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Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst
Litong Liang1, Juntian Huai2, Qian Zhang1
1Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China.
Scientific Reports
|November 2, 2017
Summary
This study introduces a new catalytic depolymerization process for lignite, significantly boosting tar yield. The optimized process enhances tar production compared to traditional methods, offering a more efficient way to utilize lignite resources.
Area of Science:
- Chemical Engineering
- Materials Science
Background:
- Traditional lignite pyrolysis often yields low tar.
- Catalytic processes can alter product distribution.
Purpose of the Study:
- To develop a novel catalytic depolymerization process for lignite to enhance tar yield.
- To investigate the effect of cobalt chloride (CoCl2) and zinc chloride (ZnCl2) catalysts on lignite depolymerization.
Main Methods:
- Catalytic depolymerization of lignite using CoCl2 and ZnCl2 catalysts at varying concentrations.
- Analysis of tar yield using a Gray-King apparatus.
- Characterization of tar composition using Gas Chromatography-Gas Chromatography-Mass Spectrometry (GC×GC-MS).
- Analysis of char structure using Raman spectroscopy and elemental analysis.
- Analysis of gas products.
Main Results:
- Optimal concentrations of CoCl2 and ZnCl2 significantly increased tar yield by 20.3% and 6.6%, respectively, compared to raw coal.
- The catalytic depolymerization process produced more tar, unlike traditional catalytic pyrolysis.
- GC×GC-MS analysis revealed a dramatic increase in alkanes and two-ring aromatics in the tar.
- Raman spectroscopy indicated the formation of larger aromatic ring systems in the char.
- Methane content in gas products decreased significantly.
Conclusions:
- Catalytic depolymerization of lignite with CoCl2 and ZnCl2 is an effective method for enhancing tar yield.
- The catalysis promotes fragmentation and free radical formation, leading to increased tar production.
- The process modifies tar composition, favoring alkanes and smaller aromatics, and alters char structure.
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