Abstract: To standardize the quality supervision and management of deNO_x catalysts, sampling and spot checks for the newly-purchased SCR de-NO_x catalysts for thermal power units are made mandatory by all the power groups of China. The statistical results from a professional testing institute in 2016 show that a large number of newly-purchased catalysts have certain defects or drawbacks, of which 57.1% are of dimension deviation and 54.3% have appearance defects, 48.6% and 54.3% are of compressive strength and abrasion ratio below the standards respectively. There are also 8.6% of the catalysts whose activities and specific surface area are less than the standard limits, and 62.9% and 5.7% of which have less main component (WO₃) contents but higher contents of micro elements than what is specified in the technical protocols. From the results it is evident that the current situation of the quality of domestic SCR deNO_x catalyst supply is still severe, which urgently calls for more regulation and management.

Key words: thermal power plant, deNOx, catalyst, inspection, supervision