Pyrolysis characteristics of Shendong coal by CH3OH-THF swelling coupled with in-situ loading of metal ions. (1st October 2019)

• Record Type: Journal Article
• Authors: Sun, Ming; Wang, Qiang; He, Chao; Gao, Junwen; Wang, Rucheng; Zhang, Yujuan; Xu, Long; Yao, Qiuxiang; Ma, Xiaoxun
• Is Part Of: Fuel. Volume 253(2019)
• Page Start: 409
• Page End: 419
• Publication Date: 2019-10-01
• Subjects: Shendong coal -- Swelling -- Catalytic pyrolysis -- TG-FTIR -- Py-GC/MS -- Coal tar; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2019.04.154
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: Coal was pretreated by CH3 OH-THF swelling in-situ loading of metal ions. The structures of coal samples were characterized by CP/MAS 13 C NMR and FTIR. The pyrolysis characteristics of coal were analyzed by TG-FTIR, Py-GC/MS, etc. The swelling with loading of Cu 2+ and Co 2+ promotes the generation of benzene. The activation energy of coal pyrolysis can be reduced by loading of metal ions. Abstract: The effects of demineralization, CH3 OH-THF mixed solvent swelling, CH3 OH-THF swelling coupled with in-situ loading of metal ions (Ca 2+, Mn 2+, Cu 2+ and Co 2+ ) on pyrolysis reactivity and kinetic characteristics of Shendong low rank coal were investigated. The structure of coal samples was characterized by solid-state cross-polarization magic angle spinning carbon-13 nuclear magnetic resonance (CP/MAS 13 C NMR) and Fourier transform infrared spectrometer (FTIR). The pyrolysis characteristics and distribution of pyrolysis products of coal were analyzed by thermogravimetric analyzer/Fourier transform infrared spectrometer (TG-FTIR), pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and the fixed bed reactor. The results show that solvent swelling coupled with in-situ loading of Ca 2+, Mn 2+, Cu 2+ and Co 2+ promotes coal pyrolysis, and their net weight losses increase by 2.14 wt%, 0.07 wt%, 6.31 wt% and 6.18 wt%, respectively. Py-GC/MS analysis shows that the treatment of solvent swelling coupled with in-situ loading of metal ions Ca 2+, Mn 2+, Cu 2+, Co 2+ can increase the content of aromatic hydrocarbons and decrease the content of acidic compounds in coal tar. The content of benzene increases under the action of solvent swelling coupled with in-situ loading of Cu 2+ and Co 2+ by 42.73 wt% and 40.98 wt%, respectively. The kinetic calculation shows that the activation energies of the first and second stages of coal pyrolysis are reduced and the reactivity of coal can be improved by swelling coupled with in-situ loading of metal ions.