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Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst

A novel process for improving tar yield through catalytic depolymerization of a typical lignite was put forward. The catalytic depolymerization of the lignite over CoCl(2) and ZnCl(2) catalyst in different concentrations were investigated by a Gray-King apparatus. The optimal catalyst concentrations...

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Autores principales: Liang, Litong, Huai, Juntian, Zhang, Qian, Liu, Jianwei, Huang, Wei, Zhang, Zhonglin, Hao, Xiaogang, Guan, Guoqing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5663918/
https://www.ncbi.nlm.nih.gov/pubmed/29089610
http://dx.doi.org/10.1038/s41598-017-14869-w
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author Liang, Litong
Huai, Juntian
Zhang, Qian
Liu, Jianwei
Huang, Wei
Zhang, Zhonglin
Hao, Xiaogang
Guan, Guoqing
author_facet Liang, Litong
Huai, Juntian
Zhang, Qian
Liu, Jianwei
Huang, Wei
Zhang, Zhonglin
Hao, Xiaogang
Guan, Guoqing
author_sort Liang, Litong
collection PubMed
description A novel process for improving tar yield through catalytic depolymerization of a typical lignite was put forward. The catalytic depolymerization of the lignite over CoCl(2) and ZnCl(2) catalyst in different concentrations were investigated by a Gray-King apparatus. The optimal catalyst concentrations of CoCl(2) and ZnCl(2) catalyst that could obtain the highest tar yield was achieved, by which the tar yield increased about 20.3% and 6.6% compared with that of the raw coal, respectively. Different with the traditional catalytic pyrolysis process for which the tar yield decreased, more tar was produced by the catalytic depolymerization method. The GC × GC-MS analysis showed that the components of alkanes and two-ring aromatics in tar increased dramatically with the addition of the optimal CoCl(2) and ZnCl(2) catalyst. The Raman measurement revealed that more large aromatic ring systems ( > 6 rings) were formed in the char from depolymerization with catalyst and the elemental analysis showed that the hydrogen content decreased slightly. The gas products analysis reflected the contents of methane showed an obvious decrease. All of this reflects that more fragments and small free radicals cracked were enhanced by catalysis in the catalytic depolymerization process, thereby leading to an enhancement of the tar formation possibilities.
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spelling pubmed-56639182017-11-08 Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst Liang, Litong Huai, Juntian Zhang, Qian Liu, Jianwei Huang, Wei Zhang, Zhonglin Hao, Xiaogang Guan, Guoqing Sci Rep Article A novel process for improving tar yield through catalytic depolymerization of a typical lignite was put forward. The catalytic depolymerization of the lignite over CoCl(2) and ZnCl(2) catalyst in different concentrations were investigated by a Gray-King apparatus. The optimal catalyst concentrations of CoCl(2) and ZnCl(2) catalyst that could obtain the highest tar yield was achieved, by which the tar yield increased about 20.3% and 6.6% compared with that of the raw coal, respectively. Different with the traditional catalytic pyrolysis process for which the tar yield decreased, more tar was produced by the catalytic depolymerization method. The GC × GC-MS analysis showed that the components of alkanes and two-ring aromatics in tar increased dramatically with the addition of the optimal CoCl(2) and ZnCl(2) catalyst. The Raman measurement revealed that more large aromatic ring systems ( > 6 rings) were formed in the char from depolymerization with catalyst and the elemental analysis showed that the hydrogen content decreased slightly. The gas products analysis reflected the contents of methane showed an obvious decrease. All of this reflects that more fragments and small free radicals cracked were enhanced by catalysis in the catalytic depolymerization process, thereby leading to an enhancement of the tar formation possibilities. Nature Publishing Group UK 2017-10-31 /pmc/articles/PMC5663918/ /pubmed/29089610 http://dx.doi.org/10.1038/s41598-017-14869-w Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Liang, Litong
Huai, Juntian
Zhang, Qian
Liu, Jianwei
Huang, Wei
Zhang, Zhonglin
Hao, Xiaogang
Guan, Guoqing
Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst
title Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst
title_full Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst
title_fullStr Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst
title_full_unstemmed Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst
title_short Catalytic depolymerization of a typical lignite for improving tar yield by Co and Zn catalyst
title_sort catalytic depolymerization of a typical lignite for improving tar yield by co and zn catalyst
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5663918/
https://www.ncbi.nlm.nih.gov/pubmed/29089610
http://dx.doi.org/10.1038/s41598-017-14869-w
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