Sulfur tolerance of Na-Ru/Al2O3 dual function material during the cyclic CO2 capture and catalytic methanation

Converting CO2 captured from flue/process gases or even from air using green hydrogen made from renewable energy is a way to contribute to reaching the ambitious decarbonization goals set for 2050 and also a valuable solution to store excess electrical energy in fuels/chemicals solving the intrinsic variability of renewable sources. The integrated CO2 capture and methanation with Dual Function Materials (DFM) is emerging as a vibrant field of research for its potential to increase the efficiency and reduce the cost of current multistage CCU processes. However, testing the S-tolerance and durability of DFMs during prolonged cyclic operation with feeds containing sulfur impurities is an area requiring detailed investigation before the integrated process is to be scaled up to applications . In this work, we set out to investigate for the first time the effect of sulfur poisoning during the cyclic CO2 capture and methanation performed over a Sodium-Ruthenium on ?-Al2O3 DFM, which is reported among the best performing formulations at mid-low temperatures