Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Enhanced Hydrodeoxygenation of m -Cresol over Bimetallic Pt–Mo Catalysts through an Oxophilic Metal-Induced Tautomerization Pathway

Journal Article · · ACS Catalysis
 [1];  [2];  [3];  [2];  [2];  [2];  [2];  [1]
  1. Univ. of Colorado, Boulder, CO (United States). Chemical and Biological Engineering Dept.
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States). National Bioenergy Center
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
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.
Research Organization:
NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
Sponsoring Organization:
Department of Education (DOE'd); National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
Grant/Contract Number:
AC02-06CH11357; AC36-08GO28308
OSTI ID:
1271939
Report Number(s):
NREL/JA--5100-66831
Journal Information:
ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 7 Vol. 6; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (88)

Highly Selective Catalytic Conversion of Phenolic Bio-Oil to Alkanes journal May 2009
Size-Dependent Oxidation Mechanism of Supported Pd Nanoparticles journal May 2006
X-ray Absorption Spectroscopy of Bimetallic Pt-Re Catalysts for Hydrogenolysis of Glycerol to Propanediols journal July 2010
H2-Induced Reconstruction of Supported Pt Clusters: Metal-Support Interaction versus Surface Hydride journal December 2010
Aqueous Phase Glycerol Reforming by PtMo Bimetallic Nano-Particle Catalyst: Product Selectivity and Structural Characterization journal February 2012
The Synergy of the Support Acid Function and the Metal Function in the Catalytic Hydrodeoxygenation of m-Cresol journal March 2012
Aqueous-Phase Processing of Bio-oil Model Compounds Over Pt–Re Supported on Carbon journal March 2012
Aqueous Phase Glycerol Reforming with Pt and PtMo Bimetallic Nanoparticle Catalysts: The Role of the Mo Promoter journal July 2013
Conceptual Process Design and Techno-Economic Assessment of Ex Situ Catalytic Fast Pyrolysis of Biomass: A Fixed Bed Reactor Implementation Scenario for Future Feasibility journal October 2015
Relations between the structures of phases in the system platinum-molybdenum journal June 1964
Phase equilibria and superconductivity in the molybdenum-platinum system journal June 1968
Chemisorption of CO on the Pt(111) surface journal May 1977
Effects of adsorbed carbon and oxygen on the chemisorption of H2 and Co on Mo(100) journal August 1981
Hydrogenation of phenol over supported platinum and palladium catalysts journal March 1993
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Platinum-oxide species formed by oxidation of platinum crystallites supported on alumina journal October 1996
Oxygen electrocatalysis on thin porous coating rotating platinum electrodes journal December 1998
Hydro-dehydrogenation of six-member hydrocarbon cycles on supported platinum–cobalt bimetallic catalysts journal April 2002
Platinum catalysts supported on carbon blacks with different surface chemical properties journal October 1998
Catalytic hydrodeoxygenation journal June 2000
Characterization of biomass-based flash pyrolysis oils journal March 1998
Molybdenum oxide modified HZSM-5 catalyst: Surface acidity and catalytic performance for the dehydration of aqueous ethanol journal April 2011
Hydrodeoxygenation of m-cresol with Pt supported over mild acid materials journal July 2014
Effect of ceria nanoparticles into the Pt/C catalyst as cathode material on the electrocatalytic activity and durability for low-temperature fuel cell journal February 2010
Hydrodeoxygenation of guaiacol with CoMo catalysts. Part I: Promoting effect of cobalt on HDO selectivity and activity journal January 2011
Effect of molybdenum addition on supported platinum catalysts for the water–gas shift reaction journal August 2012
Evaluating strategies for catalytic upgrading of pyrolysis oil in liquid phase journal February 2014
