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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Diffusion of H_2SO_4 in Humidified Nitrogen: Hydrated H_2SO_4
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Diffusion of H_2SO_4 in Humidified Nitrogen: Hydrated H_2SO_4

机译：H_2SO_4在湿润氮中的扩散：水合H_2SO_4

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摘要

First-order rate coefficients for the wall loss of H_2SO_4 were measured as a function of relative humidity in a high-pressure laminar flow tube in conjunction with chemical ionization mass spectrometry detection. The measurements yield a diffusion coefficient for H_2SO_4 vapor in N_2 at 298 K of 0.094 (+-0.006) atm cm~2 s~(-1) For relative humidities (RH) up to about 40%, the measured first-order loss rates steadily decreased as the RH was increased. The effective diffusion coefficient at 40% RH was ～20% less than without H_2O present. The measured loss rates were less dependent on water vapor for RH between 40 and 70%. We interpret these observations as due to the addition of up to two H_2O molecules to H_2SO_4, thus slowing the diffusion rate to the wall. The results indicate that about half the H_2SO_4 molecules are hydrated at ～8% RH and it is likely a second water molecule interacts with this species at higher RH. Calculations of the decrease in diffusivity of H_2SO_4 due to addition of water are consistent with the observed decreases.
机译：结合化学电离质谱检测法，在高压层流管中测量了H_2SO_4壁损失的一级速率系数与相对湿度的关系。测量结果得出298 K下N_2中H_2SO_4蒸气的扩散系数为0.094（+ -0.006）atm cm〜2 s〜（-1）。对于相对湿度（RH）高达约40％，测得的一阶损耗率随着RH的增加稳步下降。在40％RH下的有效扩散系数比不存在H_2O时的有效扩散系数低约-20％。相对于相对湿度在40％至70％之间的水，所测得的损失率对水蒸气的依赖性较小。我们将这些观察结果解释为是由于在H_2SO_4中最多添加了两个H_2O分子，从而减慢了向壁的扩散速度。结果表明，约一半的H_2SO_4分子在〜8％RH时被水合，在更高的RH时第二个水分子很可能与该物质相互作用。添加水导致H_2SO_4扩散率降低的计算与观察到的降低一致。

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