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Porous TiO2 fiber loaded noble metal formaldehyde room-temperature oxidation catalyst and preparation method thereof

A technology for oxidizing catalysts and precious metals, which is applied in the field of indoor air purification, can solve the problems of easy detachment of catalysts, large air resistance, complicated process, etc., and achieve the effects of small air resistance, good dispersion and high catalytic activity

Active Publication Date: 2014-04-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from a practical point of view, the catalytic activity of the catalysts prepared in the above published patents needs to be further improved, and they are all made of ordinary porous inorganic nanoparticles (such as titanium dioxide, aluminum oxide, molecular sieve, cerium oxide and silicon oxide, etc.) It is prepared as a carrier. If these catalysts are applied to packed purification equipment, they need to be pressed into tablets or further loaded on other bulky carriers before they can be used. This will complicate the process, and there will be problems such as large air resistance and easy falling off of the catalyst.

Method used

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  • Porous TiO2 fiber loaded noble metal formaldehyde room-temperature oxidation catalyst and preparation method thereof
  • Porous TiO2 fiber loaded noble metal formaldehyde room-temperature oxidation catalyst and preparation method thereof
  • Porous TiO2 fiber loaded noble metal formaldehyde room-temperature oxidation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) First dissolve 0.5g of polyvinylpyrrolidone in absolute ethanol to prepare an absolute ethanol solution of polyvinylpyrrolidone with a mass content of 6wt%. Under stirring, add glacial acetic acid as inhibitor and CTAB and urea to make Pore ​​agent, then add tetraisopropyl titanate, continue to stir for 12h, wherein the molar ratio of absolute ethanol, CTAB, glacial acetic acid, urea and tetraisopropyl titanate is 1:0.05:0.29:0.1:0.03; add Electrospinning is carried out in the electrospinning device, the flow rate of the electrospinning solution is 1.5mL / h, the diameter of the spinning needle is 0.75mm, and the working voltage intensity is 1.3kV / cm to obtain TiO 2 / Polymer composite fiber;

[0029] (2) The TiO obtained in step (1) 2 / Porous TiO is obtained by placing the polymer composite fiber in the air for 2 hours and then roasting at a temperature of 500°C and a roasting time of 3 hours 2 fiber.

[0030] (3) The porous TiO obtained in step (2) 2 The fiber is disperse...

Embodiment 2

[0033] Example 2 Preparation of formaldehyde room temperature oxidation catalyst

[0034] (1) First dissolve 0.5g of polyvinylpyrrolidone in absolute ethanol to prepare an absolute ethanol solution of polyvinylpyrrolidone with a mass content of 6wt%. Under stirring, add glacial acetic acid as inhibitor and CTAB and urea to make Pore ​​agent, then add tetraisopropyl titanate, continue to stir for 24h, wherein the molar ratio of absolute ethanol, CTAB, glacial acetic acid, urea and tetraisopropyl titanate = 1:0.05:0.29:0.1:0.03; add Electrospinning is carried out in the electrospinning device, the flow rate of the electrospinning solution is 1.5mL / h, the diameter of the spinning needle is 0.75mm, and the working voltage intensity is 1.3kV / cm to obtain TiO 2 / Polymer composite fiber;

[0035] (2) The TiO obtained in step (1) 2 / Porous TiO is obtained by placing the polymer composite fiber in the air for 2 hours and then roasting at a temperature of 600℃ and a roasting time of 2 hours....

Embodiment 3

[0037] Example 3 Preparation of formaldehyde room temperature oxidation catalyst

[0038] (1) First dissolve 0.5g of polyvinylpyrrolidone in absolute ethanol to prepare an absolute ethanol solution of polyvinylpyrrolidone with a mass content of 6wt%. Under stirring, add glacial acetic acid as inhibitor and CTAB and urea to make Pore ​​agent, then add tetraisopropyl titanate, continue to stir for 18h, wherein the molar ratio of absolute ethanol, CTAB, glacial acetic acid, urea and tetraisopropyl titanate = 1:0.1:0.4:0.1:0.03; add Electrospinning is carried out in the electrospinning device, the flow rate of the electrospinning solution is 2.5mL / h, the diameter of the spinning needle is 1.25mm, and the working voltage intensity is 1.8kV / cm to obtain TiO 2 / Polymer composite fiber;

[0039] (2) The TiO obtained in step (1) 2 / Porous TiO is obtained by placing the polymer composite fiber in the air for 2 hours and then roasting at a temperature of 450°C and a roasting time of 6 hours 2...

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Abstract

The invention relates to a porous TiO2 fiber loaded noble metal formaldehyde room-temperature oxidation catalyst and a preparation method thereof. The porous TiO2 fiber loaded noble metal formaldehyde room-temperature oxidation catalyst comprises a porous TiO2 fiber carrier and noble metal active components which are dispersed in the carrier; the porous TiO2 fiber carrier is of a felt shape, and is formed by weaving the TiO2 fibers with the length of a plurality of microns; irregular pores with the pore diameter range of 2-1000nm are formed in the TiO2 fibers so as to form a graduation mesoporous-macroporous structure; and the noble metal exists in a zero valence form with the particle size range of 0.5-3nm. The porous TiO2 fiber loaded noble metal formaldehyde room-temperature oxidation catalyst provided by the invention is of a graduation mesoporous-macroporous structure; the active component noble metal has good dispersibility in the carrier, has the particle size of 1-3nm, and is zero valence; and formaldehyde can be subjected to catalytic decomposition at room temperature, and the catalytic activity is good, and the using quantity is less.

Description

Technical field [0001] The invention relates to a porous TiO 2 A fiber-loaded noble metal formaldehyde room temperature oxidation catalyst and a preparation method thereof belong to the field of indoor air purification. Background technique [0002] Formaldehyde is one of the most serious indoor pollutants and has high toxicity. Therefore, eliminating indoor formaldehyde pollution has become an urgent task to improve people's living environment. At present, there are many methods to control indoor formaldehyde pollution, such as adsorption, absorption, negative ion oxidation, ozone catalytic oxidation, biological filtration / plant purification, low-temperature plasma, catalytic oxidation, etc. The catalytic oxidation method includes photocatalytic oxidation and thermal catalytic oxidation. Photocatalytic oxidation method is based on TiO 2 Nano powder or film is used as a photocatalyst to catalyze and oxidize formaldehyde under light. The preparation method is complicated, the te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/52B01D53/86B01D53/72
Inventor 余家国聂龙辉程蓓
Owner WUHAN UNIV OF TECH
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