Synergistic Ni-Ce Dual sites in hierarchical HZSM-5: Breaking the energy-efficiency bottleneck in CO2-rich amine regeneration

Abstract

In the CO₂ desorption process, solid acid catalysts with high surface area and abundant acid sites have emerged as promising candidates for enhancing CO₂-rich amine regeneration efficiency. Herein, we designed a hierarchical HZSM-5 catalyst modified with a bimetallic combination of Ni and Ce using a one-step synthesis method to accelerate CO₂ desorption rate. The optimized catalyst exhibited a high mesoporous specific surface, abundant acid sites, and excellent stability, leading to a remarkable 55.8% increase in the CO₂ desorbed amount. Cyclic tests demonstrated sustained catalytic performance, with no significant decline in CO₂ desorption performance over multiple cycles. Furthermore, the HZ-NiCe (3:2) catalyst exhibited broad applicability across various typical blended amine systems. This work provides a novel synthesis strategy for promoting the catalytic efficiency for economical CO₂ desorption and further decreasing the cost of CO₂ capture.