Using TGA-FTIR to Determine Kinetic Parameters of Coal Macerals
- Received Date: 1996-09-12
- Publish Date: 1997-04-10
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Key words:
- coal macerals /
- TGA一TIR pyrolysis /
- natural gas generation /
- kinetic parameter
Abstract: Kinetic parameters of kerogen pyrolysis have been widely used in basin modelling. Because the de-tection of gas products is more difficult than that of liquid products in thermal simulation experiments,the study of natural gas generation is random. The combination of TG( thermogravimetric)analysis with Fourier transform infrared(FTIR) spec-troscopy analysis was used to analyze different coal macerals and detect the pyrolysis products. The powdered samples were grogerssively heatedcatra to of 25℃/minute) and weighted in theT G A. A carrier gas transported the effluent through a multipass gas cell for continuos analysis by FTIRSelected infrared absorption bands were used to detect different compounds. Data were captured foraliphatics, aromatics, cardon dioxide and methane. The analytical results indicated that different coal macerals have different characters in pyrolysis. Hydrocarbon generation can be modelled by assuming that a number of parallel first grder reactions control the thermal decomposition of kerogen. Issler's optimization software was used to derive kineticparameters from the digitized pyrolysis traces. Kinetic solutions from TGA-FTIR data yield equations forspecial products. Inputting this equatioins into a numerical modelling package such as BASINMO D, alongwith other information, the generation of methane, aliphatics etc.coilld be predicted.
Citation: | Zhang Ying, Jiang Zhusheng, Lloyd Snow done, Dale Isslere. Using TGA-FTIR to Determine Kinetic Parameters of Coal Macerals[J]. Acta Sedimentologica Sinica, 1997, 15(2): 122-125. |