Layered double hydroxide derived bifunctional Ca-Fe-Mg material for integrated CO2 capture and utilization via chemical looping strategy

As a powerful process intensification strategy, chemical looping shows a promising future to achieve an integrated CO 2 capture and utilization for reducing CO 2 emissions and energy-cost penalties. Herein, a bifunctional Ca-Fe-Mg material derived from layered double hydroxide (LDH) was synthesized and used in chemical looping reforming process for integrated CO 2 capture and utilization. Reactivity tests and detailed characterization techniques are performed to examine and explain the performance of this material. 900 °C is determined as a suitable reforming temperature, since more syngas production is obtained (2.5 times of at 800 °C). The presence of Ca induces a synergetic interaction between Ca and Fe to implement an enhanced performance of syngas contents and stable H 2 /CO ratio. The activity deactivation of the material derives from the phase transition of Ca 2 Fe 2 O 5 to MgFe 2 O 4 , crystal size variation and particle agglomeration. Compared to a reference coprecipitated material, LDH derived Ca-Fe-Mg material shows an enhanced syngas production, due to its highly dispersion of CO 2 sorption and reforming active sites. This work provides a new route to rationally design bifunctional material for integrated CO 2 capture and utilization.