Dynamics of high pressure gas adsorption on carbon based adsorbents and its application in separation processes

Ali Qajar, Maryam Peer, Ramakrishnan Rajagopalan, Henry C. Foley

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Adsorptive properties of PFA-derived carbon adsorbents were studied by measuring high pressure adsorption of light gases. A high pressure volumetric gas adsorption apparatus was designed such that it was sensitive enough to accurately capture adsorption uptake of light gases at room temperature. A list of gases, ranging from He to SF 6, provided different kinetic diameters to study entropic effects during process of adsorption. Besides, enthalpic effects arising from differences in chemical structure of gas molecules, such as acidic, basic and polarity were investigated. A correlation between collected adsorption data and the structure of carbon material was developed. Pore structures of PFA-derived carbons were analyzed by nitrogen and CO 2 porosimetry methods determining that poresize of carbons were all below 10 Å. That small poresize, in most cases, prevented adsorption of more than 1 layer of adsorbate molecules on the adsorbent surface. By using this fact, the role of mutual interactions between adsorbate-adsorbate molecules relative to the overall force field energy was determined. For heavier gases mutual interaction terms were not negligibl.

Original languageEnglish (US)
Title of host publication11AIChE - 2011 AIChE Annual Meeting, Conference Proceedings
StatePublished - Dec 1 2011
Event2011 AIChE Annual Meeting, 11AIChE - Minneapolis, MN, United States
Duration: Oct 16 2011Oct 21 2011

Other

Other2011 AIChE Annual Meeting, 11AIChE
CountryUnited States
CityMinneapolis, MN
Period10/16/1110/21/11

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)

Fingerprint Dive into the research topics of 'Dynamics of high pressure gas adsorption on carbon based adsorbents and its application in separation processes'. Together they form a unique fingerprint.

Cite this