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

Authors: 
Al-Mamoori, A., Missouri University of Science and Technology
Rownaghi, A., Missouri University of Science and Technology
Rezaei, F., Missouri University of Science and Technology
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.