C for 3 h in air, and then cooled to room temperature to obtain the WO3 nanoparticle sample.

[0040] Loading Ag and Pd ions: Weigh 0.2g of the prepared WO3 nanoparticle sample and disperse it in 10ml of deionized water. After ultrasonic stirring for 10min, a WO3 dispersion was obtained. Add 29.5ml of silver nitrate solution and 0.001mg of palladium chloride, and add 6mg of ascorbic acid. Stir at 80℃ for 40min to obtain a redox solution.

[0041] Post-processing: The solution obtained in the above steps was transferred to a centrifuge tube, centrifuged and the product was collected. Finally, it was washed with ethanol and deionized water and dried to obtain the Ag and Pd loaded WO3 nanoparticle sample, denoted as S2.

[0042] Electrode coating: Alumina ceramic as substrate is selected as the gold interdigitated electrode as the base electrode material. The WO3 nanoparticles prepared in step 3 are dispersed in ethanol solution. After ultrasonic stirring, a surfactant is added to form a WO3 nanoparticle dispersion. The suspension is evenly coated on the interdigitated electrode with a fine-tipped pen.

[0043] Step 5: Place the electrode coated with WO3 nanoparticles in a drying oven or allow it to air dry at room temperature to remove the solvent from the electrode surface. After drying, perform heat treatment on the electrode at a temperature between 450℃ and 500℃ for a duration of 1 to 3 hours. This heat treatment time range helps ensure that the WO3 nanoparticle dispersion forms a thin film, crystallizes sufficiently, and has stable properties, thereby further improving the adhesion between the WO3 nanoparticles and the substrate electrode and the electrode performance. The resulting electrode product coated with WO3 nanoparticles with Ag and Pd loading is designated as A2.

[0044] Example 3

[0045] Preparation of WO3 nanoparticles: First, 1.17 g of tungsten hexachloride was dissolved in 230 ml of anhydrous ethanol. The solution was ultrasonically mixed for 30 min to ensure complete dissolution. During hydrolysis, the solution changed from yellow to orange and then to green. The dissolved solution was then aged at room temperature (30 °C) for 48 h. The solution gradually turned dark green and then black, eventually precipitating a blue-green precipitate. The precipitate was filtered and washed with ethanol, then dried in a 60 °C oven for 24 h. Finally, the sample was calcined in a tube furnace at 600 °C for 3 h in air, and then cooled to room temperature to obtain the WO3 nanoparticle sample.

[0046] Loading Ag and Pd ions: Weigh 0.2g of the prepared WO3 nanoparticle sample and disperse it in 10ml of deionized water. After ultrasonic stirring for 10min, a WO3 dispersion was obtained. Add 19.6ml of silver nitrate solution and 1.77mg of palladium chloride, and add 6mg of ascorbic acid. Stir at 80℃ for 40min to obtain a redox solution.

[0047] Post-processing: The solution obtained in the above steps was transferred to a centrifuge tube, centrifuged and the product was collected. Finally, it was washed with ethanol and deionized water and dried to obtain Ag and Pd loaded WO3 nanoparticle sample, denoted as S3.

[0048] Electrode coating: Alumina ceramic as substrate is selected as the gold interdigitated electrode as the base electrode material. The WO3 nanoparticles prepared in step 3 are dispersed in ethanol solution. After ultrasonic stirring, a surfactant is added to form a WO3 nanoparticle dispersion. The suspension is evenly coated on the interdigitated electrode with a fine-tipped pen.

[0049] Step 5: Place the electrode coated with WO3 nanoparticles in a drying oven or allow it to air dry at room temperature to remove the solvent from the electrode surface. After drying, perform heat treatment on the electrode at a temperature between 450℃ and 500℃ for a duration of 1 to 3 hours. This heat treatment time range helps ensure that the WO3 nanoparticle dispersion forms a thin film, crystallizes sufficiently, and has stable properties, thereby further improving the adhesion between the WO3 nanoparticles and the substrate electrode and the electrode performance. The resulting electrode product coated with WO3 nanoparticles with Ag and Pd loading is called A3.

