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7019178 
Journal Article 
Labile oxygen promotion of the catalytic oxidation of acetone over a robust ternary Mn-based mullite GdMn2O5 
Dong, A; Gao, S; Wan, X; Wang, L; Zhang, T; Wang, Li; Lang, X; Wang, W; , 
2020 
Yes 
Applied Catalysis B: Environmental
ISSN: 0926-3373 
ELSEVIER 
AMSTERDAM 
271 
WOS:000532681500021 
Mn-based mullite catalyst GdMn2O5 is developed via the hydrothermal method to efficiently remove volatile organic compound acetone with a high efficiency and stability in total oxidation. The T-90 over GdMn2O5 approaches to 160 s degrees C in contrast to 191 degrees C over 1 wt % Pt/Al2O3. The catalytic performance maintains after reaction at 200 degrees C for 260 h with 5.0 % H2O. The surface labile oxygen is the key to superior catalytic performance. According to the in situ DRIFTS and the oxidation pathway proposed by DFT calculations, the acetate species decomposition is assigned as the rate-limiting step. And the calculated kinetic barrier for the rate-limiting step, 151.7 kJ/mol (1.58 eV), is in line with the apparent activation energy from acetone oxidation over GdMn2O5 of 150.0 kJ/mol (1.56 eV). This work provides insights into developing highly efficient and hydrothermally stable volatile organic compounds removal catalysts via surface oxygen activation. 
Acetone oxidation; Mullite oxide; Labile oxygen; Density functional theory