Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 607, Issue -, Pages 100-110Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.08.170
Keywords
VOC removal; Catalytic oxidation; Toluene; Manganese oxide catalyst; Oxygen vacancy; In situ DRIFTS
Categories
Funding
- ZiQoo Chemical Co. Ltd., Japan
- China Scholarship Council (CSC), P. R. China
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The study demonstrates that MnOx catalyst treated with microwave radiation shows higher activity for toluene oxidation, attributed to the higher concentration of oxygen vacancies derived from rich phase interface defects caused by the microwave radiation. Additionally, the Mn-MW-60 catalyst exhibits excellent thermal stability and water vapor tolerance.
Oxygen vacancy on the heterogeneous catalyst is of great importance to the catalysis of volatile organic compound (VOC) oxidation. Herein, microwave radiation with special energy-excitation is successfully utilized for the post-processing of a series of manganese oxides (MnOx) to generate oxygen vacancies. It is found that the MnOx catalyst with 60 min of microwave radiation demonstrates higher activity for toluene oxidation with a T-50% of 210 degrees C and a T-100% of 223 degrees C, which is attributed to the higher concentration of oxygen vacancies derived from the rich phase interface defects resulted from the microwave radiation. Furthermore, the Mn-MW-60 catalyst possesses excellent thermal stability and water vapor tolerance even under 20 vol% H2O atmospheres within 60 h. In situ DRIFTS analysis verifies that both surface and lattice oxygen species simultaneously participate the oxidation process, and all reactions over different environments follows two different pathways. Meanwhile, it is proposed that those oxygen vacancies derived from microwave radiation could facilitate the rate-controlling step of opening the aromatic ring based on the electron back-donation, thereby leading to the increment of catalytic activity. (C) 2021 Elsevier Inc. All rights reserved.
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