Pd/TiO2/cotton fiber composite formaldehyde indoor temperature oxidation catalyst and preparation method thereof

Abstract

The invention relates to a Pd / TiO2 / cotton fiber composite formaldehyde indoor temperature oxidation catalyst and a preparation method thereof. The catalyst is prepared from a cotton fiber carrier, a TiO2 surface coating and a Pd active ingredient dispersed in the surface of the TiO2 coating; the cotton fiber carrier is absorbent cotton fiber; the TiO2 coating is a nano TiO2 coating of which the grain size ranges from 1nm to 10nm; the Pd active ingredient exists in a zero valence form, the grain size of the Pd active ingredient ranges from 1nm to 10nm and the loading capacity of the Pd active ingredient is 0.05-3wt%. The Pd / TiO2 / cotton fiber composite formaldehyde indoor temperature oxidation catalyst has the characteristics of graded middle and large hole structure, light weight and flexibility, Pd and the TiO2 coating as well as carrier cotton fiber are combined firmly, the active ingredient simple substance Pd is well dispersed in the surface of the TiO2 coating and is low in grain size, formaldehyde can be efficiently subjected to catalytic decomposition at indoor temperature, the use amount of noble metal is low, the air resistance is low, and the catalyst can be used in various air purifiers.

Description

technical field [0001] The invention belongs to the field of indoor air purification, in particular to a Pd / TiO 2 Cotton fiber composite formaldehyde room temperature oxidation catalyst and preparation method thereof. Background technique [0002] With the rapid development of urbanization in my country and the rise of decoration fever, indoor formaldehyde pollution is becoming more and more serious. It is one of the most important indoor pollutants 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, anion 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 ...

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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 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 evaporating 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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