TPD characterization of surface adsorption sites of model Ziegler-Natta polymerization catalysts

Seong Han Kim, Gabor A. Somorjai

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


The surface adsorption sites of titanium chloride films that can be used as model Ziegler-Natta polymerization catalysts have been investigated with temperature-programmed desorption (TPD) of various probe molecules. The adsorption sites can be differentiated depending on the heat of desorption of the molecule. Two titanium chloride films were produced by electron-induced chemical vapor deposition of TiCl4 and co-deposition of Mg and TiCl4 on gold substrates. The surfaces of both films were chlorine-terminated. 1,3,5-Trimethylbenzene (mesitylene) was found to be an effective and non-destructive molecule for TPD characterization of adsorption sites on the model catalysts. The film produced by the electron-induced chemical vapor deposition had a distribution of adsorption sites that were not thermodynamically stable and subject to high-temperature annealing, while the film prepared by the co-deposition had a stable surface structure that was composed of domains of the MgCl2(001) basal plane structure.

Original languageEnglish (US)
Pages (from-to)333-339
Number of pages7
JournalApplied Surface Science
Issue number3
StatePublished - Jul 2 2000

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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