The definition

measurement method and engineering application of the SCR catalyst activity K were presented.The SCR catalyst activity K is a comprehensive characteristic value reflecting the mass transfer and chemical reaction rate of the catalytic reaction system.It is not only related to the catalyst component

but also has something to do with the catalyst geometry and the flow condition and other factors.As an important indicator evaluating the catalyst performance

the K has been widely used in catalyst product quality certification and residual activity assessment.There are mainly two kinds of equipment for catalyst activity measurement

pilot-plant scale and small scale device.In catalyst quality certification and evaluation

the absolute value of K is needed

so the K must be measured by pilot-plant scale device.The potential P of SCR reactor is a comprehensive indicator evaluating the performance of SCR device.Regularly measuring the P's value and tracing its changing trend has great help for the economic operation of SCR device.