Flexible platinum formaldehyde room-temperature oxidation catalyst and preparation method thereof

Abstract

The invention relates to a flexible platinum formaldehyde room-temperature oxidation catalyst and a preparation method thereof, in particular to a Pt / TiO2 / cotton fiber flexible composite formaldehyde room-temperature oxidation catalyst and a preparation method thereof. The catalyst comprises a degreased cotton fiber carrier, a nano TiO2 surface coating and Pt active ingredients dispersed on the surface of the TiO2 coating, wherein the Pt active ingredients exist in a zero-valence form, grain size ranges from 1nm to 10nm, and loading capacity is 0.05-2wt%. The Pt / TiO2 / cotton fiber flexible composite formaldehyde room-temperature oxidation catalyst has the advantages of hierarchical mesoporous-macroporous structure, light weight and flexibility, Pt is combined firmly with the TiO2 coating and carrier cotton fiber, elemental Pt of the active ingredients is high in dispersity on the surface of the TiO2 coating and small in grain size and can catalytically decompose formaldehyde efficiently at room temperature, noble metal Pt is low in consumption and air resistance, and the catalyst is suitable for using used in various air purifiers.

Description

technical field [0001] The present invention relates to a kind of Pt / TiO 2 The invention discloses a catalyst for room-temperature oxidation of cotton fiber composite formaldehyde, which belongs to the field of indoor air purification. Background technique [0002] Formaldehyde is one of the most important pollutants in indoor air and has great toxicity. At present, eliminating indoor formaldehyde pollution has become a hot research topic in the field of environmental governance. Among the existing formaldehyde removal methods, the room temperature catalytic oxidation method is better than other methods (adsorption method, absorption method, negative ion oxidation method, ozone catalytic oxidation method, biological filtration / plant purification method, low temperature plasma method and photocatalytic oxidation method, etc.) It has unique advantages, it can be carried out under normal temperature and pressure, high formaldehyde removal efficiency, simple equipment, long li...

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Problems solved by technology

However, from a practical point of view, the catalysts prepared in the above published patents are mostly made of ordinary porous inorganic nanoparticles (such as titanium dioxide, aluminum oxide, molecular sieves, cerium oxide and silicon oxide, etc.) as carriers. Filled purification equipment needs to be pressed into tablets or further loaded on other bulky carriers before it can be used, which will complicate the process, and there are problems such as reduced catalytic activity, large air resistance and easy fall off of the catalyst

In order to overcome the above defects, the patent CN201410015867.4 TiO prepared by electrospinning 2 As a carrier, the supported noble metal / TiO was prepared by impregnation~room temperature reduction~deposition 2 Composite catalyst, the newly prepared catalyst does not need to be reloaded, and has high catalytic activity and small air resistance, but the catalyst is based on inorganic TiO 2 The nanofiber substrate is therefore brittle, and the brittleness increases with the decrease of the fiber diameter, which will cause it to be broken continuously during use, and the original fiber structure will be gradually destroyed, so that the air resistance will gradually increase

Moreover, in the subsequent process of noble metal loading, a process of heating and evaporation is required to remove residual chloride ions (from the noble metal precursor), so the process is still relatively complicated

Meanwhile, TiO was prepared by electrospinning 2 Fiber still has problems such as high cost, high equipment requirements, and difficulties in large-scale production.

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