Gas-phase and Pd-catalyzed hydrodehalogenation of CBrClF2, CCl2F2, CHClF2, and CH2F2

Hai Yu; Eric M. Kennedy; Md Azhar Uddin; Yusaku Sakata; Bogdan Z. Dlugogorski

doi:10.1021/ie049228b

Gas-phase and Pd-catalyzed hydrodehalogenation of CBrClF₂, CCl₂F₂, CHClF₂, and CH₂F₂

Hai Yu, Eric M. Kennedy, Md Azhar Uddin, Yusaku Sakata, Bogdan Z. Dlugogorski

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Hydrodehalogenation of CBrClF₂, CCl₂F₂, CHClF₂) and CH₂F₂ with hydrogen has been studied in the gas phase and over supported Pd catalysts in a tubular alumina reactor. During gas-phase reactions, selectivity to CH₂F₂ is low for the hydrodehalogenation of CBrClF₂, CCl₂F ₂, and CHClF₂. CHClF₂ is the primary product for the hydrodehalogenation of CBrClF₂ and CCl₂F ₂, whereas C₂F₄ is the major product for the hydrodehalogenation of CHClF₂. Over Pd/C catalysts, CH ₂F₂ is the primary product, with selectivities generally over 60% for the hydrodehalogenation of CBrClF₂, CCl ₂F₂, and CHClF₂. Halocarbons and hydrogen compete for the available surface sites on Pd, and it is suggested that the rate-limiting step during the catalytic hydrodehalogenation of the four halocarbons involves the cleavage of C-halogen bonds, that is, C-Br in CBrClF₂, C-Cl in CCl₂F₂ and CHClF₂, and C-F in CH₂F₂.

Original language	English
Pages (from-to)	3442-3452
Number of pages	11
Journal	Industrial and Engineering Chemistry Research
Volume	44
Issue number	10
DOIs	https://doi.org/10.1021/ie049228b
Publication status	Published - May 11 2005
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Industrial and Manufacturing Engineering

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title = "Gas-phase and Pd-catalyzed hydrodehalogenation of CBrClF2, CCl2F2, CHClF2, and CH2F2",

abstract = "Hydrodehalogenation of CBrClF2, CCl2F2, CHClF2) and CH2F2 with hydrogen has been studied in the gas phase and over supported Pd catalysts in a tubular alumina reactor. During gas-phase reactions, selectivity to CH2F2 is low for the hydrodehalogenation of CBrClF2, CCl2F 2, and CHClF2. CHClF2 is the primary product for the hydrodehalogenation of CBrClF2 and CCl2F 2, whereas C2F4 is the major product for the hydrodehalogenation of CHClF2. Over Pd/C catalysts, CH 2F2 is the primary product, with selectivities generally over 60% for the hydrodehalogenation of CBrClF2, CCl 2F2, and CHClF2. Halocarbons and hydrogen compete for the available surface sites on Pd, and it is suggested that the rate-limiting step during the catalytic hydrodehalogenation of the four halocarbons involves the cleavage of C-halogen bonds, that is, C-Br in CBrClF2, C-Cl in CCl2F2 and CHClF2, and C-F in CH2F2.",

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AU - Yu, Hai

AU - Kennedy, Eric M.

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AU - Sakata, Yusaku

AU - Dlugogorski, Bogdan Z.

PY - 2005/5/11

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N2 - Hydrodehalogenation of CBrClF2, CCl2F2, CHClF2) and CH2F2 with hydrogen has been studied in the gas phase and over supported Pd catalysts in a tubular alumina reactor. During gas-phase reactions, selectivity to CH2F2 is low for the hydrodehalogenation of CBrClF2, CCl2F 2, and CHClF2. CHClF2 is the primary product for the hydrodehalogenation of CBrClF2 and CCl2F 2, whereas C2F4 is the major product for the hydrodehalogenation of CHClF2. Over Pd/C catalysts, CH 2F2 is the primary product, with selectivities generally over 60% for the hydrodehalogenation of CBrClF2, CCl 2F2, and CHClF2. Halocarbons and hydrogen compete for the available surface sites on Pd, and it is suggested that the rate-limiting step during the catalytic hydrodehalogenation of the four halocarbons involves the cleavage of C-halogen bonds, that is, C-Br in CBrClF2, C-Cl in CCl2F2 and CHClF2, and C-F in CH2F2.

AB - Hydrodehalogenation of CBrClF2, CCl2F2, CHClF2) and CH2F2 with hydrogen has been studied in the gas phase and over supported Pd catalysts in a tubular alumina reactor. During gas-phase reactions, selectivity to CH2F2 is low for the hydrodehalogenation of CBrClF2, CCl2F 2, and CHClF2. CHClF2 is the primary product for the hydrodehalogenation of CBrClF2 and CCl2F 2, whereas C2F4 is the major product for the hydrodehalogenation of CHClF2. Over Pd/C catalysts, CH 2F2 is the primary product, with selectivities generally over 60% for the hydrodehalogenation of CBrClF2, CCl 2F2, and CHClF2. Halocarbons and hydrogen compete for the available surface sites on Pd, and it is suggested that the rate-limiting step during the catalytic hydrodehalogenation of the four halocarbons involves the cleavage of C-halogen bonds, that is, C-Br in CBrClF2, C-Cl in CCl2F2 and CHClF2, and C-F in CH2F2.

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Gas-phase and Pd-catalyzed hydrodehalogenation of CBrClF₂, CCl₂F₂, CHClF₂, and CH₂F₂

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