Review of fast pyrolysis of biomass and product upgrading journal March 2012
A review of catalytic hydrodeoxygenation of lignin-derived phenols from biomass pyrolysis journal November 2012
Near-surface alloys for hydrogen fuel cell applications journal January 2006
Deoxygenation of m-cresol on Pt/γ-Al2O3 catalysts journal September 2013
Overview of fuel properties of biomass fast pyrolysis oils journal May 2009
A comparative study of straw, perennial grasses and hardwoods in terms of fast pyrolysis products journal June 2013
The effect of gold particle size on AuAu bond length and reactivity toward oxygen in supported catalysts journal June 2006
Gas-phase conversion of glycerol to synthesis gas over carbon-supported platinum and platinum–rhenium catalysts journal April 2007
The role of rhenium in the conversion of glycerol to synthesis gas over carbon supported platinum–rhenium catalysts journal November 2008
Correlation of Pt–Re surface properties with reaction pathways for the aqueous-phase reforming of glycerol journal March 2012
Carbon-supported bimetallic Pd–Fe catalysts for vapor-phase hydrodeoxygenation of guaiacol journal October 2013
Kinetics and mechanism of m-cresol hydrodeoxygenation on a Pt/SiO2 catalyst journal August 2014
Selective conversion of m-cresol to toluene over bimetallic Ni–Fe catalysts journal July 2014
A review of catalytic hydrogen production processes from biomass journal January 2010
Surface-level mechanistic studies of adsorbate–adsorbate interactions in heterogeneous catalysis by metals journal May 2011
Different Product Distributions and Mechanistic Aspects of the Hydrodeoxygenation of m-Cresol over Platinum and Ruthenium Catalysts journal September 2015
Role of the Support and Reaction Conditions on the Vapor-Phase Deoxygenation of m -Cresol over Pt/C and Pt/TiO 2 Catalysts journal March 2016
Surface Acidity and Photocatalytic Activity of TiO2, WO3/TiO2, and MoO3/TiO2 Photocatalysts journal April 1994
Enhanced Fe 2 O 3 Reducibility via Surface Modification with Pd: Characterizing the Synergy within Pd/Fe Catalysts for Hydrodeoxygenation Reactions journal September 2014
Synergistic Catalysis between Pd and Fe in Gas Phase Hydrodeoxygenation of m -Cresol journal August 2014
Phenol Deoxygenation Mechanisms on Fe(110) and Pd(111) journal December 2014
Coverage-Induced Conformational Effects on Activity and Selectivity: Hydrogenation and Decarbonylation of Furfural on Pd(111) journal November 2014
Theoretical Investigation of the Reaction Mechanism of the Guaiacol Hydrogenation over a Pt(111) Catalyst journal March 2015
Role of Dissociation of Phenol in Its Selective Hydrogenation on Pt(111) and Pd(111) journal February 2015
Catalytic Hydrodeoxygenation of Guaiacol on Rh-Based and Sulfided CoMo and NiMo Catalysts journal March 2011
Efficient Conversion of m -Cresol to Aromatics on a Bifunctional Pt/HBeta Catalyst journal June 2014
Pyrolysis of Wood and Bark in an Auger Reactor: Physical Properties and Chemical Analysis of the Produced Bio-oils journal January 2008
Gas-Phase Hydrogenation/Hydrogenolysis of Phenol over Supported Nickel Catalysts journal April 2000
An infrared spectroscopy and temperature-programmed desorption study of carbon monoxide on molybdena/alumina catalysts: quantitation of the molybdena overlayer journal January 1993
Theoretical x-ray absorption fine structure standards journal July 1991
Selective Hydrogenolysis of Polyols and Cyclic Ethers over Bifunctional Surface Sites on Rhodium–Rhenium Catalysts journal August 2011
First-Principles Study of Phenol Hydrogenation on Pt and Ni Catalysts in Aqueous Phase journal July 2014
Ethylene Hydrogenation on Pt(111) Monitored in Situ at High Pressures Using Sum Frequency Generation journal January 1996
The Importance of Transient States at Higher Coverages in Catalytic Reactions journal February 2000
Synthesis, Characterization, and Sulfur Tolerance of Pt−MoO x Catalysts Prepared from Pt−Mo Alloy Precursors journal October 2007
