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

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...

AI Technical Summary

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

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