A series of Pt/HPMo/SBA-15 catalysts with the pore size as a single variable were prepared to elucidate the internal diffusion effect on the hydrotreatment of n-C16. A novel model was developed to calculate the Weisz-Prater number (N_W-P) because the traditional model relies on excessive empirical reference values and affects the accuracy remarkably. The utilization of the internal effectiveness factor, Thiele modulus, and the apparent activities over catalysts with different diffusion capacity gave rise to N_W-P with improved accuracy, which can also be extended to other heterogeneous catalytic systems with macromolecules as reactants. Combining the novel model with the diffusion–reaction kinetic method, a conclusion has been drawn that the formation of m-i-C16 is more susceptible to internal diffusion than the consumption of n-C16. Besides, the pore size should be not less than 10 nm to avoid the step-limitation of internal diffusion, in the premise of adequate acid sites.

中文翻译：

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N-C16 在 Pt/HPMo/SBA-15 上的加氢处理和使用新 WP 准则的扩散效应研究

制备了一系列以孔径为单一变量的 Pt/HPMo/SBA-15 催化剂，以阐明内扩散对 n-C16 加氢处理的影响。由于传统模型依赖过多的经验参考值并显着影响精度，因此开发了一种新的模型来计算Weisz-Prater数（N _W-P）。利用内部有效性因子、蒂勒模量和不同扩散能力的催化剂的表观活性产生了 N _W-P具有更高的准确性，也可以扩展到其他以大分子为反应物的多相催化体系。将新模型与扩散反应动力学方法相结合，得出的结论是，mi-C16 的形成比 n-C16 的消耗更容易受到内部扩散的影响。此外，孔径应不小于10 nm，以避免内部扩散的阶梯式限制，前提是有足够的酸位。