Solid-State and Gas-Phase NMR Spectroscopy as a Combined Method for Characterizing Physical and Chemical Adsorption of CO2 in Novel Cements and other Adsorbent Materials

Description:
Over the last several years our group has developed nuclear magnetic resonance (NMR) techniques for obtaining highly accurate, low uncertainty composition determinations for mixtures of gases and multiphase systems. In this presentation we describe how we are applying this approach, in combination with solid-state NMR spectroscopy, to measure adsorption of gases (e.g. CO2) by adsorbent materials (e.g. novel cements). In broad terms, vapor-phase NMR measurements allow us to monitor the total adsorptive capacity of the adsorbent materials for an initial loading pressure and temperature and to determine the rate of the interaction, quantitatively. These measurements can be done for pure CO2 or CO2 within multicomponent mixtures. Solid-state NMR spectroscopy provides evidence for the mechanism of the adsorption interaction such as distinguishing between chemical and physical adsorption as well as being a useful tool for confirming the adsorptive capacities determined using vapor-phase NMR. The method’s utility is also demonstrated for quantitating the carbonate content in “real-world” industrial cement samples.

Speaker: Jason Widegren - National Institute of Standards and Technology
Dr. Suiter is a staff scientist at the National Institute of Standards and Technology. Dr. Suiter utilizes nuclear magnetic resonance (NMR) spectroscopy to study problems in solids, liquids, and gases.