Reaction Performance of CaSO₄/Ben Oxygen Carrier Modified by Fe₂O₃ in Chemical Looping Combustion

Multiple cycles of experiments and reaction performance tests respectively were conducted using a batch fluidized bed reactor and a thermogravimetric analyzer. The catalytic effect of Fe₂O₃ on CaSO₄/Ben oxygen carriers (OCs) during chemical looping combustion (CLC) was analyzed and the reaction activation energy of CaSO₄/Ben OCs with different Fe₂O₃ contents and CO were compared. The experimental results showed that the specific surface area and pore volume of CaSO₄/Ben OCs increased with the addition of Fe₂O₃, which improved the reduction reaction rate and maintained the high CO₂ concentration in the system. Fe₂O₃ could inhibit CaSO₄ reaction to generate CaO and sulfur-containing gases, and improve the stability of CaSO₄/Ben OCs circulation reaction. w=15.0% Fe₂O₃ addition was the best choice. The addition of w=15.0% Fe₂O₃ reduced the activation energy of CaSO₄/Ben OCs reacting with CO from 88.72 kJ/mol to 43.08 kJ/mol, and the reactivity of CaSO₄/Ben OCs was significantly improved.