Kinetics and mechanisms for the reactions of CF_3OCH_3 and CF_3OC(O)H with OH radicals using an environmental reaction chamber

L.Chen; K.Nohara; K.Takeuchi; T.Ibusuki

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Kinetics and mechanisms for the reactions of CF_3OCH_3 and CF_3OC(O)H with OH radicals using an environmental reaction chamber

机译：使用环境反应室进行CF_3OCH_3和CF_3OC（O）H与OH自由基反应的动力学和机理

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The atmospheric chemistry of CF_3OCH_3, a possible HCFCs/HFCs substitute was studied using a smong chamber/FTIR technique. The ether was reacted with OH radicals prepared by photolysis of ozone in 100 Torr of an H_2O/O_2/He gas mixture in a 1 m~3 temperature-controlled chamber. Using a relative rate method, k(OH + CF_3OCH_3) = (4.22 +- 0.84) X 10~(-12) exp[(-1750+-350)/T] cm~3 molecule~(-1) s~(-1) over the temperature range 268-308 K. The rate constnat at 298 K was (1.19 +- 0.14) X 10~(-14) cm~3 molcule~(-1) s~(-1). The products ofthe OH radical initiated degradation of CF_3OCH_3 were investigated in 100-230 Torr of an O_2/He gas mixture at 298 K using in situ FTIR spectroscopy. k(OH + CF_3OC(O)H) = (1.68 +- 0.20) X 10~(-14) cm~3 molecule~(-1) s~(-1) at 98 K was determined. The major products of the oxidation of CF_3OC(O)H were COF_2 and CO_2. these results are discussed with respect to the atmospheric chemistry of CF_3OCH_3 and CF_3OC(O)H.

机译：使用smong chamber / FTIR技术研究了CF_3OCH_3（一种可能的HCFC / HFCs替代品）的大气化学性质。使醚与通过在1 m〜3的温控室中在100托的H_2O / O_2 / He气体混合物中臭氧光解制得的OH自由基反应。使用相对速率法，k（OH + CF_3OCH_3）=（4.22 +-0.84）X 10〜（-12）exp [（-1750 + -350）/ T] cm〜3分子〜（-1）s〜（ -1）在268-308 K的温度范围内。在298 K下的速率常数为（1.19 +-0.14）X 10〜（-14）cm〜3分子〜（-1）s〜（-1）。使用原位FTIR光谱在298 K的O_2 / He气体混合物中100-230 Torr中研究了OH自由基引发的CF_3OCH_3降解产物。在98 K下测定k（OH + CF_3OC（O）H）=（1.68 +-0.20）X 10〜（-14）cm〜3分子〜（-1）s〜（-1）。 CF_3OC（O）H氧化的主要产物为COF_2和CO_2。将针对CF_3OCH_3和CF_3OC（O）H的大气化学性质讨论这些结果。

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2001年第48期|共6页
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L.Chen; K.Nohara; K.Takeuchi; T.Ibusuki;
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中图分类物理化学（理论化学）、化学物理学;
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1. Kinetics and mechanisms for the reactions of CF_3OCH_3 and CF_3OC(O)H with OH radicals using an environmental reaction chamber [J] . L.Chen, K.Nohara, K.Takeuchi, The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory . 2001,第48期

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Kinetics and mechanisms for the reactions of CF_3OCH_3 and CF_3OC(O)H with OH radicals using an environmental reaction chamber

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