Preparation of asymmetric tubular Co‐SiC catalytic membrane for synergistic removal of PM2.5, NO, and toluene

Abstract

AbstractSiC catalytic membranes exhibit remarkable promise in controlling of dust and atmospheric pollutant emissions. However, their fabrication is limited to small‐scale production, with dimensions up to a disc of 30 mm in diameter. Scaling up the fabrication to tubular SiC catalytic membranes without compromising their application performance remains a challenge due to uncontrollable structural defects during processing. Herein, a tubular Co‐SiC (TCS) catalytic membrane was fabricated through a combination of cold‐isostatic‐pressure molding, spin spray‐coating and acid‐treating processes. The TCS catalytic membrane shows high filtration efficiencies toward industrial‐PM2.5 concentrations. A competitive reaction between NO and toluene was observed on TCS catalytic membrane, and the toluene oxidation is prioritized at low temperatures. In a 52 h stability test, the TCS catalytic membrane achieved PM2.5, NO, and toluene removal efficiencies of 98.92%, 70%, and 100%, respectively. This study lays the foundation for the practical implementation of SiC catalytic membranes in industrial emissions treatment.