Adsorption Orientation-Induced Selectivity Control of Reactions of Benzyl Alcohol on Pd(111) journal June 2012
Interactions of Hydrogen, CO, Oxygen, and Water with Molybdenum-Modified Pt(111) journal December 2013
Hydrogen Adsorption Structures and Energetics on Iron Surfaces at High Coverage journal February 2014
Numerical Simulation of the Platinum LIII Edge White Line Relative to Nanometer Scale Clusters journal July 1997
Directing reaction pathways by catalyst active-site selection using self-assembled monolayers journal September 2013
Hydrodeoxygenation and coupling of aqueous phenolics over bifunctional zeolite-supported metal catalysts journal January 2010
Catalytic conversion of compounds representative of lignin-derived bio-oils: a reaction network for guaiacol, anisole, 4-methylanisole, and cyclohexanone conversion catalysed by Pt/γ-Al 2 O 3 journal January 2012
An introduction to X-ray absorption spectroscopy and its in situ application to organometallic compounds and homogeneous catalysts journal January 2012
Density functional theory simulations of complex catalytic materials in reactive environments: beyond the ideal surface at low coverage journal January 2014
Aqueous-phase hydrodeoxygenation of highly oxygenated aromatics on platinum journal January 2014
Recent advances in heterogeneous catalysts for bio-oil upgrading via “ex situ catalytic fast pyrolysis”: catalyst development through the study of model compounds journal January 2014
Bimetallic effects in the hydrodeoxygenation of meta-cresol on γ-Al2O3 supported Pt–Ni and Pt–Co catalysts journal January 2012
The relationship between structure and activity of MoO3–CeO2 catalysts for NO removal: influences of acidity and reducibility journal January 2013
The Difficult Chore of Measuring Coordination by EXAFS conference January 2007
Ab initiomolecular dynamics for liquid metals journal January 1993
Ab initio molecular-dynamics simulation of the liquid-metal–amorphous-semiconductor transition in germanium journal May 1994
Projector augmented-wave method journal December 1994
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Accurate Molecular Van Der Waals Interactions from Ground-State Electron Density and Free-Atom Reference Data journal February 2009
Accurate and Efficient Method for Many-Body van der Waals Interactions journal June 2012
ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT journal June 2005
WinXAS a Program for X-ray Absorption Spectroscopy Data Analysis under MS-Windows journal March 1998
KINETIC AND REACTIVE PROPERTIES OF ETHYLENE ON CLEAN AND HYDROGEN-COVERED Pd(111) journal December 2003
Promoting Effect of Re Addition to Rh/SiO 2 on Glycerol Hydrogenolysis journal June 2009
Process Design and Economics for the Conversion of Lignocellulosic Biomass to Hydrocarbon Fuels. Thermochemical Research Pathways with In Situ and Ex Situ Upgrading of Fast Pyrolysis Vapors report March 2015

Cited By (8)

Directing Reaction Pathways through Controlled Reactant Binding at Pd-TiO 2 Interfaces journal May 2017
Directing Reaction Pathways through Controlled Reactant Binding at Pd-TiO 2 Interfaces journal May 2017
Atmospheric hydrodeoxygenation of phenol as pyrolytic‐oil model compound for hydrocarbon production using Ag/TiO 2 catalyst journal February 2019
Exploring the Reaction Pathways of Bioglycerol Hydrodeoxygenation to Propene over Molybdena-Based Catalysts journal December 2017
Hydrodeoxygenation of guaiacol over bimetallic Fe-alloyed (Ni, Pt) surfaces: reaction mechanism, transition-state scaling relations and descriptor for predicting C–O bond scission reactivity journal January 2018
Mechanistic insights into hydrodeoxygenation of phenol on bimetallic phosphide catalysts journal January 2018
Role of tungsten modifiers in bimetallic catalysts for enhanced hydrodeoxygenation activity and selectivity journal January 2020
An Overview on Catalytic Hydrodeoxygenation of Pyrolysis Oil and Its Model Compounds journal June 2017