Kinetics of desorption of hexane from the microporous metal organic framework RPM-1

M. Smith, J. T. Culp, E. Bittner, B. Parker, Jing Li, B. Bockrath

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Abstract

The kinetics of desorption of hexane from the microporous metal framework RPM-1 has been studied using a pulse mass analyzer. In this method a small sample of organic liquid was injected into a heated carrier gas that passes through a packed bed of adsorbent. The change in mass of the bed with time was observed following the adsorption of the pulse. RPM-1 is a microporous material of the general formula [M3(bpdc)3(bpy)] · 4DMF · H2O, where M is either Co or Zn, bpdc is biphenyl dicarboxylate and bpy is 4,4′-bipyridine. The pores are channels of larger supercages (11 × 11 × 5 Å) connected by smaller windows of approximately 8 Å diameter. The desorption of hexane was well represented by a combination of two first order processes. Activation energies determined for the two processes over a temperature range of 373-473 K were 56 and 63 kJ/mol for RPM-1 (Co). The two activation energies are similar to isosteric heats of adsorption measured independently in earlier work at corresponding coverages. Similar values were found for RPM-1 (Zn). The pulse mass analyzer was found to be an effective way to investigate the dynamics of adsorption processes.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalMicroporous and Mesoporous Materials
Volume106
Issue number1-3
DOIs
Publication statusPublished - Nov 1 2007

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Keywords

  • Desorption
  • Hexane
  • Kinetics
  • Metal organic framework
  • Pulse mass analyzer

ASJC Scopus subject areas

  • Catalysis
  • Materials Science(all)

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