Preparation of coated honeycomb catalyst and carbon monoxide catalytic removal of flue gas

CO emission from iron and steel sintering flue gas has been paid more and more attention. However, there is a lack of efficient and practical CO removal technology for large flow flue gas. A series of coated catalysts were prepared by coating powder catalyst on cordierite honeycomb ceramic supports. The physicochemical properties of the coated catalysts were analyzed based on a series of characterization techniques, and the catalytic performance of CO was evaluated under actual sintering flue gas conditions. The results show that 1wt‰ polyvinyl alcohol content of slurry and 300℃ calcination could promote the uniformity of powder catalyst distribution on the surface of the support, and improve the ratio of Mn⁴⁺/Mn³⁺and O_ads/O_latt. The coating shedding rate of the optimized coated catalyst is 1.25% after 60 min ultrasonic vibration. The catalytic efficiency of 99%CO can be achieved at 7500 h⁻¹ space speed, 1%CO, 8% water vapour content and 110℃, and remains stable within 72 h. Based on the actual desulfurization of sintering flue gas in a steel plant, the efficiency can be stable above 82% after 720 h. The study can provide reference for the application of CO removal technology for industrial flue gas.