Pore Engineering of Porous Framework Materials for Efficient SF6 Capture

Abstract

Sulfur hexafluoride (SF6) is an artificial inert gas widely used in the power and semiconductor industries and is known as a significant contributor to the greenhouse effect due to its high global warming potential. Porous framework materials (PFMs), including metal-organic frameworks (MOFs), covalent organic frameworks (COFs) and porous aromatic frameworks (PAFs), are well-established SF6 adsorbents characterized by highly ordered pore structures that can efficiently adsorb SF6 via various electrostatic interactions. Recent advancements have focused on optimizing electrostatic interactions with SF6 molecules to enhance their SF6 adsorption performance in industrial settings. However, a comprehensive review on precise control of the structural and chemical properties through pore engineering strategies for PFMs has not been reported yet. This review systematically outlined the structure-activity relationship and the dominant mechanisms of host-guest interaction modes for effective SF6 capture, discussed pore engineering strategies to achieve efficient SF6 capture. Specifically, adjusting pore structure to align with SF6 molecules, modifying pore surface to strengthen electrostatic interactions and designing hierarchical pore structures to enhance SF6 adsorption kinetics are involved. Lastly, potential of PFMs for SF6 capture is discussed from perspectives of AI-driven creation of high-performance PFMs, enhanced water- and acid-resistance PFMs under specialized condition and shaping methods, aiming to guide the development of advanced SF6 adsorbents based on PFMs.