Abstract: At present, although activity detection of the plate-type De-NO_x catalyst is carried out primarily with reference to methods specified in the domestic and international standards, there have been some issues in existence in practice, such as limited scope of applications and poor detection precision. In this article, the features and existing problems in traditional detection modes are analyzed, then the improvements and optimization procedures are provided to not only enhance the accuracy of activity detection but also make comparison among plate-type De-NO_x catalysts from various production batches and manufacturers. The efforts to improve detection methods are demonstrated through a series of practice tests. The study outcome indicated that, improved detection methods solved the De-NO_x activities comparability problem between plate-type De-NO_x catalysts of different types. Also the defect of structural instability in detecting unit with traditional methods is effectively improved, which resulted in significant promotion in the aspects of the detection precision, accuracy and repeatability.

Key words: SCR De-NO_x, plate catalyst, activity, denitrification efficiency, detection method