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Metal alloy catalyst for formaldehyde purification and preparation method thereof

A metal alloy and formaldehyde purification technology, which is applied in the field of formaldehyde purification, can solve the problems of difficulty in fully utilizing alloy catalysts, uneven distribution of active components, high consumption of precious metals, etc., to reduce the consumption of precious metals, great market application potential, and simple production process Effect

Active Publication Date: 2015-05-27
HUIZHOU RES INST OF SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN102895971 discloses a load Au 1-x Pt x Alloy nanoparticles of MnO 2 Catalyst, where Au 1-x Pt x The loading of alloy nanoparticles accounts for 1% to 5% of the mass of the catalyst, which does not solve the problem of high consumption of precious metals
CN103357409 has reported a kind of room temperature noble metal and rare earth element composite metal alloy formaldehyde catalytic oxidizer, and it is to be carrier with composite crystal form nano-titanium dioxide, under alkaline condition, noble metal and rare earth element are directly deposited on the carrier, but this preparation method is easy Causes the problem of uneven distribution of active components and low degree of alloying, making it difficult to give full play to the effectiveness of alloy catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 0.006g of Pt(acac) into a 50mL three-necked flask 2 , 0.0025g Ni(acac) 2 and 5mL oleylamine, heated in an oil bath at 70°C for 10min, passed through 0.1MPaCO, heated at 240°C for 60min, cooled to room temperature, added an appropriate amount of ethanol, centrifuged to obtain composite noble metal alloy nanoparticles dissolved in n-butylamine, added 1g Al 2 o 3 , stirred at room temperature for three days. Add an appropriate amount of ethanol, centrifuge to obtain the product, put it into a vacuum drying oven for drying, and roast at 200°C for 1 hour in an air atmosphere. The obtained catalyst is reduced with HCHO solution and then dried. The molar ratio of the amount of HCHO added to the content of noble metal Pt is 20, A composite precious metal alloy catalyst for purifying formaldehyde at room temperature is prepared, the weight percentage of platinum is 0.3%, and the weight percentage of nickel is 0.05%.

Embodiment 2

[0025] Add 0.008gPt(acac) into a 50mL three-necked flask 2 , 0.0025g Fe(acac) 3 and 5mL oleylamine, heated in an oil bath at 80°C for 10min, introduced 0.15 MPa CO, heated at 220°C for 60min, cooled to room temperature, added an appropriate amount of ethanol, centrifuged to obtain composite noble metal alloy nanoparticles dissolved in n-butylamine, added 1g TiO 2 , stirred at room temperature for three days. Add an appropriate amount of ethanol, centrifuge to obtain the product, put it in a vacuum oven for drying, and roast at 300°C for 1 hour in an air atmosphere. 2 Atmosphere and 300 o C reduced for 3 hours to obtain a composite precious metal alloy catalyst for purifying formaldehyde at room temperature, the weight percentage of platinum was 0.4%, and the weight percentage of iron was 0.04%.

Embodiment 3

[0027] Add 0.006g of Pt(acac) into a 50mL three-necked flask 2 , 0.002g Fe(acac) 3 , 0.002g Ni(acac) 2 and 5mL oleic acid, heated in an oil bath at 70°C for 10min, introduced 0.1MPa CO, heated at 240°C for 60min, cooled to room temperature, added an appropriate amount of ethanol, centrifuged to obtain composite noble metal alloy nanoparticles dissolved in n-butylamine, added 1g Al 2 o 3 , stirred at room temperature for three days. Add an appropriate amount of ethanol, centrifuge to obtain the product, put it into a vacuum drying oven for drying, and roast at 200°C for 1 hour in an air atmosphere. The obtained catalyst is reduced with HCHO solution and then dried. The molar ratio of the amount of HCHO added to the content of noble metal Pt is 30, A composite noble metal alloy catalyst for purifying formaldehyde at room temperature is prepared, the weight percentage of platinum is 0.4%, the weight percentage of iron is 0.03%, and the weight percentage of nickel is 0.04%.

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Abstract

The invention discloses a metal alloy catalyst for formaldehyde purification and a preparation method thereof. The catalyst takes a metal alloy as an active center and takes a metal oxide as a carrier; the metal alloy is formed by compounding a precious metal A and a transition metal B; the precious metal A refers to any one of Pt, Ru, Rh, Pd and Ag; and the transition metal B refers to any one or a mixture of at least two out of Fe, Ni, Mn and Co. The preparation method comprises the following steps: synthesizing composite precious metal alloy nanoparticles by taking a precursor solution of the precious metal and the transition metal as a raw material under the CO atmosphere; loading the nanoparticles serving as active ingredients onto the carrier, reducing by virtue of hydrogen or a reducing solution to obtain the metal alloy catalyst. According to the catalyst disclosed by the invention, the indoor low-concentration harmful gas such as formaldehyde can be subjected to catalytic oxidation so as to prepare nontoxic and harmless CO2 and H2O under the room temperature conditions without light, electricity and other external auxiliary equipment, so that green purification of the formaldehyde is realized, and the catalyst has high stability.

Description

technical field [0001] The invention relates to the technical field of formaldehyde purification, in particular to a metal alloy catalyst used for formaldehyde purification and a preparation method thereof. Background technique [0002] Formaldehyde, also known as formaldehyde, is an important indoor gas pollutant. With the improvement of people's awareness of environmental protection, people are paying more and more attention to indoor formaldehyde pollution. In recent years, complaints caused by excessive indoor formaldehyde concentration have also been frequently reported. Therefore, it has become an urgent task to improve people's living environment to study formaldehyde purification technology to effectively eliminate indoor formaldehyde pollution. Methods for removing formaldehyde from air include adsorption, biological removal, plasma, and catalytic oxidation, each of which has its own advantages and disadvantages. Among them, the most commonly used method is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01D53/86B01D53/72
Inventor 纪红兵芮泽宝刘洋
Owner HUIZHOU RES INST OF SUN YAT SEN UNIV
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