Most of the denitrification catalysts used in SCR are based on TiO2 as the carrier and V2O5 or V2O5-WO3 or V2O5-MoO3 as the active ingredient, commonly in the form of honeycomb, plate or corrugated.

Different structures, active ingredients and raw materials can lead to different catalytic properties of catalysts, so how to determine the ratio of raw materials for denitrification catalysts to improve the catalytic properties? First, let's understand the important indicators of catalysts.

1、Process performance indicators
Denitrification efficiency
Before the catalyst is used, denitrification efficiency is often designed according to the actual needs of the denitrification reaction and production characteristics, and suitable denitrification catalysts are searched for to ensure that the catalytic efficiency and denitrification efficiency can reach the expected target.

SO2/SO3 Conversion Rate
The conversion ratio of SO2 to SO3 in flue gas has an important influence on the overall catalytic reaction, and the higher the conversion ratio, the better the catalytic effect and the reduced amount of catalyst required. At the same time, the analysis of SO2 and SO3 conversion rate can be used to understand the catalyst usage and the specific efficiency of the catalyst.

NH3 escape rate
The volume fraction of NH3 in the outlet flue gas reflects the amount of NH3 that does not participate in the reaction. The analysis of the NH3 escape rate allows to understand the process of the catalytic reaction and the efficiency of the catalytic reaction. If the NH3 elimination rate is too high, it will increase the production cost. Therefore, the correct analysis of NH3 escape rate has a direct impact on the analysis of the catalytic reaction effect and meeting the reaction needs.

Pressure drop
In a catalytic reaction, the pressure drop of the denitrification system is composed of the catalyst pressure drop, the reactor and the flue pressure drop. The smaller the pressure drop, the more adequate the catalytic reaction. The analysis of pressure drop can grasp the catalyst reaction rate, effect and specific situation, which is important to improve the quality of catalytic reaction and meet the needs of catalytic reaction.

2. Chemical content
The chemical composition content of catalysts mainly refers to the chemical composition of the active component and the carrier catalyst. To grasp the chemical composition content of catalysts and analyze the ratio of various chemical components in catalysts is important to improve the reaction rate and play the catalytic role of catalysts.
Carrier composition: TiO2 (>80%)
Main active component: V2O5 (about 1%)
WO3: improve the activity in the high temperature region, while suppressing the oxidation rate, enhancing the thermal stability and preventing the reduction of specific surface area due to sintering.
Other components: SO42-, inorganic substances other than titanium
Structural components: glass fiber, etc. (to enhance mechanical strength), polyethylene oxide, etc. (binder)

In addition to process performance indicators and chemical composition content, performance indicators of denitrification catalysts also include geometric characteristics parameters and mechanical strength parameters, which will be introduced to you in detail in the next issue.

Anhui Yuanchen Environmental Protection Technology Co., Ltd ("Yuanchen Technology") started with dust filter bags and has 16 years of experience in the field of flue gas pollutant treatment. The R&D and production of dust filter needle felt (PPS, PTFE, P84 and composite series filter materials as raw materials) are at the leading level in the industry and are widely used in the field of flue gas dust removal in electric power, cement, steel and waste incineration.

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