High-Purity Hydrogen Obtained via a Plasma-Assisted Chemical Looping Process Using Perovskite-Supported Iron Oxides as Oxygen Carriers
Chen Wang, Tong Liu, Rui Xiao, Dewang Zeng
Abstract
Plasma-assisted chemical looping hydrogen generation has received attention for its capability of generating hydrogen at mild temperatures. However, severe carbon deposition is a challenge, since plasma is capable of dissociating carbonaceous fuels directly. Here, we synthesized several perovskite-supported Fe 2 O 3 as oxygen carriers and investigated their hydrogen generation performance in plasma. The results show that Fe 2 O 3 /LaSrFeO 3 reduces carbon deposition by 77.73% compared with pure Fe 2 O 3, producing a hydrogen purity as high as 99.42% at 400 °C. The characterization analysis indicates that the addition of LaSrFeO 3 increases the oxygen vacancy concentration, facilitating the migration of lattice oxygen from the bulk phase to the surface. In addition, plasma facilitates the evolution of the surface lattice oxygen to highly reactive oxygen species. The high concentration of highly active oxygen species can enhance the carbon elimination reaction. Hence, high-purity hydrogen can be obtained. This study helps to improve our understanding of mitigating carbon deposition and increasing hydrogen purity via plasma-assisted chemical looping hydrogen production.