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Au1-xPtx alloy nanoparticle-loading MnO2 catalyst, preparation method and applications thereof

An alloy nanoparticle, au1-xptx technology, applied in the field of nanomaterial preparation, can solve the problems of large consumption of precious metals and increased catalyst costs, and achieve the effects of low cost, improved capacity, and reduced loss

Active Publication Date: 2013-01-30
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, single noble metal-supported catalysts have problems such as large consumption of noble metals, increased catalyst costs, and further improvement in the catalytic degradation efficiency of formaldehyde.

Method used

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  • Au1-xPtx alloy nanoparticle-loading MnO2 catalyst, preparation method and applications thereof
  • Au1-xPtx alloy nanoparticle-loading MnO2 catalyst, preparation method and applications thereof
  • Au1-xPtx alloy nanoparticle-loading MnO2 catalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Nest-shaped MnO 2 Synthesis of carrier: Weigh 0.5531g KMnO 4 Dissolved in 14mL of water, transferred to a 40mL container lined with Teflon, and then added dropwise with a pipette containing 0.8873gMnSO 4 ·H 2 O and 0.3 mL of 98% concentrated H 2 SO 4 21mL aqueous solution, the dropping rate is about 1-2 drops / s, hydrothermal reaction at 120°C for 12 hours, centrifuge the obtained dark brown product, wash the obtained precipitated product with water and ethanol, and finally wash the obtained product at 60 ℃ oven dried overnight to obtain the bird's nest-like MnO 2 carrier.

[0072] Take a small amount of dried samples and redisperse them in ethanol, ultrasonically disperse them under 120w, 40KHz ultrasonic conditions for 5 to 20 minutes, spot them on silicon wafers, stick them on the sample stage of scanning electron microscope, spray gold after drying, and then Observed on a scanning electron microscope, MnO 2 Scanning electron microscope picture of the carrier; ...

Embodiment 2

[0074] 1) According to the molar ratio of PVP: total moles of chloroplatinic acid and chloroauric acid, the ratio of 35:1 to 45:1 is to weigh PVP (the degree of polymerization is 10 to 1000), then add it to the three-necked bottle and add 60-100mL of water, mechanically stirred to dissolve PVP; put the above-mentioned three-necked bottle into a water bath with a temperature of 70-90°C, and keep stirring; 1-x Pt x The proportional relation of x=0 in the alloy is added dropwise with chloroplatinic acid aqueous solution (concentration is 30~50mmol / L) and chloroauric acid aqueous solution (concentration is 30~50mmol / L) to obtain the mixed solution, after mechanical stirring for 5~10 minutes, drop Plus contains KBH 4 Aqueous solution of which: KBH 4 : the mol ratio of the total moles of chloroplatinic acid and chloroauric acid is 15: 1~25: 1, after continuing mechanical stirring for 2~10 minutes, the whole reaction reacted 1~4 hours under the water bath of 70~90 ℃, x Au = 0 1-x...

Embodiment 3

[0078] 1) According to the molar ratio of PVP: chloroplatinic acid and chloroauric acid, the molar ratio of the total moles of chloroplatinic acid and chloroauric acid is 30: 1 ~ 40: 1. Weigh PVP (the degree of polymerization is 10 ~ 1000), then add it to the three-necked bottle and add 60-100mL of water, stir mechanically to dissolve PVP; put the above-mentioned three-necked bottle into a water bath with a temperature of 60-80°C, and keep stirring; 1-x Pt x The proportional relationship of x=0.25 in the alloy is respectively added dropwise with chloroplatinic acid aqueous solution (concentration is 30~50mmol / L) and chloroauric acid aqueous solution (concentration is 30~50mmol / L) to obtain the mixed solution, after mechanical stirring for 5~10 minutes, Drops containing KBH 4 Aqueous solution of which: KBH 4 : the mol ratio of the total moles of chloroplatinic acid and chloroauric acid is 10: 1~20: 1, after continuing mechanical stirring for 2~10 minutes, the whole reaction r...

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Abstract

The present invention relates to an Au1-xPtx alloy nanoparticle-loading MnO2 catalyst, a preparation method and applications thereof. According to the present invention, PVP, KBH4, chloroplatinic acid and chlorauric acid are adopted as raw materials to synthesize Au1-xPtx alloy nanoparticles under an aqueous solution condition, then the synthesized Au1-xPtx alloy nanoparticles are adopted as an active component to be loaded on a MnO2 carrier to obtain the catalyst comprising the MnO2 carrier and the Au1-xPtx alloy nanoparticles loaded on the surface of the MnO2 carrier, wherein a loading amount of the Au1-xPtx alloy nanoparticles is 1-5% of the mass of the catalyst, x in the Au1-xPtx alloy nanoparticles is more than 0 and less than 1, and the catalyst can be used for catalysis degradation of indoor pollutant formaldehyde, and has advantages of high efficiency, low energy consumption, easy operation, mild reaction conditions, and secondary pollution elimination, wherein formaldehyde can be subjected to complete catalysis degradation at a low temperature by using the catalyst.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanomaterials, in particular to loading highly dispersive Au 1-x Pt x Alloy nanoparticles of MnO 2 Catalyst, preparation method thereof, and application of the catalyst in catalytic degradation of formaldehyde pollutants. Background technique [0002] In recent years, with the increase of people's popular science knowledge, the public has paid more and more attention to the pollution caused by formaldehyde. Formaldehyde is the most important and the most serious pollutant in indoor air. It has high toxicity and is carcinogenic and teratogenic. A variety of interior decoration materials, such as floor glue, plastic veneer, plywood, latex paint, synthetic fibers, etc., may release formaldehyde into the room. The formaldehyde released indoors can last for several years, seriously endangering human health. Formaldehyde ranks second on the priority list of toxic chemicals in my country. For...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68A62D3/38
Inventor 贺军辉于学华
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI