Application of TG-FTIR to study SO2 evolved during the thermal decomposition of coal-derived pyrite
Cheng, Hongfei, Liu, Qinfu, Huang, Man, Zhang, Shilong, & Frost, Ray L. (2013) Application of TG-FTIR to study SO2 evolved during the thermal decomposition of coal-derived pyrite. Thermochimica Acta, 555, pp. 1-6.
The thermal decomposition of the coal-derived pyrite was studied using thermogravimetry combining with Fourier-transform infrared spectroscopy (TG-FTIR) techniques to gain knowledge on the SO2 gas evolution process and formation mechanism during the thermal decomposition of the coal-derived pyrite. The results showed that the thermal decomposition of the coal-derived pyrite which started at about 400 ◦C was complete at 600 ◦C; the gas evolved can be established by combining the DTG peak, the Gram–Schmidt curve and in situ FTIR spectroscopic evolved gas analysis. It can be observed from the spectra that the pyrolysis products for the sample mainly vary in quantity, but not in species. It was proposed that the oxidation of the coal-derived pyrite started at about 400 ◦C and that pyrrhotite and hematite were formed as primary products. The SO2 released by the thermal decomposition of the coal-derived pyrite mainly occurred in the first pyrolysis stage between 410 and 470 ◦C with the maximum rate at 444 ◦C. Furthermore, the SO2 gas evolution and formation mechanism during the thermal decomposition of the coal-derived pyrite has been proposed.
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|Item Type:||Journal Article|
|Keywords:||Coal-derived pyrite, Thermal decomposition, Gas evolution, TG-FTIR|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||© 2013 Elsevier B.V. All rights reserved|
|Deposited On:||04 Apr 2013 03:50|
|Last Modified:||25 Apr 2013 13:45|
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