Catalyst capable of removing N2O, NO and NO2 simultaneously and preparation method

Abstract

The invention relates to the field of industrial catalysis and environmental governance, in particular to a catalyst capable of removing N2O, NO and NO2 simultaneously and a preparation method of the catalyst. After tail gas containing N2O, NO and NO2 is subjected to the action of the catalyst, on one hand, N2O gas is decomposed directly, on the other hand, NO gas and NO2 gas are subjected to an SCR (selective catalytic reduction) denitration reaction, and simultaneous removal of N2O, NO and NO2 is realized. The plate catalyst capable of removing N2O, NO and NO2 simultaneously is prepared from V2O5 and a Co-based composite metal oxide as active components, TiO2 as a supporter and one or two of WO3 and MoO3 as a metal additive through mixing, rolling coating, pleating, drying and roasting. The N2O decomposing efficiency of the catalyst in the temperature range of 300-450 DEG C can reach 80% or higher, the NO removal rate and the NO2 removal rate can reach 85% or higher, and the catalyst has excellent oxygen inhibition resistance and water vapor poisoning resistance.

Description

technical field [0001] The invention relates to the field of industrial catalysis and environmental treatment, in particular to a combined removal of N 2 O, NO and NO 2 Catalysts and their preparation methods. Background technique [0002] As an important air pollutant, nitrogen oxides not only affect human health, but also pose a serious threat to the living environment. Common nitrogen oxides mainly include N 2 O, NO and NO 2 Wait. N 2 O has no serious harm to the human body, and its chemical properties are stable. However, studies have confirmed that N 2 O has a strong greenhouse effect, and its ability to cause the greenhouse effect is 310 times stronger than carbon dioxide, while N 2 O can also seriously damage the ozone layer, and its damage to the ozone layer is even greater than that of chlorofluorocarbons. While this gas destroys the ozone, it does not change itself, and its retention time in the atmosphere can reach as long as 120 years. Therefore, its accu...

AI Technical Summary

Problems solved by technology

Exhaust gas from nitric acid industry, adipic acid industry, etc. contains a large amount of N 2 O, NO and NO 2 , in the traditional removal technology, it needs to be removed separately in stages, which not only affects the safe operation of the system, but also greatly increases the operating cost

Chinese patent application number CN201310424160.4 discloses a shaped direct catalytic N 2 A catalyst for decomposing O and a manufacturing method thereof. The catalyst uses oxides of zinc and nickel as the main active components and a composite material as a carrier. Although it has good activity at high temperatures, the catalyst does not have the SCR denitrification catalyst to remove NO, NO 2 characteristics