System and method for CO2 hydrogenation using multi-enzyme immobilization on modified metal-organic framework (MOF)

Abstract

There is disclosed a highly stable biocatalytic multi-enzyme system on hydrophobic support for the efficient and continuous hydrogenation of carbon dioxide (CO2) to formate. The system immobilizes formate dehydrogenase (FDH), glucose dehydrogenase (GDH), and carbonic anhydrase (CA) enzymes on a hydrophobic surface-modified metal-organic framework (MOF), SA-HKUST-1. The hydrophobic surface modification with stearic acid enhances the enzyme stability and reusability, maintaining 95% activity after four cycles. The hydrophobicity of SA-HKUST-1 improves CO2 diffusion to the immobilized enzymes, significantly boosting the formate production. Enzyme specificity ensures selective reactions, with FDH facilitating CO2 bioconversion, CA accelerating CO2 hydration and GDH facilitating cofactor regeneration within the system. The system demonstrates superior performance, producing 255.8 mM formate per gram of MOF per hour. Operating under mild conditions with simple equipment, it reduces costs and eliminates harmful by-products. This invention offers an eco-friendly, sustainable approach for CO2 mitigation, with potential applications in industrial CO2 conversion processes.

Dependencies are inferred from the claim text.