In Situ Growth of Metal-Organic Frameworks (MOFs) in Rocks for CO2 Capture and Storage

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Provides a concrete method to enhance CO2 storage capacity in porous media via MOF modification, opening new directions for reservoir engineering research.

🏢実務担当者:Offers a potential technique to improve CO2 injection efficiency and reduce leakage risk in geological storage projects, though still at lab scale.

🏛政策担当者:Highlights the promise of advanced materials in CCUS, supporting the case for R&D investment in storage-enhancement technologies.

The continued rise in atmospheric CO2 concentration has intensified the need for efficient carbon capture, utilization, and storage (CCUS). Although CO2 injection into deep oil and gas reservoirs has been widely implemented for geological storage and enhanced oil recovery (EOR), the limited physicochemical adsorption capacity of natural reservoir rocks can lead to CO2 migration and leakage risks during long-term injection. Metal-organic frameworks (MOFs), featuring designable pore architectures and excellent gas- adsorption performance, are considered among the most promising materials for CO2 capture and storage. Herein, we propose the in situ growth of MOF nanocrystals (zeolitic imidazolate framework-8, ZIF-8) within natural rock (Berea sandstone, BS) to construct ZIF-8/BS composite porous media with macroscopically stable loading and a microscopically intimate interface. Structural characterization and gas-adsorption results show that the incorporation of ZIF-8 imparts a hierarchical pore structure and increases the specific surface area from 1.8197 to 25.4238 m2 g−1. At 298 K and 100 kPa, the CO2 uptake of ZIF-8/BS reaches 22.21 cm3 g−1 STP, which is significantly higher than that of BS (0.15 cm3 g−1 STP), and remains stable after repeated adsorption-desorption cycles. Furthermore, combined with online low-field nuclear magnetic resonance (NMR) supercritical CO2-H2O two-phase displacement experiments, ZIF-8/BS exhibits superior water removal and higher displacement efficiency than BS. After displacement, the residual water saturation (Sw) decreases from 43.18% to 32.34%, and the displacement efficiency (η) increases from 56.82% to 67.66%. Overall, the coupling between MOF-derived micropore adsorption and rock pore scale seepage processes enhances CO2 retention in porous media and improves two-phase displacement performance, providing new insights into strategies for regulating reservoir pore interfaces via material modification in CO2 geological storage and CO2-EOR.

• semanticscholar https://doi.org/10.30632/spwla-2026-0008first seen 2026-07-31 06:46:47