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Reaction-Induced Reversible Reconstruction Enhanced Ni-MgO/CaO Dual Functional Material for Stable CO2 Capture and In

Hao Xu1,2, Chen Hou3, Jiawei Zhong4

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Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|April 27, 2026
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Summary

A novel dual-functional material efficiently captures carbon dioxide (CO2) and converts it into syngas via calcium looping dry reforming of methane. This breakthrough enhances CO2 fixation and catalytic conversion stability.

Keywords:
calcium loopingintegrated CO2 capture and utilizationmetal‐support interactionmethane dry reformingsolid solution

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Calcium looping dry reforming of methane (CaLDRM) is a key technology for CO2 fixation and syngas production.
  • Developing efficient and durable dual-functional materials (DFMs) with high CO2 capture and catalytic activity is crucial for CaLDRM.

Purpose of the Study:

  • To design and synthesize a novel Ni-MgO/CaO dual-functional material (DFM) for enhanced CaLDRM.
  • To investigate the material's performance in CO2 capture and methane conversion.
  • To understand the mechanism behind the material's stability and activity.

Main Methods:

  • Engineered a Ni-MgO solid solution (MgxNi1-xO) on a hierarchically porous CaO support with dispersed MgO.
  • Evaluated the DFM's CO2 uptake, conversion efficiency, and syngas yield at 620°C.
  • Conducted mechanistic studies to analyze material stability and catalytic activity over 65 cycles.

Main Results:

  • The Ni-MgO/CaO DFM achieved a CO2 uptake of 11.5 mmol g⁻¹, 90% CO2 conversion, and 55 mmol g⁻¹ syngas yield.
  • The material demonstrated high stability with insignificant deactivation over 65 cycles.
  • Mechanistic studies revealed reaction-induced reversible reconstruction, enhancing structural stability and catalytic site accessibility.

Conclusions:

  • The engineered MgxNi1-xO phase on CaO support effectively inhibits Ni agglomeration and CaO sintering.
  • The DFM decouples the activity-stability trade-off in CaLDRM, outperforming previous CaO-Ni based materials.
  • This work presents a practical strategy for designing advanced materials for CO2 capture and conversion.