Metal salts of other sulphuroxyacids

Few kinetic studies of the decompositions of these salts are available and, of those which have been investigated, the sulphites have received greatest attention. In general, sulphites disproportionate [803] in an inert atmosphere to sulphides and sulphates, the latter decomposing at a higher temperature. 

Na2S03 and P04 E in the presence of P04 was reduced to 138 kJ mole 1. A decomposition mechanism involving the intervention of S0 3 radicals has been proposed. 

The first step in barium sulphite disproportionation in dry nitrogen [806], 803—1073 K, is considered [807] to be 

Susumov et al. [806] report an activation energy of 99 kJ mole 1, which is far below that found by Mocekand Erdos [808] (E = 257 kJ mole 1) based on the temperature dependence between 951 and 967 K, of k in the rate equation 

At 951 K, the reaction rate is directly proportional to Ph2o a catalytic effect that is attributed [808] to the role of water as an oxygen carrier. The reaction rate was also influenced by the method of salt preparation but for a given sample the effect of particle size was small. 

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