Abstract
The influence of preparation atmospheres and doping of metal ions on the catalytic activity of α-Fe 2O 3 on the thermal decomposition of KClO 4 was investigated by means of DTA and X-ray techniques. Oxygen, air and nitrogen were used as preparation atmospheres, and Li +, Mg 2+, Cu 2+, Ti 3+, B 3+, Al 3+ and Si 4+ were doping agents. The catalytic activity, wich was indicated with the initial decomposition temperature ( T i) of KClO 4-α-Fe 2O 3 mixture (1:1 by wt), was increased by preparing the oxide in oxygen atmosphere rather than in air or nitrogen and by doping of Li +, Mg 2+ and Cu 2+. The tri-valent ions showed no effect and Si 4+ showed the inhibition effect on the activity. The specific surface area and the crystalline size of α-Fe 2O 3 were found to have no relation to T i value. It was considered that the enhanced activity results from the p-type semiconductivity of the oxides prepared by calcination in oxygen atmosphere and by doping of lower valent ions.
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