首页> 外文期刊>RSC Advances >Arrhenius parameters for the OH-initiated degradation of methyl crotonate, methyl-3,3-dimethyl acrylate, (E)-ethyl tiglate and methyl-3-butenoate over the temperature range of 288-314 K
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Arrhenius parameters for the OH-initiated degradation of methyl crotonate, methyl-3,3-dimethyl acrylate, (E)-ethyl tiglate and methyl-3-butenoate over the temperature range of 288-314 K

机译:Arhenius参数用于甲基rotonate的OH-引发的甲酸甲酯,甲基-3,3-二甲基丙烯酸甲酯,(e) - 乙酯和甲基-3-丁酸甲酯在288-314k的温度范围内

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摘要

The relative-rate technique has been employed to obtain rate coefficients for the reactions between the OH radical and four unsaturated esters (methyl crotonate (k(1)), methyl-3,3-dimethyl acrylate (k(2)), (E)-ethyl tiglate (k(3)) and methyl-3-butenoate (k(4))) between 288 and 314 K in 760 Torr of synthetic air. The experiments were performed in a multiple-pass environmental chamber with in situ FTIR detection of the esters and reference compounds. The rate coefficients for the reactions displayed a negative dependence with temperature and low pre-exponential factors. The following Arrhenius expressions (in units of cm(3) per molecule per s) were obtained: k(1) = (3.39 +/- 0.78) x 10(-12) exp[(750 +/- 159)/T], k(2) = (2.95 +/- 0.63) x 10(-12) exp[(838 +/- 182)/T], k(3) = (1.49 +/- 0.56) x 10(-12) exp[(522 +/- 114)/T] and k(4) = (1.90 +/- 1.25)x 10(-12) exp[(834 +/- 185)/T]. The kinetic results are in agreement with a mechanism involving mainly OH radical addition to the double with the reversible formation of an OH-adduct. Atmospheric implications are discussed with particular reference to the rate coefficients obtained as a function of the temperature.
机译:已经采用相对速率技术来获得OH基团和四种不饱和酯(甲基rotonate(k(1)),甲基-3,3-二甲基丙烯酸甲酯(K(2))之间的反应的速率系数(e ) - 在760托的合成空气中,在288和314k之间替乙酯(K(3))和甲基-3-丁酸酯(K(4)))。该实验在多通环境室中进行,其原位FTIR检测酯和参考化合物。反应的速率系数与温度和低预指数因子显示出负依赖性。获得以下Arrhenius表达(每分子为每分分子为单位):K(1)=(3.39 +/- 0.78)×10(-12)exp [(750 +/- 159)/ t] ,K(2)=(2.95 +/- 0.63)x 10(-12)exp [(838 +/- 182)/ t],k(3)=(1.49 +/- 0.56)x 10(-12) Exp [(522 +/- 114)/ t]和k(4)=(1.90 +/- 1.25)x 10(-12)exp [(834 +/- 185)/ t]。动力学结果与涉及OH激进的机制一致,其中双加合物的可逆形成。特别参考作为温度的函数所获得的速率系数讨论大气意义。

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  • 来源
    《RSC Advances》 |2016年第59期|共7页
  • 作者单位

    Univ Nacl Cordoba Fac Ciencias Quim CONICET Inst Invest Fisicoquim Cordoba INFIQC Ciudad Univ RA-5000 Cordoba Argentina;

    Univ Nacl Cordoba Fac Ciencias Quim CONICET Inst Invest Fisicoquim Cordoba INFIQC Ciudad Univ RA-5000 Cordoba Argentina;

    Univ Nacl Cordoba Fac Ciencias Quim CONICET Inst Invest Fisicoquim Cordoba INFIQC Ciudad Univ RA-5000 Cordoba Argentina;

    Berg Univ Wuppertal Fak Math &

    Nat Wissensch Phys &

    Theoret Chem D-42119 Wuppertal Germany;

    Berg Univ Wuppertal Fak Math &

    Nat Wissensch Phys &

    Theoret Chem D-42119 Wuppertal Germany;

    Univ Nacl Cordoba Fac Ciencias Quim CONICET Inst Invest Fisicoquim Cordoba INFIQC Ciudad Univ RA-5000 Cordoba Argentina;

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  • 正文语种 eng
  • 中图分类 化学;
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