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采用 TG-DTG法确定了三水氟化铝的热分解过程分三步进行 ,求得了第一步脱水反应的表观活化能( E)和指前因子 ( A)分别为 4 1 .9k J/mol和 1 0 2 .49s- 1 ;第二步脱水反应的 E为 4 7.5k J/mol,其非等温动力学方程为 -ln( 1 -α) =A· exp( -E/RT)· t;在 3 80℃以上 ,Al F3发生水解反应 ,其 E和非等温动力学方程分别是 80 .4 k J/mol和 [-ln( 1 -α) ]23=A· exp( -E/RT)· t.当第二步脱水反应与水解反应在 3 80～ 550℃同时发生时 ,脱水反应比水解反应更易进行 .
TG-DTG method was used to determine the thermal decomposition process of aluminum trihydrate, which was carried out in three steps. The apparent activation energy (E) and pre-exponential factor (A) of the first step dehydration reaction were found to be 4 1 .9k J / mol and 1 0 2 .49s-1; the second step dehydration reaction E is 4 7.5k J / mol, its non-isothermal kinetic equation is -ln (1 -α) = A · exp (-E / RT) · T; at above 380 ℃, Al F3 undergoes hydrolysis reaction, the E and non-isothermal kinetic equations are respectively 80.4 kJ / mol and [-ln (1 -α)] 23 = A · exp / RT) · t. When the second step dehydration reaction and the hydrolysis reaction occur simultaneously at 380 ~ 550 ° C, the dehydration reaction proceeds more easily than the hydrolysis reaction.