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Catalyzation method for simultaneously removing aldehydes and benzene-series pollutants at room temperature

A technology for benzene series and pollutants, applied in the field of indoor air purification, can solve the problems of rapid failure of adsorption technology, difficult regeneration, cumbersome operation of composite technology, etc., and achieve the effects of short time, low energy consumption and broad application prospects

Inactive Publication Date: 2014-04-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a new method for the simultaneous removal of indoor air pollutants aldehydes and benzene series, to overcome the shortcomings of the existing adsorption technology, such as rapid failure, difficult regeneration and cumbersome operation of the composite technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A micro-fixed-bed reactor packed with Pd / HZSM-5 (Si / Al=500) catalyst: Pd / HZSM-5 (Si / Al=500) particles were packed in a quartz reaction tube. Under normal temperature and pressure, the simulated indoor polluted air with a formaldehyde concentration of 80ppm, a benzene concentration of 10ppm and a water content of 1.564% flows through the fixed-bed microreactor at a flow rate of 100ml / min. First, formaldehyde is completely oxidized to CO during storage at room temperature 2 and H 2 O, benzene is stored on the catalyst in the form of adsorption. CO at the outlet of the storage stage reactor 2 The concentration was kept at 80ppm, and the concentration of formaldehyde and benzene was not detected; after storage for 300min, the temperature was raised to 200℃ at a rate of 10℃ / min, and the benzene molecules stored on Pd / HZSM-5 (Si / Al=500) were completely oxidized for CO 2 and H 2 O, the benzene molecule was completely oxidized and the Pd / HZSM-5 (Si / Al=500) catalyst was reg...

Embodiment 2

[0019] A micro-fixed-bed reactor packed with Os / HY catalyst: Pt / HY particles were packed in a quartz reaction tube. Under normal temperature and pressure, the simulated indoor polluted air containing formaldehyde concentration of 75ppm and benzene concentration of 20ppm and water content of 1.564% flows through the fixed bed microreactor at a flow rate of 100ml / min. First, formaldehyde is completely oxidized to CO during storage at room temperature 2 and H 2 O, benzene is stored on the catalyst in the form of adsorption. CO at the outlet of the storage stage reactor 2 The concentration was kept at 80ppm, and no formaldehyde and benzene concentrations were detected; after storage for 280min, the temperature was raised to 150°C at a rate of 10°C / min, and the benzene molecules stored on Pt / HY were completely oxidized to CO 2 and H 2 O, the benzene molecule is completely oxidized and the Pt / HY catalyst is regenerated.

Embodiment 3

[0021] A micro-fixed-bed reactor packed with Au / SBA-15 catalyst: Au / SBA-15 particles were packed in a quartz reaction tube. Under normal temperature and pressure, the simulated indoor polluted air containing formaldehyde concentration of 70ppm and benzene concentration of 35ppm and water content of 1.564% flows through the fixed bed microreactor at a flow rate of 100ml / min. First, formaldehyde is completely oxidized to CO during storage at room temperature 2 and H 2 O, benzene is stored on the catalyst in the form of adsorption. CO at the outlet of the storage stage reactor 2 The concentration was kept at 80ppm, and the concentration of formaldehyde and benzene was not detected; after storage for 100min, the temperature was raised to 250℃ at a rate of 10℃ / min, and the benzene molecules stored on Au / SBA-15 were completely oxidized to CO 2 and H 2O, the benzene molecule was completely oxidized and the Au / SBA-15 catalyst was regenerated.

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Abstract

The invention discloses a catalyzation method for simultaneously removing aldehydes and benzene-series pollutants at room temperature, and belongs to the technical field of indoor air purification. The method comprises the following steps: putting a catalyst which is prepared by loading a noble metal to a molecular sieve carrier into an environment with aldehydes and benzene series; completely oxidizing aldehyde pollutants into CO2 and H2O in a room temperature stage; meanwhile, storing the benzene series on the catalyst; after the catalyst reaches or closes to saturation, heating the catalyst which stores the benzene series, wherein the heating temperature range is not less than 100 DEG C, and the optimal range of the regeneration temperature is 150 to 200 DEG C, the stored benzene series are completely converted into the CO2 and the H2O, and the catalyst is regenerated in situ. The time of the heating stage is extremely short relative to the room temperature stage; the energy consumption of the overall process is very low. By adopting the method, the actual using requirement on indoor air purification is met; the method has a broad application prospect in the field of indoor air pollutant purification.

Description

technical field [0001] The invention belongs to the technical field of indoor air purification and relates to a method for simultaneously removing indoor air pollutants aldehydes and benzene series. technical background [0002] In recent years, the pollution caused by volatile organic compounds (VOCs) in the atmosphere has become increasingly serious. After experiencing the "soot pollution" and "photochemical pollution" brought about by the industrial revolution, modern people are entering the "indoor environment" In the third pollution period marked by "air pollution", formaldehyde, acetaldehyde and other aldehydes and benzene, toluene, xylene and other benzene series have strong carcinogenic, teratogenic and mutagenic hazards, and because of their stable molecular structure, it is not easy to Being eliminated has been bothering people, becoming a typical representative of volatile organic pollutants. With the improvement of people's living standards, the extensive use of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/72
Inventor 石川王钰朱爱民陈冰冰
Owner DALIAN UNIV OF TECH
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