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Pyrolusite reduction processes by three major biomass components cellulose,hemicelluloses and lignin,represented by CP,HP and LP,respectively,were investigated by thermogravimetric analyzer coupled with Fourier transform infrared spectrometry(TG-FTIR).The Sestak-Berggren(SB) equation was used to evaluate the kinetics of reduction processes.TG analysis reveals that the main reduction processes occur at 250-410 ℃,220-390 ℃,and 190-410 ℃ for CP,HP,and LP,respectively.FT-IR and XRD results indicate that various reducing volatiles(e.g.aldehydes,furans,ketones and alcohols) are produced from the pyrolysis with the three major components,which directly reduce MnO_2 in ore to MnO.The processes are described by the SB equation with three parameters(m,n,p).Their non-zero values suggest that pyrolusite reduction is controlled by the diffusion of reducing gaseous products through an ash/inert layer associated with minerals.The apparent activation energies for pyrolusite reduction by CP,HP and LP are 40.48,25.70 and 40.10 kJ·mol~(-1),respectively.
Pyrolusite reduction processes by three major biomass components cellulose, hemicelluloses and lignin, represented by CP, HP and LP, respectively, investigated by thermogravimetric analyzer coupled with Fourier transform infrared spectrometry (TG-FTIR). The Sestak- Berggren (SB) equation was used to evaluate the kinetics of reduction processes. TGA analysis reveals that the main reduction processes occur at 250-410 ° C., 220-390 ° C., and 190-410 ° C. for CP, HP, and LP, respectively. FT-IR and XRD results are various reducing volatiles (egaldehydes, furans, ketones and alcohols) are produced from the pyrolysis with the three major components, which directly reduce MnO_2 in ore to MnO.The processes are described by the SB equation with three parameters (m, n , p. Their non-zero values suggest that pyrolusite reduction is controlled by the diffusion of reducing gaseous products through an ash / inert layer associated with minerals.The apparent activation energies for pyrolusite reduction by CP, HP d LP are 40.48, 25.70 and 40.10 kJ · mol -1, respectively.