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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Heterogeneous reactions of SO2 with HOCl and HOBr on ice surfaces
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Heterogeneous reactions of SO2 with HOCl and HOBr on ice surfaces

机译：SO2与HOCl和HOBr在冰面上的多相反应

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The heterogeneous reactions of SO2 + HOX (X = Cl or Br) -> products on ice surfaces at low temperature have been investigated in a flow reactor coupled with a differentially pumped quadrupole mass spectrometer. Pseudo-first-order loss of SO2 over the ice surfaces has been measured under the conditions of concurrent HOX flow. The initial uptake coefficient of SO2 reaction with HOX has been determined as a function of HOX surface coverage, theta(HOX), on the ice. The initial uptake coefficients increase as the HOX coverage increases. The uptake coefficient can be expressed as gamma(t) = k(h)theta(HOX), where k(h) is an overall rate constant of SO2 + HOCl, which was determined to be (2.3 +/- 0.6) x 10(-19) and (1.7 +/- 0.5) x 10(-19) molecules(-1.)cm(2) at 190 and 210 K, and k(h) of SO2 + HOBr is (6.1 +/- 2.0) x 10(-18) molecules(-1), cm(2) at 190 K. theta(HOX) is in the range 8.1 x 10(13)-9.1 x 10(14) molecules, cm(-2). The kinetic results of the heterogeneous reaction of SO2 + HOX on ice surface are interpreted using the Eley-Rideal mechanism. The activation energy of the heterogeneous reaction of SO2 with HOCl on ice surface was determined to be about -37 +/- 10 kJ/mol in the 190-238 K range.
机译：在带有差动泵浦四极杆质谱仪的流动反应器中，研究了低温下冰表面上SO2 + HOX（X = Cl或Br）→产品的异质反应。在并发HOX流动的条件下，已经测量了冰面上SO2的假一阶损失。已经确定了冰上SO2与HOX反应的初始吸收系数是HOX表面覆盖率theta（HOX）的函数。初始摄取系数随着HOX覆盖率的增加而增加。吸收系数可以表示为gamma（t）= k（h）theta（HOX），其中k（h）是SO2 + HOCl的总速率常数，确定为（2.3 +/- 0.6）x 10 （190）和（1.7 +/- 0.5）x 10（-19）分子（-1。）cm（2）在190和210 K时，SO2 + HOBr的k（h）为（6.1 +/- 2.0 ）x 10（-18）分子（-1），在190 K时cm（2）。theta（HOX）在8.1 x 10（13）-9.1 x 10（14）分子，cm（-2）范围内。利用Eley-Rideal机理解释了SO2 + HOX在冰面上的非均相反应的动力学结果。在190-238 K范围内，SO2与HOCl在冰面上的异相反应的活化能确定为约-37 +/- 10 kJ / mol。

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