Mechanism of the noncatalytic oxidation of soot using in situ transmission electron microscopy

Ming Gao, Yongjun Jang, Lu Ding (), Yunfei Gao, Sheng Dai (), Zhenghua Dai, Guangsuo Yu, Wenming Yang () and Fuchen Wang ()
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Ming Gao: East China University of Science and Technology
Yongjun Jang: East China University of Science and Technology
Lu Ding: East China University of Science and Technology
Yunfei Gao: East China University of Science and Technology
Sheng Dai: East China University of Science and Technology
Zhenghua Dai: East China University of Science and Technology
Guangsuo Yu: East China University of Science and Technology
Wenming Yang: National University of Singapore
Fuchen Wang: East China University of Science and Technology

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Soot generation is a major challenge in industries. The elimination of soot is particularly crucial to reduce pollutant emissions and boost carbon conversion. The mechanisms for soot oxidation are complex, with quantified models obtained under in situ conditions still missing. We prepare soot samples via noncatalytic partial oxidation of methane. Various oxidation models are established based on the results of in situ transmission electron microscopy experiments. A quantified maturity parameter is proposed and used to categorize the soot particles according to the nanostructure at various maturity levels, which in turn lead to different oxidation mechanisms. To tackle the challenges in the kinetic analysis of soot aggregates, a simplification model is proposed and soot oxidation rates are quantified. In addition, a special core-shell separation model is revealed through in situ analysis and kinetic studies. In this study, we obtain important quantified models for soot oxidation under in situ conditions.

Date: 2023
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DOI: 10.1038/s41467-023-41726-4

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