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A reference high-pressure CO2 adsorption isotherm for ammonium ZSM-5 zeolite: results of an interlaboratory study.
- Source :
- Adsorption; Aug2018, Vol. 24 Issue 6, p531-539, 9p
- Publication Year :
- 2018
-
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 °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,<inline-graphic></inline-graphic> [n<subscript>ex</subscript>-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<subscript>k = 2</subscript> = 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09295607
- Volume :
- 24
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Adsorption
- Publication Type :
- Academic Journal
- Accession number :
- 131319881
- Full Text :
- https://doi.org/10.1007/s10450-018-9958-x