TY - JOUR
T1 - Impact of microporous zeolite-coated macroporous supports on the catalytic pyrolysis of methylcyclohexane under supercritical conditions
AU - Magnone, Edoardo
AU - Shin, Min Chang
AU - Park, Jung Hoon
N1 - Publisher Copyright:
© 2024 Elsevier Inc.
PY - 2024/5/15
Y1 - 2024/5/15
N2 - Under supercritical conditions, the effects of the microporous zeolite-coated macroporous supports (i.e., ceramic-supported ZSM-5 catalysts and metal-supported ZSM-5 catalysts) on the endothermic pyrolysis process of methylcyclohexane (MCH, CH3C6H11) were examined. The micro-macroporous composite materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and NH3 temperature-programmed desorption (NH3-TPD) analysis. ZSM-5-coated Al2O3 hollow fiber and ZSM-5-coated NiCrFeAl metal foam were both tested using an isothermal constant-pressure continuous-flow heterogeneous catalytic reactor at high temperature (550 °C) and pressure (50 bar) that simulate supersonic jet engines. The MCH pyrolysis conversions and post-pyrolysis products were determined by gas chromatography, while the deposited coke on the microporous zeolite catalysts was quantified using thermogravimetric (TG) analysis. ZSM-5-coated NiCrFeAl metal foam catalyst showed a slightly higher MCH pyrolysis conversion (%) than ZSM-5-coated Al2O3 hollow fiber catalyst. On the other hand, the ZSM-5-coated Al2O3 hollow fiber produces fewer aromatic hydrocarbons (benzene, toluene, and xylene, BTX), as well as cyclic or polycyclic hydrocarbons (naphthalene). Additionally, the coke deposition was approximately 2 times lower on the ZSM-5-coated Al2O3 hollow fiber catalyst compared to the ZSM-5-coated NiCrFeAl metal foam. Furthermore, due to the endothermic nature of the catalytic pyrolysis of MCH under supercritical jet conditions over the studied microporous zeolite-coated macroporous supports, a temperature decrease of approximately 15–20 °C was observed.
AB - Under supercritical conditions, the effects of the microporous zeolite-coated macroporous supports (i.e., ceramic-supported ZSM-5 catalysts and metal-supported ZSM-5 catalysts) on the endothermic pyrolysis process of methylcyclohexane (MCH, CH3C6H11) were examined. The micro-macroporous composite materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and NH3 temperature-programmed desorption (NH3-TPD) analysis. ZSM-5-coated Al2O3 hollow fiber and ZSM-5-coated NiCrFeAl metal foam were both tested using an isothermal constant-pressure continuous-flow heterogeneous catalytic reactor at high temperature (550 °C) and pressure (50 bar) that simulate supersonic jet engines. The MCH pyrolysis conversions and post-pyrolysis products were determined by gas chromatography, while the deposited coke on the microporous zeolite catalysts was quantified using thermogravimetric (TG) analysis. ZSM-5-coated NiCrFeAl metal foam catalyst showed a slightly higher MCH pyrolysis conversion (%) than ZSM-5-coated Al2O3 hollow fiber catalyst. On the other hand, the ZSM-5-coated Al2O3 hollow fiber produces fewer aromatic hydrocarbons (benzene, toluene, and xylene, BTX), as well as cyclic or polycyclic hydrocarbons (naphthalene). Additionally, the coke deposition was approximately 2 times lower on the ZSM-5-coated Al2O3 hollow fiber catalyst compared to the ZSM-5-coated NiCrFeAl metal foam. Furthermore, due to the endothermic nature of the catalytic pyrolysis of MCH under supercritical jet conditions over the studied microporous zeolite-coated macroporous supports, a temperature decrease of approximately 15–20 °C was observed.
KW - Coke formation
KW - Endothermic catalytic pyrolysis
KW - Heterogeneous catalysis
KW - Macroporous supports
KW - Microporous ZSM-5 zeolite catalyst
UR - http://www.scopus.com/inward/record.url?scp=85188530923&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2024.113091
DO - 10.1016/j.micromeso.2024.113091
M3 - Article
AN - SCOPUS:85188530923
SN - 1387-1811
VL - 372
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
M1 - 113091
ER -