负载铁的废弃大孔吸附树脂热分解动力学研究

以废弃D-101型大孔吸附树脂为对照，以Fe^3＋作催化剂，采用热重法（TG）研究了铁负载量分别为0．5％、3．0％、5．0％和8．0％的废弃D-101型大孔吸附树脂的热分解特性．实验结果表明：铁负载量为5％以下时有利于树脂在600℃以下热分解，其中铁负载量为0．5％的树脂在600℃以下失重率最大，且催化剂的用量最小，为最佳催化浓度．用TG．DTG法对5个不同铁负载量的树脂在非等温条件下进行热分解动力学研究，把从TG．DTG曲线中取得的数据和30个不同的方程采用Achar微分法和Madhusudanan-Krishnan-Ninan（MKN）积分法对其进行非等温分解动力学研究，得到动力学参数（表观化学能E和指前因子A）和分解动力学机理及方程．得出结论：未负载铁的树脂和铁负载量分别为3．O％、8．0％的树脂的热分解动力学方程为doddti=Aexp（-E/RT）^1/3。（1-α）[-1n（1-α]^-2，铁负载量分别为0．5％和5．0％的树脂的热分解动力学方程为dα/dt=A exp（-E/RT）^2（1-α）^3/2，后者的分解符合Chemical reaction机理．

Study on Decomposition Kinetics of Macro Absorption Resin Supported by Iron-Based Catalysts

With Fe^3＋ as catalyst,the thermal behaviors of D-101 macro absorption resin supported by iron-based cata- lyst （with iron loading of 0 wt %, 0.5 wt %, 3.0 wt %, 5.0 wt% and 8,0 wt % individually and their decomposition kinetics have been investigated under non-isothermal conditions by means of thermogravimetry （TG）. The thermal characteristics have been determined by using the TG-DTG technology. Within the temperature of 600,below 5.0 wt % of iron loading was benefit to the thermal decomposition of the resin. The highest mass loss of them was with 0.5 wt % of iron loading. The iron con- tent was lowest and the best concentration of catalyst. The non-isothermal kinetics of these resins was studied by use of nonisothermal TG and DTG curves. The non-isothermal kinetics data were analyzed by means of Achar differential method and Madhusudanan-Krishnan-Ninan （MKN） integral method. The possible reaction mechanisms have been investigated by comparing the kinetics parameters. The kinetic equations for the resins with 0 wt%, 3.0 wt% and 8.0 wt% of iron can be expressed as dα/dt = A exp （-E/RT）^1/3 （1-α） [-In （1-α） ]^-2. The kinetic equations for the resins with 0.5 wt% and 5.0 wt% of iron can be expressed as dα/dt =A exp （-E/RT）^2 （1-α） ^3/2 ,which accord the Chemical reaction mechanism.