TPD characterization of surface adsorption sites of model Ziegler–Natta polymerization catalysts
Kim, SH; Somorjai, GA
| HERO ID | 854054 |
|---|---|
| In Press | No |
| Year | 2000 |
| Title | TPD characterization of surface adsorption sites of model Ziegler–Natta polymerization catalysts |
| Authors | Kim, SH; Somorjai, GA |
| Journal | Applied Surface Science |
| Volume | 161 |
| Issue | 3-4 |
| Page Numbers | 333-339 |
| Abstract | 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. (C) 2000 Elsevier Science B.V. All rights reserved. |
| Doi | 10.1016/s0169-4332(00)00131-8 |
| Wosid | WOS:000088701500005 |
| Url | http://linkinghub.elsevier.com/retrieve/pii/S0169433200001318 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | Ziegler-Natta catalyst; adsorption site; temperature-programmed desorption; chemical vapor deposition; TiCl4; MgCl2 |
| Is Qa | No |