Details
| Original language | English |
|---|---|
| Pages (from-to) | 2448-2451 |
| Number of pages | 4 |
| Journal | ACS Catalysis |
| Volume | 6 |
| Issue number | 4 |
| Early online date | 10 Mar 2016 |
| Publication status | Published - 1 Apr 2016 |
Abstract
The performance of a dense ceramic hydrogen-permeable membrane reactor for the nonoxidative methane dehydroaromatization (MDA), according to the equilibrium reaction 6CH4 ⇄ C6H6 + 9H2 with a 6 wt % Mo/HZSM-5 bifunctional catalyst was investigated. A U-shaped ceramic hollow fiber membrane of the composition La5.5W0.6Mo0.4O11.25-δ (LWM0.4) has been used for the in situ removal of H2 to overcome thermodynamic constraints. The yield of aromatics (benzene, toluene, naphthalene) in the MDA could be increased in the beginning of the aromatization reaction by ∼50%-70%, in comparison with the fixed-bed reactor, because 40%-60% of the H2 abstracted have been extracted at 700 °C with a weight hourly space velocity (WHSV) of 840 cm3 gcat-1 h-1. These advantages of the membrane reactor operation decrease with time on stream, since the removal of H2 boosts not only CH4 conversion and yield of aromatics, but also catalyst deactivation by deposition of carbonaceous deposits. However, the catalyst system could be regenerated by burning the coke away with air.
Keywords
- catalyst regeneration, gas-to-liquids technologies, hollow fiber membrane, hydrogen-permeable ceramic membrane, natural gas conversion, nonoxidative methane dehydroaromatization
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
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In: ACS Catalysis, Vol. 6, No. 4, 01.04.2016, p. 2448-2451.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Gas to Liquids
T2 - Natural Gas Conversion to Aromatic Fuels and Chemicals in a Hydrogen-Permeable Ceramic Hollow Fiber Membrane Reactor
AU - Xue, Jian
AU - Chen, Yan
AU - Wei, Yanying
AU - Feldhoff, Armin
AU - Wang, Haihui
AU - Caro, Juergen
N1 - Funding Information: J.X. acknowledges financial support from the China Scholarship Council (CSC) (File No. 201306150011), National Science Fund for Distinguished Young Scholars of China (No. 21225625), Natural Science Foundation of China (No. 21536005) and the Australian Research Council (ARC) through the Future Fellow Program (No. FT140100757). Financial support by the Deutsche Forschungsgemeinschaft (DFG) (Nos. Ca 147/19-1 and FE928/7-1) is appreciated. Y.W. also thanks the Alexander von Humboldt Foundation. The authors also acknowledge Hongbin Chen for technical support. L. Mleczko and J. Assmann (Bayer Technology Services) are thanked for providing the Mo/HZSM-5 catalyst. Publisher Copyright: © 2016 American Chemical Society.
PY - 2016/4/1
Y1 - 2016/4/1
N2 - The performance of a dense ceramic hydrogen-permeable membrane reactor for the nonoxidative methane dehydroaromatization (MDA), according to the equilibrium reaction 6CH4 ⇄ C6H6 + 9H2 with a 6 wt % Mo/HZSM-5 bifunctional catalyst was investigated. A U-shaped ceramic hollow fiber membrane of the composition La5.5W0.6Mo0.4O11.25-δ (LWM0.4) has been used for the in situ removal of H2 to overcome thermodynamic constraints. The yield of aromatics (benzene, toluene, naphthalene) in the MDA could be increased in the beginning of the aromatization reaction by ∼50%-70%, in comparison with the fixed-bed reactor, because 40%-60% of the H2 abstracted have been extracted at 700 °C with a weight hourly space velocity (WHSV) of 840 cm3 gcat-1 h-1. These advantages of the membrane reactor operation decrease with time on stream, since the removal of H2 boosts not only CH4 conversion and yield of aromatics, but also catalyst deactivation by deposition of carbonaceous deposits. However, the catalyst system could be regenerated by burning the coke away with air.
AB - The performance of a dense ceramic hydrogen-permeable membrane reactor for the nonoxidative methane dehydroaromatization (MDA), according to the equilibrium reaction 6CH4 ⇄ C6H6 + 9H2 with a 6 wt % Mo/HZSM-5 bifunctional catalyst was investigated. A U-shaped ceramic hollow fiber membrane of the composition La5.5W0.6Mo0.4O11.25-δ (LWM0.4) has been used for the in situ removal of H2 to overcome thermodynamic constraints. The yield of aromatics (benzene, toluene, naphthalene) in the MDA could be increased in the beginning of the aromatization reaction by ∼50%-70%, in comparison with the fixed-bed reactor, because 40%-60% of the H2 abstracted have been extracted at 700 °C with a weight hourly space velocity (WHSV) of 840 cm3 gcat-1 h-1. These advantages of the membrane reactor operation decrease with time on stream, since the removal of H2 boosts not only CH4 conversion and yield of aromatics, but also catalyst deactivation by deposition of carbonaceous deposits. However, the catalyst system could be regenerated by burning the coke away with air.
KW - catalyst regeneration
KW - gas-to-liquids technologies
KW - hollow fiber membrane
KW - hydrogen-permeable ceramic membrane
KW - natural gas conversion
KW - nonoxidative methane dehydroaromatization
UR - http://www.scopus.com/inward/record.url?scp=84963545886&partnerID=8YFLogxK
U2 - 10.1021/acscatal.6b00004
DO - 10.1021/acscatal.6b00004
M3 - Article
AN - SCOPUS:84963545886
VL - 6
SP - 2448
EP - 2451
JO - ACS Catalysis
JF - ACS Catalysis
SN - 2155-5435
IS - 4
ER -