Swensen, MR
1993
Mineral Matter Catalysis During High- and Low-Temperature Char Oxidation of Lignite Chars
Cope, R.F.; Swensen, M.R. and Hecker, W.C.
Proceedings of 7th Annual International Conference on Coal Science, Banff, Alberta, Canada, September 1993. Funded by US Department of Energy and ACERC.
Many researchers have studied the impact of mineral catalysis, particularly by CaO, on the low-temperature (<=750 K) oxidation rates of synthetic and low rank coal-derived chars. Fewer have studied Ca effects during high-temperature (>=1300 K) char oxidation. The objectives of this ongoing study are to determine (1) the significant of CaO catalysis during the oxidation of a lignite char at both high and low particle temperatures, and (2) the effect of high-temperature burnout level on oxidation rates and CaO catalysis. Three char series, with and without potentially catalytic metal ions, were prepared. High-temperature rates and particle temperatures were measured for each in a drop-tube reactor. Low-temperature (intrinsic) rates and activation energies were determined using isothermal TGA. Changes in char densities and surface areas (N2, CO2, and CaO) were also measured and related to changes in the observed oxidation rates.
Swensen, MR
1993
Mineral Matter Catalysis During High- and Low-Temperature Char Oxidation of Lignite Chars
Cope, R.F.; Swensen, M.R. and Hecker, W.C.
Proceedings of 7th Annual International Conference on Coal Science, Banff, Alberta, Canada, September 1993. Funded by US Department of Energy and ACERC.
Many researchers have studied the impact of mineral catalysis, particularly by CaO, on the low-temperature (<=750 K) oxidation rates of synthetic and low rank coal-derived chars. Fewer have studied Ca effects during high-temperature (>=1300 K) char oxidation. The objectives of this ongoing study are to determine (1) the significant of CaO catalysis during the oxidation of a lignite char at both high and low particle temperatures, and (2) the effect of high-temperature burnout level on oxidation rates and CaO catalysis. Three char series, with and without potentially catalytic metal ions, were prepared. High-temperature rates and particle temperatures were measured for each in a drop-tube reactor. Low-temperature (intrinsic) rates and activation energies were determined using isothermal TGA. Changes in char densities and surface areas (N2, CO2, and CaO) were also measured and related to changes in the observed oxidation rates.