A Novel Process for CO 2 Capture by Using Sodium Metaborate, Part II: Carbonation Reaction and Kinetic Studies

In Part II of this two‐part series of papers, optimization of carbonation reaction with sodium metaborate and kinetics of the reaction are studied and compared to the structural properties, which were reported in Part I. This paper presents a comprehensive study on the optimization of reaction conditions and determination of reaction parameters of sodium metaborate (NaBO 2 ) and carbon dioxide (CO 2 ). Both hydrated and dehydrated forms of NaBO 2 have high sorption capacities of CO 2 up to 400°C. Decomposition of the products starts beyond 400°C and completes at 600°C. The shrinking core model is used to explain the kinetics of the noncatalytic heterogeneous reaction. The reaction progresses in two stages: one is surface reaction controlled and the other is diffusion controlled. The apparent activation energy and preexponential factor for reaction‐controlled and diffusion‐controlled regions are calculated as 11.8 kJ/mol and 3.5 × 10 6 cm 2 /min and 18.2 kJ/mol and 6.5 × 10 −5 cm 2 /min, respectively.