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´˜
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well as the coexistence of NiO and Ni3V2O8 on V–Ni/TiO2 catalyst
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Based on the above discussions, a plausible reaction mecha-
nism can be proposed for catalytic combustion of DCM over
V–Ni/TiO2 catalyst, as shown in Fig. 11.
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7. Conclusions
V2O5 and/or NiO modied TiO2 (anatase) catalysts were
prepared by impregnation method and investigated in catalytic
combustion of DCM. Both acidic and redox properties play
important roles in deep oxidation of DCM. V–Ni/TiO2 exhibits
the best activity and stability for the model compound selected.
The coexistence of NiO and Ni3V2O8, good reducibility and
oxidative dehydrogenation ability, as well as high intensity of
medium and strong Lewis acidic sites and high coke resistance
ability of the catalyst, are responsible for the destruction of
DCM and its intermediates at a low-temperature range; there-
fore, the V–Ni/TiO2 catalyst shows good stability during long
term exposure to DCM.
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Acknowledgements
The authors thank the nancial support of Open-end Founda-
tion of environmental science and engineering top priority
discipline of Zhejiang Province (No. G2853105014).
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79198 | RSC Adv., 2015, 5, 79192–79199
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