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- W180363911 abstract "Pyrolysis of biomass involves heterogeneous substrates and complex reactions. The substrate may contain various amounts of cellulose, hemicelluloses, lignin, extractives and inorganics with different thermal properties. The reactions involve alternative pathways and consecutive series, which are affected by pyrolytic conditions including the time and temperature profile, ambient atmosphere and catalysis by inorganic materials. Consequently, composition, yield and rate of formation of the products are highly dependent on the employed substrate and pyrolytic condition. Pyrolysis at temperatures below 300/sup 0/C involves depolymerization, dehydration, rearrangement and formation of carboxyl and carbonyl groups, evolution of CO and CO/sub 2/, development of free radicals and condensation to char. At temperatures above 300/sup 0/C, these reactions are accompanied by the conversion of the glycosyl units to levoglucosan by transglycosylation. This reaction is preceded by the activation of the molecule, presumably through glass transition, which gives the required conformational flexibility. At still higher temperatures (above 500/sup 0/C), the glycosyl structure of the levoglucosan or cellulose rapidly breaks down to provide a variety of low molecular weight fission products, including hydrocarbons and hydrogen as well as CO, CO/sub 2/ and H/sub 2/O obtained at lower temperatures. The pyrolysis products could further react to alter the composition ofmore » the pyrolysate.« less" @default.
- W180363911 created "2016-06-24" @default.
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- W180363911 date "1983-01-01" @default.
- W180363911 modified "2023-09-24" @default.
- W180363911 title "Alternative pathways for pyrolysis of cellulose" @default.
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