Combined Capture and Utilization of CO2 for Syngas Production over Dual-Function Materials

The integration of CO 2 capture and conversion has been recently demonstrated as a promising approach to address CO 2 emissions while producing value-added chemicals and fuels. Herein, we report in situ capture and utilization of CO 2 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-Al 2 O 3 . The N 2 physisorption, XRD, CO 2 -TPD, NH 3 -TPD, H 2 -TPR, and XPS analyses were performed to characterize the obtained DFMs. The CO 2 adsorption–desorption performance of γ-Al 2 O 3 -supported adsorbent-catalyst materials at 650 °C indicated that 100% of the adsorbed CO 2 was desorbed from the DFMs surface for subsequent reaction with C 2 H 6 . At a reaction temperature of 650 °C and WHSV of 2250 mL g –1 h –1, the Ni 20 @(K–Ca) 50 /(γ-Al 2 O 3 ) 50 and Ni 20 @(Na–Ca) 50 /(γ-Al 2 O 3 ) 50 showed the best activity with 100% C 2 H 6 conversion and 65% and 75% CO 2 conversion, respectively. Analysis of the spent DFMs revealed a 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 CO 2 as a feedstock to make valuable chemicals, materials, and fuels.