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Formaldehyde room temperature elimination catalyst

A technology for eliminating formaldehyde and catalysts, applied in the field of ceria-loaded nano-palladium catalysts, achieving the effect of simple use conditions and convenient operation

Active Publication Date: 2015-06-24
河南富氧环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common formaldehyde catalytic oxidation catalysts need to be heated to achieve the complete conversion of formaldehyde, and there are few catalysts that can achieve the complete oxidation of high-concentration formaldehyde at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0014] (1) Preparation of ceria nanocubes

[0015] Weigh 1.0g Ce(NO 3 ) 3 ·6H 2 O (99.5%) was dissolved in 15ml of water, 25ml of aqueous solution containing 12g of NaOH was added and stirred vigorously for ten minutes, then the mixed system was transferred to a 50ml reactor, and reacted at 200°C for 24 hours, then naturally cooled to room temperature. The resulting precipitate was suction-filtered, washed with water, washed with alcohol, and then dried at 50° C. overnight to obtain a ceria nanocube carrier.

[0016] (2) Nano palladium loaded on ceria

[0017] Weigh 1.0g of the above carrier, disperse it in 400ml deionized water, add 0.0167g PdCl 2 , stirred to PdCl 2 After fully dissolving, adjust the pH to 7 with 0.5mol / L NaOH aqueous solution, and after stirring for ten minutes, add 5ml of 0.15mol / L NaBH 4 After the aqueous solution was stirred for half an hour, it was suction-filtered, and the obtained off-white precipitate was washed with water, washed with alcohol,...

Embodiment example 2

[0021] (1) Preparation of ceria nanocubes

[0022] Weigh 1.0g Ce(NO 3 ) 3 ·6H 2 O (99.5%) was dissolved in 15ml of water, 25ml of aqueous solution containing 20g of NaOH was added and stirred vigorously for ten minutes, then the mixed system was transferred to a 50ml reactor, and reacted at 150°C for 20 hours, then naturally cooled to room temperature. The resulting precipitate was suction-filtered, washed with water, washed with alcohol, and then dried at 50° C. overnight to obtain a ceria nanocube carrier.

[0023] (2) Nano palladium loaded on ceria

[0024] Same as the step (2) of the implementation case 1.

[0025] (3) Evaluation of catalytic performance

[0026] Get 0.1g of ceria-supported palladium catalyst and place it in a tubular fixed-bed reactor for experiments. The experimental conditions are as follows: 20% oxygen, 80% nitrogen, formaldehyde gas is produced by a formaldehyde gas generator, and the formaldehyde content is controlled to be 400ppm. The humidity...

Embodiment example 3

[0028] (1) Preparation of ceria nanocubes

[0029] Same as the step (1) of the implementation case 1.

[0030] (2) Nano palladium loaded on ceria

[0031] Weigh 1.0g of the above carrier, disperse in 400ml deionized water, add 0.0433gPd(NO 3 ) 3 , stirred until Pd(NO 3 ) 3 After fully dissolved, adjust the pH to 9 with 0.5mol / L NaOH aqueous solution, and after stirring for ten minutes, add 5ml of 0.15mol / L NaBH 4 After the aqueous solution was stirred for half an hour, it was suction-filtered, and the obtained off-white precipitate was washed with water, washed with alcohol, and then dried at 50°C overnight to obtain a ceria-supported palladium catalyst.

[0032] (3) Evaluation of catalytic performance

[0033] Same as the step (3) of the implementation case 1, the conversion rate of formaldehyde is 100% as detected by GC-FID.

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Abstract

The invention relates to a formaldehyde room temperature purification nano-palladium-loaded nano cerium oxide catalyst. A nano cerium oxide cubic block is used as a carrier, and the surface of the carrier is loaded with the nano palladium by deposition-precipitation method to obtain the loaded type catalyst. The formaldehyde room temperature purification loaded type catalyst can convert most or all of the formaldehyde under the condition of room temperature into carbon dioxide and water without production of by-product of formic acid, carbon monoxide, and the like, and the formaldehyde conversion rate is up to 100%.

Description

technical field [0001] The invention particularly relates to a ceria-loaded nano-palladium catalyst used for purifying formaldehyde at room temperature. Background technique [0002] For newly renovated houses, serious indoor air pollution has become one of the most concerned issues. Among the many pollutants, formaldehyde is a typical and serious gaseous organic pollutant. Long-term exposure to an environment with formaldehyde can irritate the eyes, nose, and throat of a person, leading to severe allergic symptoms such as rashes. In addition, formaldehyde is also considered a potential carcinogen. According to the national standard of the People's Republic of China "Hygienic Standards for Formaldehyde in Indoor Air", the maximum allowable concentration of formaldehyde in indoor air is 0.08 mg / m3. More than sixty percent. Therefore, how to eliminate indoor formaldehyde pollution has become an important issue for improving people's living environment. [0003] Conventiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/72B01D53/86
Inventor 周克斌谭弘毅
Owner 河南富氧环保科技有限公司
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