Composite catalyst and method for catalyzing complete oxidation and elimination of formaldehyde via composite catalyst

Abstract

The invention relates to the technical field of environmental catalysis, and aims to provide a composite catalyst and a method for catalyzing complete oxidation and elimination of formaldehyde via the composite catalyst. According to the invention, formaldehyde and air are used as reaction raw materials and are subjected to a conversion reaction on a fixed bed or a moving bed; and a used catalyst is the composite catalyst and is formed by compounding a component I and a component II in a mechanical mixing mode, wherein the active component of the component I is a molecular sieve with medium-strong acid sites, the active component of the component II is a noble metal catalyst, a weight ratio of the component I to the component II is in a range of 0.01-20, and the axis distance between particles of the component I and the component II is in a range of 50 nm-40 mm. The composite catalyst is high in the activity of low-temperature catalysis of formaldehyde oxidation, and can oxidize formaldehyde in the atmospheric environment into non-toxic and harmless CO2 and H2O via O2 molecules in air within a temperature range of 20-80 DEG C; and the concentration of formaldehyde in the treated air is lower than a room concentration required by national environmental protection in China.

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

Images