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Hybrid MIL-101( Cr)@ MIL-53( Al) composite for carbon dioxide capture from biogas

机译：Hybrid MIL-101（CR）@ MIL-53（AL）用于二氧化碳从沼气捕获的复合材料

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In this study, hybrids of nanoporous MIL-101(Cr) and MIL-53(Al) were synthesized using a hydrothermal method for various time periods, ranging from 8 to 40 h. The prepared materials were characterized by powder X-ray diffraction (PXRD) and elemental analysis, and their specific surface areas were measured by N-2 sorption at 77 K using the Brunauer-Emmett-Teller (BET) method. To investigate the practical application of these materials, the pure carbon dioxide and methane adsorption capacities of the samples were determined using the volumetric method. The Langmuir model was used to fit the CO2 and CH4 isotherms. Extended Langmuir (EL) equations and the ideal adsorbed solution theory (IAST) models were used to obtain the CO2/CH4 selectivity. The sample with the highest BET specific surface area was selected as a candidate for further investigations. The thermal stability of the selected sample was investigated by thermogravimetric analysis (TGA). Scanning electron microscopy (SEM) was used to characterize the sample morphology. XRD results showed that the sample synthesized over the shortest time corresponded to MIL-101(Cr), while the sample synthesized over the longest time was in agreement with MIL-53(Al). Samples synthesized for time periods between these two limits were assumed to be composites of both MIL-53(Al) and MIL-101(Cr). TGA results indicated that the hybrid materials were thermally stable at temperatures about 100 degrees C higher than for pure MIL-101(Cr). The BET specific surface area (1746 m(2) g(-1)) and CO2 adsorption capacity (16 mmol g(-1)) of the selected hybrid sample were about 50% and 35% higher, respectively, compared with those of pure MIL-53(Al), but 30% and 20% lower, respectively, compared with those of pure MIL-101(Cr). Binary adsorption modeling showed the high selectivity of the MIL-101(Cr) and MIL-53(Al) hybrid material for CO2 with a minimum separation factor of about 60 at 298 K. This value was much higher than those reported previously and those observed in this work for the original MIL-101(Cr) or MIL-53(Al). These results demonstrated that the hybrid of MIL-101(Cr) and MIL-53(Al) was a promising material for selective CO2 capture from natural and biogas.
机译：在该研究中，使用水热法在各种时间段内合成纳米孔MIL-101（Cr）和MIL-53（A1）的杂种，范围为8至40小时。制备的材料以粉末X射线衍射（PXRD）和元素分析为特征，并且使用Brunauer-Emmett-Teller（Bet）方法，通过N-2吸附测量它们的比表面积。为了研究这些材料的实际应用，使用体积法测定样品的纯二氧化碳和样品的甲烷吸附能力。 Langmuir模型用于适合CO2和CH4等温线。扩展的Langmuir（EL）方程和理想的吸附解决方案理论（IAST）模型用于获得CO2 / CH4选择性。选择具有最高的BET比表面积的样品作为进一步研究的候选者。通过热重分析（TGA）研究所选样品的热稳定性。扫描电子显微镜（SEM）用于表征样品形态。 XRD结果表明，在最短时间内合成的样品对应于MIL-101（CR），而在最长时间合成的样品与MIL-53（AL）一致。假设在这两个限制之间合成的时间段的样品是MIL-53（Al）和MIL-101（CR）的复合材料。 TGA结果表明，杂化材料在高于纯MIL-101（Cr）的温度高约100℃的温度下热稳定。与那些相比，所选杂合样品的BET比表面积（1746μm（2）g（-1））和CO 2吸附容量（16mmol g（-1））分别为约50％和35％，与纯MIL-101（Cr）相比，纯MIL-53（A1），但分别降低30％和20％。二元吸附建模显示MIL-101（Cr）和MIL-53（Al）杂化材料的高选择性CO 2，最小分离因子为约60，在298k中。该值远高于先前报告的值，并且观察到的值远高得多在这项工作中，用于原始MIL-101（CR）或MIL-53（AL）。这些结果表明MIL-101（Cr）和MIL-53（Al）的杂种是一种有希望的材料，用于从天然和沼气中选择性CO2捕获。

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