Details

Autor(en) / Beteiligte

• Nguyen, H. G. T.
• Espinal, L.
• van Zee, R. D.
• Thommes, M.
• Toman, B.
• Hudson, M. S. L.
• Mangano, E.
• Brandani, S.
• Broom, D. P.
• Benham, M. J.
• Cychosz, K.
• Bertier, P.
• Yang, F.
• Krooss, B. M.
• Siegelman, R. L.
• Hakuman, M.
• Nakai, K.
• Ebner, A. D.
• Erden, L.
• Ritter, J. A.
• Moran, A.
• Talu, O.
• Huang, Y.
• Walton, K. S.
• Billemont, P.
• De Weireld, G.

Titel

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

Ist Teil von

• Adsorption : journal of the International Adsorption Society, 2018, Vol.24 (6), p.531-539

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 n e x = d ( 1 + exp [ - ln ( P ) + a / b ] ) c , [ 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.