Readily processed multifunctional SiC catalytic filter for industrial emissions control

Abstract

AbstractOne 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 SrTi1−xCoxO3‐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.