Alloy catalyst for degrading formaldehyde, and preparation method and application of alloy catalyst

An alloy catalyst and formaldehyde technology, applied in the field of nanomaterials, can solve the problems of unsatisfactory catalytic oxidation effect, inability to produce cost-effectiveness, large platinum loading capacity, etc., and achieve the advantages of adsorption, enrichment of oxygen vacancies, and reduction of nanoparticle size Effect

Inactive Publication Date: 2018-11-30
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The application of supported platinum catalysts is mainly due to the inability to produce cost-effectiveness due to the large amount of platinum loaded, and the catalytic oxidation at room temperature has defects such as incomplete oxidation of low-concentration formaldehyde and poor stability, which make the catalytic oxidation effect unsatisfactory.

Method used

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  • Alloy catalyst for degrading formaldehyde, and preparation method and application of alloy catalyst
  • Alloy catalyst for degrading formaldehyde, and preparation method and application of alloy catalyst
  • Alloy catalyst for degrading formaldehyde, and preparation method and application of alloy catalyst

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Embodiment 1

[0039] An embodiment of the alloy catalyst for degrading formaldehyde of the present invention, the alloy catalyst described in this embodiment is prepared by the following method:

[0040] (1) Add 0.0558g of cerium nitrate hexahydrate crystals to 5.5ml of deionized water, stir at room temperature for 0.1 hour to completely dissolve in deionized water, and add 1.8g of TiO at 25°C 2 Nanomaterials, magnetically stirred for 4 hours, where Ce relative to TiO 2The mass fraction is 1%, and then put the uniformly mixed sample into an oven to dry at 110°C for 12 hours, cool the dried sample, grind it, and roast it at 400°C for 4 hours to obtain a Ce / P25 solid material;

[0041] (2) Add 1.5g Ce / P25 in 30ml of deionized water, stir magnetically for 0.5 hours to fully disperse in deionized water, add 3.984ml of chloroplatinic acid hexahydrate solution with a concentration of 3.958g / L at 25°C, and continue stirring 1 hour, wherein the percentage of Pt mass and Pt and Ce / P25 carrier mass ...

Embodiment 2

[0046] An embodiment of the alloy catalyst for degrading formaldehyde of the present invention, the alloy catalyst described in this embodiment is prepared by the following method:

[0047] (1) Add 0.167g of cerium nitrate hexahydrate crystals to 5.5ml of deionized water, stir at room temperature for 0.1 hour to completely dissolve in deionized water, and add 1.8g of TiO at 25°C 2 Nanomaterials, magnetically stirred for 4 hours, where Ce relative to TiO 2 The mass fraction is 3%, and then put the uniformly mixed sample into an oven to dry at 110°C for 12 hours, cool the dried sample, grind it, and roast it at 400°C for 4 hours to obtain a Ce / P25 solid material;

[0048] (2) Add 1.5g Ce / P25 in 30ml of deionized water, stir magnetically for 0.5 hours to fully disperse in deionized water, add 3.984ml of chloroplatinic acid hexahydrate solution with a concentration of 3.958g / L at 25°C, and continue stirring 1 hour, wherein the percentage of Pt mass and Pt and Ce / P25 carrier mass ...

Embodiment 3

[0053] An embodiment of the alloy catalyst for degrading formaldehyde of the present invention, the alloy catalyst described in this embodiment is prepared by the following method:

[0054] (1) Add 0.279g of cerium nitrate hexahydrate crystals to 5.5ml of deionized water, stir at room temperature for 0.1 hour to completely dissolve in deionized water, and add 1.8g of TiO 2 Nanomaterials, magnetically stirred for 4 hours, where Ce relative to TiO 2 The mass fraction is 5%, and then put the uniformly mixed sample into an oven to dry at 110°C for 12 hours, cool the dried sample, grind it, and roast it at 400°C for 4 hours to obtain a Ce / P25 solid material;

[0055] (2) Add 1.5g Ce / P25 in 30ml of deionized water, stir magnetically for 0.5 hours to make it fully dispersed in deionized water, add 3.984ml of chloroplatinic acid hexahydrate solution with a concentration of 3.958g / L at 25°C, and continue stirring for 1 Hour, wherein the percentage of Pt mass and Pt and Ce / P25 carrier ...

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Abstract

The invention provides a preparation method of an alloy catalyst for degrading formaldehyde. The method comprises the following steps: (1) adding a TiO2 nano material and a cerium compound into water,carrying out impregnation and stirring to disperse cerium onto the TiO2 nano material, carrying out drying, grinding and roasting to obtain a Ce/TiO2 solid material; (2) adding the Ce/TiO2 solid material into water, carrying out stirring until the Ce/TiO2 solid material is completely dispersed, adding a platinum compound, and carrying out impregnation and stirring to disperse platinum onto the Ce/TiO2 solid material; (3) adding an alkali solution as a stabilizer, uniformly carrying out stirring and mixing, then adding a reducing agent, and carrying out a reduction reaction; and (4) separatingthe solid obtained in the step (3), carrying out water washing, alcohol washing, drying and cooling, and then carrying out grinding to obtain the Pt-Ce/TiO2 catalyst. The method is simple and feasible, and no harsh reaction conditions are required. According to the prepared Pt-Ce/TiO2 catalyst, the Pt nano particles are stabilized through the addition of the cerium according to the method, so that the dispersity is improved, the nano particle size is reduced, abundant oxygen vacancies are provided, and formaldehyde can be effectively decomposed.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to an alloy catalyst for degrading formaldehyde and its preparation method and application. Background technique [0002] Formaldehyde is a colorless, toxic gas with a strong pungent smell. Indoor formaldehyde has a wide range of sources. When the concentration of formaldehyde in the air is 0.1mg / cm 3 When the concentration of formaldehyde rises, the human body will feel uncomfortable. As the concentration of formaldehyde increases, it will cause symptoms of varying degrees such as chest pain, allergies, and coughing, and even death in severe cases. Long-term exposure to low-concentration formaldehyde can cause chronic respiratory diseases, chromosomal abnormalities, and even nasopharyngeal cancer or neonatal deformities. [0003] Due to the great threat of formaldehyde to the human body, in recent years, there has been a lot of research on the method of removing indoor formaldeh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/86B01D53/72
CPCB01D53/8668B01D2257/708B01J23/63
Inventor 刘自力石圆圆左建良郑文芝
Owner GUANGZHOU UNIVERSITY
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