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Indoor air pollutant formaldehyde ''storage-oxidation'' cycle purification method

A technology for indoor air and circulation purification, applied in the field of indoor air purification, can solve the problems of difficult regeneration, cumbersome operation of composite technology, fast failure of adsorption technology, etc., achieve the effect of short time, broad application prospects, and solve the problem of in-situ regeneration

Inactive Publication Date: 2011-11-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a "storage-oxidation" two-stage cycle purification method for indoor air pollutant formaldehyde, which overcomes 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

[0016] One filled with Ag / CeO 2 Micro fixed bed reactor: 0.2ml 40-60 mesh Ag / CeO 2 The particles were packed in a quartz reaction tube with an inner diameter of 4 mm. Under normal temperature and pressure, simulated indoor polluted air with a formaldehyde concentration of 80ppm and a water content of 1.564% flows through the "storage-oxidation" micro-fixed-bed reactor at a flow rate of 100ml / min. First, formaldehyde is partially oxidized to formate and stored on the catalyst during storage at room temperature; after storage for 90 min, the quartz reaction tube is placed in a tube furnace, heated to 120 °C at a rate of 10 °C / min, and stored in Ag / CeO 2 Species such as formate on the surface are completely oxidized to CO 2 and H 2 O, formate and other species are completely oxidized while Ag / CeO 2 The catalyst is regenerated and can continue with the next "storage-oxidation" cycle.

Embodiment 2

[0018] One filled with Ag-MnO x -CeO 2 Micro fixed bed reactor: 0.2ml 40-60 mesh Ag-MnO x -CeO 2 The particles were packed in a quartz reaction tube with an inner diameter of 4 mm. Under normal temperature and pressure, simulated indoor polluted air with a formaldehyde concentration of 80ppm and a water content of 1.564% flows through the "storage-oxidation" micro-fixed-bed reactor at a flow rate of 100ml / min. First, formaldehyde is partially oxidized to formate and stored on the catalyst during storage at room temperature; after storage for 300 min, the quartz reaction tube is placed in a tube furnace, heated to 80 °C at a rate of 10 °C / min, and stored in Ag-MnO x -CeO 2 Species such as formate on the catalyst are completely oxidized to CO 2 and H 2 O, formate and other species are completely oxidized while Ag-MnO x -CeO 2 The catalyst is also regenerated and can continue with the next "storage-oxidation" cycle.

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Abstract

An indoor air pollutant formaldehyde ''storage-oxidation'' cycle purification method, which belongs to the technical field of indoor air purification, is characterized by comprising the following steps of: firstly converting a part of formaldehyde into formate by catalytic oxidation and storing the formate on a catalyst at room temperature; after the storage capacity of the catalyst is saturated, initiating a regeneration function, namely properly heating the catalyst until the stored formate and the like are completely oxidized to perform in situ regeneration of the catalyst, which can be continuously used for a next cycle; and completing the whole formaldehyde ''storage-oxidation'' cycle on a non-noble metal oxide-type catalyst which has the functions of ''storage'' and ''oxidation''. The effect and the benefit of the invention are as follows: the method provided by the invention can be utilized to solve the competitive adsorption problem of other coexisting components in air (such as H2O) and formaldehyde at room temperature as well as the in situ regeneration issue of the catalyst; the time of the heating regeneration process is short relative to the time of storage at room temperature, and the energy consumption during the whole process is low; the method satisfies the actual application requirements and must have a wide 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 "storage-oxidation" cycle purification method for indoor air pollutant formaldehyde. technical background [0002] With the improvement of people's living standards, the extensive use of interior building decoration and decoration materials has caused indoor environment pollution. Formaldehyde is one of the most typical and serious pollutants in the indoor environment, and has been identified as carcinogenic and teratogenic substances by the World Health Organization. my country's national standard stipulates that the maximum allowable concentration of formaldehyde in indoor air is 0.08mg / m 3 , about 0.06ppm at room temperature. However, according to surveys, the content of formaldehyde in the air in half of the homes and offices in most cities in my country has exceeded this standard by more than ten times or even dozens of times, causing great harm to people's...

Claims

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Application Information

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