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 degrees C) and the catalysts (<800 degrees 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 O-2 and NO. The STC-SiC-A catalytic filter exhibits highly competitive NO oxidation of 60% and complete dust interception (100%) at 360 degrees 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.

Automated summary

This study introduces a fast and efficient processing technique for SiC-based catalytic filters, using a one-step reactive thermal processing approach to fabricate SrTi1-xCoxO3-SiC (STC-SiC) catalytic filters. Acid etching enhances the formation of active nanoparticles on the STC catalysts, leading to improved adsorption and activation of oxygen and nitrogen oxides.