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催化剂能降低化学反应的活化能从而提高反应速率,对反应途径有特殊的选择性。本文研究了二氧化碳激光器产生的红外激光对 NH_3和 SF_6在热金属丝表面上分解反应的影响,以及 TEACO_2激光单脉冲诱发的 NH_3一O_2复相爆炸反应。在 NH_3体系的实验中,使 CW CO_2激光束穿过钨丝圈而不触及钨丝,发现在热分解温度阈值以下,一旦用红外激光辐照,分解反应立即发生,如停止辐照,反应也就停止。在 SF_6体系的实验中,研究了 SF_6在多晶纯铂丝表面上的热分解反应动力学。当 SF_6的压力在0.050—0.15托之间,测得分解反应的起始温度为900℃左右。当铂丝温度在900—1050℃范围内,反应速率与 SF_6的压力呈一级反应关系,测得反应表现活化能为19.6千卡/摩尔。在
Catalysts can reduce the activation energy of chemical reactions to improve the reaction rate, the reaction pathway has a special selectivity. In this paper, the effects of infrared laser generated by carbon dioxide laser on the decomposition reaction of NH_3 and SF_6 on the surface of hot metal wire and the NH_3-O_2 complex explosion reaction induced by TEACO_2 laser single pulse were studied. In the experiment of NH3 system, the CW CO2 laser beam was passed through the tungsten wire without touching the tungsten wire. It was found that the decomposition reaction occurred immediately after irradiation with infrared laser below the thermal decomposition temperature threshold, Stop In the experiment of SF_6 system, the thermal decomposition kinetics of SF_6 on the surface of polycrystalline pure platinum wire was studied. When the pressure of SF_6 is between 0.050-0.15 torr, the initial temperature of decomposition reaction is about 900 ℃. When the platinum wire temperature is in the range of 900-1050 ℃, the reaction rate is in first order with the pressure of SF_6, and the activation energy of the reaction is 19.6 kcal / mol. in