英语语法分析

The intraparticle diffusion was not the only control step.

颗粒内扩散不是吸附过程唯一的控制步骤。

The experimental results show that the adsorption velocity is controlled by intraparticle diffusion.

实验结果表明，吸附速度受粒内扩散所控制。

The second and third fractions were mesopore and micropore diffusion respectively, and the intraparticle diffusion was the control step.

第二和第三阶段分别是中孔和微孔扩散过程，颗粒内扩散为速率控制步骤。