374944 A New Commercial Instrument for Gas Sorption Measurements Under Extreme Conditions

Tuesday, November 18, 2014
Galleria Exhibit Hall (Hilton Atlanta)
Darren P. Broom, Richard Murden, Mark Roper and Michael J. Benham, Hiden Isochema Ltd, Warrington, United Kingdom

A new commercial microbalance has been developed in order to characterize the gas sorption properties of adsorbents under a range of challenging conditions. The instrument, called the XEMIS, features a new type of microbalance in which the sensitive detection and control components are located outside the main chamber of a symmetrical beam balance. The design allows the gravimetric measurement of the adsorption and desorption of a range of gas species, including corrosives, at pressures of up to 200 bar and temperatures of 500°C. To demonstrate its operation, we have performed measurements on a series of samples under different conditions of temperature and pressure. We have selected a Metal-Organic Framework (MOF), a shale and a zeolite. We present hydrogen adsorption and desorption isotherms on a 50 mg sample of Na-X zeolite up to 150 bar at 77 K, high resolution SO2 adsorption and desorption isotherms on a novel MOF (NOTT-300) at sub-ambient pressure and a range of near-ambient temperatures, and CH4 adsorption isotherms up to 100 bar on a shale. These data demonstrate the operation of the XEMIS for the characterization of different types of adsorbent for a range of practical gas adsorption applications.

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