The purpose of this VGB-Standard is to manifest a testing procedure, which can be employed by catalyst manufacturers, SCR equipment suppliers, power plant operators
and independent testing institutions for determining the characteristics of SCR catalysts. The most important characteristics are guaranteed in the purchase contracts, deviation from these, which are penalized, need to be manifested under the agreed upon boundary conditions (i.e. testing conditions).

NOx emissions from stationary combustion sources can be reduced by a variety of primary measures in the furnace or by secondary measures downstream.

The so called Selective Catalytic Reduction (SCR process) has become the world’s most widely applied technology for secondary NOx reduction from combustion processes. This is particularly true when high NOx removal efficiencies (80 to 90%) are required.

Smaller plants (i.e. waste-to-energy, biomass, etc.) also use the so called Selective Non Catalytic Reduction (SNCR-process) reducing NOx in the gas phase without employing a catalyst.