A membrane catalyst synthesized from manganese slag with a high H2O and SO2 tolerance during SCR

Abstract

Shaped catalysts are actually much more practical than powdered catalysts, and are of great technological importance. However, only few investigations showed the feasibility of fabricating efficient shaped catalysts. For the first time, this work synthesized a membrane catalyst from manganese slag and Teflon filter. The obtained catalyst converted 92.6% of nitrogen oxide (1000 ppm, 1.44 m min−1) at 200 °C in selective catalytic reduction. The activation energy was as low as 13.80 kJ mol−1. Moreover, the membrane catalyst showed a good ability to tolerate 10% H2O + 200 ppm SO2. After detailed characterizations, interstitial Teflon in the membrane catalyst created a wrinkle layer on catalyst surface, increased the hydrophobicity from both mesoscopic and microscopic scales, thus resulting in good tolerance ability for H2O and SO2. Above result puts forward an applicable shaped catalyst to alleviate inevitable physical deactivation derived from sulphate deposition.