Calcium looping of CO2 capture coupled to syngas production using Ni-CaO-based dual functional material

• High CO2 uptake and syngas yield, with sufficiently high cyclic stability. • Moderate temperatures for carbonation (450 °C) and syngas production (680 °C). • A quantitative, temperature-programmed real-time analysis for reactions kinetics. Calcium looping (CaL), which involves carbonation of CaO by CO 2 and regeneration of CaO through the conversion of the captured CO 2 into useful products, shows promise for carbon capture and utilization. By integrating CaL with methane dry reforming (DRM), the captured CO 2 can be converted into syngas, a valuable chemical feedstock and fuel. Herein, a dual functional material (DFM) composed of CaO (CO 2 adsorbent), Ni (DRM catalyst) and CeO 2 (promoter for DRM) had been developed to drive the CaL-DRM tandem processes. The CaO-Ni-CeO 2 DFM possessed high performance of cyclic CaL-DRM: high CO 2 uptake efficiency (10.3 mmol CO2 /g CaO ), high H 2 and CO yields (754.4 mmol H2 /g Ni and 454.6 mmol CO /g Ni ), moderate required temperature for carbonation (450 °C) and subsequent methane dry reforming (680 °C), and sufficiently high stability. The carbonation of CaO was strongly influenced by the basicity of the material, and the conversion of CH 4 with the captured CO 2 was affected by the Ni dispersion in the material. Overall, our work demonstrates a prototype study of using a temperature-programmed reaction platform for a quantitative, real-time analysis on CaL-DRM kinetics. The mechanistic understanding of CaL-DRM by the CaO-Ni-CeO 2 DFM were elucidated, showing promise for the catalyst optimizations.