Rate constants for the reactions of OH with CH{sub 3}CFCl{sub 2} (HCFC-141b), CH{sub 3}CF{sub 2}Cl (HCFC-142b), and CH{sub 2}FCF{sub 3} (HFC-134a)

Journal Article · Thu Feb 20 04:00:00 EST 1992 · Journal of Physical Chemistry

DOI:https://doi.org/10.1021/j100183a008· OSTI ID:554983

Zhang, Zhengyu; Huie, R E; Kurylo, M J ^[1]

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1. National Institute of Standards & Technology, Gaithersburg, MD (United States)

The rate constants for the reaction of OH with CH{sub 3}CFCl{sub 2} (HCFC-141b) over the temperature range 250-297 K were remeasured with improved detection sensitivity as a function of flash energy and concentration of OH radical precursor (H{sub 2}O). The rate constants were reduced at the lower OH concentrations employed, suggesting complications due to secondary reactions. The new values disagree with the low-temperature values reported earlier but agree with the values extrapolated from the higher temperature results (T> 298 K). In contrast, rate constants for CH{sub 3}CF{sub 2}Cl(HCFC-142b) and CH{sub 2}FCF{sub 3} (HFC-134a), remeasured at the lower flash energy at 270 K, were found to agree with those reported earlier at higher flash energy. 7 refs., 1 fig., 1 tab.

• Sponsoring Organization: USDOE
• OSTI ID: 554983
• Journal Information: Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 4 Vol. 96; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC CHEMISTRY
CHEMICAL REACTION KINETICS
HYDROXYL RADICALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
REFRIGERANTS
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K