Dynamic processes of olefins adsorbed on hydroxyl groups of DM20 zeolite excited by picosecond infrared pulses: Vibrational relaxation, short-lived species and desorption

Ken Onda, Kinuka Tanabe, Hidenori Noguchi, Kazunari Domen, Akihide Wada

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

We have investigated olefins adsorbed on Brønsted acidic hydroxyl groups (OD) of DM20 zeolite by transient infrared absorption spectra after excitation of the OD stretching mode using picosecond infrared lasers. The olefins studied were ethylene, deuterated ethylene, propylene, and isobutene, and only isobutene was adsorbed on OD at its methyl group while the other olefins were adsorbed at their double bonds. For all the olefins except isobutene, simple vibrational relaxation of the ν = 1 state was observed and the lifetimes were 2-4 ps. These lifetimes are an order faster than that of isolated OD. For isobutene, a long lifetime component lasting more than 500 ps was observed in addition to vibrational relaxation of 2 ps. The transient absorption spectra for isobutene-adsorbed zeolite at various time delays and frequencies indicated the existence of a short-lived species and a slow desorption process compared with vibrational relaxation.

本文言語英語
ページ(範囲)11391-11396
ページ数6
ジャーナルJournal of Physical Chemistry B
107
41
DOI
出版ステータス出版済み - 10 16 2003
外部発表はい

All Science Journal Classification (ASJC) codes

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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