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A Reference High-Pressure CO2 Adsorption Isotherm for Ammonium ZSM-5 Zeolite: Results of an Interlaboratory Study

Research output: Contribution to journalArticle

  • Huong Giang T. Nguyen
  • Laura Espinal
  • Roger D. van Zee
  • Matthias Thommes
  • Blaza Toman
  • M. Sterlin L. Hudson
  • Darren P. Broom
  • Michael J. Benham
  • Katie Cychosz
  • Pieter Bertier
  • Feng Yang
  • Bernhard M. Krooss
  • Rebecca L. Siegelman
  • Masako Hakuman
  • Kazuyuki Nakai
  • Armin D. Ebner
  • Lutfi Erden
  • James A. Ritter
  • Aaron Moran
  • Orhan Talu
  • Krista S. Walton
  • Pierre Billemont
  • Guy De Weireld

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Original languageEnglish
Pages (from-to)531–539
Issue number6
Early online date26 Jul 2018
Publication statusE-pub ahead of print - 26 Jul 2018


This paper reports the results of an international interlaboratory study led by the National Institute of Standards and Technology (NIST) on the measurement of high-pressure surface excess carbon dioxide adsorption isotherms on NIST Reference Material RM 8852 (ammonium ZSM-5 zeolite), at 293.15 K (20 °C) from 1 kPa up to 4.5 MPa. Eleven laboratories participated in this exercise and, for the first time, high-pressure adsorption reference data are reported using a reference material. An empirical reference equation nex=d(1+exp[(−ln(P)+a)/b ])c , [nex-surface excess uptake (mmol/g), P-equilibrium pressure (MPa), a = −6.22, b = 1.97, c = 4.73, and d = 3.87] along with the 95% uncertainty interval (Uk = 2 = 0.075 mmol/g) were determined for the reference isotherm using a Bayesian, Markov Chain Monte Carlo method. Together, this zeolitic reference material and the associated adsorption data provide a means for laboratories to test and validate high-pressure adsorption equipment and measurements. Recommendations are provided for measuring reliable high-pressure adsorption isotherms using this material, including activation procedures, data processing methods to determine surface excess uptake, and the appropriate equation of state to be used.

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