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

Kibar M. E., Akın A. N.

INTERNATIONAL JOURNAL OF CHEMICAL KINETICS, vol.49, pp.119-129, 2017 (SCI-Expanded) identifier identifier


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 degrees C. Decomposition of the products starts beyond 400 degrees C and completes at 600 degrees 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 x 106 cm(2)/min and 18.2 kJ/mol and 6.5 x 10(-5) cm(2)/min, respectively. (C) 2016 Wiley Periodicals, Inc.