Bimetallic Mo-Co/ZSM-5 and Mo-Ni/ZSM-5 catalysts for methane dehydroaromatization: A study of the effect of pretreatment and metal loadings on the catalytic behavior
Abstract
Here, methane dehydroaromatization is studied using different loadings (0.2 wt%, 0.6 and 1 wt%) of Co and Ni additives on a 6 wt% Mo/ZSM-5 catalyst to evaluate the promoting effect of Ni and Co on reactivity and stability of the catalysts. A synergy between Mo and the additives is observed when combining a reduction/carburization pretreatment with an optimum additive loading: benzene yield and catalytic stability are both improved. The fresh and spent samples were characterized by X-Ray Diffraction, 27Al Magic-Angle Spinning Solid State Nuclear Magnetic Resonance Spectroscopy, Temperature-Programmed Reduction and Thermogravimetric Analysis. The results suggest that catalytic enhancement in precarburized Mo-Co and Mo-Ni samples is due to a combination of effects: extraction of Al from the ZSM-5 framework to form inactive Al2(MoO4)3 is reduced, interaction of Mo with the additives enhances the retention of Mo species within the zeolite channels, prevents Mo aggregation in reaction and modifies the reducibility of the Mo sites.
- Authors:
-
- Texas Tech Univ., Lubbock, TX (United States)
- Univ. of Malaga (Spain)
- Publication Date:
- Research Org.:
- Texas Tech Univ., Lubbock, TX (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1803547
- Alternate Identifier(s):
- OSTI ID: 1573860
- Grant/Contract Number:
- SC0019074
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Catalysis. A, General
- Additional Journal Information:
- Journal Volume: 589; Journal ID: ISSN 0926-860X
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; methane dehydroaromatization; benzene; 6 wt% Mo/HZSM-5; Co-modified Mo catalysts; regeneration
Citation Formats
Sridhar, Apoorva, Rahman, Mustafizur, Infantes-Molina, Antonia, Wylie, Benjamin J., Borcik, Collin G., and Khatib, Sheima J. Bimetallic Mo-Co/ZSM-5 and Mo-Ni/ZSM-5 catalysts for methane dehydroaromatization: A study of the effect of pretreatment and metal loadings on the catalytic behavior. United States: N. p., 2019.
Web. doi:10.1016/j.apcata.2019.117247.
Sridhar, Apoorva, Rahman, Mustafizur, Infantes-Molina, Antonia, Wylie, Benjamin J., Borcik, Collin G., & Khatib, Sheima J. Bimetallic Mo-Co/ZSM-5 and Mo-Ni/ZSM-5 catalysts for methane dehydroaromatization: A study of the effect of pretreatment and metal loadings on the catalytic behavior. United States. https://doi.org/10.1016/j.apcata.2019.117247
Sridhar, Apoorva, Rahman, Mustafizur, Infantes-Molina, Antonia, Wylie, Benjamin J., Borcik, Collin G., and Khatib, Sheima J. Tue .
"Bimetallic Mo-Co/ZSM-5 and Mo-Ni/ZSM-5 catalysts for methane dehydroaromatization: A study of the effect of pretreatment and metal loadings on the catalytic behavior". United States. https://doi.org/10.1016/j.apcata.2019.117247. https://www.osti.gov/servlets/purl/1803547.
@article{osti_1803547,
title = {Bimetallic Mo-Co/ZSM-5 and Mo-Ni/ZSM-5 catalysts for methane dehydroaromatization: A study of the effect of pretreatment and metal loadings on the catalytic behavior},
author = {Sridhar, Apoorva and Rahman, Mustafizur and Infantes-Molina, Antonia and Wylie, Benjamin J. and Borcik, Collin G. and Khatib, Sheima J.},
abstractNote = {Here, methane dehydroaromatization is studied using different loadings (0.2 wt%, 0.6 and 1 wt%) of Co and Ni additives on a 6 wt% Mo/ZSM-5 catalyst to evaluate the promoting effect of Ni and Co on reactivity and stability of the catalysts. A synergy between Mo and the additives is observed when combining a reduction/carburization pretreatment with an optimum additive loading: benzene yield and catalytic stability are both improved. The fresh and spent samples were characterized by X-Ray Diffraction, 27Al Magic-Angle Spinning Solid State Nuclear Magnetic Resonance Spectroscopy, Temperature-Programmed Reduction and Thermogravimetric Analysis. The results suggest that catalytic enhancement in precarburized Mo-Co and Mo-Ni samples is due to a combination of effects: extraction of Al from the ZSM-5 framework to form inactive Al2(MoO4)3 is reduced, interaction of Mo with the additives enhances the retention of Mo species within the zeolite channels, prevents Mo aggregation in reaction and modifies the reducibility of the Mo sites.},
doi = {10.1016/j.apcata.2019.117247},
journal = {Applied Catalysis. A, General},
number = ,
volume = 589,
place = {United States},
year = {Tue Oct 22 00:00:00 EDT 2019},
month = {Tue Oct 22 00:00:00 EDT 2019}
}
Web of Science
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