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在前一工作中,我们探讨了乙苯在 ZnO—Al_2O_(?)—CaO 型催化剂上脱氢时,能否达成平衡的问题。实验结果证明,苯乙烯收率和按公式:K_p=x(n_3-n_2+x)/((n_1+n_2-x)[n_1+n_2+(n_3-n_2+x)+n_4])(1)计算所得的平衡收率完全—致。根据热力学原理,对体积增大的反应(乙苯脱氢时体积是增加的),在平衡条件下,减低反应系统的压力,将更便于生成产物。因此,在乙苯脱氢时,降低系统的压力或在反应系统内添加惰性稀释剂,都有利于提高苯乙烯的收率。文
In the previous work, we explored whether the balance of ethylbenzene can be achieved when dehydrogenating ZnO over Al 2 O 3 -CuO catalysts. The experimental results show that the yield of styrene is calculated according to the formula: K_p = x (n_3-n_2 + x) / (n_1 + n_2-x) [n_1 + n_2 + (n_3-n_2 + x) + n_4] The resulting equilibrium yield is perfect. According to the thermodynamic principle, the reaction to the increase of volume (the volume of ethylbenzene dehydrogenation is increased), under the equilibrium condition, the pressure of the reaction system is reduced and the product will be easier to produce. Therefore, in the dehydrogenation of ethylbenzene, reducing the pressure of the system or adding inert diluent in the reaction system will help to improve the yield of styrene. Text