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推导的单中心异相同位素氧交换反应的微分动力学式可代替传统的积分动力学式。应用 新法只由反应初始阶段的实验曲线即可计算出各种重要动力学参数,较传统方法节省时间,简 化试验,计算结果也更准确。对在交换速度不同的双中心上进行的异相同位素氧交换反应提 出了一种可行的动力学处理方法。当快速交换过程达到平衡后,慢过程可用微分动力学方程 式按均匀交换体系进行处理;快交换过程的速度常数可由算得的固相中~(18)O浓态变化求出。本 法不需作近似性的假设。并分别以La_(0.2)Ca_(0.8)MnO_3和Fe_(0.7)Sb_(0.3)O_x两种氧化物为例对上述二 法进行了说明。
Derivation of the single center isotope oxygen exchange reaction differential kinetic equation can replace the traditional integral kinetic equation. Applying the new method, the important kinetic parameters can be calculated only from the experimental curve at the initial stage of the reaction, which saves time and simplifies the test compared with the traditional method. The calculation result is also more accurate. A feasible kinetic method is proposed for the heterogeneous isotope oxygen exchange reaction on bicomponents with different exchange speeds. When the rapid exchange process reaches equilibrium, the slow process can be solved by the uniform exchange system with the differential kinetic equation. The speed constant of the fast exchange process can be obtained from the calculated change of the concentration of ~ (18) O in the solid phase. This Law does not require approximation assumptions. The above two methods are described by taking La_ (0.2) Ca_ (0.8) MnO_3 and Fe_ (0.7) Sb_ (0.3) O_x as examples.