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Thermal decomposition of KClO4 catalyzed by MnO2-CuO mixed oxides systems

1988; Elsevier BV; Volume: 126; Linguagem: Inglês

10.1016/0040-6031(88)87245-9

1872-762X

A.M. El-Awad, A.A. Said, K. M. Abd El‐Salaam,

Catalytic Processes in Materials Science

The catalytic effect of a mixed oxides system, consisting of MnO2-CuO in different atomic ratios (Cu/(Cu+Mn) = x, where x = 0-1), on the non-isothermal decomposition of KClO4 has been studied. The results are discussed according to an electron transfer mechanism. The enhancement effect of trace Cu(II) added to the host oxide MnO2 was attributed to an increase of the exchange capacity of manganese cations between the different oxidation states, while the retarding effect associated with Cu(II)-rich samples was attributed to the trapping of the electrons required to initiate the decomposition reaction by the holes created. On the basis of the applicability of a non-isothermal kinetic equation, it was demonstrated that two main stages are involved in the decomposition process.