FTIR (Fourier Transform Infrared) and FTNMR (Fourier Transform Nuclear Magnetic Resonance) Study of Organophosphorus Surface Reactions

Abstract

Fourier transform infrared (FTIR) and Fourier transform nuclear magnetic resonance (FTNMR) methods were used to examine the adsorption and reaction of diisopropyl fluorophosphate (DFP) on various solid adsorbents. Static and flow system experiments were monitored using FTIR to determine DFP adsorption rates and isotherms on silica, coated silicas, gamma-alumina, coated aluminas, and activated charcoal. The adsorption of DFP(g) onto the solid adsorbents was generally very rapid, with a half-life of 20 seconds for 1 mg DFP onto 25 mg of 350 sq. m/g silica. The DFP adsorption isotherm on silica indicated chemi-sorption to a monolayer at P/Po <0.6, followed by increased coverage that appears to be physical adsorption. Diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, photoacoustic spectroscopy (PAS), and solid state 31P NMR of adsorbed DFP showed chemisorption on silica and on alumina. Bonding at the P=O of DFP was indicated by a -41/cm shift in the NU(P=O) and a 1 ppm upfield shift in the 31 P resonance.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1987
Accession Number
ADA188337

Entities

People

  • Melvin P. Nadler
  • Richard A. Hollins
  • Robin A. Nissan

Organizations

  • Naval Air Weapons Station China Lake

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Adsorbents
  • Adsorption
  • Chemical Reactions
  • Chemical Shifts
  • Chemistry
  • Desorption
  • Frequency
  • Gas Chromatography
  • Humidity
  • Hydrolysis
  • Isotherms
  • Magnetic Resonance
  • Materials
  • Nuclear Magnetic Resonance
  • Particle Size
  • Resonance
  • Surface Reactions

Readers

  • Analytical Chemistry
  • Electrochemical Engineering/ Fuel Cell Technologies
  • Organic Chemistry