• A two-equation turbulent (TET) model is introduced to describe turbulent mass diffusion in turbulent fluidized beds, providing rigorous closure for mass transfer equations.
• The simulation using the TET model, EMMS drag, and KTGF accurately predicts ozone concentration with an average absolute relative deviation of 9.67%.
• The transition velocity from bubbling to turbulent fluidization for FCC particles is determined to be about 0.5 m·s−1, matching experimental observations.
• The proposed computational mass transfer approach offers a reliable tool for designing and optimizing turbulent fluidized bed reactors.