Refractory dopant-incorporated CaO from waste eggshell as sustainable sorbent for CO2 capture: Experimental and kinetic studies
作者： Maedeh Mohammadi , Pooya Lahijani , Abdul Rahman Mohamed
DOI: 10.1016/J.CEJ.2014.01.018
关键词: Sorbent 、 Diffusion 、 Calcination 、 Thermogravimetric analysis 、 Materials science 、 Activation energy 、 Chemical reaction 、 Waste management 、 Dopant 、 Chemical engineering 、 Carbonation
摘要: Abstract This work investigates the development of dopant-stabilized CaO-based sorbents for CO 2 capture and studies kinetics carbonation reaction. Eggshell as biogenesis calcium waste was calcined to obtain low cost CaO powder. Several refractory dopants (Ti, Al, Cu Zi) were then incorporated within matrix prepare robust sorbents. The performance developed assessed in some calcination–carbonation cycles performed Thermogravimetric analyzer (TGA). Among sorbents, Zr-doped exhibited superior durability, where a conversion around 88% could be sustained 20 cycles. To have an insight into rate controlling mechanism fundamental concept activation energy, kinetic study on reaction sorbent. Kinetic results based shrinking core model suggested that controlled by combination resistances arising from diffusion through carbonate layer its chemical at CaO–CaCO 3 interface. intrinsic diffusional energies obtained 39.4 46.5 kJ/mol, respectively.
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