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Catalyst for elimination of formaldehyde at room temperature and preparation method thereof

A technology for eliminating formaldehyde and catalysts, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem that non-precious metal catalysts cannot completely catalyze the oxidation of formaldehyde, formaldehyde catalytic oxidation has not been further studied, poor moisture resistance and other problems, to achieve excellent formaldehyde adsorption capacity and moisture resistance, excellent stability and moisture resistance, simple use conditions

Active Publication Date: 2017-03-29
苏州美吉科环保科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the above-mentioned noble metal catalysts in the prior art have problems such as poor moisture resistance and poor stability, and non-noble metal catalysts cannot completely catalyze the oxidation of formaldehyde at room temperature, and no further research has been carried out on the catalytic oxidation of formaldehyde at different concentrations.

Method used

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  • Catalyst for elimination of formaldehyde at room temperature and preparation method thereof
  • Catalyst for elimination of formaldehyde at room temperature and preparation method thereof
  • Catalyst for elimination of formaldehyde at room temperature and preparation method thereof

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preparation example Construction

[0037] The preparation method of the exemplary Beta molecular sieve carrier-loaded catalyst for room temperature formaldehyde purification comprises the steps:

[0038] (1) According to the published synthesis method, the Beta molecular sieve was synthesized by the template-free seed crystal method.

[0039] (2) The molecular sieve is treated, and a certain amount of Beta molecular sieve is ion-exchanged with a certain amount of ammonium nitrate, potassium nitrate or sodium nitrate, filtered, washed, and dried. Repeat 2 to 3 times.

[0040] (3) Template-free seed crystal method Beta is used as a carrier, and the carrier is pretreated by calcination, and the calcination temperature is 400-600°C.

[0041] (4) Impregnation method: impregnate a certain amount of Beta synthesized by the template-free seed crystal method after a certain amount of roasting in a certain amount of aqueous solution of noble metal active components, ultrasonic for 5 to 30 minutes, stirred for 1 to 4 hou...

Embodiment 1

[0047] The Beta molecular sieve is synthesized by the organic template-free seed crystal method, and the Beta molecular sieve is ion-exchanged with ammonium nitrate, then filtered, washed, and dried; repeating 2-3 times, and the obtained sample is roasted at 400°C. Immerse the roasted Beta molecular sieve in an aqueous solution containing chloroplatinic acid, ultrasonicate for 30 minutes, stir for 4 hours, and age overnight; stir the mixed solution with a glass rod at 120°C, evaporate the water in the mixed solution to make the active group Evenly load on the Beta molecular sieve, continue to dry at 150 ° C for 5 hours; then move to the muffle furnace under air conditions, and bake at 400 ° C for 5 hours to obtain a catalyst with platinum as the active component. The mass of the active component is The content is 0.1%. .

[0048] Before use, the catalyst is first placed in a hydrogen atmosphere, heat-treated at 200° C. for 4 hours, and then sieved into particles with a size o...

Embodiment 2

[0050] The rest are the same as in Example 1, except that the percentage of platinum removal is 0.2%, and the heat treatment is controlled at 400° C. for 1 hour.

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Abstract

The invention relates to the field of environmental catalysis and provides a catalyst for elimination of formaldehyde at a room temperature and a preparation method thereof. The catalyst comprises a Beta molecular sieve obtained by an organic template-free seed crystal method and a noble metal active component supported on a Beta molecular sieve. The noble metal active component comprises one or at least two of noble metals such as platinum, ruthenium, gold, silver and palladium. The catalyst has the advantages of simple use condition and convenient operation, can be effectively used for catalytic oxidation of the main pollutant formaldehyde in the room at the room temperature, does not produce by-products such as formic acid, carbon monoxide and methyl formate, has a formaldehyde conversion rate of 100%, a less catalyst use amount and excellent resistance to a high speed, does not need a specific light source, does not consume power and heat, saves energy and has excellent stability and moisture resistance.

Description

technical field [0001] The present invention relates to the field of environmental catalysis, in particular to a catalyst for catalytic oxidation of formaldehyde. The catalyst involved in the present invention has excellent activity in catalytic oxidation of formaldehyde, and can catalytically oxidize formaldehyde gas of different concentrations into carbon dioxide and water at room temperature . Background technique [0002] With the improvement of people's material and cultural level of life, interior decoration has become a fashion, but indoor air pollution is also becoming more and more serious. Formaldehyde is one of the most typical and serious pollutants in the indoor environment. As we all know, when people live in an environment where the concentration of formaldehyde gas exceeds the standard for a long time, it will cause great harm to human health, and sometimes even induce cancer. The concentration limit of formaldehyde pollutants in indoor air stipulated by my...

Claims

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Application Information

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IPC IPC(8): B01J29/74B01D53/86B01D53/72
CPCB01D53/8668B01D2257/708B01J29/7415
Inventor 孟祥举章凌肖丰收
Owner 苏州美吉科环保科技有限公司
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