In-situ catalytic upgrading of coal pyrolysis tar on carbon-based catalyst in a fixed-bed reactor

Coal pyrolysis tar was in-site upgraded in a fixed-bed reactor over char and activated carbon (AC) catalysts, and the effects of catalysts and temperature on tar upgrading were examined. The content of light tar with boiling point below 360°C was improved over the catalysts despite the decrease of t...

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Published inFuel processing technology Vol. 147; pp. 41 - 46
Main Authors Jin, Lijun, Bai, Xiaoyu, Li, Yang, Dong, Chan, Hu, Haoquan, Li, Xian
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.06.2016
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Online AccessGet full text
ISSN0378-3820
1873-7188
DOI10.1016/j.fuproc.2015.12.028

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Abstract Coal pyrolysis tar was in-site upgraded in a fixed-bed reactor over char and activated carbon (AC) catalysts, and the effects of catalysts and temperature on tar upgrading were examined. The content of light tar with boiling point below 360°C was improved over the catalysts despite the decrease of total tar yield. Compared with char catalyst, AC exhibited better upgrading performances, and the content of light tar increased with the temperature. The light tar yield over AC catalyst increased by 18% compared with that without catalysts at 650°C. The variation in coal tar fractions suggested that upgrading is mainly from the conversion of the heavy components (pitch) in tar into light tar and gases. The role of carbon-based catalyst in upgrading process was also explored through the characterization by TG-DTG, FT-IR, N2 adsorption and Raman spectroscopy. Compared with thermal cracking, adsorption on the catalysts and the minerals in char, high specific surface areas and relative more defects in the carbon catalysts seem to be the primary factor for upgrading tar. •Coal pyrolysis tar was in-site upgraded over char and activated carbon catalysts.•Content and yield of light tar was greatly increased by activated carbon catalyst.•Activated carbon catalyst exhibits better upgrading tar than coal char.•Carbon catalysts with high surface area are preferable for upgrading coal tar.
AbstractList Coal pyrolysis tar was in-site upgraded in a fixed-bed reactor over char and activated carbon (AC) catalysts, and the effects of catalysts and temperature on tar upgrading were examined. The content of light tar with boiling point below 360°C was improved over the catalysts despite the decrease of total tar yield. Compared with char catalyst, AC exhibited better upgrading performances, and the content of light tar increased with the temperature. The light tar yield over AC catalyst increased by 18% compared with that without catalysts at 650°C. The variation in coal tar fractions suggested that upgrading is mainly from the conversion of the heavy components (pitch) in tar into light tar and gases. The role of carbon-based catalyst in upgrading process was also explored through the characterization by TG-DTG, FT-IR, N2 adsorption and Raman spectroscopy. Compared with thermal cracking, adsorption on the catalysts and the minerals in char, high specific surface areas and relative more defects in the carbon catalysts seem to be the primary factor for upgrading tar. •Coal pyrolysis tar was in-site upgraded over char and activated carbon catalysts.•Content and yield of light tar was greatly increased by activated carbon catalyst.•Activated carbon catalyst exhibits better upgrading tar than coal char.•Carbon catalysts with high surface area are preferable for upgrading coal tar.
Coal pyrolysis tar was in-site upgraded in a fixed-bed reactor over char and activated carbon (AC) catalysts, and the effects of catalysts and temperature on tar upgrading were examined. The content of light tar with boiling point below 360°C was improved over the catalysts despite the decrease of total tar yield. Compared with char catalyst, AC exhibited better upgrading performances, and the content of light tar increased with the temperature. The light tar yield over AC catalyst increased by 18% compared with that without catalysts at 650°C. The variation in coal tar fractions suggested that upgrading is mainly from the conversion of the heavy components (pitch) in tar into light tar and gases. The role of carbon-based catalyst in upgrading process was also explored through the characterization by TG-DTG, FT-IR, N2 adsorption and Raman spectroscopy. Compared with thermal cracking, adsorption on the catalysts and the minerals in char, high specific surface areas and relative more defects in the carbon catalysts seem to be the primary factor for upgrading tar.
Author Jin, Lijun
Dong, Chan
Li, Yang
Hu, Haoquan
Li, Xian
Bai, Xiaoyu
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Keywords Upgrading
Coal tar
Char
Activated carbon
Coal pyrolysis
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Snippet Coal pyrolysis tar was in-site upgraded in a fixed-bed reactor over char and activated carbon (AC) catalysts, and the effects of catalysts and temperature on...
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StartPage 41
SubjectTerms Activated carbon
adsorption
boiling point
catalysts
Char
coal
Coal pyrolysis
Coal tar
differential thermal analysis
Fourier transform infrared spectroscopy
gases
minerals
pyrolysis
Raman spectroscopy
temperature
thermal cracking
thermogravimetry
Upgrading
Title In-situ catalytic upgrading of coal pyrolysis tar on carbon-based catalyst in a fixed-bed reactor
URI https://dx.doi.org/10.1016/j.fuproc.2015.12.028
https://www.proquest.com/docview/2131886465
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