Studies on the CrF3/AlF3 Catalyst for Synthesis of HFC-134a as a Substitute for CFC-12(V)——Interaction of CrF3 and AlF3

Abstract

Abstract: The effects of Cr ³⁺ content in CrF₃/AlF₃ catalysts on activity for synthesis of HF 134a from reaction of HCFC₁₃₃a with HFwere investigated. FTIR, EPRand XPShave been employed to characterize the CrF₃/AlF₃ catalysts. The results show that CrF₃ existed in a monolayer dispersion where the interaction between CrF₃ and AlF₃ support became stronger when Cr ³⁺ content less than₁%. The CrF₃/AlF₃ catalyst with 0.1% Cr ³⁺ exhibits the highest turnover frequency. The residual oxygen in the catalyst forms surface active species of CrAlO_m F_n from the interaction of CrF₃ and AlF₃, which is the cause of high selectivity to HFC-134a in F/Cl exchange reaction.

Key words: Interaction of CrF₃ and AlF₃, Turnover frequency, 1,1,2 Tetrafluoroethane, Active species(Ed.: Y, X)

CLC Number:

O641

TrendMD:

LU Jian, SHI Lei, LI Hui-Li, PENG Shao-Yi . Studies on the CrF₃/AlF₃ Catalyst for Synthesis of HFC-134a as a Substitute for CFC-12(V)——Interaction of CrF₃ and AlF₃[J]. Chem. J. Chinese Universities, 1998, 19(10): 1677.

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Studies on the CrF₃/AlF₃ Catalyst for Synthesis of HFC-134a as a Substitute for CFC-12(V)——Interaction of CrF₃ and AlF₃

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