Preparation of asymmetric tubular Co-SiC catalytic membrane for synergistic removal of PM_2.5, NO, and toluene

SiC 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-PM_2.5 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 PM_2.5, 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.