Method for preparing monatomic catalyst capable of degrading formaldehyde under oxygen condition and at normal temperature

A catalyst and conditional technology, which is applied in the field of single-atom catalyst preparation for catalytic oxidation of formaldehyde at room temperature, can solve the problems of poor stability, affecting catalytic activity, and easy deactivation, and achieve stable performance, strong anti-poisoning ability, and low price.

Pending Publication Date: 2019-04-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Single-atom catalysts have high surface energy and strong single-atom mobility. They tend to aggregate during the catalytic reaction and affect catalytic activity. At present, existing s...

Method used

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  • Method for preparing monatomic catalyst capable of degrading formaldehyde under oxygen condition and at normal temperature
  • Method for preparing monatomic catalyst capable of degrading formaldehyde under oxygen condition and at normal temperature

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preparation example Construction

[0017] Based on the above mechanism, a method for preparing a single-atom catalyst for degrading formaldehyde at room temperature under an oxygen condition of the present invention comprises the following steps:

[0018] Step 1. TiO with a diameter of 40-60nm 2 The nano powder is placed in a tube furnace, and the gas flow rate is 50-100mL / min into the tube furnace. 2 and N 2 gas mixture, the H 2 and N 2 The volume ratio is 1:(18-20), and the temperature of the tube furnace is adjusted to 200-400°C for heat treatment of TiO 2 Nanopowder 1.5-2.5h to obtain defective TiO with surface oxygen vacancies 2 carrier;

[0019] Step 2, at first, will be 1: (45-55) described defective TiO with deionized water mass ratio 2 Suspend the carrier in deionized water, stir with a glass rod for 12-16min, add 0.8-1.2mol / L ammonium carbonate solution into the suspension to obtain solution A;

[0020] Then, the HAuCl with deionized water mass ratio of 1: (9.2-11.7) 4 4H 2 O was dissolved in...

Embodiment 1

[0024] Step 1, TiO with a diameter of 40nm 2 The nano-powder was placed in a tube furnace, and H 2 and N 2 gas mixture, the H 2 and N 2 The volume ratio is 1:18, and the temperature of the tube furnace is adjusted to 200°C for heat treatment of TiO 2 Nanopowders for 1.5h to obtain defective TiO with surface oxygen vacancies 2 carrier;

[0025] Step 2, first, the described defective TiO that is 1:45 with deionized water mass ratio 2 The carrier was suspended in deionized water, stirred with a glass rod for 12 minutes, and 0.8 mol / L ammonium carbonate solution was added to the suspension to obtain solution A;

[0026] Then, HAuCl with a mass ratio of 1:9.2 to deionized water 4 4H2 O was dissolved in deionized water, and then added dropwise to solution A to obtain solution B. In said solution B, ammonium carbonate and HAuCl 4 4H 2 The ratio of the amount of O species is 2:1, the defective TiO 2 Carrier and HAuCl 4 4H 2 The mass ratio of O is 10:1;

[0027] Finally, t...

Embodiment 2

[0031] Step 1, TiO with a diameter of 50nm 2 The nano-powder is placed in a tube furnace, and the gas flow rate is 75mL / min into the tube furnace. 2 and N 2 gas mixture, the H 2 and N 2 The volume ratio is 1:19, and the temperature of the tube furnace is adjusted to 300°C for heat treatment of TiO 2 Nanopowder 2h to obtain defective TiO with surface oxygen vacancies 2 carrier;

[0032] Step 2, first, the described defective TiO that will be 1:50 with deionized water mass ratio 2 The carrier was suspended in deionized water, stirred with a glass rod for 15 minutes, and 1mol / L ammonium carbonate solution was added to the suspension to obtain solution A;

[0033] Then, HAuCl with a mass ratio of 1:10.5 to deionized water 4 4H 2 O was dissolved in deionized water, and then added dropwise to solution A to obtain solution B. In said solution B, ammonium carbonate and HAuCl 4 4H 2 The ratio of the amount of O species is 2.5:1, the defective TiO 2 Carrier and HAuCl 4 4H 2...

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Abstract

The invention discloses a method for preparing a monatomic catalyst capable of degrading formaldehyde under an oxygen condition and at normal temperature. The method comprises the following steps of 1, conducting hydrogen gas reduction to obtain a defective TiO2 carrier with surface oxygen vacancy; 2, utilizing a deposition-precipitation method for preparing a precipitate Au/defective TiO2; 3, conducting drying and calcining to obtain the final product monatomic Au/defective TiO2 catalyst. Compared with an existing catalyst, the method has the advantages that the catalyst Au/defective TiO2 ishigh in efficiency and long in service life, and the monatomic catalyst has strong poison tolerance, and has great advantages in a formaldehyde degrading reaction; the Au/defective TiO2 monatomic catalyst is adopted, dispersion of metal atoms is facilitated through the construction of defects, and normal-temperature catalytic oxidation under the O2 condition and without the assistance of ozone canbe achieved.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a single-atom catalyst for catalytically oxidizing formaldehyde at room temperature. Background technique [0002] Aldehydes are one of the most abundant components of total reactive VOCs in the atmosphere, and formaldehyde is the most common type of aldehyde VOCs, which is one of the main sources of new free radicals that control ozone formation. Formaldehyde mainly originates from the oxidative degradation of VOCs (alcohols and other hydrocarbons) in multiple processes. Formaldehyde is a priority pollutant in both indoor and outdoor air, which is toxic and irritating. [0003] Activated carbon, alumina and other adsorbents can effectively remove HCHO, but the adsorption is usually limited by the adsorption capacity. Normal temperature catalytic oxidation technology is the most effective technology for VOCs degradation. This technology usually uses met...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01D53/86B01D53/72
CPCB01D53/8668B01J23/52
Inventor 丁辉郝子全
Owner TIANJIN UNIV
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