[0050] Example 4

[0051] Preparation of WO3 nanoparticles: First, 1.17 g of tungsten hexachloride was dissolved in 230 ml of anhydrous ethanol. The solution was ultrasonically mixed for 30 min to ensure complete dissolution. During hydrolysis, the solution changed from yellow to orange and then to green. The dissolved solution was then aged at room temperature (30 °C) for 48 h. The solution gradually turned dark green and then black, eventually precipitating a blue-green precipitate. The precipitate was filtered and washed with ethanol, then dried in a 60 °C oven for 24 h. Finally, the sample was calcined in a tube furnace at 600 °C for 3 h in air, and then cooled to room temperature to obtain the WO3 nanoparticle sample.

[0052] Loading Ag and Pd ions: Weigh 0.2g of the prepared WO3 nanoparticle sample and disperse it in 10ml of deionized water. After ultrasonic stirring for 10min, a WO3 dispersion was obtained. 14.7ml of silver nitrate solution and 2.65mg of palladium chloride were added, and 6mg of ascorbic acid was added and stirred. The mixture was stirred at 80℃ for 40min to obtain a redox solution.

[0053] Post-processing: The solution obtained in the above steps was transferred to a centrifuge tube, centrifuged and the product was collected. Finally, it was washed with ethanol and deionized water and dried to obtain the Ag and Pd loaded WO3 nanoparticle sample, denoted as S4.

[0054] Electrode coating: Alumina ceramic as substrate is selected as the gold interdigitated electrode as the base electrode material. The WO3 nanoparticles prepared in step 3 are dispersed in ethanol solution. After ultrasonic stirring, a surfactant is added to form a WO3 nanoparticle dispersion. The suspension is evenly coated on the interdigitated electrode with a fine-tipped pen.

[0055] Step 5: Place the electrode coated with WO3 nanoparticles in a drying oven or allow it to air dry at room temperature to remove the solvent from the electrode surface. After drying, perform heat treatment on the electrode at a temperature between 450℃ and 500℃ for a duration of 1 to 3 hours. This heat treatment time range helps ensure that the WO3 nanoparticle dispersion forms a thin film, crystallizes sufficiently, and has stable properties, thereby further improving the adhesion between the WO3 nanoparticles and the substrate electrode and the electrode performance. The resulting electrode product coated with WO3 nanoparticles with Ag and Pd loading is designated as A4.

[0056] Example 5

[0057] The difference from Example 1 is that 9.83 ml of silver nitrate solution and 3.53 mg of palladium chloride were added. The synthesized Ag and Pd-loaded WO3 nanoparticle sample was designated as S5, and the electrode product coated with Ag and Pd-loaded WO3 nanoparticles was designated as A5.

[0058] Example 6

[0059] The difference from Example 1 is that 0.001 ml of silver nitrate solution and 0.0053 mg of palladium chloride were added. The synthesized Ag and Pd loaded WO3 nanoparticle sample was designated as S6, and the electrode product coated with Ag and Pd loaded WO3 nanoparticles was designated as A6.

[0060] The test results of the prepared samples are as follows:

[0061]

[0062] The present invention also provides a bimetallic Ag and Pd-loaded WO3 material, which is prepared by the above-mentioned preparation method of Ag and Pd-loaded WO3 nanoparticles.

[0063] Based on Ag and Pd-loaded WO3 nanoparticles, Ag accounted for 0.001% to 2.00% of the mass of Ag and Pd-loaded WO3 nanoparticles, and Pd accounted for 0.001% to 2.00% of the mass of Ag and Pd-loaded WO3 nanoparticles.

