Grant fuels Shi's research on energy-efficient natural gas processing

By Peter Murphy

Shi’s research specializes in using machine learning (ML), molecular simulation and statistical mechanical theory to understand, discover and design nanoporous material for energy and sustainability applications.

The ACS PRF grant will provide Shi with $110,000 in funding to use high-throughput molecular simulations and ML for methane diffusion in microporous polymers, a crucial material for energy efficient processes.

Nanoporous materials are substances with small holes or nanoscale pores. They mimic some of the porosity found naturally, like in shale rocks, wood and human bones. The surface area of nanoporous materials can be large, despite the nanoscale level of the small pores, according to Shi.

“The surface area for one gram of metal-organic framework—a type of nanoporous material—can be as high as 8,000 m², which is commensurate to half the area of UB’s football stadium,” Shi says.

Nanoporous materials have helped address critical societal challenges as a key component in energy storage, carbon capture, nanomanufacturing, drug delivery, tissue regeneration, and chemical separation. Shi and his research group aim to develop advanced computational methods to discover and design nanoporous materials for similar applications.

“Microporous polymers are promising membrane materials to meet the industrial demands for large-scale, energy-efficient natural gas processing,” Shi says. “The intricate pore networks in the polymers are crucial for chemical separation, but the impact of these networks on methane diffusion is not fully understood.”

Shi and his research group aim to close this gap. Using microporous polymers for methane diffusion has potential as an energy efficient way to process natural gas, but the materials’ intricate channels of pores make the movement of methane difficult to predict. Shi and others are developing a novel graph-based computational method to characterize nanoporous materials and predict their properties regarding industrial applications like methane diffusion. Their findings have potential to advance the understanding of molecular diffusions in natural geological materials, which could enhance oil and gas recovery and geologic carbon dioxide capture.

“This project will lead to a new graph-based package tailor-made for porous materials,” Shi says. “We expect this package will be adopted by the community to enhance the visualization, characterization, and understanding of nanoporous materials.”

Many ML models are black boxes—they can produce results, but often do not explain how they developed the results. Shi and team are developing their ML architecture to provide not just results, but a comprehensive understanding of how it achieved those results.

“Predicting molecular diffusion in nanoporous materials is a challenging task, usually involving lengthy molecular dynamics simulations that are time consuming,” Shi says. “We will develop our ML model to predict molecular transport behavior in nanoporous materials rapidly and accurately. It will also help identify porous structures that favor molecular diffusion.”

He continued, “We expect our ML work will help pave the way for using ML for scientific discovery.”