In-situ catalytic upgrading of coal pyrolysis tar coupled with CO2 reforming of methane over Ni-based catalysts

Tar was upgraded by integrating in-situ catalytic cracking of coal pyrolysis tar with CO2 reforming of methane (CRM) over Ni-based catalysts to improve light tar yield. The results showed that Ni-based catalysts can catalyze coal tar cracking and CRM simultaneously, and some radicals, like H and CHx...

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Bibliographic Details
Published in:Fuel processing technology 2018-08, Vol.177, p.119-128
Main Authors: Wang, Mingyi, Jin, Lijun, Li, Yang, Lv, Jiannan, Wei, Baoyong, Hu, Haoquan
Format: Article
Language:English
Subjects:
Aliphatic compounds
Aluminum oxide
Boiling points
Carbon dioxide
Catalysts
Catalytic cracking
Catalytic upgrading
CO2 reforming of methane
Coal pyrolysis tar
Coal tar
Methane
Molecular chains
Ni-based catalysts
Phenols
Pyrolysis
Radicals
Reforming
Upgrading
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Summary:Tar was upgraded by integrating in-situ catalytic cracking of coal pyrolysis tar with CO2 reforming of methane (CRM) over Ni-based catalysts to improve light tar yield. The results showed that Ni-based catalysts can catalyze coal tar cracking and CRM simultaneously, and some radicals, like H and CHx, produced in CRM over Ni-based catalysts could combine with the radicals from catalytic cracking of tar to avoid excessive cracking of tar. The catalyst 5Ni/Al2O3 (Ni/Al2O3 with 5 wt% Ni) showed the best performance for tar upgrading owing to its appropriate activity of both tar cracking and CRM. Compared with non-upgrading tar, the average molecular weight of upgrading tar over 5Ni/Al2O3 decreases from 279 to 193 amu, and the content and yield of light tar (boiling point 
ISSN:0378-3820
1873-7188
DOI:10.1016/j.fuproc.2018.04.022