Preparation process of honeycomb SCR (selective catalytic reduction) denitration catalyst

Abstract

The invention discloses a preparation process of a honeycomb SCR(selective catalytic reduction) denitration catalyst. The preparation process includes steps of (1), subjecting a mixture of raw materials which are mixed proportionally to primary decaying, filtering and pre-extruding the mixture, subjecting the mixture to secondary decaying and finally forming and extruding out a catalyst blank in vacuum; (2), subjecting the catalyst blank formed and extruded in vacuum to primary drying at a temperature ranging from 22-68 DEG C and a humidity ranging from 95-10% gradually; (3), subjecting the catalyst dried primarily to secondary drying at the temperature ranging from 60 DEG C to 105 DEG C within the drying period of 12-24 hours; (4), calcining the catalyst blank dried secondarily at the temperature ranging from 68 DEG C to 600 DEG C for 20-30 hours, and detecting finished products after calcining. The honeycomb SCR denitration catalyst is high in yield and high in strength, manufacturing cost of the catalyst is reduced, and mechanical performance of the catalyst is improved.

Description

technical field [0001] The invention relates to the technical field of denitration catalyst preparation, in particular to a preparation process of a honeycomb SCR denitration catalyst. Background technique [0002] Flue gas denitrification is currently a method commonly used by developed countries in the world to reduce NOx emissions, which can achieve high NOx removal efficiency. Among them, SCR and SNCR technologies are widely used, especially SCR technology, and the denitrification efficiency can reach 90%. above. SCR has hundreds of successful applications and decades of operating experience around the world. About 95% of flue gas denitrification devices in Japan and Germany use SCR technology. This method is mature in technology, high in denitrification rate, and has almost no secondary pollution. . [0003] The key to SCR denitrification technology is the catalyst, whose cost usually accounts for 30% to 40% of the initial investment. At present, most of the catalyst...

AI Technical Summary

Problems solved by technology

There is no humidity control during the drying process, and the extruded catalyst is directly dried at 80°C and is prone to cracking; in addition, the catalyst is heated rapidly during the drying and calcination process due to the large temperature span, which is also an important cause of cracking