作者:Rachel F. Warren、A. R. Ravishankara
DOI:10.1002/kin.550251005
日期:1993.10
AbstractThe rate coefficients for the removal of Cl atoms by reaction with three HCFCs, CF3CHCl2 (HCFC‐123), CF3CHFCl (HCFC‐124), and CH3CFCl2 (HCFC 141b), were measured as a function of temperature between 276 and 397 K. CH3CF2Cl (HCFC‐142b) was studied only at 298 K. The Arrhenius expressions obtained are: k1 = (3.94 ± 0.84)× 10−12 exp[−(1740 ± 100)/T] cm3 molecule−1 s−1 for CF3CHCl2 (HCFC 123); k2 = (1.16 ± 0.41) × 10−12 exp[−(1800 ± 150)/T] cm3 molecule−1 s−1 for CF3CHFCl (HCFC 124); and k3 = (1.6 ± 1.1) × 10−12 exp[−(1800 ± 500)/T] cm3 molecule−1 s−1 for CH3CFCl2 (HCFC 141b). In case of HCFC 141b, non‐Arrhenius behavior was observed at temperatures above ca. 350 K and is attributed to the thermal decomposition of CH2CFCl2 product into Cl + CH2CFCl. In case of HCFC‐142b, only an upper limit for the 298 K value of the rate coefficient was obtained. The atmospheric significance of these results are discussed. © 1993 John Wiley & Sons, Inc.