Sean McGivern W, Nguyen Huong Giang T, Manion Jeffrey A
Chemical Sciences Division, National Institute of Standards and Technology, Gaithersburg, MD.
Ind Eng Chem Res. 2023;62(21). doi: 10.1021/acs.iecr.2c04050.
Dynamic column breakthrough (DCB) measurements are valuable for characterizing the adsorption of gaseous species by solid sorbents and are typically used for high concentrations of adsorptives, often at elevated temperatures and pressures. However, adsorbents for the direct capture of carbon dioxide from natural air demand measurement capability at low partial pressures of CO at atmospherically relevant temperatures and pressures. We have developed a new apparatus focused on the measurement of DCB curves under typical tropospheric conditions. The new apparatus is described in detail and validated with breakthrough curve measurements. Adsorption capacities are reported at (233.1 to 323.1) K and (351 to 1078) hPa for low carbon dioxide concentrations on 13X zeolite samples on the order of a few hundred milligrams. Measurement uncertainties related to timing, flow, temperature, and concentrations are analyzed and the present results at 273 K, 298 K, and 323 K are compared with static measurements obtained with a manometric adsorption analyzer. In addition, experiments at a typical atmospheric CO concentration of 400 μL · L have been performed.
动态柱穿透（DCB）测量对于表征固体吸附剂对气态物质的吸附作用很有价值，通常用于高浓度吸附质，且常常是在高温高压条件下。然而，用于从自然空气中直接捕获二氧化碳的吸附剂需要在与大气相关的温度和压力下，在低二氧化碳分压下具备测量能力。我们开发了一种新装置，专注于在典型对流层条件下测量DCB曲线。详细描述了该新装置并用穿透曲线测量进行了验证。报告了在（233.1至323.1）K和（351至1078）hPa下，几百毫克量级的13X沸石样品对低浓度二氧化碳的吸附容量。分析了与计时、流量、温度和浓度相关的测量不确定度，并将273 K、298 K和323 K时的当前结果与用压力吸附分析仪获得的静态测量结果进行了比较。此外，还进行了典型大气CO浓度为400 μL·L时的实验。
