Device and method for degrading VOCs (Volatile Organic Chemicals) by ultraviolet irradiation in cooperation with monatomic catalyst

Abstract

The invention relates to a device and a method for degrading VOCs (Volatile Organic Chemicals) by ultraviolet irradiation in cooperation with a monatomic catalyst. The device comprises a gas distribution system, an ultraviolet photolysis-monatomic catalysis system and a detection system which are connected in sequence. The temperature of the catalytic oxidation reactor is controlled to be 20-40 DEG C, the pressure of the catalytic oxidation reactor is controlled to be 0.1-0.15 MPa, and the humidity of the catalytic oxidation reactor is controlled to be 10-50%; completely reacted gas dischargedfrom the lower part of the reactor is divided into three paths, one path is directly introduced into a gas chromatograph to detect the VOCs conversion rate on line, the other path is introduced intoa methane conversion furnace to detect the mineralization rate of VOCs, and the last part is emptied after being treated to reach the standard. According to the preparation method, the noble metal loading capacity (1wt%) is effectively reduced, the atom utilization rate is improved, meanwhile, the activation of O2 at the interface site of the monatomic catalyst is promoted by ultraviolet irradiation, high-activity oxygen species are generated, VOCs are efficiently catalytically oxidized and degraded into CO2 and H2O, and the reaction activity is further improved.

Description

technical field [0001] The invention relates to the field of industrial waste gas purification, in particular to a device and method for degrading VOCs by ultraviolet light and a single-atom catalyst. Background technique [0002] As a major category of air pollutants, VOCs not only cause serious harm to the human body, but also have serious carcinogenic, teratogenic and mutagenic effects; they also cause great damage to the environment. VOCs will undergo atmospheric photochemical reactions and lead to photochemical smog At the same time, VOCs are also precursors of smog. The great harm of VOCs to the human body and the environment has attracted the attention of relevant national departments, and relevant laws and regulations have been formulated to limit the emission of VOCs. By 2020, VOCs emission reductions in key areas and key industries will be achieved by more than 10%. [0003] At present, the most common method of VOCs treatment is catalytic combustion. The method...

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Problems solved by technology

However, at present, ozone is often used as an oxidant for catalytic degradation of VOCs at room temperature. The incomplete reaction of ozone in the reaction process is likely to cause secondary pollution. Therefore, it is necessary to use oxygen as an oxidant to catalytically degrade VOCs.

[0004] With the introduction of the concept of energy saving and environmental protection, the disadvantages of unsustainable development exposed by the traditional catalytic combustion method and catalytic ozonation method have become increasingly unacceptable

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