Comparison of dinitrogen, methane, carbon monoxide, and carbon dioxide mass-transport dynamics in carbon and zeolite molecular sieves

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Equilibrium (based on Henry constants) and kinetic (based on relaxation-time constants or rather macropore transport diffusivities) selectivities for commercial zeolite and carbon-molecular-sieve (CMS) adsorbents were compared. Adsorption isotherms were recorded at -20°. The frequency-response (FR) sorption-rate spectra were determined in the range of -78 and 70° at 133 Pa. In particles of a larger size than 1.0 mm, macropore diffusion governed the rate of sorption mass transport in both types of microporous materials. The differences in the intercrystalline diffusivities established the kinetic separation of the gases notwithstanding the essential importance of interactions in the micropores. Zeolites seem to be more advantageous for a dynamic separation of CO2 and CH4 than CMS 4A. With the CO2 and CO pair, the CMS is characterized by short characteristic times which, together with a good separation factor, is a double advantage in a short-cycle adsorption technology. Upon comminution of the carbon pellets, intercrystalline-diffusion resistance can be completely removed by using CMS 4A adsorbent particles with a diameter smaller than 1 mm. The carbonization of spruce-wood cubes resulted in an excellent carbon honeycomb structure, which seems to be ideal from a dynamic point of view for applications in short-cycle adsorption-separation technologies. In the development of adsorbents, the use of the FR method can be beneficial.

Original languageEnglish
Pages (from-to)206-217
Number of pages12
JournalHelvetica Chimica Acta
Volume94
Issue number2
DOIs
Publication statusPublished - Feb 2011

Fingerprint

Zeolites
Methane
Molecular sieves
absorbents
Carbon Monoxide
Carbon Dioxide
Carbon monoxide
carbon monoxide
carbon dioxide
Carbon dioxide
Carbon
methane
Mass transfer
carbon
adsorbents
Adsorbents
Adsorption
sorption
frequency response
adsorption

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry
  • Catalysis
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

@article{f68104799eea4c48b7cd11c892699e61,
title = "Comparison of dinitrogen, methane, carbon monoxide, and carbon dioxide mass-transport dynamics in carbon and zeolite molecular sieves",
abstract = "Equilibrium (based on Henry constants) and kinetic (based on relaxation-time constants or rather macropore transport diffusivities) selectivities for commercial zeolite and carbon-molecular-sieve (CMS) adsorbents were compared. Adsorption isotherms were recorded at -20°. The frequency-response (FR) sorption-rate spectra were determined in the range of -78 and 70° at 133 Pa. In particles of a larger size than 1.0 mm, macropore diffusion governed the rate of sorption mass transport in both types of microporous materials. The differences in the intercrystalline diffusivities established the kinetic separation of the gases notwithstanding the essential importance of interactions in the micropores. Zeolites seem to be more advantageous for a dynamic separation of CO2 and CH4 than CMS 4A. With the CO2 and CO pair, the CMS is characterized by short characteristic times which, together with a good separation factor, is a double advantage in a short-cycle adsorption technology. Upon comminution of the carbon pellets, intercrystalline-diffusion resistance can be completely removed by using CMS 4A adsorbent particles with a diameter smaller than 1 mm. The carbonization of spruce-wood cubes resulted in an excellent carbon honeycomb structure, which seems to be ideal from a dynamic point of view for applications in short-cycle adsorption-separation technologies. In the development of adsorbents, the use of the FR method can be beneficial.",
author = "G. Onyesty{\'a}k",
year = "2011",
month = "2",
doi = "10.1002/hlca.201000204",
language = "English",
volume = "94",
pages = "206--217",
journal = "Helvetica Chimica Acta",
issn = "0018-019X",
publisher = "Verlag Helvetica Chimica Acta AG",
number = "2",

}

TY - JOUR

T1 - Comparison of dinitrogen, methane, carbon monoxide, and carbon dioxide mass-transport dynamics in carbon and zeolite molecular sieves

AU - Onyestyák, G.

PY - 2011/2

Y1 - 2011/2

N2 - Equilibrium (based on Henry constants) and kinetic (based on relaxation-time constants or rather macropore transport diffusivities) selectivities for commercial zeolite and carbon-molecular-sieve (CMS) adsorbents were compared. Adsorption isotherms were recorded at -20°. The frequency-response (FR) sorption-rate spectra were determined in the range of -78 and 70° at 133 Pa. In particles of a larger size than 1.0 mm, macropore diffusion governed the rate of sorption mass transport in both types of microporous materials. The differences in the intercrystalline diffusivities established the kinetic separation of the gases notwithstanding the essential importance of interactions in the micropores. Zeolites seem to be more advantageous for a dynamic separation of CO2 and CH4 than CMS 4A. With the CO2 and CO pair, the CMS is characterized by short characteristic times which, together with a good separation factor, is a double advantage in a short-cycle adsorption technology. Upon comminution of the carbon pellets, intercrystalline-diffusion resistance can be completely removed by using CMS 4A adsorbent particles with a diameter smaller than 1 mm. The carbonization of spruce-wood cubes resulted in an excellent carbon honeycomb structure, which seems to be ideal from a dynamic point of view for applications in short-cycle adsorption-separation technologies. In the development of adsorbents, the use of the FR method can be beneficial.

AB - Equilibrium (based on Henry constants) and kinetic (based on relaxation-time constants or rather macropore transport diffusivities) selectivities for commercial zeolite and carbon-molecular-sieve (CMS) adsorbents were compared. Adsorption isotherms were recorded at -20°. The frequency-response (FR) sorption-rate spectra were determined in the range of -78 and 70° at 133 Pa. In particles of a larger size than 1.0 mm, macropore diffusion governed the rate of sorption mass transport in both types of microporous materials. The differences in the intercrystalline diffusivities established the kinetic separation of the gases notwithstanding the essential importance of interactions in the micropores. Zeolites seem to be more advantageous for a dynamic separation of CO2 and CH4 than CMS 4A. With the CO2 and CO pair, the CMS is characterized by short characteristic times which, together with a good separation factor, is a double advantage in a short-cycle adsorption technology. Upon comminution of the carbon pellets, intercrystalline-diffusion resistance can be completely removed by using CMS 4A adsorbent particles with a diameter smaller than 1 mm. The carbonization of spruce-wood cubes resulted in an excellent carbon honeycomb structure, which seems to be ideal from a dynamic point of view for applications in short-cycle adsorption-separation technologies. In the development of adsorbents, the use of the FR method can be beneficial.

UR - http://www.scopus.com/inward/record.url?scp=79951862420&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79951862420&partnerID=8YFLogxK

U2 - 10.1002/hlca.201000204

DO - 10.1002/hlca.201000204

M3 - Article

VL - 94

SP - 206

EP - 217

JO - Helvetica Chimica Acta

JF - Helvetica Chimica Acta

SN - 0018-019X

IS - 2

ER -