rate-determining step of reaction

This fact shows that the third step of reaction process is the rate control step.

上述事实说明反应的第三步是速控步骤。

The chloromethylation reaction consists of electrophilic substitution reaction and nucleophilic substitution reaction, the nucleophilic substitution is the rate-controlling step and the hydroxymethyl cation (+ CH20H) is the really effective electrophile.

氯甲基化反应由亲电取代反应和亲核取代反应组成，亲核取代反应是反应的速率控制步骤，羟甲基碳正离子（+CH2OH）；是真正有效的亲电试剂。

In this method, the decomposition of BaCO-3, which is the major reaction rate limiting step in the conventional solid state reaction process, is excluded and so the sintering temperature and holding time required for the completion of the reaction decrease.

本方法不包括传统反应法中限制反应速率的BaCO3分解反应，因而与传统固态反应法相比，其合成温度及保温时间大大降低，从而可以合成超细粉末。

The results showed that the second elementary reaction was the key step to the reaction of rate, and its activation barrier leading to 2,6-dichloropyridine was the lowest among the four reaction paths.

结果表明，不同产物以生成2,6-二氯吡啶的活化能最低。

The shortcomings of the one-step reaction mechanism and the differences among different chemical reaction rate formulae were exhibited by simulating a one-dimensional laminar premixed flame using detailed and one-step reaction mechanisms.

为了解单步反应机理的不足及其不同速率表达式之间的差异，分别采用详细和单步化学反应机理数值模拟了甲烷一维层流预混火焰。