(544hn) Combined Capture and Utilization of CO2 for Syngas Production over Dual-Function Materials

The integration of CO₂ capture and conversion has been recently demonstrated as a promising approach to address CO₂ emissions while producing value-added chemicals and fuels. Herein, we report in-situ capture and utilization of CO₂ in syngas production from dry reforming of ethane (DRE) over dual-function materials (DFMs) consisting of Ni-impregnated CaO and MgO-based double salts supported on γ-Al₂O₃. The N₂ physisorption, XRD, CO₂-TPD, NH₃-TPD, H₂-TPR, and XPS analyses were performed to characterize the obtained DFMs. The CO₂ adsorption-desorption performance of γ-Al₂O₃-supported adsorbent-catalyst materials at 650 °C indicated that 100% of the adsorbed CO₂ was desorbed from the DFMs surface for subsequent reaction with C₂H₆. At reaction temperature of 650 °C and WHSV of 2250 mL/g.h, the Ni₂₀@(K-Ca)₅₀/(γ-Al₂O₃)₅₀ and Ni₂₀@(Na-Ca)₅₀/(γ-Al₂O₃)₅₀ showed the best activity with 100% C₂H₆ conversion and 65 and 75% CO₂ conversion, respectively. Analysis of the spent DFMs revealed low degree of coke formation (~9 wt%) which reduced the stability of DFMs by only 5%. The results reported in this investigation highlight the importance of combined capture-reaction system as a cost-effective technology for utilizing the emitted CO₂ as a feedstock to make valuable chemicals, materials and fuels.