Abstract
Abstract Anhydrous calcium nitrate melts at 836 ± 2 K and subsequent decomposition occurs in the liquid phase. The temperature of NO−3 anion breakdown under dynamic rising temperature conditions increases with the heating rate, being 949 K at 10 K min−1. Kinetic studies of this pyrolysis are reported from observations obtained by two complementary isothermal techniques. From measurements of gaseous product evolution in an evacuated constant volume apparatus between 773 and 820 K (this reaction is approximately summarised as Ca ( NO 3 ) 2 → CaO + 1( 1 2 ) NO 2 + O 2 + ( 1 4 ) N 2 ) it was shown that data were well expressed by the Avrami-Erofe'ev equation (n = 2) and the activation energy (E) was 229 ± 10 kJ mol−1 between 0·10 Some environmental implications of these observations are discussed that may be of value in the development of technology for use in pollution abatement by removal of NOx from industrial flue gases.
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