Readily processed multifunctional SiC catalytic filter for industrial emissions control

One step fabrication of SiC catalytic filter is currently limited by the mismatched calcination temperature between SiC filter (>1700°C) and the catalysts (<800°C), and the difficulty in the chemical immobilization of catalysts. Here, a SrTi_1−xCo_xO₃-SiC (STC-SiC) catalytic filter was directly fabricated from raw SiC grains and STC precursor oxides (SrCO₃, TiO₂, and Co₃O₄) via a single-step reactive thermal processing (SRTP) approach, which significantly reduced energy consumption and sintering time over 50%. Acid etching enables the active TiO₂ and Co₃O₄ nanoparticles spontaneously formed on STC catalysts in STC-SiC catalytic filter (STC-SiC-A), which induces the generation of oxygen vacancies and facilitates the adsorption and activation of O₂ and NO. The STC-SiC-A catalytic filter exhibits highly competitive NO oxidation of 60% and complete dust interception (100%) at 360°C. This work demonstrates an efficient and rapid processing technique of SiC based catalytic filters, which can also be implemented on other ceramic-based catalytic filters.