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• W4308157447 endingPage "126474" @default.
• W4308157447 startingPage "126474" @default.
• W4308157447 abstract "Dynamic solar pyrolysis experiments of willow pellets with different thicknesses (3 mm, 1 mm and 0.5 mm) were conducted at heat flux densities of 0.5 and 1.1 MW/m2 to study the physicochemical structure evolution of char. Characterizations of the physical structure showed that the reflectivity of char surface firstly reached the minimum value of 7.3 % and then rebounded to 15.3 %. The specific surface area decreased with reaction time from 13.2 to 2.0 m2/g, indicating its poor microscale pore structure (pore size ≤500 nm). The 3D scanning conducted by computed tomography (micro-CT system) showed that the residue pellet has unique hierarchical layers with different density and porosity. The lamellar structure can be also found inside the char layer which may be due to the increasing temperature gradient and the internal pressure caused by the volatile release. Concerning the chemical structure evolution, the secondary coking of the heavy compounds in volatiles introduced more oxygen-containing groups and alkyl side chains into the char layer. The aromatic rings system in the inner part of char was developed through removal of side-chains and functional groups. Further structure ordering of char surface was contributed by dehydrogenation and condensation. These differences between two parts of char can be attributed to the poor heat and mass transfer properties of lamellar structure. This work reveals the unique structural characteristics of solar pyrolysis char, which complements the solar pyrolysis mechanism and provides a new insight into the structural evolutions." @default.
• W4308157447 created "2022-11-08" @default.
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• W4308157447 date "2023-02-01" @default.
• W4308157447 modified "2023-09-30" @default.
• W4308157447 title "Solar pyrolysis of biomass - part II: The physicochemical structure evolution of char" @default.
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• W4308157447 doi "https://doi.org/10.1016/j.fuel.2022.126474" @default.
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