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Elucidating the role of $$\mathrm{Fe}$$-$$\mathrm{Mo}$$ interactions in the metal oxide precursors for Fe promoted $$\mathrm{Mo/ZSM}$$-5 catalysts in non-oxidative methane dehydroaromatization
Abstract
Literature shows that adding Fe as a separate phase to MoO3/ZSM-5 catalysts can improve benzene selectivity in methane dehydroaromatization (MDA), but only when added in small quantities, making it difficult to characterize the state of Fe in the catalyst and understand the role of Fe-Mo interactions on the catalytic properties. We explore how the nature of the Mo-Fe interactions in the catalyst precursor can influence the stability and product selectivity in MDA, by employing for the first time Fe2(MoO4)3/ZSM-5 as a catalyst precursor in MDA. We have compared the activity of Fe2(MoO4)3/ZSM-5 with monometallic MoO3/ZSM-5 and mixed MoO3 + Fe2O3/ZSM-5 containing equivalent Mo and Fe loadings and found that Fe2(MoO4)3/ZSM-5 shows higher benzene selectivity than the mixed MoO3 + Fe2O3/ZSM-5 catalyst and exhibits higher stability in reaction compared to the monometallic MoO3/ZSM-5 catalyst. Structural characterization suggests that Fe2(MoO4)3 partially segregates to Fe2O3 and amorphous MoOx during thermal pretreatment. The MoOx species migrate into the zeolite channels during pretreatment, while Fe oxides remain on the external surface of the zeolite. Gas adsorption/desorption techniques and density functional theory calculations demonstrate that the preexisting Fe2O3 phases on the external surface of the zeolite in the mixed MoO3 + Fe2O3/ZSM-5 precursor trap (MoO3)3 clustersmore »
- Authors:
-
- Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
- Texas Tech University, Lubbock, TX (United States); Lydian Labs Inc., Cambridge, MA (United States)
- Texas Tech University, Lubbock, TX (United States); Intel Co, Hillsboro, OR (United States)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
- Texas Tech University, Lubbock, TX (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 2311851
- Alternate Identifier(s):
- OSTI ID: 2007084; OSTI ID: 2318711
- Grant/Contract Number:
- AC02-76SF00515; SC0019074; EE0009412; SC0023323
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemical Engineering Journal
- Additional Journal Information:
- Journal Volume: 475; Journal ID: ISSN 1385-8947
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; methane dehydroaromatization; bimetallic catalyst; Fe2(MoO4)3; ZSM-5; benzene; methane valorization
Citation Formats
Hossain, Md Sifat, Dhillon, Gagandeep Singh, Liu, Liping, Sridhar, Apoorva, Hiennadi, Emanuele J., Hong, Jiyun, Bare, Simon R., Xin, Hongliang, Ericson, Thomas, Cozzolino, Anthony, and Khatib, Sheima J. Elucidating the role of $\mathrm{Fe}$-$\mathrm{Mo}$ interactions in the metal oxide precursors for Fe promoted $\mathrm{Mo/ZSM}$-5 catalysts in non-oxidative methane dehydroaromatization. United States: N. p., 2023.
Web. doi:10.1016/j.cej.2023.146096.
Hossain, Md Sifat, Dhillon, Gagandeep Singh, Liu, Liping, Sridhar, Apoorva, Hiennadi, Emanuele J., Hong, Jiyun, Bare, Simon R., Xin, Hongliang, Ericson, Thomas, Cozzolino, Anthony, & Khatib, Sheima J. Elucidating the role of $\mathrm{Fe}$-$\mathrm{Mo}$ interactions in the metal oxide precursors for Fe promoted $\mathrm{Mo/ZSM}$-5 catalysts in non-oxidative methane dehydroaromatization. United States. https://doi.org/10.1016/j.cej.2023.146096
Hossain, Md Sifat, Dhillon, Gagandeep Singh, Liu, Liping, Sridhar, Apoorva, Hiennadi, Emanuele J., Hong, Jiyun, Bare, Simon R., Xin, Hongliang, Ericson, Thomas, Cozzolino, Anthony, and Khatib, Sheima J. Wed .
"Elucidating the role of $\mathrm{Fe}$-$\mathrm{Mo}$ interactions in the metal oxide precursors for Fe promoted $\mathrm{Mo/ZSM}$-5 catalysts in non-oxidative methane dehydroaromatization". United States. https://doi.org/10.1016/j.cej.2023.146096.
@article{osti_2311851,
title = {Elucidating the role of $\mathrm{Fe}$-$\mathrm{Mo}$ interactions in the metal oxide precursors for Fe promoted $\mathrm{Mo/ZSM}$-5 catalysts in non-oxidative methane dehydroaromatization},
author = {Hossain, Md Sifat and Dhillon, Gagandeep Singh and Liu, Liping and Sridhar, Apoorva and Hiennadi, Emanuele J. and Hong, Jiyun and Bare, Simon R. and Xin, Hongliang and Ericson, Thomas and Cozzolino, Anthony and Khatib, Sheima J.},
abstractNote = {Literature shows that adding Fe as a separate phase to MoO3/ZSM-5 catalysts can improve benzene selectivity in methane dehydroaromatization (MDA), but only when added in small quantities, making it difficult to characterize the state of Fe in the catalyst and understand the role of Fe-Mo interactions on the catalytic properties. We explore how the nature of the Mo-Fe interactions in the catalyst precursor can influence the stability and product selectivity in MDA, by employing for the first time Fe2(MoO4)3/ZSM-5 as a catalyst precursor in MDA. We have compared the activity of Fe2(MoO4)3/ZSM-5 with monometallic MoO3/ZSM-5 and mixed MoO3 + Fe2O3/ZSM-5 containing equivalent Mo and Fe loadings and found that Fe2(MoO4)3/ZSM-5 shows higher benzene selectivity than the mixed MoO3 + Fe2O3/ZSM-5 catalyst and exhibits higher stability in reaction compared to the monometallic MoO3/ZSM-5 catalyst. Structural characterization suggests that Fe2(MoO4)3 partially segregates to Fe2O3 and amorphous MoOx during thermal pretreatment. The MoOx species migrate into the zeolite channels during pretreatment, while Fe oxides remain on the external surface of the zeolite. Gas adsorption/desorption techniques and density functional theory calculations demonstrate that the preexisting Fe2O3 phases on the external surface of the zeolite in the mixed MoO3 + Fe2O3/ZSM-5 precursor trap (MoO3)3 clusters preventing them from migrating into the zeolite channels during pretreatment, whereas gradual formation of amorphous MoOx together with the segregation of the Fe2O3 phase when using the Fe2(MoO4)3 precursor diminishes trapping of (MoO3)3 and consequently enhances migration and anchoring of the MoOx species in the zeolite channels, boosting selectivity to benzene. Characterization of used catalysts suggests that the presence of Fe promotes formation of structured carbon nanofibers which reduce the rate of catalyst deactivation.},
doi = {10.1016/j.cej.2023.146096},
journal = {Chemical Engineering Journal},
number = ,
volume = 475,
place = {United States},
year = {Wed Sep 20 00:00:00 EDT 2023},
month = {Wed Sep 20 00:00:00 EDT 2023}
}
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