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A kind of composite catalyst and method for catalyzing complete oxidation and elimination of formaldehyde

A composite catalyst and complete oxidation technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor dispersion of active components, large size of active components, unfavorable catalytic activity, etc., to achieve effective Good for dispersion, enhanced catalytic activity, good for reactivity and stability

Active Publication Date: 2022-01-11
DALIAN UNIV OF TECH
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Problems solved by technology

The acidity of molecular sieves has the effect of activating and transforming various gas molecules. However, in the field of formaldehyde oxidation and elimination, molecular sieves are generally only used as carrier materials to disperse active components, or porous materials are used for physical adsorption of formaldehyde, which is rarely fully beneficial. Its acidity catalyzes the reaction
In addition, compared with other porous carbon-nitrogen materials with large specific surface area, molecular sieves with relatively small specific surface area loaded with noble metals or metal oxides tend to cause poor dispersion of active components, and the size of active components is large, which is not conducive to the improvement of catalytic activity. promote

Method used

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  • A kind of composite catalyst and method for catalyzing complete oxidation and elimination of formaldehyde
  • A kind of composite catalyst and method for catalyzing complete oxidation and elimination of formaldehyde
  • A kind of composite catalyst and method for catalyzing complete oxidation and elimination of formaldehyde

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preparation example Construction

[0063] The preparation method of heteroatom-doped molecular sieves is similar to that of CHA and AEI topology molecular sieves, only a certain amount of corresponding metal salts are added to the synthetic raw materials. According to M:SiO 2 :Al 2 o 3 :H 3 PO 4 :R:H 2 O=0.001-0.1:4:16:32:55:150 Weigh the raw materials, wherein the metal element type of M is the same as the metal type of the above-mentioned ion exchange, and R is a template agent.

[0064] Mix the metal salt precursor, aluminum sulfate and sodium hydroxide solution, then add silica sol, phosphoric acid, TEA(R); deionized water, stir for 1 h to obtain a homogeneous initial gel, and then transfer it to a high-pressure synthesis kettle , high-temperature static crystallization, quenching, washing, and drying to obtain molecular sieve samples. The synthesis and properties of partially heteroatom-doped molecular sieves with CHA and AEI topological structures are shown in Table 3.

[0065] Table 3. Preparation...

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Abstract

The invention relates to the technical field of environmental catalysis and aims to provide a composite catalyst and a method for catalyzing the oxidation and elimination of formaldehyde. It takes formaldehyde and air as the reaction raw materials, and carries out the conversion reaction on a fixed bed or a moving bed. The catalyst is a composite catalyst, which is composed of component I and component II by mechanical mixing. The active ingredient of component I is Molecular sieve with medium-strong acid sites, the active ingredient of component II is a noble metal catalyst; the weight ratio of component I to component II is in the range of 0.01-20, and the axial distance between the particles of component I and component II is between Between 50nm‑40mm range. The composite catalyst has high catalytic formaldehyde oxidation activity at low temperature, and can utilize O in the air in the temperature range of 20-80°C 2 Molecules oxidize formaldehyde in the atmosphere to non-toxic and harmless CO 2 and H 2 O. The formaldehyde concentration in the air after treatment is lower than the indoor concentration required by the national environmental protection.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis, and in particular relates to a bifunctional composite catalyst and its catalytic formaldehyde complete oxidation to generate CO 2 and H 2 O's method. Background technique [0002] Formaldehyde produced by industrial development and interior decoration is a serious hazard to the environment and the health of the population, and it is urgent to develop catalysts for the efficient elimination of formaldehyde. Noble metal (Pt, Pd, Ru, Rh, Au, Ag, etc.)-based catalysts exhibit excellent low-temperature catalytic formaldehyde oxidation performance, but the high cost and limited reserves of this type of catalyst limit the large-scale application of the catalyst. In addition, the loading of noble metal catalysts needs to be further reduced, and the stability needs to be improved. [0003] As one of the important components of solid acid materials, molecular sieves are widely used in va...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48B01J29/46B01J35/10B01D53/86B01D53/72
CPCB01J29/48B01J29/46B01J35/1023B01J35/1028B01D53/8668
Inventor 曲振平李娜黄彬
Owner DALIAN UNIV OF TECH
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