High pressure N2/CH4 adsorption measurements in clinoptilolites

✍ Scribed by E. Kouvelos; K. Kesore; T. Steriotis; H. Grigoropoulou; D. Bouloubasi; N. Theophilou; S. Tzintzos; N. Kanelopoulos

• Book ID: 104055453
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 278 KB
• Volume: 99
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/j.micromeso.2006.07.036

✦ Synopsis

The ability of clinoptilolite, a naturally occurring zeolite, to separate a nitrogen/methane gas mixture was studied experimentally. High-pressure nitrogen and methane adsorption isotherms at 273 and 298 K were measured for the raw material as well as for monovalent (Li + and Na + ) cation exchanged derivatives. The raw material showed promising results as a potential sorbent for kinetic pressure swing adsorption (PSA) processes. The type and population distribution of the charge-balancing cations affect significantly the adsorption and kinetic characteristic of the clinoptilolite samples. Both N 2 and CH 4 diffusion is activated, and thus sorption kinetics are a strong function of temperature. Based on our experimental data CH 4 is more hindered and its mobility is significantly decreased at low temperatures. In this respect a kinetic PSA with fast cycles at low temperatures seems favourable.