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首页> 外文会议>North American Thermal Analysis Society conference >Combined Calorimetric and Manometric Studies of Porous Silica and Metal Organic Frameworks (MOFs) for the Adsorption of Carbon Dioxide and Hydrogen Gases
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Combined Calorimetric and Manometric Studies of Porous Silica and Metal Organic Frameworks (MOFs) for the Adsorption of Carbon Dioxide and Hydrogen Gases

机译：多孔二氧化硅和金属有机骨架（MOF）的热量和压力的联合研究吸附二氧化碳和氢气

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Study of materials to evaluate their adsorption/desorption properties is of great interest to the researcher for a variety of applications, such as catalysis, hydrogen storage, C02 sequestration, etc. These materials include zeolites, metal-organic frameworks (MOFs), porous silica, and activated carbons, to name a few. Calorimetry and thermal analysis combined with manometry can be a great tool to measure the quantity of gas adsorbed, the kinetics of sorption, energetics of interactions, and surface properties of materials. In this work, we will highlight how our manometry instrument, PTC Pro, can be coupled with a variety of Setaram calorimeters including C80, Sensys Evo, BT 2.15, and microcalorimeters to study metal-organic framework, and porous silica for the adsorption of gases (e.g., carbon dioxide and hydrogen gas). For example, CO2 gas adsorption over amine-modified mesostructured silica (MCM-41-N2 and MCM-41-N3) was studied using PCT Pro coupled with a Setaram calorimeter. When used in conjunction with the PCT Pro, calorimeter allowed the determination of heat evolved after each dose. In addition, differences in the adsorption behavior of both materials were observed due to the presence of the different functional group. The evaluation of heatflow data and gas sorption quantity was used to differentiate the chemi- and physi-sorption behavior of the gas over both materials. The CO2 adsorption was also studied over a commercially available MOF, Basolite C 300 Cu-BTC using PCT Pro coupled with a Setaram calorimeter. The material was evaluated at -20, 30, and 50 °C with CO2 pressure ranging from 0 to 35 bar. The isosteric heats of adsorption were obtained with an average value of 15.52 kJ/mol of CO2. A commercially available MOF-5 was analyzed using PCT Pro coupled with a Setaram calorimeter for hydrogen (H2) sorption at 87 K. The calorimetric data was used to determine the integral heat of adsorption to be equal to -4.19 kJ/mol.
机译：研究材料以评估其吸附/解吸性能对于研究人员在各种应用中具有极大的兴趣，例如催化，氢存储，CO 2隔离等。这些材料包括沸石，金属有机骨架（MOF），多孔二氧化硅和活性炭，仅举几例。量热法和热分析与测压法相结合，可以成为测量吸附气体量，吸附动力学，相互作用能和材料表面性能的理想工具。在这项工作中，我们将重点介绍如何将测压仪PTC Pro与各种Setaram量热仪（包括C80，Sensys Evo，BT 2.15和微量热仪）结合使用，以研究金属有机骨架以及用于吸附气体的多孔二氧化硅（例如二氧化碳和氢气）。例如，使用PCT Pro和Setaram量热仪研究了胺改性的介孔结构二氧化硅（MCM-41-N2和MCM-41-N3）上的CO2气体吸附。与PCT Pro结合使用时，量热仪可以确定每次剂量后放出的热量。另外，由于存在不同的官能团，因此观察到两种材料的吸附行为不同。对热流数据和气体吸附量的评估用于区分两种材料上气体的化学吸附和物理吸附行为。还使用PCT Pro和Setaram量热计在市售MOF Basolite C 300 Cu-BTC上研究了CO2吸附。在-20、30和50°C且CO2压力为0至35 bar的条件下评估了该材料。获得的等排吸附热平均值为15.52 kJ / mol CO2。使用PCT Pro和Setaram量热计分析了市售的MOF-5在87 K时的氢（H2）吸附。量热数据用于确定整体吸附热等于-4.19 kJ / mol。

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