(569au) Integrated CO2 Capture and Reverse Water Gas Shift Using NH3 As a H2 Carrier

Recently, integrated CO₂ capture and utilization (ICCU) have attracted attention in addressing energy- and cost-related issues in the conventional CO₂ capture and utilization (CCU) by effectively combining CO₂ capture and utilization using dual functional materials (DFMs). Among CO₂ utilization processes, reverse water-gas shift (rWGS) is one efficient way converting CO₂ with H₂ to CO. In the integrated CO₂ capture and rWGS (ICCrWGS), CO₂ is captured from the flue gas using sorbent materials, and then the spent material is regenerated and the desorb CO₂ reacts with H₂ that is produced via decomposition of NH₃. In this study, a new concept of ICCrWGS using NH₃ (NH₃-ICCrWGS) as a H₂ carrier over Ni/CaO-based DFMs. During carbonation step, CO₂ is captured by CaO as a formation of CaCO₃ in the Ni/CaO based DFMs. In the subsequent rWGS step, NH₃ decomposition, NiO reduction, CaCO₃ regeneration and rWGS occur simultaneously. CO₂ capture and the rWGS performances over the Ni/CaO-based DFMs were evaluated at the different temperatures. Mechanistic studies of CO₂ capture and rWGS were determined during NH₃-ICCrWGS process.