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Preparation method of rare earth modified supported noble metal monolithic catalyst for elimination of formaldehyde at room temperature

An integral catalyst, rare earth modification technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as untested removal of formaldehyde, and achieve improved catalytic Formaldehyde oxidation activity, simple and convenient preparation process, and the effect of improving the degree of dispersion

Inactive Publication Date: 2016-05-11
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] None of the above and other patents related to catalytic oxidation of formaldehyde uses rare earth-modified inorganic oxide-supported noble metal monolithic catalysts for catalytic oxidation of low-concentration indoor formaldehyde, and their initial concentration of formaldehyde in the formaldehyde activity test is between tens to hundreds of ppm. time, not tested to remove low-concentration formaldehyde in the actual indoor environment

Method used

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  • Preparation method of rare earth modified supported noble metal monolithic catalyst for elimination of formaldehyde at room temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Weigh a certain amount of La(NO 3 ) 3 , Ce(NO 3 ) 3 or Y(NO 3 ) 3 Rare earth salts, TiO 2 , adding a certain proportion of binder Al 2 o 3 and Al(NO 3 ) 3 , deionized water to form a mixed solution, and stirred in a ball mill at a medium speed for 24 hours to obtain a slurry with a certain concentration. Immerse the honeycomb ceramics in the prepared slurry, take it out after 2 minutes of immersion, and blow out the residual liquid in the channel. After being dried in the shade, it was dried at 120°C for 2h, and then fired at 300°C and 500°C in an air atmosphere for 1h respectively to obtain rare earth-modified nano-TiO 2 Honeycomb ceramics, during which the weight of honeycomb ceramics increases by 10%-20%.

Embodiment 2

[0030] The rare earth modified nano TiO obtained in Example 1 is coated with 2 The honeycomb ceramics were impregnated in Pt(NH 3 ) 4 (NO 3 ) 2 In the aqueous solution, adjust the concentration of the Pt precursor in the solution so as to control the content of noble metals such as Pt in the monolithic catalyst to account for 0.01-0.5% of the total weight, and finally treat the monolithic catalyst supporting the Pt precursor at 400 ° C in a hydrogen atmosphere for 4 hours.

Embodiment 3

[0032] The rare earth modified nano TiO obtained in Example 1 is coated with 2 The honeycomb ceramics were impregnated in Pd(NH 3 ) 4 (NO 3 ) 2 In the aqueous solution, adjust the concentration of the Pt precursor in the solution so as to control the content of noble metals such as Pd in ​​the monolithic catalyst to account for 0.01-0.5% of the total weight, and finally treat the monolithic catalyst supporting the Pd precursor at 400 ° C in a hydrogen atmosphere for 4 hours.

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Abstract

The invention relates to a preparation method of a rare-earth modification load type precious metal monolithic catalyst for removing formaldehyde at room temperature. According to the preparation method, the honeycomb ceramics of load rare-earth modification inorganic oxide such as titanium oxide, aluminum oxide, calcium oxide and magnesium oxide is adopted as a carrier, and metal nanoparticles such as Pt, Pd, Ag, Au, Rh and Ru with different contents are respectively loaded on the honeycomb ceramics. The preparation method has the characteristics that stable activity is maintained within a long time and a by-product is not produced under the condition that additional energy such as heat, light and electricity or an auxiliary means is not needed, so that the rare-earth modification load type precious metal monolithic catalyst is suitable for efficiently removing the formaldehyde emission pollution of a closed or semi-closed space of the indoor home environment, the work space and the like.

Description

technical field [0001] The patent of this invention relates to the preparation and application of an efficient catalyst for eliminating formaldehyde in ambient air at room temperature, that is, to a method for completely oxidizing low-concentration formaldehyde in the air into non-toxic and harmless CO at room temperature and ambient humidity. 2 and H 2 The catalyst of O is suitable for removing formaldehyde emission pollution in closed and semi-enclosed spaces such as indoor home environments and work spaces, and belongs to the technical fields of catalytic materials, environmental catalysis and environmental protection. technical background [0002] With the continuous development of the national economy and the continuous improvement of people's living standards, interior decoration is becoming more and more luxurious and fashionable. But what followed was that indoor formaldehyde pollution became more and more serious. Although many people will pay attention to choosin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01D53/86B01D53/72
Inventor 王翔彭洪根应家伟
Owner NANCHANG UNIV