The effect of activation temperature on the textural properties and low-pressure adsorption performance of the porous coordination polymer Cu₂(pzdc)₂(bpy) [pzdc = pyrazine-2,3-dicarboxylate, bpy = 4,4′-bipyridine], better known as CPL-2, was considered to elucidate the material potential for separations. The effective activation temperature range was estimated via coupled thermal gravimetric and Fourier transforms infrared spectroscopy analysis. A textural property analysis via the α_s-plot, Dubinin−Radushkevich and Horvath−Kawazoe methods show that a significant reduction in effective surface area and micropore volume occurs when the activation temperature is increased from 373 to 423 K. Cooling of the sample in a moisture-free environment revealed that such reduction is nonreversible, as evidenced by single-component CO₂ equilibrium adsorption tests. Although CO₂ equilibrium adsorption isotherms exhibit a linear behavior in the ambient pressure range, an increase in activation temperature eventually decreases the pore size of the structure resulting in a considerable decrease in loading amounts. This was also corroborated by means of in situ high-temperature X-ray diffraction, which was used to monitor the lattice semiquantitative changes of CPL-2 during the thermal activation sequence. In addition, adsorption uptake data was gathered to estimate a diffusion time constant and elucidate preliminary information about the kinetics involved during the transport of CO₂ through the micropores of CPL-2. After inspection of the adsorbent particle morphology via scanning electron microscopy, it became ostensible that the transport phenomenological model suitable to fit the uptake data was that of a slab-shape particle. For the sample pretreated at 373 K the analysis yields an average diffusion time constant of ca. 0.5 s⁻¹ at 298 K.

中文翻译：

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Cu ₂（吡嗪-2,3-二羧酸盐）₂（4,4'-联吡啶）多孔配位吸附剂：活化温度，质构性质和低压范围内的CO ₂吸附

活化温度对多孔配位聚合物Cu ₂（pzdc）₂（bpy）[pzdc =吡嗪-2,3-二羧酸酯，bpy = 4,4'-联吡啶]的织构性质和低压吸附性能的影响，众所周知，它被称为CPL-2，以阐明分离的潜在材料。有效的活化温度范围通过热重分析和傅立叶变换红外光谱分析来估算。通过αA纹理属性分析_小号曲线图，Dubinin-Radushkevich和Horvath-Kawazoe方法显示，当活化温度从373 K升高到423 K时，有效表面积和微孔体积显着降低。在无湿气的环境中冷却样品表明这种降低单组分CO ₂平衡吸附试验证明，这种方法是不可逆的。虽然CO ₂平衡吸附等温线在环境压力范围内表现出线性行为，活化温度的升高最终会降低结构的孔径，从而导致加载量显着降低。这也通过原位高温X射线衍射得到了证实，该原位高温X射线衍射用于监测热激活序列期间CPL-2的晶格半定量变化。此外，收集了吸附吸收数据以估算扩散时间常数，并阐明了有关CO ₂传输过程中涉及的动力学的初步信息。通过CPL-2的微孔。通过扫描电子显微镜检查了吸附剂颗粒的形态后，可以看出适合于吸收数据的传输现象学模型是板状颗粒。对于在373 K预处理的样品，分析得出的平均扩散时间常数约为。在298 K时为0.5 s ^-1