Preparation method and application of lamellar manganese oxide catalyst used for eliminating VOCs (volatile organic compounds) gases at low temperature

Abstract

The invention discloses a preparation method and application of lamellar manganese oxide catalyst used for eliminating VOCs (volatile organic compounds) gases at low temperature. The low-cost potassium permanganate and alcohol are adopted as raw materials for the catalyst, and alkaline solution and dispersing agent are used for adjustment, thus a lamellar manganese oxide structure type molecular sieve (OL, open loop) with high specific surface area (97m<2> / g) and high thermal stability (more than 500 DEG C) is prepared. The catalyst prepared by the invention has higher eliminating efficiency on high-airspeed (60000-100000 / h) and low-concentration (500-1000ppm) VOCs gases. When the temperature is 190 DEG C, methylbenzene can be completely converted into non-poisonous materials CO2 and H2O, and elimination factor of methylbenzene can be maintained to be more than 90% within 100 hours; and when the temperature is 90 DEG C, formaldehyde can be completely converted into non-poisonous materials CO2 and H2O, and the elimination factor of formaldehyde can be maintained to be more than 90% within 100 hours. The catalyst prepared by the invention has the advantages of available raw materials, simple preparation process, strong practicability, low temperature high efficiency and no secondary pollution, VOCs gases can be completely eliminated.

Description

technical field [0001] The invention relates to the preparation of layered manganese oxide (OL) used for catalytic combustion to eliminate VOCs gas, and its use for low-temperature and high-efficiency catalytic combustion to eliminate VOCs gas. Background technique [0002] Volatile organic compounds (VOCs) are the main pollutants in the urban atmosphere, mainly from vehicle exhaust emissions, industrial production and energy use. VOCs gases are mostly poisonous and can induce disease, carcinogenicity, and even teratogenicity. VOCs gas pollution has been listed as one of the five major factors that endanger human health internationally. The formation of ozone-based photochemical smog is mainly a chemical reaction process dominated by VOCs gases. Therefore, the control and governance of atmospheric VOCs is a key issue in environmental protection. Catalytic combustion is an ideal method for dealing with VOCs gas. It uses a catalyst to decompose VOCs gas into carbon dioxide ...

AI Technical Summary

Problems solved by technology

At present, there are few studies on the elimination of formaldehyde by catalytic combustion at home and abroad. According to all the reported documents at present, although they also have good activity, most of them use noble metal Pd and Pt supported catalysts, and use oxides, such as: manganese oxide, There are very few reports on the catalytic combustion of formaldehyde by catalysts. In this study, a layered manganese oxide catalyst was used to obtain good catalytic elimination activity and stability.

Images