Equilibrium Adsorption Measurements of Pure Nitrogen, Carbon Dioxide, and Methane on a Carbon Molecular Sieve at Cryogenic Temperatures and High Pressures

Abstract

A detailed experimental study of the adsorption behavior at equilibrium of pure nitrogen, methane, and carbon dioxide gases on a commercial carbon molecular sieve (Shirasagi MSC 3K-161) is reported at temperatures between 115 K to 323 K and pressures up to 5 MPa. A volumetric-type apparatus was used to obtain over 200 excess (Gibbs) adsorption capacity data over this range of pressure and temperature with an estimated uncertainty of 4 %. The absolute adsorption isotherms were type I in the IUPAC classification with the adsorption capacity at constant pressure increasing significantly with decreasing temperature. For each gas, the adsorption data were regressed to a four parameter Toth equation to represent the temperature and pressure dependence of the data with a relative standard uncertainty of 4 %. The optimized parameters from the Toth equation included the isosteric enthalpies of adsorption that were 17 kJ·mol−1, 27 kJ·mol−1, and 18 kJ·mol−1 for N2, CO2, and CH4, respectively.

Measurements of helium adsorption on natural clinoptilolite at temperatures from (123.15 to 423.15) K and pressures up to 35 MPa

“…A schematic of the custom built volumetric adsorption apparatus is shown in Figure 1. The construction and operation of this apparatus is described in detail elsewhere [12][13][14] . Here, we provide a brief description of the key features of this apparatus, the procedures followed to calibrate its internal volumes, and the experimental workflow used to measure helium adsorption.…”

“…Watson et al 12 showed that the dilation of the adsorption and loading cells with pressure contributes a negligible uncertainty to the volume of either cell.…”

Modeling of molecular gas adsorption isotherms on porous materials with hybrid PC-SAFT–DFT

“…Zhou et al [54] measured CH 4 adsorption on activated carbon AX-21 in a wide temperature range from 233 to 333 K and up to 10 MPa. Watson et al [55] measured the adsorption of pure CH 4 , N 2 and CO 2 on a carbon molecular sieve MSC 3K-161 at temperatures from 115 to 323 K and up to 5 MPa. Meanwhile, Savitz et al [56] measured the adsorption isotherms of CH 4 , C 2 H 6 and C 3 H 8 on highsilica zeolites.…”

Gas adsorption separation of CO2/CH4 system using zeolite 5A

“…Over the years, many researchers have studied pure and binary adsorption of carbon dioxide and methane on different commercial adsorbents, such as zeolite 13X [6], activated carbon [7], carbon molecular sieve [8], ZSM-5 [9], and synthesized adsorbents such as zeolite T [10] and zeolite β [2].…”