An in situ infrared spectroscopic investigation of the pyrolysis of ethylene glycol encapsulated in silica sodalite.
The thermal stability and pyrolysis of ethylene glycol (EG) encapsulated in the sodalite cages of all-silica sodalite were studied by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and transmission infrared spectroscopy. Evidence for the presence of encapsulated CO2 formed as a result of partial decomposition of EG molecules was observed starting at about 600 K. Complete, irreversible pyrolysis of the EG occurred between 675 and 775 K. After treatment at 775 K, the CO2 remained encapsulated in the sodalite framework, even though there were spectroscopic indications that the pyrolysis caused a disordering of the sodalite framework. There appeared to be a temperature dependence of the conformational interactions of the EG O---H groups up to 600 K, which was mainly manifested as a weakening of intramolecular hydrogen bonding. The only detectable encapsulated products of the EG decomposition in an inert (N2 or Ar) environment were CO2 and a carbonaceous (coke- or soot-like) residue. There was no evidence of other encapsulated products, such as CO, H2, H2O, or light hydrocarbons.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 949328
- Report Number(s):
- ANL/CMT/JA-40014; VISPEK; TRN: US201012%%126
- Journal Information:
- Vibrational Spectroscopy, Vol. 27, Issue 1 ; Nov. 29, 2001; ISSN 0924-2031
- Country of Publication:
- United States
- Language:
- ENGLISH
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