Robust Joule-heating ceramic reactors for catalytic CO oxidation

• Published in: Journal of advanced ceramics Vol. 11; no. 7; pp. 1163 - 1171
• Main Authors: Liu, Fangsheng, Zhao, Zhibo, Ma, Yuyao, Gao, Yi, Li, Jiajie, Hu, Xun, Ye, Zhengmao, Ling, Yihan, Dong, Dehua
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01.07.2022; Springer; Springer Nature B.V
• Subjects: Carbon monoxide; Catalytic activity; Ceramic coatings; Ceramic materials; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Energy efficiency; Glass; High temperature; Low temperature; Manganese dioxide; Materials Science; Nanotechnology; Natural Materials; Ohmic dissipation; Oxidation; Oxidation-reduction reaction; Povidone; Reactors; Research Article; Resistance heating; Robustness; Selectivity; Sintering; Structural Materials; China; ceramic reactor; CO oxidation; temperature control; microchannel reactor; Joule heating
• ISSN: 2226-4108; 2227-8508
• DOI: 10.1007/s40145-022-0603-5

Joule-heating reactors have the higher energy efficiency and product selectivity compared with the reactors based on radiative heating. Current Joule-heating reactors are constructed with electrically-conductive metals or carbon materials, and therefore suffer from stability issue due to the presence of corrosive or oxidizing gases during high-temperature reactions. In this study, chemically-stable and electrically-conductive (La 0.80 Sr 0.20 ) 0.95 FeO 3 (LSF)/Gd 0.1 Ce 0.9 O 2 (GDC) ceramics have been used to construct Joule-heating reactors for the first time. Taking the advantage of the resistance decrease of the ceramic reactors with temperature increase, the ceramic reactors heated under current control mode achieved the automatic adjustment of heating to stabilize reactor temperatures. In addition, the electrical resistance of LSF/GDC reactors can be tuned by the content of the high-conductive LSF in composite ceramics and ceramic density via sintering temperature, which offers flexibility to control reactor temperatures. The ceramic reactors with dendritic channels (less than 100 urn in diameter) showed the catalytic activity for CO oxidation, which was further improved by coating efficient MnO 2 nanocatalyst on reactor channel wall. The Joule-heating ceramic reactors achieved complete CO oxidation at a low temperature of 165 °C. Therefore, robust ceramic reactors have successfully demonstrated effective Joule heating for CO oxidation, which are potentially applied in other high-temperature catalytic reactions.