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

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)11391-11396
Number of pages6
JournalJournal of Physical Chemistry B
Volume107
Issue number41
Publication statusPublished - Oct 16 2003
Externally publishedYes

Fingerprint

Zeolites
Alkenes
molecular relaxation
Hydroxyl Radical
alkenes
Olefins
Desorption
desorption
Infrared radiation
pulses
life (durability)
Absorption spectra
Ethylene
ethylene
absorption spectra
Infrared lasers
Infrared absorption
Laser modes
propylene
infrared lasers

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Dynamic processes of olefins adsorbed on hydroxyl groups of DM20 zeolite excited by picosecond infrared pulses : Vibrational relaxation, short-lived species and desorption. / Onda, Ken; Tanabe, Kinuka; Noguchi, Hidenori; Domen, Kazunari; Wada, Akihide.

In: Journal of Physical Chemistry B, Vol. 107, No. 41, 16.10.2003, p. 11391-11396.

Research output: Contribution to journalArticle

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AU - Domen, Kazunari

AU - Wada, Akihide

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AB - 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.

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