Atmospheric Chemistry of (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3
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- 作者：Freja From 脴sterstr酶m ; Timothy J. Wallington ; Mads P. Sulbaek Andersen ; Ole John Nielsen
- 刊名：Journal of Physical Chemistry A
- 出版年：2015
- 出版时间：October 22, 2015
- 年：2015
- 卷：119
- 期：42
- 页码：10540-10552
- 全文大小：665K
- ISSN：1520-5215
文摘
Smog chambers with in situ FTIR detection were used to measure rate coefficients in 700 Torr of air and 296 卤 2 K of: k(Cl+(CF3)2CHOCH3) = (5.41 卤 1.63) 脳 10鈥?2, k(Cl+(CF3)2CHOCHO) = (9.44 卤 1.81) 脳 10鈥?5, k(Cl+CF3C(O)OCH3) = (6.28 卤 0.98) 脳 10鈥?4, k(OH+(CF3)2CHOCH3) = (1.86 卤 0.41) 脳 10鈥?3, and k(OH+(CF3)2CHOCHO) = (2.08 卤 0.63) 脳 10鈥?4 cm3 molecule鈥? s鈥?. The Cl atom initiated oxidation of (CF3)2CHOCH3 gives (CF3)2CHOCHO in a yield indistinguishable from 100%. The OH radical initiated oxidation of (CF3)2CHOCH3 gives the following products (molar yields): (CF3)2CHOCHO (76 卤 8)%, CF3C(O)OCH3 (16 卤 2)%, CF3C(O)CF3 (4 卤 1)%, and C(O)F2 (45 卤 5)%. The primary oxidation product (CF3)2CHOCHO reacts with Cl atoms to give secondary products (molar yields): CF3C(O)CF3 (67 卤 7)%, CF3C(O)OCHO (28 卤 3)%, and C(O)F2 (118 卤 12)%. CF3C(O)OCH3 reacts with Cl atoms to give: CF3C(O)OCHO (80 卤 8)% and C(O)F2 (6 卤 1)%. Atmospheric lifetimes of (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3 were estimated to be 62 days, 1.5 years, and 220 days, respectively. The 100-year global warming potentials (GWPs) for (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3 are estimated to be 6, 121, and 46, respectively. A comprehensive description of the atmospheric fate of (CF3)2CHOCH3 is presented.