[0064] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for the preparation of a bimetallic Ag and Pd supported WO3 material, characterized in that, The method comprises the following steps: Step one: preparation of WO3 nanoparticles: dissolve tungsten source in ethanol solution, mix the solution uniformly by ultrasonic, and then age the obtained solution after hydrolysis, finally precipitate blue-green sediment; filter the precipitate after aging, and then rinse with ethanol, dry, finally calcine the sample in a tube furnace, and obtain WO3 nanoparticle material after cooling; Step two: loading of Ag and Pd ions: add WO3 nanoparticle powder into deionized water, stir after ultrasonic, then add silver source solution and palladium source, and then add ascorbic acid to obtain redox solution after stirring; Step three: post-treatment: move the obtained solution to a centrifugal tube, collect the product after centrifugation, and then wash with ethanol and deionized water, dry, and finally obtain Ag and Pd loaded WO3 nanoparticle material; Step four: electrode coating: select alumina ceramic as the substrate of gold interdigital electrode as the base electrode material, disperse WO3 nanoparticles prepared in step three in ethanol solution, add surfactant to form WO3 nanoparticle dispersion after ultrasonic stirring, and then use a hook pen to dip the suspension and uniformly coat on the interdigital electrode; Step five: place the electrode coated with WO3 nanoparticles in a drying box or dry naturally at room temperature, and then heat treat the dried electrode.

2. A method of preparing a bimetallic Ag and Pd supported WO3 material according to claim 1, characterized in that, The tungsten source in step one is selected from one or more of tungsten hexachloride, tungstic acid, and ammonium tungstate.

3. A method of preparing a bimetallic Ag and Pd supported WO3 material according to claim 1, characterized in that, The ultrasonic mixing time in step one is 30 min, the solution changes from yellow to orange and then to green during the hydrolysis process; the obtained solution is aged, the solution gradually changes from dark green to black, and finally blue-green sediment is gradually precipitated.

4. A method of preparing a bimetallic Ag and Pd supported WO3 material according to claim 1, characterized in that, The aging temperature of the solution is 30℃, and the aging time is 48h.

5. The method of claim 1, wherein the dual metal Ag and Pd supported WO3 material is prepared by the steps of: The calcination temperature of the tube furnace in step one is 500-600℃, and the calcination time is 2-3h.

6. A method of preparing a bimetallic Ag and Pd supported WO3 material according to claim 1, characterized in that, The silver source in step two is silver nitrate solution, and the palladium source is one of palladium nitrate and palladium chloride.

7. A method of preparing a bimetallic Ag and Pd supported WO3 material according to claim 1, characterized in that, In step two, 0.2g of WO3 nanoparticle powder is added into 10ml of deionized water, ultrasonic stirring is performed for 20min, then silver source solution and palladium source are added, ascorbic acid is added after stirring, and then stirring is performed at 80℃ for 40min; the concentration of the silver source is 0.001mol / L, the addition amount is 0.001-29.5ml, and the addition amount of the palladium source is 0.001-0.0053g.

8. A method of preparing a bimetallic Ag and Pd supported WO3 material according to claim 1, characterized in that, In step four, the base electrode is fixed on a spin coater, the WO3 nanoparticle dispersion is added dropwise, and then the spin coater is started to make the dispersion uniformly coated on the surface of the electrode under the action of centrifugal force.

9. A bimetallic Ag and Pd supported WO3 material characterized in that, The bimetallic Ag and Pd loaded WO3 material is prepared by the method for preparing the Ag and Pd loaded WO3 nanoparticle material according to any one of claims 1-8.

10. A bimetallic Ag and Pd supported WO3 material according to claim 9, characterized in that, Based on the Ag and Pd loaded WO3 nanoparticle material, the mass percentage of Ag in the Ag and Pd loaded WO3 nanoparticle material is 0.001%-2.00%, and the mass percentage of Pd in the Ag and Pd loaded WO3 nanoparticle material is 0.001%-2.00%.

Images