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

Author

Chen, Jiahao, Yin, Yongliang, Tan, Jiesong, Zeng, Yiqing, Low, Ze‐Xian, Zhong, Zhaoxiang, and Xing, Weihong

Subjects
EMISSIONS (Air pollution), TOLUENE, DUST, PARTICULATE matter, DUST control, LOW temperatures
Abstract

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‐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. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Readily processed multifunctional SiC catalytic filter for industrial emissions control.

Author

Chen, Jiahao, Yin, Yongliang, Low, Ze‐Xian, Yuan, Kai, Wei, Wei, Zeng, Yiqing, Zhong, Zhaoxiang, and Xing, Weihong

Subjects
EMISSIONS (Air pollution), EMISSION control, ENERGY consumption, CALCINATION (Heat treatment), TITANIUM dioxide, CATALYSTS
Abstract

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 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. [ABSTRACT FROM AUTHOR]

Published
2023
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