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Formaldehyde degradation catalyst and preparation method thereof

A formaldehyde degradation and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems that need to be further improved, to avoid secondary pollutants, strengthen water resistance, and specific surface area big effect

Inactive Publication Date: 2016-07-13
NINGBO XIAYUAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the application for invention with the patent number CN104353465A, a catalyst with a core-shell structure for the catalytic oxidation of formaldehyde prepared by co-current co-precipitation technology is disclosed. 3 o 4 As the core, with CeO 2 As the shell, formaldehyde can be completely catalytically converted at room temperature, but the CO of the catalyst 2 The selectivity is only about 10% at room temperature, and its catalytic performance needs to be further improved

Method used

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Examples

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preparation example Construction

[0030] A kind of preparation method of formaldehyde degradation catalyst, it comprises steps:

[0031] S100 Prepare a porous matrix, dissolve 2,2'-bipyridine and bis-(1,5-cyclooctadiene) nickel in dry N,N-dimethylformamide to obtain a mixed solution, add 1 at intervals, 5-Cyclooctadiene and 2,4,6-tri-p-bromophenyl-[1,3,5]triazine were reacted in the mixed solution to obtain a dark purple mixture. After the mixture was cooled, concentrated hydrochloric acid was added, filtered, Washing, standing and supercritical extraction to prepare covalent organic porous polymer COP-4; and

[0032] S200 supergravity loading active components, adding the porous matrix to the dimethylformamide solution containing gold precursor and platinum precursor, placing it in a supergravity packed bed and treating it under the condition of 100-250g supergravity 2 ~5 hours to prepare a catalyst sample; and

[0033] S300 calcination combines the active component and the porous substrate. The catalyst sa...

Embodiment 1

[0051] First, 16g of 2,2'-bipyridine and 28g of bis-(1,5-cyclooctadiene)nickel were added to 500mL of dry N,N-dimethylformamide solution and stirred rapidly at a temperature of 80°C until the sample is completely dissolved. Then 12.5 mL of 1,5-cyclooctadiene was added to the above mixture and stirred well. Then 11 g of 2,4,6-tri-p-bromophenyl-[1,3,5]triazine was added to the above mixed solution, and reacted at 105° C. for 12 h to finally obtain a dark purple mixture. After the mixture was cooled down, concentrated hydrochloric acid was added thereto until its color changed to transparent green. The mixture was then filtered and washed with chloroform, tetrahydrofuran and water, respectively. The samples obtained after filtration and washing were placed in absolute ethanol and left to stand for 3 days. The samples were then transferred to supercritical CO 2 In the extraction device, inject CO at a rate of 50-100mL / min 2 , the pressure was maintained at 1300psi, then the t...

Embodiment 2

[0055] The preparation process of COP-4 is the same as that of Example 1, 5.0gCOP-4 is added in the 200mLDMF solution containing 0.80mmol / L chloroauric acid, then it is placed in the supergravity packed bed and treated under the supergravity condition of 250g for 2h . Subsequently, the obtained samples were dried at 120°C for 6 h, and placed in N at 400°C. 2 Calcination treatment under atmosphere for 4h, followed by H at 400°C 2 Reduction treatment under atmosphere for 3h. Finally, the loaded amount of Au element was determined to be 0.3wt% by ICP-MS. Finally, after tableting, crushing and sieving, a catalyst of 40 mesh to 60 mesh was taken for activity evaluation.

[0056] The experimental results show that at room temperature of 25°C, the degradation rate of formaldehyde is maintained at about 85.6%. 2 The selectivity is maintained at 90%, and some CO is generated.

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Abstract

The invention provides a formaldehyde degradation catalyst and a preparation method thereof. The catalyst is formed by compounding 0.1 to 0.5 percent by mass of nanogold and 0.1 to 0.5 percent by mass of nano platinum which are loaded into a porous matrix, wherein the porous matrix is a covalent organic porous polymer COP-4. By taking the covalent organic polymer as a carrier and taking precious metal, namely the nanogold and the nano platinum as active components, the active components are highly dispersed on a porous carrier to efficiently catalyze the degradation of formaldehyde while adsorbing the formaldehyde at room temperature, and therefore the air detergency to the formaldehyde is effectively improved.

Description

technical field [0001] The invention relates to the field of air purification materials, in particular to a porous composite catalyst suitable for absorbing formaldehyde gas and performing catalytic oxidation degradation and a preparation method thereof. Background technique [0002] In recent years, with the improvement of people's material and cultural level, interior decoration has become fashionable, 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. It can be continuously and slowly released from the materials required for interior decoration and decoration, with a cycle of about 15 years, and it also has strong carcinogenic and cancer-promoting effects. . The national standard "Indoor Air Quality Standard" (GB / T18883-2002) promulgated by my country stipulates that the concentration limit of formaldehyde pollutants in indoor air is 0.08mg / m 3 , about 0.06ppm at room...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01J31/06B01D53/86B01D53/72
CPCB01J31/1691B01D53/8668B01D2257/70B01D2258/06B01J31/06B01J31/1815B01J31/2295B01J2531/0241B01J2531/847
Inventor 王文群
Owner NINGBO XIAYUAN TECH
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