SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2015, Vol. 23 ›› Issue (10): 1691-1697.DOI: 10.1016/j.cjche.2015.08.028

• ENERGY, RESOURCES AND ENVIRONMENTAL TECHNOLOGY • Previous Articles     Next Articles

TG-FTIR analysis of pyrolusite reduction bymajor biomass components

Yunfei Long1, Le Ruan2, Xiaoyan Lü1, Yiju Lü2, Jing Su1, YanxuanWen1   

  1. 1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;
    2 College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
  • Received:2014-06-26 Revised:2015-01-16 Online:2015-11-27 Published:2015-10-28
  • Supported by:

    Supported by the National Natural Science Foundation of China (21166003) and the Doctoral Foundation of Ministry of Education of China (20114501110004).

TG-FTIR analysis of pyrolusite reduction bymajor biomass components

Yunfei Long1, Le Ruan2, Xiaoyan Lü1, Yiju Lü2, Jing Su1, YanxuanWen1   

  1. 1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;
    2 College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China
  • 通讯作者: YanxuanWen
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21166003) and the Doctoral Foundation of Ministry of Education of China (20114501110004).

Abstract: 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 transforminfrared spectrometry (TG-FTIR). The Šesták-Berggren (SB) equationwas 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 pyrolysiswith the three major components, which directly reduce MnO2 in ore to MnO. The processes are described by the SB equationwith 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.

Key words: Pyrolusite, Reduction, Biomass, Component, TG-FTIR

摘要: 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 transforminfrared spectrometry (TG-FTIR). The Šesták-Berggren (SB) equationwas 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 pyrolysiswith the three major components, which directly reduce MnO2 in ore to MnO. The processes are described by the SB equationwith 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.

关键词: Pyrolusite, Reduction, Biomass, Component, TG-FTIR