首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Kinetic Studies of the Reactions CH_3 + NO_2 -> Products,CH_3O + NO_2 -> Products,and OH + CH_3C(O)CH_3 -> CH_3C(O)OH + CH_3,over a Range of Temperature and Pressure
【24h】

Kinetic Studies of the Reactions CH_3 + NO_2 -> Products,CH_3O + NO_2 -> Products,and OH + CH_3C(O)CH_3 -> CH_3C(O)OH + CH_3,over a Range of Temperature and Pressure

机译:在一定温度和压力范围内CH_3 + NO_2->产物,CH_3O + NO_2->产物和OH + CH_3C(O)CH_3-> CH_3C(O)OH + CH_3反应的动力学研究

获取原文
获取原文并翻译 | 示例
           

摘要

The title reactions were investigated using pulsed laser photolysis combined with pulsed laser induced fluorescence detection of CH_3O to determine the rate cosfficients for CH_3 + NO_2 -> products (3) and CH_3O + NO_2 -> products (5) as a function of temperature and pressure,and to estimate the yield of CH_3 (and thus the yield of CH_3C(O)OH) from the reaction of OH with CH_3C(O)CH_3 (2) at two different temperatures.Reaction 3 has both bimolecular and termolecular components: a simplified falloff parametrization with F_(cent) = 0.6 gives k~0_(3b) = (3.2 +- 1.3) X 10~(-28)(T/297)~(-0.3) cm~6 s~(-1) and k~(infinity)_(3b) = (4.3 +- 0.4) X 10~(-11)(T/297)~(1.2) cm~3 s~(-1) with CH_3NO_2 the likely product.The rate constant for the bimolecular reaction pathway to form CH_3O + NO (3a) was found to be 1.9 X 10~(-11) cm~(-3) s~(-1).The low- and high-pressure limiting rate coefficients for reaction between CH_3O and NO_2 to form CH_3ONO_2 (5b) were derived as k~0_(5b) = (5.3 +- 0.3) X 10~(-29)(T/297)~(-4.4) cm~6 s~(-1) and k~(infinity)_(5b) = (1.9 +- 0.05) X 10~(-11)(T/297)~(-1.9) cm~3 s~(-1), respectively.Although the final result is associated with some experimental uncertainty,we find that CH_3 is formed in the reaction between OH and CH_3C(O)CH_3 at approx=50% yield at room temperature and 30% at 233K.
机译:使用脉冲激光光解结合脉冲激光诱导的CH_3O荧光检测研究标题反应,以确定CH_3 + NO_2->产物(3)和CH_3O + NO_2->产物(5)随温度和压力变化的速率系数,并估算在两个不同温度下OH与CH_3C(O)CH_3(2)的反应中CH_3的产率(以及CH_3C(O)OH的产率)。反应3同时具有双分子和分子成分: F_(cent)= 0.6的衰减参量得到k〜0_(3b)=(3.2 +-1.3)X 10〜(-28)(T / 297)〜(-0.3)cm〜6 s〜(-1)和k〜(无穷大)_(3b)=(4.3 +-0.4)X 10〜(-11)(T / 297)〜(1.2)cm〜3 s〜(-1),可能的产物为CH_3NO_2。速率常数形成CH_3O + NO(3a)的双分子为1.9 X 10〜(-11)cm〜(-3)s〜(-1)。反应的低压和高压极限速率系数CH_3O和NO_2之间形成CH_3ONO_2(5b)的关系为k〜0_(5b)=(5.3 +-0.3)X 10〜(-29 )(T / 297)〜(-4.4)cm〜6 s〜(-1),k〜(无穷大)_(5b)=(1.9 +-0.05)X 10〜(-11)(T / 297)〜 (-1.9)cm〜3 s〜(-1)。尽管最终结果与实验不确定性有关,但我们发现CH_3是在OH与CH_3C(O)CH_3之间的反应中生成的,产率约为50%在室温下,在233K下为30%。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号