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 (U_k=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.

本文报告了由美国国家标准技术研究院（NIST）牵头进行的一项国际实验室间研究的结果，该研究涉及在25°C以上的NIST参考材料RM 8850（沸石Y）上测量高压表面多余的甲烷吸附等温线。至7.5 MPa。20个实验室参与了这项研究，并贡献了甲烷在沸石Y上的一百个吸附等温线。从这些数据中，确定了一个经验参考方程，以及95％的不确定区间（U _{k = 2}）。通过要求参与者在NIST参考材料RM 8852（ZSM-5）上复制用于二氧化碳吸附的高压参考等温线，该实验室间研究还证明了参考等温线在评估高压吸附实验性能方面的有用性。