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研究论文

Rate constants for reactions of hydroxyl radicals with a series of alcohols by relative rate method

摘要：在299±2K温度下,以甲醇为参照物,采用相对速率方法得到了几种醇与OH自由基在气相中的反应速率常数,这些速率常数分别为(单位为:10⁵m³·mol^-1·s^-1):乙醇k₁=17.6,正丙醇k₂==35.2,2丙醇k₃==31.2,正丁醇k₄==48.2,2甲基-1丙醇k₅==62.0,2甲基-2丙醇k₆==5.36,正戊醇k₇==51.4,3甲基-1-丁醇k₈==68.6.其中2-甲基-1丙醇的速率常数在本文中是首次报道.根据各自的反应速率常数计算得到它们在大气中的平均寿命分别为:τ1=95.1h,τ2=47.5h,τ3=53.6h,τ4=34.7h,τ5=27.0h,τ6=312h,τ7=32.6h,τ8=24.4h.

Abstract：Rate constants for reactions of hydroxyl radicals with a series of alcohols were measured at 299±2K by a competitive technique. The alcohols include ethanol(k₁), 1-propanol(k₂), 2 propanol(k₃), 1-butanol(k₄), 2 methyl 1-propanol(k₅), 2 methyl 2-propanol(k₆), 1-pentanol(k₇), and 3 methyl 1 pentanol(k₈). The rate constants are k₁==17 6,k₂==35 2,k₃==31 2,k₄==48 2,k₅==62 0,k₆==5 36,k₇==514, and k₈==68 6 respectively (in units of 10 5m³·mol^-1·s^-1). Taking these results, the tropospheric lifetime can be assessed as τ 1=95.1h,τ 2=47.5h,τ 3=53.6h,τ 4=34.7h,τ 5=27.0h,τ 6=312h,τ 7=32.6h, and τ 8=24.4h respectively.