Application of TG-FT-i.r. to study hydrocarbon structure and kinetics

✍ Scribed by Robert M. Carangelo; Peter R. Solomon; Dennis J. Gerson

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 988 KB
• Volume: 66
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(87)90336-x

✦ Synopsis

For the characterization of fossil fuels, thermal analysis methods have proved to be a useful technique for probing the organic and mineral composition of these typically insoluble materials. This paper describes a new instrument which couples the~ogravimetric (TG) analysis with evolved product analysis performed with a Fourier Transform infrared (FT4.r.) spectrometer. A unique feature of the system is its ability to provide continuous monitoring (during pyrolysis or other reactions) of the i.r. spectra of evolving products which are condensable at room temperature, as well as quantitative analysis of gases. The complementary TG-FT-i.r.

data provide a wealth of information regarding composition, structure and kinetics of hydrocarbons. The FT-i.r. technique offers advantages compared with g.c. in speed, and compared with g.c. and m.s. in the ability to monitor heavy tarry materials. FT-i.r. studies of chars and tars at various stages of pyrolysis by KBr pellets show what functional groups in the sample have changed after specific pyrolysis products have been released. This apparatus has been used to analyse coai, char, tar, lignins, wood, polymers, * The samples were supplied by Ron Liotta of the Exxon Corporation by methods described in, Liotta, R. Fuel 1979,58, 724