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

Formation of (Rh–Fe)–FeOx Complex Sites Enables Methanol Synthesis from CO2

Journal Article · · ACS Catalysis
Here, we addressed the challenges of designing catalysts for selective CO2 hydrogenation by incorporating oxide Fe species onto Rh nanoparticles. Nanoscopic FeOx domains created a “reverse catalyst” structure (i.e., a metal oxide supported on a metal) that increased the density of interfacial sites compared to traditional supported catalysts. The contact between the metal nanoparticle and the oxide overlayer induced the formation of a surface Rh-Fe alloy that stabilize methoxy groups while suppressing hydrogenolysis to methane. Sites at FeOx-metal interfaces interact with CO2 sevenfold stronger than sites on metal surfaces, show larger energy barriers to cleave the C-O bonds, and offer a barrierless pathway for hydrogenation of methoxy species to methanol. Consequently, the multifunctional sites over FeOx/Rh-Fe catalysts highlight and meet the requirements of a selective methanol catalyst: strong interaction with CO2 to ensure high density of transition states; metal sites to activate and make hydrogen available to surface intermediates; and high energy barriers for C-O bond cleavage to form carbides. These synthesis and catalytic chemistries, demonstrated for Rh-Fe-FeOx interfaces, enable us to overcome the limitations to the design of methanol production catalysts.
Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357; AC05-76RL01830
OSTI ID:
2407052
Report Number(s):
PNNL-SA--199381
Journal Information:
ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 13 Vol. 14; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

References (27)

Conversion of Methanol to Hydrocarbons: How Zeolite Cavity and Pore Size Controls Product Selectivity journal April 2012
CO 2 Hydrogenation over Oxide-Supported PtCo Catalysts: The Role of the Oxide Support in Determining the Product Selectivity journal May 2016
CO 2 -to-Methanol Hydrogenation on Zirconia-Supported Copper Nanoparticles: Reaction Intermediates and the Role of the Metal-Support Interface journal January 2017
CO2 hydrogenation to ethanol over promoted Rh/SiO2 catalysts journal May 1996
CO2 hydrogenation at low temperature over Rh/γ-Al2O3 catalysts: Effect of the metal particle size on catalytic performances and reaction mechanism journal February 2012
Product distribution of CO 2 hydrogenation by K- and Mn-promoted Fe catalysts supported on N -functionalized carbon nanotubes journal October 2016
Identification of surface intermediates during ethylidyne formation on Pt(111) by calculation of infrared intensities and deuterium isotope shifts journal October 2015
Adsorption and Hydrogenation of CO 2 on Rh Nanosized Crystals: Demonstration of the Role of Interfacet Oxygen Spillover and Comparative Studies with O 2 , N 2 O, and CO journal July 2017
Theoretical Investigation of CO 2 Adsorption and Dissociation on Low Index Surfaces of Transition Metals journal March 2018
The Effect of Charge on CO Binding in Rhodium Carbonyls:  From Bridging to Terminal CO journal February 2008
Isolated Metal Active Site Concentration and Stability Control Catalytic CO 2 Reduction Selectivity journal February 2015
Mechanism of Ethanol Synthesis from Syngas on Rh(111) journal September 2009
Environment of Metal–O–Fe Bonds Enabling High Activity in CO 2 Reduction on Single Metal Atoms and on Supported Nanoparticles journal April 2021
Hydrogen Transfer Pathways during Zeolite Catalyzed Methanol Conversion to Hydrocarbons journal November 2016
Tuning Selectivity of CO 2 Hydrogenation Reactions at the Metal/Oxide Interface journal July 2017
Size and Charge Effects on the Binding of CO to Small Isolated Rhodium Clusters journal September 2004
Factors Controlling the Interaction of CO 2 with Transition Metal Surfaces journal November 2007
Discovery of a Ni-Ga catalyst for carbon dioxide reduction to methanol journal March 2014
High-performance hybrid oxide catalyst of manganese and cobalt for low-pressure methanol synthesis journal March 2015
Inverse iron oxide/metal catalysts from galvanic replacement journal June 2020
How Rh surface breaks CO2 molecules under ambient pressure journal November 2020
Copper-zirconia interfaces in UiO-66 enable selective catalytic hydrogenation of CO2 to methanol journal November 2020
Recent trends and fundamental insights in the methanol-to-hydrocarbons process journal June 2018
Carboxyl intermediate formation via an in situ-generated metastable active site during water-gas shift catalysis journal September 2019
Following the structure of copper-zinc-alumina across the pressure gap in carbon dioxide hydrogenation journal June 2021
Hydroxyl-mediated ethanol selectivity of CO 2 hydrogenation journal January 2019
A highly selective and stable ZnO-ZrO 2 solid solution catalyst for CO 2 hydrogenation to methanol journal October 2017

Similar Records

Deep Understanding of Strong Metal Interface Confinement: A Journey of Pd/FeOx Catalysts
Journal Article · Thu Jul 16 20:00:00 EDT 2020 · ACS Catalysis · OSTI ID:1810000

Inverse iron oxide/metal catalysts from galvanic replacement
Journal Article · Sun Jun 28 20:00:00 EDT 2020 · Nature Communications · OSTI ID:1638918

Understanding Methanol Synthesis on Inverse ZnO/CuOx/Cu Catalysts: Stability of CH3O Species and Dynamic Nature of the Surface
Journal Article · Thu Mar 18 20:00:00 EDT 2021 · Journal of Physical Chemistry. C · OSTI ID:1785112