Thermal stability of ZIF-8 membranes for gas separations

Joshua B. James, Jerry Lin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The thermal stability of ZIF membranes is important for high temperature separation applications but has not been systematically studied. This work highlights the results of a thermal stability study of ZIF-8 membranes in terms of material structure, H2/CO2 gas permeation and separation characteristics. During binary and single gas temperature dependent permeance tests conducted from 25 to 250 °C, both H2 and CO2 permeances decrease as a function of temperature. In the binary test, H2/CO2 selectivity increases between 25 and 225 °C, and then decreases as temperature is further increased between 225–275 °C. The results can be explained by the adsorption/diffusion mechanism. Beyond 275 °C, H2/CO2 permeance and selectivity drastically increase with respect to temperature and is indicative of ZIF-8 membrane partial carbonization during the dynamic 30 h temperature dependent test. The time/temperature dependency of the onset of ZIF-8 thin film structural change was deconvoluted in isothermal transient permeation experiments. Transient tests performed at 50, 100, 150 and 300 °C for 24 h indicate that ZIF-8 thin films maintain their crystallinity and structural integrity below 150 °C. However, at temperatures of 150 °C and greater the framework undergoes increased magnitudes of thermally induced carbonization as a function of temperature. Thermomechanically induced stresses between the ZIF-8 membrane thin film and α–alumina support may account for differences in static thermal stability observed when comparing ZIF-8 membranes and ZIF-8 crystalline powders.

Original languageEnglish (US)
Pages (from-to)9-19
Number of pages11
JournalJournal of Membrane Science
Volume532
DOIs
StatePublished - Jun 15 2017

Fingerprint

Thermodynamic stability
thermal stability
Hot Temperature
Gases
membranes
Membranes
Temperature
gases
carbonization
temperature
Carbonization
thin films
selectivity
Permeation
Thin films
static stability
gas temperature
integrity
Aluminum Oxide
crystallinity

Keywords

  • Gas separation
  • High temperature
  • Membrane carbonization
  • Thermal stability
  • ZIF-8 membrane

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Cite this

Thermal stability of ZIF-8 membranes for gas separations. / James, Joshua B.; Lin, Jerry.

In: Journal of Membrane Science, Vol. 532, 15.06.2017, p. 9-19.

Research output: Contribution to journalArticle

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