Temperature programmed desorption of triethylamine from differently pretreated Pd/Al2O3 catalysts

M. Skotak, J. Kijeński, Z. Karpiński

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The temperature programmed desorption (TPD) of triethylamine from alumina and two alumina-supported palladium catalysts of different metal loadings (0.3 and 2.77 wt.% Pd) confirmed the presence of strong Lewis acid sites in the samples subjected to high temperature reduction at 600°C. With increasing temperature during thermodesorption, triethylamine adsorbed on Lewis acid sites of alumina undergoes transformation, leading to desorption of several products, among which hydrogen, ethylene and acetonitrile predominate. However, introduction of increasing amounts of palladium to alumina makes the acidity probing difficult, because a considerable part of adsorbed triethylamine is decomposed on metal sites. Temperature programmed oxidation (TPO) shows that the organic coke left after TPD of triethylamine is associated with acid sites of alumina, not with palladium sites. Another observation that pure alumina and 0.3 wt.% Pd/Al2O3 retained larger amounts of coke than the 2.77 wt.% Pd/Al2O3 catalyst reveals a beneficial role of palladium in desorbing organic material in the course of TPD runs.

Original languageEnglish (US)
Pages (from-to)757-765
Number of pages9
JournalPolish Journal of Chemistry
Volume77
Issue number6
StatePublished - Jun 1 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Keywords

  • Alumina
  • Effect of pretreatment
  • Lewis acid sites
  • Pd/AlO
  • Temperature programmed desorption (TPD)
  • Temperature programmed oxidation (TPO)
  • Triethylamine

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