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Ⅰ.在不同長短的鎢絲及銅絲上进行了不同初压的氨在不同溫度时的分解研究。Ⅱ.研究了856°—1277℃間十个温度的分解情况,发現鎢絲温度在≤1100℃时反应呈零級,温度自1200℃起呈半級。钼絲在800—850°K时零級,925—1400°K則 呈半級。并这結果与絲的長短无关,在三根不同長短的鎢絲上得到同样的結果。Ⅲ.对于鎢絲上的零級反应,log t∞(1/T),符合Arrhenius方程式,得到E_a=E=37KCal.。而当温度升高,反应变为半級时,E_a(?)0。这些結果亦与鎢絲的長短无关。Ⅳ.在級数变化的同时显示活化能(E_n)的变化,可通过吸附的飽和与否以及作用物吸附时的热效应来得到解釋。Ⅴ.假定吸附解离成NH_3+2M=MNH_2+MH,并假定MNH_2的分解是决定反应速度的一步,則不論吸附平衡是否比分解要来得快,都能解釋我們实驗中的反应级数。
Ⅰ. Decomposition of ammonia with different initial pressures at different temperatures on different lengths of tungsten and copper wires. Ⅱ. The decomposition of ten temperatures between 856 ° -1277 ° C was studied. It was found that the reaction temperature was zero when the temperature of tungsten filament was ≤ 1100 ° C, and the temperature was half-degree from 1200 ° C. The molybdenum wire is zero at 800-850 ° K and half at 925-1400 ° K. And this result has nothing to do with the length of the wire, in the three different lengths of tungsten wire to get the same result. Ⅲ. For the zero-order reaction on tungsten wire, log t∞ (1 / T), which accords with Arrhenius equation, can get E_a = E = 37KCal. When the temperature rises, the reaction becomes half-level, E_a (?) 0. These results also have nothing to do with the length of the tungsten wire. IV. Changes in series while showing changes in activation energy (E n) can be explained by the saturation of the adsorption and the thermal effects of the adsorbate. V. Assuming that the adsorption-dissociation is NH3 + 2M = MNH2 + MH, and assuming that the decomposition of MNH2 is a step in determining the reaction rate, the reaction order in our experiment can be explained whether or not adsorption equilibrium is faster than decomposition.