(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 Î³-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 Î³-Al2O3-supported adsorbent-catalyst materials at 650 Â°C indicated that 100% of the adsorbed CO2 was desorbed from the DFMs surface for subsequent reaction with C2H6. At reaction temperature of 650 Â°C and WHSV of 2250 mL/g.h, the Ni20@(K-Ca)50/(Î³-Al2O3)50 and Ni20@(Na-Ca)50/(Î³-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.