Enhanced Hydrodeoxygenation of m -Cresol over Bimetallic Pt–Mo Catalysts through an Oxophilic Metal-Induced Tautomerization Pathway
Abstract
Supported bimetallic catalysts consisting of a noble metal (e.g., Pt) and an oxophilic metal (e.g., Mo) have received considerable attention for the hydrodeoxygenation of oxygenated aromatic compounds produced from biomass fast pyrolysis. Here, we report that PtMo can catalyze m-cresol deoxygenation via a pathway involving an initial tautomerization step. In contrast, the dominant mechanism on monometallic Pt/Al2O3 was found to be sequential Pt-catalyzed ring hydrogenation followed by dehydration on the support. Bimetallic Pt10Mo1 and Pt1Mo1 catalysts were found to produce the completely hydrogenated and deoxygenated product, methylcyclohexane (MCH), with much higher yields than monometallic Pt catalysts with comparable metal loadings and surface areas. Over an inert carbon support, MCH formation was found to be slow over monometallic Pt catalysts, while deoxygenation was significant for PtMo catalysts even in the absence of an acidic support material. Experimental studies of m-cresol deoxygenation together with density functional theory calculations indicated that Mo sites on the PtMo bimetallic surface dramatically lower the barrier for m-cresol tautomerization and subsequent deoxygenation. The accessibility of this pathway arises from the increased interaction between the oxygen of m-cresol and the Mo sites in the Pt surface. This interaction significantly alters the configuration of the precursor and transition statesmore »
- Authors:
-
- Univ. of Colorado, Boulder, CO (United States). Chemical and Biological Engineering Dept.
- National Renewable Energy Lab. (NREL), Golden, CO (United States). National Bioenergy Center
- Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office; National Science Foundation (NSF); Department of Education (DOE'd)
- OSTI Identifier:
- 1271939
- Report Number(s):
- NREL/JA-5100-66831
Journal ID: ISSN 2155-5435
- Grant/Contract Number:
- AC36-08GO28308; MCB-090159; CHE-1149752; AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Catalysis
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 7; Journal ID: ISSN 2155-5435
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 09 BIOMASS FUELS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; bimetallic; biomass; catalytic fast pyrolysis; hydrodeoxygenation; molybdenum; oxophilic promoter; platinum
Citation Formats
Robinson, Allison, Ferguson, Glen Allen, Gallagher, James R., Cheah, Singfoong, Beckham, Gregg T., Schaidle, Joshua A., Hensley, Jesse E., and Medlin, J. Will. Enhanced Hydrodeoxygenation of m -Cresol over Bimetallic Pt–Mo Catalysts through an Oxophilic Metal-Induced Tautomerization Pathway. United States: N. p., 2016.
Web. doi:10.1021/acscatal.6b01131.
Robinson, Allison, Ferguson, Glen Allen, Gallagher, James R., Cheah, Singfoong, Beckham, Gregg T., Schaidle, Joshua A., Hensley, Jesse E., & Medlin, J. Will. Enhanced Hydrodeoxygenation of m -Cresol over Bimetallic Pt–Mo Catalysts through an Oxophilic Metal-Induced Tautomerization Pathway. United States. https://doi.org/10.1021/acscatal.6b01131
Robinson, Allison, Ferguson, Glen Allen, Gallagher, James R., Cheah, Singfoong, Beckham, Gregg T., Schaidle, Joshua A., Hensley, Jesse E., and Medlin, J. Will. Thu .
"Enhanced Hydrodeoxygenation of m -Cresol over Bimetallic Pt–Mo Catalysts through an Oxophilic Metal-Induced Tautomerization Pathway". United States. https://doi.org/10.1021/acscatal.6b01131. https://www.osti.gov/servlets/purl/1271939.
@article{osti_1271939,
title = {Enhanced Hydrodeoxygenation of m -Cresol over Bimetallic Pt–Mo Catalysts through an Oxophilic Metal-Induced Tautomerization Pathway},
author = {Robinson, Allison and Ferguson, Glen Allen and Gallagher, James R. and Cheah, Singfoong and Beckham, Gregg T. and Schaidle, Joshua A. and Hensley, Jesse E. and Medlin, J. Will},
abstractNote = {Supported bimetallic catalysts consisting of a noble metal (e.g., Pt) and an oxophilic metal (e.g., Mo) have received considerable attention for the hydrodeoxygenation of oxygenated aromatic compounds produced from biomass fast pyrolysis. Here, we report that PtMo can catalyze m-cresol deoxygenation via a pathway involving an initial tautomerization step. In contrast, the dominant mechanism on monometallic Pt/Al2O3 was found to be sequential Pt-catalyzed ring hydrogenation followed by dehydration on the support. Bimetallic Pt10Mo1 and Pt1Mo1 catalysts were found to produce the completely hydrogenated and deoxygenated product, methylcyclohexane (MCH), with much higher yields than monometallic Pt catalysts with comparable metal loadings and surface areas. Over an inert carbon support, MCH formation was found to be slow over monometallic Pt catalysts, while deoxygenation was significant for PtMo catalysts even in the absence of an acidic support material. Experimental studies of m-cresol deoxygenation together with density functional theory calculations indicated that Mo sites on the PtMo bimetallic surface dramatically lower the barrier for m-cresol tautomerization and subsequent deoxygenation. The accessibility of this pathway arises from the increased interaction between the oxygen of m-cresol and the Mo sites in the Pt surface. This interaction significantly alters the configuration of the precursor and transition states for tautomerization. Lastly, a suite of catalyst characterization techniques including X-ray absorption spectroscopy (XAS) and temperature-programmed reduction (TPR) indicate that Mo was present in a reduced state on the bimetallic surface under conditions relevant for reaction. Overall, these results suggest that the use of bifunctional metal catalysts can result in new reaction pathways that are unfavorable on monometallic noble metal catalysts.},
doi = {10.1021/acscatal.6b01131},
journal = {ACS Catalysis},
number = 7,
volume = 6,
place = {United States},
year = {Thu May 26 00:00:00 EDT 2016},
month = {Thu May 26 00:00:00 EDT 2016}
}
Web of Science
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