NDLI: Oxidation and reduction characteristics of oxygen carrier particles and reaction kinetics by unreacted core model

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Oxidation and reduction characteristics of oxygen carrier particles and reaction kinetics by unreacted core model

Content Provider	Semantic Scholar
Author	Han, Keun-Hee Lee, Seung-Yong Jin, Gyoung-Tae Choi, Jeong-Hoo
Copyright Year	2001
Abstract	The reaction kinetics of the oxygen carrier particles, which are used as bed material for a fluidized bed chemical looping combustor (CLC), has been studied experimentally by a conventional thermal gravimetrical analysis technique. The weight percent of nickel and nickel oxide in oxygen carrier particles and reaction temperature were considered as experimental variables. After oxidation reaction, the pure nickel particle was sintered and unsuitable to use as fluidizing particles. The oxidation reaction rate increased with increasing weight percent of nickel in oxygen carrier particles and reaction temperature. The rate of reduction shows maximum point with weight percent of nickel oxide (57.8%) and reaction temperature (750 or 800 °C) increased. In this work, the reaction between air and Ni/ bentonite particle was described by a special case of unreacted core model in which the global reaction rate is controlled by product layer diffusion resistance. However, the reaction between CH4 and NiO/bentonite particle was described by unreacted core model in which the global reaction rate is controlled by chemical reaction resistance. The temperature dependence of the effective diffusivity of oxidation reaction and reaction rate constant of reduction reaction could be calculated from experimental data and fitted to the Arrhenius equation.
Starting Page	831
Ending Page	837
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1007/BF02705604
Volume Number	18
Alternate Webpage(s)	https://www.cheric.org/PDF/KJChE/KC18/KC18-6-0831.pdf
Alternate Webpage(s)	https://doi.org/10.1007/BF02705604
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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