Initiation of ammonium perchlorate-Ignition by chromic oxidetitanium dioxide catalysts

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Abstract

The effect of p-type chromic oxide and n-type titanium dioxide on the initiation of the explosion of ammonium perchlorate has been studied. On addition of chromic oxide the explosion temperature of ammonium perchlorate is decreased by about 160° to 180° C. In order to clarify the role of chromic oxide, the effect of its electronic properties on the explosion of ammonium perchlorate was studied. Experiments have shown that the defect electron concentration of chromic oxide is decisive. The electron conductor titanium dioxide proved in practice to be an ineffective substance, even when tungsten oxide, aluminium oxide and beryllium oxide were incorporated in titanium dioxide in order to alter the electron concentration. The explosion temperature was, however, decreased by about 150° C when titanium dioxide was doped with a small amount of chromic oxide. This was attributed to the formation of chromic ions of higher valency in the surface of titanium dioxide (defect conducting layer). The critical temperature for the explosion of ammonium perchlorate has been determined, in the presence of both substances, as well as the activation energy of the process which leads to the explosion. Values of activation energy agree with those corresponding to the electron transfer mechanism of decomposition of ammonium perchlorate, and experimental results have been interpreted in this sense.

Original languageEnglish
Pages (from-to)141-148
Number of pages8
JournalCombustion and Flame
Volume9
Issue number2
DOIs
Publication statusPublished - Jun 1965

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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