Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 42,
  • Issue 7,
  • pp. 1268-1273
  • (1988)

Laser-Induced Photochemical Reactions of Methanol, Ethanol, 1-Propanol, and 2-Propanol

Not Accessible

Your library or personal account may give you access

Abstract

This study focuses on the carbon dioxide laser-induced excitation and resultant dissociation of several members of a group of carbon-oxygen (C-O)-containing molecules, the alcohols methanol, ethanol, 1-propanol, and 2-propanol. The tunable continuous-wave infrared (cw) laser provides the energy of activation necessary for dissociation to occur after absorption into the C-O stretching fundamentals of the alcohols. Chemical reactions were monitored with the use of Fourier transform infrared spectroscopy, also used for identification of end products. After irradiation, ethanol and 1-propanol each yielded acetaldehyde. The products of the dissocation of methanol were carbon monoxide, formaldehyde, and hydrogen. The formaldehyde then reacted with excess methanol to produce methoxymethanol. Fourier transform interferograms were collected at specific time intervals, thus monitoring any consecutive reactions that occurred after the irradiation. For methanol, laser parameters such as output line frequency and power as well as irradiation time were varied. The effect of initial reactant pressure on the laser-induced dissociation of methanol was evaluated. Only methanol underwent a consecutive reaction. Hydrocarbon fragments were also observed from ethanol, 1-propanol, and 2-propanol. Methane, ethene, and ethyne were produced from ethanol. Propene, ethene, and methane were produced from 1-propanol, and methane and propene from 2-propanol. The products observed in some instances were different from those reported in the literature for pyrolytic and pulsed laser studies. The results from these investigations are compared with results from other similar compounds and similar techniques.

PDF Article
More Like This
Determination of 1-propanol, ethanol, and methanol concentrations in water based on a one-dimensional phoxonic crystal sensor

Samar M. Shaban, Ahmed Mehaney, and Arafa H. Aly
Appl. Opt. 59(13) 3878-3885 (2020)

Laser-Induced Chemical Reactions

N. V. Karlov
Appl. Opt. 13(2) 301-309 (1974)

Soret effect and photochemical reaction in liquids with laser-induced local heating

L. C. Malacarne, N. G. C. Astrath, A. N. Medina, L. S. Herculano, M. L. Baesso, P. R. B. Pedreira, J. Shen, Q. Wen, K. H. Michaelian, and C. Fairbridge
Opt. Express 19(5) 4047-4058 (2011)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved