首页|Catalytic oxidation of dichloromethane over CrFeO mixed oxides: Improved activity and stability by sulfuric acid treatment
Catalytic oxidation of dichloromethane over CrFeO mixed oxides: Improved activity and stability by sulfuric acid treatment
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NSTL
Elsevier
A CrFeO mixed oxide with an FeCr2O4 spinel structure was treated with sulfuric acid and tested for catalytic combustion of dichloromethane (DCM). The acid-treated catalysts (denoted as CrFeO-4S and CrFeO-9S) were more active than the pristine one, with the CrFeO-9S giving a 2-fold higher rate at 240 degrees C (35.7 versus 17.8 mu mol m(- 2) h(-1)). More importantly, the acid treatment greatly enhanced the catalyst stability in long term reaction. Various characterizations revealed that the acid treatment improved the redox property and surface acidity of the CrFeO oxide, which accounted for the enhance activity. Meanwhile, the acid treatment removed weakly coordinated Cr species on the catalyst surface and thus avoided the Cr leakage during the reaction, which was responsible for the excellent stability. Moreover, kinetics and spectroscopic results revealed that the surface sulfate evolved a new reaction path to the formation of formaldehyde intermediate, which could be further oxidized to COx.
NSTL
Elsevier
