2-巯基吡啶镉(Ⅱ)、汞(Ⅱ)配合物的热分解动力学研究

Thermal Decomposition Kinetics of Complexes of 2-Mercaptopyridine with Cd(Ⅱ),Hg(Ⅱ)

采用TG-DTG技术研究了2-巯基吡啶镉(Ⅱ)、汞(Ⅱ)配合物在氮气气氛中的热分解机理及非等温动力学。采用积分法(Coats-Refern方程,HM方程,MKN方程)和微分法(Achar方程)对非等温动力学数据进行了分析,得到了配合物第一步热分解反应的机理函数、动力学参数和热分解动力学方程。结果表明:其热分解过程属F2(化学反应)机理控制,非等温热分解的动力学方程为dα/dT=A/β.e-E/RT(1-α)2,其中镉(Ⅱ)配合物的表观活化能E=86.35 kJ/mol,指前因子A=4.72×107s-1;汞(Ⅱ)配合物的表观活化能E=189.67 kJ/mol,指前因子A=3.79×1018s-1。

The thermal decomposion of the complexes of 2-chloropyridine with Cd（Ⅱ）, Hg（ Ⅱ ） and their non-isothermal kinetics were studied by TG-DTG technique. The non-isothermal kinetic data were analyzed with three kinds of integral methods （Coat-Redfern equation, HM equation, MKN equation） and a differential method （Achar equation）. The mechanism function and kinetic parameters of the thermal decomposition in the first step were obtained. Chemical reaction mechanism （F2） controlled the first thermal decomposition process. The kinetic equation may be expressed as：da/dT=A/β·e^-E/RT（1-α）^2. The apparent activation energy and the pre-exponential factor were 86. 35 kJ/mol and 4. 72 ）〈 10^7 s^-1, Cd（Ⅱ）; 189.67 kJ/mol and 3. 79×10^18s^-1 Hg（ Ⅱ） respectirely.