Article history: It was found that a series of spinel CoCr O oxides were very active and selective for dichloromethane 2 4 Received 2 January 2016 combustion, and the best performance was obtained on a catalyst calcined at 600 C (with a areal Received in revised form 1 February 2016 −8 −1 −2 ◦ speciﬁc reaction rate of 3.41 × 10 mol s m at 220 C). Quantitative analyses revealed that CH2Cl2 Accepted 5 February 2016 3+ 6+ 3+ Cr /Cr cations could partially substitute Co cations in the octahedral sites of the spinel oxide at Available online 6 February 2016 high-temperature calcination and thus to enhanced reducibility and surface acidity of the oxide, which synergistically governed the observed catalytic behaviors. Moreover, it was found that high valent Keywords: 6+ Cr species (Cr ) played very important role in the reaction, with a much higher turnover frequency Dichloromethane combustion −3 −1 3+ −3 −1 (2.2 × 10 s ) than that of the Cr (0.56 × 10 s ). CoCr O 2 4 © 2016 Elsevier B.V. All rights reserved. Microstructure Reducibility Surface acidity 1. Introduction during the reaction, and the possible formation of toxic chromium oxychloride at low
Applied Surface Science – Elsevier
Published: Apr 30, 2016
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