A two-stage low-concentration voc catalytic degradation method

Abstract

The invention discloses a two-stage low-concentration VOC catalytic degradation method, which comprises the following steps: step 1, enriching low-concentration VOC and performing preliminary catalytic degradation to obtain small molecule VOC substances; The degraded small molecule VOC substances are catalyzed and degraded again, so that the products can be discharged up to the standard. According to the method of the present invention, the low-concentration VOC is sequentially passed into the first-stage catalytic degradation reactor and the second-stage catalytic degradation reactor arranged in series, so that the low-concentration VOC is divided into two stages of degradation, and the first stage of degradation utilizes a catalyst with a large specific surface area. The characteristics of low-concentration VOC are enriched and initially catalytically degraded into small molecular substances; the second stage of degradation utilizes the efficient degradation of the catalyst to deeply mineralize small molecule VOC substances into carbon dioxide and water, and achieve the final discharge of exhaust gas up to the standard. The process route is simple, the conditions are easy to control, the requirements for equipment are low, and the versatility is strong, which can catalyze the degradation of various exhaust gas pollutants.

Description

technical field [0001] The invention belongs to the field of environmental purification, and in particular relates to a two-stage low-concentration VOC catalytic degradation method. Background technique [0002] Many volatile organic compounds—VOCs have potential carcinogenic effects on humans, and some VOCs are listed as key pollution by domestic and foreign environmental protection departments (Ministry of Ecology and Environment (MEE), US Environmental Protection Agency (EPA) and European Commission (EC)) and subject to strict supervision and control. Therefore, in recent years, the development of effective VOC treatment technology has attracted widespread attention at home and abroad. [0003] At present, the treatment technology of VOC pollutants mainly involves adsorption and catalytic degradation. Among them, the adsorption method can only absorb the pollutants from the gas phase, and only completes the transfer of the pollutants, but cannot really eliminate the pol...

AI Technical Summary

Problems solved by technology

However, the composite catalyst prepared according to the traditional method may not be able to perfectly combine the advantages of each catalyst, and even the catalytic effect of the composite catalyst may be lower than that of a single component catalyst; moreover, the design process of the composite catalyst needs to control the composite ratio, reaction temperature, Synthetic conditions such as preparation atmosphere, the operation is very complicated, the efficiency is low, and the result is often half the result with half the effort

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