Reaction Mechanism for CCl2F2 Catalytic Decomposition over MoO3/ZrO2

Tian Cheng Liu; Yu Jiao Guo; Ping Ning; Ming Long Yuan

doi:10.4028/www.scientific.net/AMM.295-298.326

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 295-298Reaction Mechanism for CCl2F2 Catalytic...

Reaction Mechanism for CCl₂F₂ Catalytic Decomposition over MoO₃/ZrO₂

Abstract:

Catalytic hydrolysis decomposition of dichlorodifluoromethane (CCl₂F₂) in the presence of water vapor and oxygen was studied over a series of solid acids using a fixed-bed reactor. Solid acid MoO₃/ZrO₂ displayed the highest activity, over which the conversion of CCl₂F₂ reached 100 % at 250 °C. CO₂ was the main-product and the selectivity to CClF₃ remained lower than 28.0 %. CO was not detected as by-product. The decomposition activity depended on the calcination temperature and the ZrO₂ content. The activity of solid acid MoO₃/ZrO₂ correlates well with its specific surface area and the amount of medium-strong acid sites on the surface. To explain the reaction mechanism for CCl₂F₂ catalytic decomposition over MoO₃/ZrO₂, a surface intermediate, O_surface-CF2-O_surface is proposed.

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Periodical:

Applied Mechanics and Materials (Volumes 295-298)

Pages:

326-330

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.295-298.326

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Online since:

February 2013

Authors:

Tian Cheng Liu, Yu Jiao Guo, Ping Ning, Ming Long Yuan

Keywords:

Catalytic Hydrolysis, Dichlorodifluoromethane (CCl₂F₂), MoO₃/ZrO₂, Reaction Mechanism, Solid Acid

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