Superhydrophobic catalyst-wrapped fibrofelt with anti-moisture, anti-dusting and NH3-SCR properties

Abstract

In order to overcome the problem of catalyst poisoning and achieve high-efficient denitration and dust-removal integration, new catalytic filters loaded with superhydrophobic MnO_x catalysts (SA-MnO_x@Filter) were fabricated by a waterborne coating method for the first time, realizing high-efficiency denitration and dust removal simultaneously (NO_x conversion exceeded 91% at 180 °C). Benefiting from its superhydrophobicity, the catalyst was prevented from being covered by resin, exposing more effective catalytic areas. Furthermore, the superhydrophobic components on the catalyst surface also inhibited the sulfation of active components and enhanced SO₂ tolerance. Meanwhile, the low surface tension allowed for the easy removal of ammonium bisulfate and dust, realizing reversible inactivation. Besides, the superhydrophobic components restrained the condensation of water into a liquid film on the catalyst surface, improving H₂O resistance. The newly designed superhydrophobic filter has potent catalytic activity and excellent SO₂ and H₂O resistance, making it a potential filter for real exhaust control.