用过渡应答法研究了乙烯、苯在HZSM—5分子筛催化剂上烷基化反应机理。实验表明,在345℃时,乙烯吸附于催化剂上,苯在催化剂上为弱吸附。乙苯生成后立即从表面脱附,任何中间物都无动力学意义的吸附,都不构成控制步骤。这一结果解释了前述动力学方程。 在反应与接近反应温度下,主要吸附物乙烯在催化剂表面的吸附速度可以用耶洛维奇方程描述,并求得了有关的耶洛维奇参量。 The mechanism of alkylation of ethylene and benzene over HZSM-5 molecular sieve was studied by means of transitional response method. Experiments show that at 345 ℃, ethylene is adsorbed on the catalyst, benzene is weakly adsorbed on the catalyst. Ethylbenzene is desorbed from the surface immediately after it is generated, and there is no kinetic adsorption of any intermediates, neither of which constitutes a control step. This result explains the aforementioned kinetic equation. At the reaction temperature and near the reaction temperature, the adsorption rate of ethylene, the main adsorbate on the catalyst surface, can be described by the equation of YELLOWVICH and the related YELLOWVIC parameters are obtained.