A reference high-pressure CO2 adsorption isotherm for ammonium ZSM-5 zeolite: results of an interlaboratory study

Nguyen H. G. T., Espinal L., van Zee R. D., Thommes M., Toman B., Hudson M. S. L., ...More

ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY, vol.24, no.6, pp.531-539, 2018 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 6
  • Publication Date: 2018
  • Doi Number: 10.1007/s10450-018-9958-x
  • Journal Name: ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.531-539
  • Keywords: Carbon dioxide, High-pressure adsorption isotherm, Interlaboratory study, Reference adsorbent material, Reference isotherm, RM 8852, Surface excess adsorption, ZSM-5, HYDROGEN SORPTION PROPERTIES, CARBON-DIOXIDE CAPTURE, COAL
  • Çanakkale Onsekiz Mart University Affiliated: No

Abstract

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 A degrees 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 [n (ex) -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 (U (k = 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.