(2lt) Synthetic Ru/K2CO3–MgO Dual Function Materials for Integrated CO2 Capture and Conversion Via Methanation at Low Temperatures

Integrated CO2 capture with methanation reaction to produce CH4 represents a promising technology to realize utilization. Designing Ru/K2CO3-MgO (Ru/KMg) dual function materials (DFMs) is the key to achieve integrated CO2 capture and methanation (ICCM) at low temperature. In this work, Ru/KMg DFMs are prepared by the wet impregnation method using a desired amount of Ru(O2C5H7)3, K2CO3, and MgO. The Ru on Ru/KMg was mainly present in the K2RuO3 phase, but was not observed after reduction at 400 ◦C. Furthermore, the crystallite size of Ru0 is smaller than that of Ru/MgO, because Ru species, a phase of K2RuO3, is well dispersed on the MgO support material. Herein, the CO2 capture and regeneration properties of Ru/KMg DFMs after carbonation at different temperatures (60, 120, 150, and 320 ◦C) were studied under N2 or H2 conditions, respectively. Considering 100% CO2 conversion to CH4, the optimal carbonation temperature was 150 ◦C. It is found that Ru/KMg DFMs displayed approximately CH4 productivities of 1.07–1.19 mmol CH4/g with 100% CH4 selectivity and 96.2%–101.3% CH4 yield, and working stability over 20 cycle.