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Method for preparing formaldehyde room temperature oxidation catalyst

An oxidation catalyst, room temperature technology, used in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of complex process, large particle size, poor dispersion, etc., and achieve low preparation cost and high activity. , the effect of small particle size

Inactive Publication Date: 2013-01-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of catalysts described in most patents such as CN200410102837.3, CN200910215887.5, CN200910098634.4, CN200910047376.7, CN200610011663.9 and CN200710121423.9 requires a high temperature (200~700°C) roasting process, therefore, High energy consumption, and noble metals may exist in the form of oxides, the particle size is large (usually > 2 nm), and the dispersion is poor, which will affect the improvement of activity; if you want to obtain 0-valent noble metals, you also need high temperature H 2 The reduction process complicates the process and increases the cost accordingly

Method used

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  • Method for preparing formaldehyde room temperature oxidation catalyst
  • Method for preparing formaldehyde room temperature oxidation catalyst
  • Method for preparing formaldehyde room temperature oxidation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of Formaldehyde Oxidation Catalyst at Room Temperature

[0025] (1) The carrier TiO 2 Disperse in water under the action of stirring, and then add chloroplatinic acid solution, where the added platinum is relative to TiO 2 The mass content of is 1wt%, continues to stir 1 hour;

[0026] (2) Add a mixture of 0.1 mol / L sodium borohydride and 0.5 mol / L sodium hydroxide to the solution in step (1) to reduce the precious metals to metal nanoparticles, sodium hydroxide, sodium borohydride and platinum The mol ratio is 25:5:1, and the pH value is between 9~10, continues to stir for 20 minutes;

[0027] (3) Heat, stir and evaporate the precious metal-deposited carrier obtained in step (2), the evaporation is carried out at 100°C, and the evaporation time is within 4 hours;

[0028] (4) The product obtained in step (3) was dried at 80°C for 12 hours, cooled and ground to obtain a formaldehyde room temperature oxidation catalyst.

[0029] The FETEM and XPS spectrog...

Embodiment 2

[0031] Preparation of Formaldehyde Oxidation Catalyst at Room Temperature

[0032] (1) The carrier TiO 2Disperse in water under the action of stirring, and then add chloroplatinic acid solution, where the added platinum is relative to TiO 2 The content of is 1 wt %, continue stirring for 1 hour;

[0033] (2) Add 0.1 mol / L sodium borohydride solution to the solution in step (1) to reduce the noble metal to metal nanoparticles. The molar ratio of sodium borohydride and platinum is 5:1, and the pH value is between 9 and 10. Between, continue stirring for 20 minutes;

[0034] (3) Heat, stir and evaporate the precious metal-deposited carrier obtained in step (2), the evaporation is carried out at 100°C, and the evaporation time is within 4 hours;

[0035] (4) The product obtained in step (3) was dried at 80°C for 12 hours, cooled and ground to obtain a formaldehyde room temperature oxidation catalyst.

Embodiment 3

[0037] Preparation of Formaldehyde Oxidation Catalyst at Room Temperature

[0038] (1) The carrier TiO 2 Disperse in water under the action of stirring, and then add chloroplatinic acid solution, where the added platinum is relative to TiO 2 The content of is 0.5wt%, continues to stir 1 hour;

[0039] (2) Add a mixture of 0.1 mol / L sodium borohydride and 0.5 mol / L sodium hydroxide to the solution in step (1) to reduce the precious metals to metal nanoparticles, sodium hydroxide, sodium borohydride and platinum The mol ratio is 25:5:1, and the pH value is between 9~10, continues to stir for 20 minutes;

[0040] (3) Heat, stir and evaporate the precious metal-deposited carrier obtained in step (2), the evaporation is carried out at 100°C, and the evaporation time is within 4 hours;

[0041] (4) The product obtained in step (3) was dried at 80°C for 12 hours, cooled and ground to obtain a formaldehyde room temperature oxidation catalyst.

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Abstract

The invention relates to a method for preparing formaldehyde room temperature oxidation catalyst. The method comprises the following steps: making porous inorganic oxide as a carrier; making sodium borohydride as reducing agent; making soluble hydroxide as additive; and drying the carrier including noble metal processed by carrier impregnation noble metal precursor-room temperature reduction-deposition so as to prepare catalyst. According to the invention, sodium borohydride reducing agent is added for one time at the room temperature, thus, the aperture of generated noble metal nano particle is smaller than that of particle prepared in a high-temperature burning / hydrogen reducing method; crystal particle is within 0.1-5nm; and dispersibility is good; the loading quantity of the noble metal is within 0.05-10wt%, preferably within 0.5-2%; corresponding aperture is within 0.5-3nm; prepared loading-type noble metal catalyst has very high oxidative activity to formaldehyde in air on a room temperature condition without illumination or heat; activity is not changed basically in repeated using procedures; and the method disclosed by the invention is characterized by simple compound line, easily-acquired raw material and is suitable for industrial production.

Description

technical field [0001] The invention relates to a preparation method of a formaldehyde room temperature oxidation catalyst, which belongs to the field of nano catalytic materials and indoor air purification. Background technique [0002] Human beings cannot live without the air, and they spend most of their time living and working indoors. Therefore, the air quality in indoor and closed spaces directly affects people's health and comfort. China is currently in a stage of rapid urbanization, and the area of ​​non-industrial housing built every year reaches hundreds of millions of square meters. Indoor air pollution (such as formaldehyde and other volatile organic compounds) caused by building materials and indoor items has become a major issue in urban areas in my country at this stage. The outstanding environmental issues that residents generally face and care about are related to the health and vital interests of hundreds of millions of people. Formaldehyde is one of the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J29/00A62D3/38A62D101/28
Inventor 余家国聂龙辉程蓓
Owner WUHAN UNIV OF TECH
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