(571f) Measurements of Binary Adsorption Isotherms on Ammonium ZSM-5 Zeolite

Quantifying the true amount of gas adsorbed within a porous material in the presence of competing species is essential to determine the extent to which the presence of competitive species affect the sorption/separation properties. However, a major challenge to the advancement of adsorption-based separation systems is the limited binary adsorption data in the literature.^{1, 2} The lack of static multicomponent adsorption data can be attributed, in part, to the lack of instrumentation among researchers in the field and difficulty of the measurements. As a part of on-going efforts at the National Institute of Standards and Technology (NIST) to develop reference data, measurement protocols and recommendations for adsorption measurements,^3-6 NIST Reference Material 8852 (ammonium ZSM-5)⁷ was chosen as a model material to measure binary adsorption isotherms. Experiments involving various gas pairs carried out using the two combined tools, i.e., the combined gravimetric/manometric instrument and the combined manometric/gas chromatography instrument, which allow results to be cross checked, will be detailed and discussed.

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