Study on The Effect of ‘Ash Core’ on the Performance of Catalysts in the Preparation of SCR Honeycomb Denitration Catalyst

Abstract

The SCR honeycomb denitration catalyst will have a “grey core” during the preparation process. In this paper, the same batch of fresh catalyst is used to prepare the “grey core” and the normal “yellow core” catalysts for comparison. Through the catalyst denitration performance evaluation test, when the denitration efficiency is 88.3%, the calculated activities of the two catalysts of “yellow core” and “grey core” are 24.9Nm/h and 25.3Nm/h, respectively; when the denitration efficiency is 85.5%, the calculated activity of the catalysts are both 24.5Nm/h. Through analysis of the physical and chemical properties of the catalyst, it is found that the alkali metal content and the alkaline earth metal content of the two catalysts are basically the same. The specific surface areas of the “yellow core” and “grey core” catalysts are 58.65m2/g and 58.24m2/g, respectively. By infrared spectroscopy, the “grey core” catalyst was produced due to the deposition of carbon, and then through the wear performance test, it is found that the “grey core” catalyst has better wear performance, but the “grey core” catalyst is more brittle, when there is external force. At the time, cracks are easily generated in both the axial direction and the radial direction, which is detrimental to the integrity of the catalyst, and also poses a safety hazard to the use of the regenerated catalyst.