Abstract
In this study, a mechanism for coke formation of methylcyclohexane (MCH) was investigated by sampling products in a batch type reactor during thermal decomposition. Alkyl substituted C 5 ring hydrocarbons, which have a 5-member ring structure with alkyl groups as side chains, were the major products of thermal decomposition of MCH before coke formation (below 465 °C). The composition of alkyl substituted C 5 ring hydrocarbons gradually increased without any decrease during the reactions before coke formation. The composition of alkyl substituted C 5 ring hydrocarbons decreased after considerable increase, when coke formation occurred as 0.084 g coke/ml MCH for 10 h at 465 °C. Coke was formed via an increase in polycyclic aromatic hydrocarbons (PAHs). Based on this result, it was hypothesized that the abundance of alkyl substituted C 5 ring hydrocarbons caused the formation of PAHs and coke. To identify the role of alkyl substituted C 5 ring hydrocarbons on coke formation, thermal decomposition of MCH with 1,2,3,4-tetrahydroquinoline (THQ) was performed. THQ was used as the hydrogen donor, which inhibited coke formation. When coke formation was completely inhibited with 5.0 wt % THQ at 465 °C, the composition of all alkyl substituted C 5 ring hydrocarbons decreased compared to the experiment without THQ. In addition, PAHs were not completely formed throughout the reaction. These results demonstrated that an abundance of alkyl substituted C 5 ring hydrocarbons caused the formation of PAHs, which were precursors for coke under supercritical conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 5121-5134 |
| Number of pages | 14 |
| Journal | Energy and Fuels |
| Volume | 26 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2012 Aug 16 |
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ASJC Scopus subject areas
- Chemical Engineering(all)
- Energy Engineering and Power Technology
- Fuel Technology
Cite this
Coke formation during thermal decomposition of methylcyclohexane by alkyl substituted C 5 ring hydrocarbons under supercritical conditions. / Kim, Joongyeon; Park, Sun Hee; Lee, Chang Hun; Chun, Byung Hee; Han, Jeong Sik; Jeong, Byung Hun; Kim, Sung Hyun.
In: Energy and Fuels, Vol. 26, No. 8, 16.08.2012, p. 5121-5134.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Coke formation during thermal decomposition of methylcyclohexane by alkyl substituted C 5 ring hydrocarbons under supercritical conditions
AU - Kim, Joongyeon
AU - Park, Sun Hee
AU - Lee, Chang Hun
AU - Chun, Byung Hee
AU - Han, Jeong Sik
AU - Jeong, Byung Hun
AU - Kim, Sung Hyun
PY - 2012/8/16
Y1 - 2012/8/16
N2 - In this study, a mechanism for coke formation of methylcyclohexane (MCH) was investigated by sampling products in a batch type reactor during thermal decomposition. Alkyl substituted C 5 ring hydrocarbons, which have a 5-member ring structure with alkyl groups as side chains, were the major products of thermal decomposition of MCH before coke formation (below 465 °C). The composition of alkyl substituted C 5 ring hydrocarbons gradually increased without any decrease during the reactions before coke formation. The composition of alkyl substituted C 5 ring hydrocarbons decreased after considerable increase, when coke formation occurred as 0.084 g coke/ml MCH for 10 h at 465 °C. Coke was formed via an increase in polycyclic aromatic hydrocarbons (PAHs). Based on this result, it was hypothesized that the abundance of alkyl substituted C 5 ring hydrocarbons caused the formation of PAHs and coke. To identify the role of alkyl substituted C 5 ring hydrocarbons on coke formation, thermal decomposition of MCH with 1,2,3,4-tetrahydroquinoline (THQ) was performed. THQ was used as the hydrogen donor, which inhibited coke formation. When coke formation was completely inhibited with 5.0 wt % THQ at 465 °C, the composition of all alkyl substituted C 5 ring hydrocarbons decreased compared to the experiment without THQ. In addition, PAHs were not completely formed throughout the reaction. These results demonstrated that an abundance of alkyl substituted C 5 ring hydrocarbons caused the formation of PAHs, which were precursors for coke under supercritical conditions.
AB - In this study, a mechanism for coke formation of methylcyclohexane (MCH) was investigated by sampling products in a batch type reactor during thermal decomposition. Alkyl substituted C 5 ring hydrocarbons, which have a 5-member ring structure with alkyl groups as side chains, were the major products of thermal decomposition of MCH before coke formation (below 465 °C). The composition of alkyl substituted C 5 ring hydrocarbons gradually increased without any decrease during the reactions before coke formation. The composition of alkyl substituted C 5 ring hydrocarbons decreased after considerable increase, when coke formation occurred as 0.084 g coke/ml MCH for 10 h at 465 °C. Coke was formed via an increase in polycyclic aromatic hydrocarbons (PAHs). Based on this result, it was hypothesized that the abundance of alkyl substituted C 5 ring hydrocarbons caused the formation of PAHs and coke. To identify the role of alkyl substituted C 5 ring hydrocarbons on coke formation, thermal decomposition of MCH with 1,2,3,4-tetrahydroquinoline (THQ) was performed. THQ was used as the hydrogen donor, which inhibited coke formation. When coke formation was completely inhibited with 5.0 wt % THQ at 465 °C, the composition of all alkyl substituted C 5 ring hydrocarbons decreased compared to the experiment without THQ. In addition, PAHs were not completely formed throughout the reaction. These results demonstrated that an abundance of alkyl substituted C 5 ring hydrocarbons caused the formation of PAHs, which were precursors for coke under supercritical conditions.
UR - http://www.scopus.com/inward/record.url?scp=84865140565&partnerID=8YFLogxK
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U2 - 10.1021/ef3007678
DO - 10.1021/ef3007678
M3 - Article
AN - SCOPUS:84865140565
VL - 26
SP - 5121
EP - 5134
JO - Energy and Fuels
JF - Energy and Fuels
SN - 0887-0624
IS - 8
ER -