Reduction and oxidation kinetics of solid fuel chemical looping combustion over a core-shell structured nickel-based oxygen carrier: Application of a developed grain size distribution model. (15th August 2020)

• Record Type: Journal Article
• Authors: Sedghkerdar, Mohammad Hashem; Karami, Davood; Mahinpey, Nader
• Is Part Of: Fuel. Volume 274(2020)
• Publication Date: 2020-08-15
• Subjects: Oxygen carrier -- Core-shell -- Coal -- Oxidation -- Reduction -- Grain size distribution model; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.117838
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: A nickel-based oxygen carrier supported by zirconia-shelled alumina was fabricated. The fabricated oxygen carrier was characterized using XRD, and BET/BJH methods. The feasibility of the chemical looping combustion with coal was investigated. A grain size distribution model was developed to predict the kinetics of the CLC. Abstract: In this study, the feasibility for chemical looping combustion (CLC) with a solid fuel was investigated using a novel synthesized nickel-based oxygen carrier (OC) supported by zirconia-shelled γ- alumina (35% NiO/Al2 O3 @Zr) in a TGA. The nickel-based OC was impregnated over an alumina support which was coated by mesoporous zirconia shell via core-shell method. A grain size distribution model (GSDM) was developed based on the prediction of an initial grain size distribution considering "pore to sphere" factor to describe the kinetics of reduction and oxidation reactions in CLC process with solid fuel. The crystalline phase and physical properties of the synthesized OC was obtained using XRD, and BET/BJH methods. The predicted fractional conversion over time of 35% NiO/Al2 O3 @Zr in reduction and oxidation reactions obtained by the GSDM correlated closely with the experimental data.