A Novel Process for CO2 Capture by Using Sodium Metaborate, Part II: Carbonation Reaction and Kinetic Studies

• Published in: International journal of chemical kinetics 2017-02, Vol.49 (2), p.119-129
• Main Authors: Kibar, Murat Efgan, Akin, Ayşe Nilgün
• Format: Article
• Language: English
• ISSN: 0538-8066; 1097-4601
• DOI: 10.1002/kin.21061

ABSTRACT 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 (NaBO2) and carbon dioxide (CO2). Both hydrated and dehydrated forms of NaBO2 have high sorption capacities of CO2 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 × 106 cm2/min and 18.2 kJ/mol and 6.5 × 10−5 cm2/min, respectively.