Simulating the properties of small pore silica zeolites using interatomic potentials.

Area of Science:

• Materials Science
• Computational Chemistry
• Chemical Engineering

Background:

• Force field methodologies are crucial for studying silica (SiO(2)) polymorphs, yet comprehensive reviews are scarce.
• Pure silica zeolites (zeosils) are vital for hydrocarbon separations, particularly small-pore variants with 8-ring windows.
• Accurate prediction of zeosil properties, especially pore size, is essential for optimizing separation processes.

Purpose of the Study:

• To address the literature gap by evaluating classical force fields for pure silica zeolites.
• To assess the accuracy and transferability of selected force fields in predicting structural, mechanical, and dynamical properties.
• To determine the performance of these force fields in simulating the selective diffusion of C3 hydrocarbons in small-pore zeosils.

Main Methods:

• Selection of relevant classical force fields from existing literature.
• Application of selected force fields to simulate pure silica zeolites, with a focus on small-pore structures.
• Analysis of predicted properties including cell parameters, Si-O distances, and pore size.
• Evaluation of force field performance in modeling C3 hydrocarbon diffusion and separation.

Main Results:

• The study identifies the strengths and limitations of various force fields in reproducing key structural properties of pure silica zeolites.
• Accuracy in predicting pore size and related parameters is critically assessed for its impact on hydrocarbon diffusion.
• Force field performance varies, highlighting the need for careful selection based on the specific application, such as C3 hydrocarbon separation.

Conclusions:

• Classical force fields can be utilized to study pure silica zeolites, but their accuracy and transferability require careful validation.
• The predictive capability of force fields is crucial for understanding and designing zeosil-based separation processes for hydrocarbons.
• This work provides guidance for selecting appropriate force fields for simulating small-pore zeosils in industrial separation applications.