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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Heterogeneous uptake of gaseous nitric acid on dolomite (CaMg(CO3)(2)) and calcite (CaCO3) particles: A knudsen cell study using multiple, single, and fractional particle layers
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Heterogeneous uptake of gaseous nitric acid on dolomite (CaMg(CO3)(2)) and calcite (CaCO3) particles: A knudsen cell study using multiple, single, and fractional particle layers

机译：白云岩（CaMg（CO3）（2））和方解石（CaCO3）颗粒上气态硝酸的异质吸收：使用多个，单个和部分颗粒层的克努森细胞研究

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摘要

In this study, the heterogeneous uptake of gaseous nitric acid on dolomite, CaMg(CO3)(2), and calcite, CaCO3, particles under dry conditions at 296 K was investigated. A Knudsen cell reactor was used to measure heterogeneous uptake coefficients for these reactions. Several different experiments were performed including those on many, single, and fractional layers of particles. For experiments using multiple particle layers, the Knudsen cell data were modeled to take into account gas diffusion into the underlying layers of the sample. From this analysis. initial heterogeneous uptake coefficients, gamma(o.t), were determined to be (5 +/- 2) x 10(-4) and (2 +/- 1) x 10(-3) for dolomite and calcite, respectively, at a nitric acid concentration of 6.5 x 10(10) molecules cm(-3). For experiments that employed single or fractional particle layers, the initial heterogeneous uptake coefficient was analyzed using a recent method described in the literature. Values of the initial heterogeneous uptake coefficient using this analysis were in agreement with the above analysis and determined to be (7 +/- 4) x 10(-4) and (2 +/- 0.4) x 10(-3) for CaMg(CO3)(2) and CaCO3, respectively. In addition, these results are compared to previous literature values.
机译：在这项研究中，研究了干燥条件下在296 K下白云石CaMg（CO3）（2）和方解石CaCO3颗粒上气态硝酸的不均匀吸收。使用努氏细胞反应器测量这些反应的异质摄取系数。进行了几个不同的实验，包括在许多，单个和部分颗粒层上进行的实验。对于使用多个粒子层的实验，对Knudsen细胞数据进行了建模，以考虑到气体扩散到样品下面的层中。从这个分析。对于白云石和方解石，初始异质吸收系数γ（ot）分别确定为（5 +/- 2）x 10（-4）和（2 +/- 1）x 10（-3）。硝酸浓度为6.5 x 10（10）分子cm（-3）。对于采用单层或部分颗粒层的实验，使用文献中描述的最新方法分析了初始异质吸收系数。使用该分析的初始异质吸收系数的值与上述分析一致，并确定为CaMg为（7 +/- 4）x 10（-4）和（2 +/- 0.4）x 10（-3） （CO3）（2）和CaCO3。此外，将这些结果与以前的文献值进行了比较。

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