1. High catalytic performances of CeO2–CrOx catalysts for chlorinated VOCs elimination.
- Author
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Yang, Peng, Shi, Zhinan, Yang, Shanshan, and Zhou, Renxian
- Subjects
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CERIUM oxides , *VOLATILE organic compounds , *CHROMIUM oxide , *POROUS materials , *SURFACE chemistry - Abstract
A series of porous CeO 2 –CrO x mixed oxides are synthesized using different precipitants (NaOH, NH 4 OH, (NH 4 ) 2 CO 3 and urea) and evaluated for deep oxidation of various chlorinated VOCs (CH 2 Cl 2 , C 2 HCl 3 , C 2 H 4 Cl 2 and C 6 H 5 Cl). The results show that all these materials represent porous structures and small particle sizes (2–8 nm). Part of Cr element can go into the lattice of CeO 2 , resulting in the formation of Ce–Cr–O mixed oxide. Compared with pure CeO 2 and Cr 2 O 3 , the amount of Cr 6+ species and oxygen vacancies in CeO 2 –CrO x mixed oxides are significantly increased, due to the strong interaction between CeO 2 and CrO x . Thus, all the CeO 2 –CrO x mixed oxides exhibit high catalytic activity and good durability for deep oxidation of chlorinated VOCs, especially the CeO 2 –CrO x prepared using (NH 4 ) 2 CO 3 as precipitant. Moreover, only slight chlorinated byproducts are detected in the process of chlorinated VOCs oxidation, and the surface accumulation of coke and Cl species as well as the loss of Cr element is slight during the long-term reaction at 265 °C, indicating that these CeO 2 –CrO x materials possess interesting fundamental result, deserving more research before conclusion on practical value. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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