Catalyst for oxidizing and eliminating formaldehyde at room temperature and preparation method thereof

A technology for eliminating formaldehyde and a catalyst, which is applied in the field of catalysts and preparations for eliminating formaldehyde by oxidation at room temperature. It can solve the problems of difficult wide-scale application, poor catalyst durability, and high precious metal content, and achieve easy promotion and use, high elimination rate, and cost reduction. Effect

Active Publication Date: 2014-12-24
BEIJING E TECHSTAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology has certain application value, it needs to use ultraviolet excitation light source, and the persistence of the catalyst is poor, so it is difficult to apply it on a large scale.
At present, there are also some reports about the elimination of formaldehyde by room temperatur...

Method used

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  • Catalyst for oxidizing and eliminating formaldehyde at room temperature and preparation method thereof
  • Catalyst for oxidizing and eliminating formaldehyde at room temperature and preparation method thereof
  • Catalyst for oxidizing and eliminating formaldehyde at room temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1-impregnation method prepares catalyst

[0038] Take a certain amount of precious metal precursor chloroplatinic acid and soluble carrier precursor ferric nitrate in proportion to dissolve in water, disperse 500g of insoluble carrier precursor aluminum oxide powder in the above aqueous solution, and use the auxiliary agent precursor sodium carbonate to adjust the pH value to 8.0, placed in an 80-degree water bath and stirred for 2 hours, then dried in a 100-degree oven for 2 hours, and then roasted for 2 hours under a nitrogen atmosphere at 300 degrees to obtain the desired catalyst.

[0039] It has been determined that the loading of the platinum component is 0.03% based on the conversion of the mass of the metal element. In the finally formed catalyst, the carrier is a composite of ferrous oxide and aluminum sesquioxide, and the additive component is sodium oxide.

Embodiment 2-10

[0040] Embodiment 2-10-preparation of catalyst by impregnation method

[0041] Using the same preparation process as in Example 1, only changing the type of precious metal precursor, the type of soluble carrier precursor, the type of insoluble carrier precursor, the type of auxiliary agent precursor, pH value, water bath time and water bath temperature, drying temperature and drying temperature , calcination time and calcination temperature, the impregnation method is used to prepare the catalyst, and the references for each reaction are shown in Table 1 and Table 2, and the detection parameters of the prepared catalyst are also shown in Table 1 and Table 2.

[0042] The reaction conditions and the result of table 1 embodiment 2-5

[0043]

[0044]

[0045] The reaction conditions and the result of table 2 embodiment 6-10

[0046]

[0047]

Embodiment 11-15

[0048] Embodiment 11-15---co-precipitation method prepares catalyst

[0049] Preparation Process:

[0050] S2.1, dissolving the selected noble metal active components, additive components and precursor soluble inorganic salts of carrier oxides in quantitative water according to a selected ratio to obtain a clear solution;

[0051] S2.2, adjust the pH of the solution obtained in S2.1, and adjust the pH to 8-12. After the precipitation is complete, filter and wash, take the filter cake and dry it in an oven at 100-150 degrees for 4-6 hours to obtain a semi-finished catalyst;

[0052] S2.3, put the catalyst semi-finished product obtained in S2.2 in a muffle furnace, and roast it in an air, nitrogen or argon atmosphere for 5-10 hours at a roasting temperature of 200-500 degrees to obtain a finished catalyst

[0053] In the above-mentioned preparation process, only the following relevant parameters are specifically limited for preparation. Refer to Table 3 for each reaction conditio...

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Abstract

The invention provides a catalyst for oxidizing and eliminating formaldehyde at room temperature and a preparation method thereof. The catalyst comprises a carrier, a noble metal active ingredient and an adjuvant, wherein the carrier is a compound or a mixture consisting of two or more than two oxides, the noble metal active ingredient at least comprises one of noble metal elements, including ruthenium, rhodium, palladium, platinum, gold or silver; the adjuvant at least comprises one of alkali metal elements, including lithium, sodium, potassium or cesium; the noble metal active ingredient is 0.01-0.099% of the total quality of the catalyst based on the noble metal element, and the adjuvant is 0.01-0.25% of the total quality of the catalyst based on the alkali metal element. Under the condition that the percentage of the used noble metal active ingredient is very low based on the total quality of the catalyst, the catalyst has a high elimination factor on formaldehyde, therefore the cost of the catalyst can be reduced, and catalyst is likely to be popularized and used.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for eliminating formaldehyde by oxidation at room temperature and a preparation method thereof. Background technique [0002] In recent years, the problem of air pollution has become increasingly serious, causing great harm to the environment and human health. Among them, formaldehyde is one of the most serious pollutants in indoor air. Its hazards are mainly reflected as follows: (1) Formaldehyde is a protoplasmic poison, which can be combined with protein. After inhaling high-concentration formaldehyde, severe irritation of the respiratory tract, edema, eye sting, headache and other symptoms will occur, and bronchial asthma may also occur. (2) Direct skin contact with formaldehyde can cause dermatitis, stains, and necrosis. (3) Frequent inhalation of a small amount of formaldehyde can cause chronic poisoning, mucous membrane hyperemia, skin irritation, allergic dermatitis keratosis an...

Claims

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Application Information

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IPC IPC(8): B01J23/54B01J23/89B01J23/656B01J23/66B01D53/96B01D53/72
Inventor 钱苏晋张文祥刘钢吴平郑彬
Owner BEIJING E TECHSTAR
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