A reference high-pressure CH4 adsorption isotherm for zeolite Y: results of an interlaboratory study

Huong Giang Nguyen ,H Wang,Junyoung Hwang ,Stefano Brandani ,Emilio Napolitano ,Shigehiro Yamakita ,Marek Bielewski ,Christopher M Sims ,Riaz Ahmad ,Marjorie A Nicholson ,Satyannarayana Edubilli ,Heng Jiang ,Martina Švábová ,Yoshinao Nakada ,Marcus Lange ,Ronny Pini ,Theodore Steriotis ,Jens Möllmer ,Gino V Baron ,Nicolas Heymans ,Timothy J Mays ,Toru Shigeoka ,Darren P Broom ,Sasidhar Gumma ,Roger D Van Zee ,Matthias Thommes ,Enzo Mangano ,Mi Tian ,Michael J Benham ,Joaquín Silvestre-Albero ,Maryna Vorokhta ,F Dreisbach,Eric Bovens ,Daniela Řimnáčová ,Judit Farrando-Pérez ,Kiyoshi Nakai ,Joeri Denayer ,Masako Hakuman ,Anne Dailly ,Carlos Cuadrado-Collados ,Jarod C Horn ,Armin D Ebner ,James A Ritter ,Blaza Toman ,Christos Tampaxis ,Guy De Weireld

doi:10.1007/s10450-020-00253-0

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 methane adsorption isotherms on NIST Reference Material RM 8850 (Zeolite Y), at 25 °C up to 7.5 MPa. Twenty laboratories participated in the study and contributed over one-hundred adsorption isotherms of methane on Zeolite Y. From these data, an empirical reference equation was determined, along with a 95% uncertainty interval (Uk=2). By requiring participants to replicate a high-pressure reference isotherm for carbon dioxide adsorption on NIST Reference Material RM 8852 (ZSM-5), this interlaboratory study also demonstrated the usefulness of reference isotherms in evaluating the performance of high-pressure adsorption experiments.

Highlights

Adsorbents have many potential applications, ranging from fluid catalytic cracking to gas separation and storage, to environmental remediation (Yang 2003)
The C O2/ZSM-5 reference isotherm recently proved helpful for advancing modeling methods (Fang et al 2020)
The present study builds on the CO2/ ZSM-5 reference isotherm work

Summary

Introduction

Adsorbents have many potential applications, ranging from fluid catalytic cracking to gas separation and storage, to environmental remediation (Yang 2003). The NIST Facility for Adsorbent Characterization and Testing (FACT Lab) led an interlaboratory study (hereafter, ILS1) on the measurement of high-pressure surface excess carbon dioxide (CO2) adsorption isotherms on NIST Reference Material RM 8852, ammonium ZSM-5, at 20 °C up to 4.5 MPa (Nguyen et al 2018). Working through Technical Working Group 39 of the Versailles Project on Advanced Materials and Standards (VAMAS), the FACT Lab organized a second high-pressure interlaboratory study (hereafter, ILS2) to investigate the usefulness of the CO2/ZSM-5 reference isotherm in evaluating the performance of high-pressure adsorption instruments and to determine a reference isotherm for methane (CH4) adsorption on NIST Reference Material RM 8850, sodium Zeolite Y (ZY)..

Methods

Data evaluation

Dataset display

Reference function determination

Results and discussions

Conclusions and outlook