Abstract:

The thermal decomposition reaction of bismuth citrate in a temperature-programmed mode was investigated by TG-DTG, DSC and heating in-situ cell FTIR. The decomposition mechanism was proposed, and the kinetic parameters of the major decomposition reaction were calculated. The apparent activation energy and pre-exponential factor of the major decomposition reaction of bismuth citrate are 213.82 kJ/mol and 1 016.48 s^-1 respectively. The kinetic equation of the major decomposition process can be expressed as:dα/dt=1016.48exp(-2.56188×10 ⁴/T)[-ln(1-α)^2/3]. The catalytic performance of CIT-Bi in the combustion of double-base propellant was also investigated. The result shows that CIT-Bi possesses a good catalytic function. It can markedly increase the burning rate of double-base propellant and reduce pressure exponent. Especially, when CIT-Bi together with a little carbon black(CB) is used, the catalytic efficiency is higher.

Key words: Bismuth citrate; Thermal analysis; Thermal decomposition kinetics; RSFTIR; Catalytic effect