Microgravimetric Analysis Method for Activation-Energy Extraction from Trace-Amount Molecule Adsorption

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• 作者：Pengcheng Xu ; Haitao Yu ; Xinxin Li
• 刊名：Analytical Chemistry
• 出版年：2016
• 出版时间：May 3, 2016
• 年：2016
• 卷：88
• 期：9
• 页码：4903-4908
• 全文大小：358K
• 年卷期：0
• ISSN：1520-6882

文摘

Activation-energy (E_a) value for trace-amount adsorption of gas molecules on material is rapidly and inexpensively obtained, for the first time, from a microgravimetric analysis experiment. With the material loaded, a resonant microcantilever is used to record in real time the adsorption process at two temperatures. The kinetic parameter E_a is thereby extracted by solving the Arrhenius equation. As an example, two CO₂ capture nanomaterials are examined by the E_a extracting method for evaluation/optimization and, thereby, demonstrating the applicability of the microgravimetric analysis method. The achievement helps to solve the absence in rapid quantitative characterization of sorption kinetics and opens a new route to investigate molecule adsorption processes and materials.